diff --git a/audio/7.0/IDevice.hal b/audio/7.0/IDevice.hal
index e30e545..e423f29 100644
--- a/audio/7.0/IDevice.hal
+++ b/audio/7.0/IDevice.hal
@@ -103,6 +103,11 @@
      * If the stream can not be opened with the proposed audio config,
      * HAL must provide suggested values for the audio config.
      *
+     * Note: INVALID_ARGUMENTS is returned both in the case when the
+     * HAL can not use the provided config and in the case when
+     * the value of any argument is invalid. In the latter case the
+     * HAL must provide a default initialized suggested config.
+     *
      * @param ioHandle handle assigned by AudioFlinger.
      * @param device device type and (if needed) address.
      * @param config stream configuration.
@@ -111,7 +116,8 @@
                              May be used by implementations to configure hardware effects.
      * @return retval operation completion status.
      * @return outStream created output stream.
-     * @return suggestedConfig in case of invalid parameters, suggested config.
+     * @return suggestedConfig in the case of rejection of the proposed config,
+     *                         a config suggested by the HAL.
      */
     openOutputStream(
             AudioIoHandle ioHandle,
@@ -128,6 +134,11 @@
      * If the stream can not be opened with the proposed audio config,
      * HAL must provide suggested values for the audio config.
      *
+     * Note: INVALID_ARGUMENTS is returned both in the case when the
+     * HAL can not use the provided config and in the case when
+     * the value of any argument is invalid. In the latter case the
+     * HAL must provide a default initialized suggested config.
+     *
      * @param ioHandle handle assigned by AudioFlinger.
      * @param device device type and (if needed) address.
      * @param config stream configuration.
@@ -136,7 +147,8 @@
      *                     May be used by implementations to configure processing effects.
      * @return retval operation completion status.
      * @return inStream in case of success, created input stream.
-     * @return suggestedConfig in case of invalid parameters, suggested config.
+     * @return suggestedConfig in the case of rejection of the proposed config,
+     *                         a config suggested by the HAL.
      */
     openInputStream(
             AudioIoHandle ioHandle,
@@ -162,6 +174,9 @@
      * Creates an audio patch between several source and sink ports.  The handle
      * is allocated by the HAL and must be unique for this audio HAL module.
      *
+     * Optional method. HAL must support it if 'supportsAudioPatches' returns
+     * 'true'.
+     *
      * @param sources patch sources.
      * @param sinks patch sinks.
      * @return retval operation completion status.
@@ -177,6 +192,9 @@
      * as the HAL module can figure out a way of switching the route without
      * causing audio disruption.
      *
+     * Optional method. HAL must support it if 'supportsAudioPatches' returns
+     * 'true'.
+     *
      * @param previousPatch handle of the previous patch to update.
      * @param sources new patch sources.
      * @param sinks new patch sinks.
@@ -192,6 +210,9 @@
     /**
      * Release an audio patch.
      *
+     * Optional method. HAL must support it if 'supportsAudioPatches' returns
+     * 'true'.
+     *
      * @param patch patch handle.
      * @return retval operation completion status.
      */
diff --git a/audio/7.0/IStreamIn.hal b/audio/7.0/IStreamIn.hal
index 0a3f24b..bf9ae52 100644
--- a/audio/7.0/IStreamIn.hal
+++ b/audio/7.0/IStreamIn.hal
@@ -41,6 +41,18 @@
     setGain(float gain) generates (Result retval);
 
     /**
+     * Called when the metadata of the stream's sink has been changed.
+     * Optional method
+     *
+     * @param sinkMetadata Description of the audio that is suggested by the clients.
+     * @return retval operation completion status.
+     *        If any of the metadata fields contains an invalid value,
+     *        returns INVALID_ARGUMENTS.
+     *        If method isn't supported by the HAL returns NOT_SUPPORTED.
+     */
+    updateSinkMetadata(SinkMetadata sinkMetadata) generates (Result retval);
+
+    /**
      * Commands that can be executed on the driver reader thread.
      */
     enum ReadCommand : int32_t {
@@ -82,12 +94,6 @@
     };
 
     /**
-     * Called when the metadata of the stream's sink has been changed.
-     * @param sinkMetadata Description of the audio that is suggested by the clients.
-     */
-    updateSinkMetadata(SinkMetadata sinkMetadata);
-
-    /**
      * Set up required transports for receiving audio buffers from the driver.
      *
      * The transport consists of three message queues:
diff --git a/audio/7.0/IStreamOut.hal b/audio/7.0/IStreamOut.hal
index 38d750f..4daab26 100644
--- a/audio/7.0/IStreamOut.hal
+++ b/audio/7.0/IStreamOut.hal
@@ -45,6 +45,18 @@
     setVolume(float left, float right) generates (Result retval);
 
     /**
+     * Called when the metadata of the stream's source has been changed.
+     * Optional method
+     *
+     * @param sourceMetadata Description of the audio that is played by the clients.
+     * @return retval operation completion status.
+     *        If any of the metadata fields contains an invalid value,
+     *        returns INVALID_ARGUMENTS.
+     *        If method isn't supported by the HAL returns NOT_SUPPORTED.
+     */
+    updateSourceMetadata(SourceMetadata sourceMetadata) generates (Result retval);
+
+    /**
      * Commands that can be executed on the driver writer thread.
      */
     enum WriteCommand : int32_t {
@@ -77,12 +89,6 @@
     };
 
     /**
-     * Called when the metadata of the stream's source has been changed.
-     * @param sourceMetadata Description of the audio that is played by the clients.
-     */
-    updateSourceMetadata(SourceMetadata sourceMetadata);
-
-    /**
      * Set up required transports for passing audio buffers to the driver.
      *
      * The transport consists of three message queues:
diff --git a/audio/common/7.0/enums/include/android_audio_policy_configuration_V7_0-enums.h b/audio/common/7.0/enums/include/android_audio_policy_configuration_V7_0-enums.h
index b7c1cc9..c0042db 100644
--- a/audio/common/7.0/enums/include/android_audio_policy_configuration_V7_0-enums.h
+++ b/audio/common/7.0/enums/include/android_audio_policy_configuration_V7_0-enums.h
@@ -212,12 +212,11 @@
     return isOutputDevice(stringToAudioDevice(device));
 }
 
-static inline bool isVendorExtension(const std::string& device) {
+static inline bool isVendorExtension(const std::string& s) {
     // Must match the "vendorExtension" rule from the XSD file.
     static const std::string vendorPrefix = "VX_";
-    return device.size() > vendorPrefix.size() &&
-           device.substr(0, vendorPrefix.size()) == vendorPrefix &&
-           std::all_of(device.begin() + vendorPrefix.size(), device.end(),
+    return s.size() > vendorPrefix.size() && s.substr(0, vendorPrefix.size()) == vendorPrefix &&
+           std::all_of(s.begin() + vendorPrefix.size(), s.end(),
                        [](unsigned char c) { return c == '_' || std::isalnum(c); });
 }
 
diff --git a/audio/common/7.0/types.hal b/audio/common/7.0/types.hal
index ed56c73..ed6d94f 100644
--- a/audio/common/7.0/types.hal
+++ b/audio/common/7.0/types.hal
@@ -270,14 +270,29 @@
  */
 struct AudioConfig {
     AudioConfigBase base;
-    AudioOffloadInfo offloadInfo;
+    safe_union OffloadInfo {
+        Monostate unspecified;
+        AudioOffloadInfo info;
+    } offloadInfo;
     uint64_t frameCount;
 };
 
+/**
+ * AudioTag is an additional use case qualifier complementing
+ * AudioUsage and AudioContentType. Tags are set by vendor specific applications
+ * and must be prefixed by "VX_". Vendor must namespace their tag
+ * names to avoid conflicts. See 'vendorExtension' in audio_policy_configuration.xsd
+ * for a formal definition.
+ */
+typedef string AudioTag;
+
 /** Metadata of a playback track for a StreamOut. */
 struct PlaybackTrackMetadata {
     AudioUsage usage;
     AudioContentType contentType;
+    /** Tags from AudioTrack audio atttributes */
+    vec<AudioTag> tags;
+    AudioChannelMask channelMask;
     /**
      * Positive linear gain applied to the track samples. 0 being muted and 1 is no attenuation,
      * 2 means double amplification...
@@ -294,6 +309,9 @@
 /** Metadata of a record track for a StreamIn. */
 struct RecordTrackMetadata {
     AudioSource source;
+    /** Tags from AudioTrack audio atttributes */
+    vec<AudioTag> tags;
+    AudioChannelMask channelMask;
     /**
      * Positive linear gain applied to the track samples. 0 being muted and 1 is no attenuation,
      * 2 means double amplification...
diff --git a/audio/common/all-versions/default/7.0/HidlUtils.cpp b/audio/common/all-versions/default/7.0/HidlUtils.cpp
index c985a70..de19faf 100644
--- a/audio/common/all-versions/default/7.0/HidlUtils.cpp
+++ b/audio/common/all-versions/default/7.0/HidlUtils.cpp
@@ -21,6 +21,7 @@
 #include <log/log.h>
 
 #include <android_audio_policy_configuration_V7_0-enums.h>
+#include <common/all-versions/HidlSupport.h>
 #include <common/all-versions/VersionUtils.h>
 
 #include "HidlUtils.h"
@@ -306,7 +307,12 @@
     audio_config_base_t halConfigBase = {halConfig.sample_rate, halConfig.channel_mask,
                                          halConfig.format};
     CONVERT_CHECKED(audioConfigBaseFromHal(halConfigBase, isInput, &config->base), result);
-    CONVERT_CHECKED(audioOffloadInfoFromHal(halConfig.offload_info, &config->offloadInfo), result);
+    if (halConfig.offload_info.sample_rate != 0) {
+        config->offloadInfo.info({});
+        CONVERT_CHECKED(
+                audioOffloadInfoFromHal(halConfig.offload_info, &config->offloadInfo.info()),
+                result);
+    }
     config->frameCount = halConfig.frame_count;
     return result;
 }
@@ -319,7 +325,11 @@
     halConfig->sample_rate = halConfigBase.sample_rate;
     halConfig->channel_mask = halConfigBase.channel_mask;
     halConfig->format = halConfigBase.format;
-    CONVERT_CHECKED(audioOffloadInfoToHal(config.offloadInfo, &halConfig->offload_info), result);
+    if (config.offloadInfo.getDiscriminator() ==
+        AudioConfig::OffloadInfo::hidl_discriminator::info) {
+        CONVERT_CHECKED(audioOffloadInfoToHal(config.offloadInfo.info(), &halConfig->offload_info),
+                        result);
+    }
     halConfig->frame_count = config.frameCount;
     return result;
 }
@@ -800,6 +810,47 @@
     return result;
 }
 
+status_t HidlUtils::audioTagsFromHal(const char* halTags, hidl_vec<AudioTag>* tags) {
+    std::vector<std::string> strTags = utils::splitString(halTags, sAudioTagSeparator);
+    status_t result = NO_ERROR;
+    tags->resize(strTags.size());
+    size_t to = 0;
+    for (size_t from = 0; from < strTags.size(); ++from) {
+        if (xsd::isVendorExtension(strTags[from])) {
+            (*tags)[to++] = strTags[from];
+        } else {
+            result = BAD_VALUE;
+        }
+    }
+    if (to != strTags.size()) {
+        tags->resize(to);
+    }
+    return result;
+}
+
+status_t HidlUtils::audioTagsToHal(const hidl_vec<AudioTag>& tags, char* halTags) {
+    memset(halTags, 0, AUDIO_ATTRIBUTES_TAGS_MAX_SIZE);
+    status_t result = NO_ERROR;
+    std::ostringstream halTagsBuffer;
+    bool hasValue = false;
+    for (const auto& tag : tags) {
+        if (hasValue) {
+            halTagsBuffer << sAudioTagSeparator;
+        }
+        if (xsd::isVendorExtension(tag) && strchr(tag.c_str(), sAudioTagSeparator) == nullptr) {
+            halTagsBuffer << tag;
+            hasValue = true;
+        } else {
+            result = BAD_VALUE;
+        }
+    }
+    std::string fullHalTags{std::move(halTagsBuffer.str())};
+    strncpy(halTags, fullHalTags.c_str(), AUDIO_ATTRIBUTES_TAGS_MAX_SIZE);
+    CONVERT_CHECKED(fullHalTags.length() <= AUDIO_ATTRIBUTES_TAGS_MAX_SIZE ? NO_ERROR : BAD_VALUE,
+                    result);
+    return result;
+}
+
 status_t HidlUtils::deviceAddressFromHal(audio_devices_t halDeviceType,
                                          const char* halDeviceAddress, DeviceAddress* device) {
     status_t result = NO_ERROR;
diff --git a/audio/common/all-versions/default/HidlUtils.h b/audio/common/all-versions/default/HidlUtils.h
index a0bd1bc..8e9275c 100644
--- a/audio/common/all-versions/default/HidlUtils.h
+++ b/audio/common/all-versions/default/HidlUtils.h
@@ -77,6 +77,8 @@
 #endif
 
 #if MAJOR_VERSION >= 7
+    static constexpr char sAudioTagSeparator = ';';
+
     static status_t audioChannelMaskFromHal(audio_channel_mask_t halChannelMask, bool isInput,
                                             AudioChannelMask* channelMask);
     static status_t audioChannelMasksFromHal(const std::vector<std::string>& halChannelMasks,
@@ -107,6 +109,8 @@
                                            AudioStreamType* streamType);
     static status_t audioStreamTypeToHal(const AudioStreamType& streamType,
                                          audio_stream_type_t* halStreamType);
+    static status_t audioTagsFromHal(const char* halTags, hidl_vec<AudioTag>* tags);
+    static status_t audioTagsToHal(const hidl_vec<AudioTag>& tags, char* halTags);
 
   private:
     static status_t audioIndexChannelMaskFromHal(audio_channel_mask_t halChannelMask,
@@ -126,6 +130,7 @@
                                                struct audio_port_config_device_ext* device,
                                                struct audio_port_config_mix_ext* mix,
                                                struct audio_port_config_session_ext* session);
+
 #endif  // MAJOR_VERSION >= 7
 
     // V4 and below have DeviceAddress defined in the 'core' interface.
diff --git a/audio/common/all-versions/default/tests/hidlutils_tests.cpp b/audio/common/all-versions/default/tests/hidlutils_tests.cpp
index 22571c0..fef88b4 100644
--- a/audio/common/all-versions/default/tests/hidlutils_tests.cpp
+++ b/audio/common/all-versions/default/tests/hidlutils_tests.cpp
@@ -589,16 +589,29 @@
     config.base.sampleRateHz = 44100;
     config.base.channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO);
     config.base.format = toString(xsd::AudioFormat::AUDIO_FORMAT_PCM_16_BIT);
-    config.offloadInfo.base = config.base;
-    config.offloadInfo.streamType = toString(xsd::AudioStreamType::AUDIO_STREAM_MUSIC);
-    config.offloadInfo.bitRatePerSecond = 320;
-    config.offloadInfo.durationMicroseconds = -1;
-    config.offloadInfo.bitWidth = 16;
-    config.offloadInfo.bufferSize = 1024;
-    config.offloadInfo.usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA);
-    config.offloadInfo.encapsulationMode = AudioEncapsulationMode::ELEMENTARY_STREAM;
-    config.offloadInfo.contentId = 42;
-    config.offloadInfo.syncId = 13;
+    audio_config_t halConfig;
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioConfigToHal(config, &halConfig));
+    AudioConfig configBack;
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioConfigFromHal(halConfig, false /*isInput*/, &configBack));
+    EXPECT_EQ(config, configBack);
+}
+
+TEST(HidlUtils, ConvertConfigWithOffloadInfo) {
+    AudioConfig config = {};
+    config.base.sampleRateHz = 44100;
+    config.base.channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO);
+    config.base.format = toString(xsd::AudioFormat::AUDIO_FORMAT_PCM_16_BIT);
+    config.offloadInfo.info(
+            AudioOffloadInfo{.base = config.base,
+                             .streamType = toString(xsd::AudioStreamType::AUDIO_STREAM_MUSIC),
+                             .bitRatePerSecond = 320,
+                             .durationMicroseconds = -1,
+                             .bitWidth = 16,
+                             .bufferSize = 1024,
+                             .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+                             .encapsulationMode = AudioEncapsulationMode::ELEMENTARY_STREAM,
+                             .contentId = 42,
+                             .syncId = 13});
     audio_config_t halConfig;
     EXPECT_EQ(NO_ERROR, HidlUtils::audioConfigToHal(config, &halConfig));
     AudioConfig configBack;
@@ -707,3 +720,43 @@
     EXPECT_EQ(NO_ERROR, HidlUtils::audioPortToHal(portBack, &halPortBack));
     EXPECT_TRUE(audio_ports_v7_are_equal(&halPort, &halPortBack));
 }
+
+TEST(HidlUtils, ConvertInvalidAudioTags) {
+    char halTag[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE] = {};
+
+    hidl_vec<AudioTag> emptyTag = {{""}};
+    EXPECT_EQ(BAD_VALUE, HidlUtils::audioTagsToHal(emptyTag, halTag));
+
+    hidl_vec<AudioTag> longTag = {{std::string(AUDIO_ATTRIBUTES_TAGS_MAX_SIZE + 1, 'A')}};
+    EXPECT_EQ(BAD_VALUE, HidlUtils::audioTagsToHal(longTag, halTag));
+
+    hidl_vec<AudioTag> tagSeparator = {
+            {std::string(AUDIO_ATTRIBUTES_TAGS_MAX_SIZE - 1, HidlUtils::sAudioTagSeparator)}};
+    EXPECT_EQ(BAD_VALUE, HidlUtils::audioTagsToHal(tagSeparator, halTag));
+
+    hidl_vec<AudioTag> notExtensions = {{"random string", "VX_", "VX_GOOGLE_$$"}};
+    EXPECT_EQ(BAD_VALUE, HidlUtils::audioTagsToHal(notExtensions, halTag));
+}
+
+TEST(HidlUtils, ConvertAudioTags) {
+    hidl_vec<AudioTag> emptyTags;
+    char halEmptyTags[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE] = {};
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsToHal(emptyTags, halEmptyTags));
+    hidl_vec<AudioTag> emptyTagsBack;
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsFromHal(halEmptyTags, &emptyTagsBack));
+    EXPECT_EQ(emptyTags, emptyTagsBack);
+
+    hidl_vec<AudioTag> oneTag = {{"VX_GOOGLE_VR"}};
+    char halOneTag[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE] = {};
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsToHal(oneTag, halOneTag));
+    hidl_vec<AudioTag> oneTagBack;
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsFromHal(halOneTag, &oneTagBack));
+    EXPECT_EQ(oneTag, oneTagBack);
+
+    hidl_vec<AudioTag> twoTags = {{"VX_GOOGLE_VR_42", "VX_GOOGLE_1E100"}};
+    char halTwoTags[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE] = {};
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsToHal(twoTags, halTwoTags));
+    hidl_vec<AudioTag> twoTagsBack;
+    EXPECT_EQ(NO_ERROR, HidlUtils::audioTagsFromHal(halTwoTags, &twoTagsBack));
+    EXPECT_EQ(twoTags, twoTagsBack);
+}
diff --git a/audio/common/all-versions/util/include/common/all-versions/HidlSupport.h b/audio/common/all-versions/util/include/common/all-versions/HidlSupport.h
index b514a43..d7802cf 100644
--- a/audio/common/all-versions/util/include/common/all-versions/HidlSupport.h
+++ b/audio/common/all-versions/util/include/common/all-versions/HidlSupport.h
@@ -20,6 +20,9 @@
 
 #include <hidl/HidlSupport.h>
 #include <algorithm>
+#include <sstream>
+#include <string>
+#include <vector>
 
 namespace android::hardware::audio::common::utils {
 
@@ -29,6 +32,16 @@
     return std::find(values.begin(), values.end(), e) != values.end();
 }
 
+static inline std::vector<std::string> splitString(const std::string& s, char separator) {
+    std::istringstream iss(s);
+    std::string t;
+    std::vector<std::string> result;
+    while (std::getline(iss, t, separator)) {
+        result.push_back(std::move(t));
+    }
+    return result;
+}
+
 } // namespace android::hardware::audio::common::utils
 
 #endif  // android_hardware_audio_common_HidlSupport_H_
diff --git a/audio/core/all-versions/default/Conversions.cpp b/audio/core/all-versions/default/Conversions.cpp
index 8e0a140..f1752cc 100644
--- a/audio/core/all-versions/default/Conversions.cpp
+++ b/audio/core/all-versions/default/Conversions.cpp
@@ -32,14 +32,10 @@
 
 using ::android::hardware::audio::common::CPP_VERSION::implementation::HidlUtils;
 
-#if MAJOR_VERSION <= 6
-std::string deviceAddressToHal(const DeviceAddress& address) {
-    audio_devices_t halDevice;
-    char halAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
-    (void)deviceAddressToHal(address, &halDevice, halAddress);
-    return halAddress;
-}
-#endif
+#define CONVERT_CHECKED(expr, result)                   \
+    if (status_t status = (expr); status != NO_ERROR) { \
+        result = status;                                \
+    }
 
 status_t deviceAddressToHal(const DeviceAddress& device, audio_devices_t* halDeviceType,
                             char* halDeviceAddress) {
@@ -97,6 +93,52 @@
     }
     return status;
 }
+
+status_t sinkMetadataToHal(const SinkMetadata& sinkMetadata,
+                           std::vector<record_track_metadata>* halTracks) {
+    status_t result = NO_ERROR;
+    if (halTracks != nullptr) {
+        halTracks->reserve(sinkMetadata.tracks.size());
+    }
+    for (auto& metadata : sinkMetadata.tracks) {
+        record_track_metadata halTrackMetadata{.gain = metadata.gain};
+        CONVERT_CHECKED(HidlUtils::audioSourceToHal(metadata.source, &halTrackMetadata.source),
+                        result);
+#if MAJOR_VERSION >= 5
+        if (metadata.destination.getDiscriminator() ==
+            RecordTrackMetadata::Destination::hidl_discriminator::device) {
+            CONVERT_CHECKED(
+                    deviceAddressToHal(metadata.destination.device(), &halTrackMetadata.dest_device,
+                                       halTrackMetadata.dest_device_address),
+                    result);
+        }
+#endif
+        if (halTracks != nullptr) {
+            halTracks->push_back(std::move(halTrackMetadata));
+        }
+    }
+    return result;
+}
+
+status_t sourceMetadataToHal(const SourceMetadata& sourceMetadata,
+                             std::vector<playback_track_metadata_t>* halTracks) {
+    status_t result = NO_ERROR;
+    if (halTracks != nullptr) {
+        halTracks->reserve(sourceMetadata.tracks.size());
+    }
+    for (auto& metadata : sourceMetadata.tracks) {
+        playback_track_metadata_t halTrackMetadata{.gain = metadata.gain};
+        CONVERT_CHECKED(HidlUtils::audioUsageToHal(metadata.usage, &halTrackMetadata.usage),
+                        result);
+        CONVERT_CHECKED(HidlUtils::audioContentTypeToHal(metadata.contentType,
+                                                         &halTrackMetadata.content_type),
+                        result);
+        if (halTracks != nullptr) {
+            halTracks->push_back(std::move(halTrackMetadata));
+        }
+    }
+    return result;
+}
 #endif  // MAJOR_VERSION >= 4
 
 #if MAJOR_VERSION >= 7
@@ -135,6 +177,50 @@
     }
     return success;
 }
+
+status_t sinkMetadataToHalV7(const SinkMetadata& sinkMetadata,
+                             std::vector<record_track_metadata_v7_t>* halTracks) {
+    std::vector<record_track_metadata> bases;
+    status_t result = sinkMetadataToHal(sinkMetadata, halTracks != nullptr ? &bases : nullptr);
+    if (halTracks != nullptr) {
+        halTracks->reserve(bases.size());
+    }
+    auto baseIter = std::make_move_iterator(bases.begin());
+    for (auto& metadata : sinkMetadata.tracks) {
+        record_track_metadata_v7_t halTrackMetadata;
+        CONVERT_CHECKED(HidlUtils::audioChannelMaskToHal(metadata.channelMask,
+                                                         &halTrackMetadata.channel_mask),
+                        result);
+        CONVERT_CHECKED(HidlUtils::audioTagsToHal(metadata.tags, halTrackMetadata.tags), result);
+        if (halTracks != nullptr) {
+            halTrackMetadata.base = std::move(*baseIter++);
+            halTracks->push_back(std::move(halTrackMetadata));
+        }
+    }
+    return result;
+}
+
+status_t sourceMetadataToHalV7(const SourceMetadata& sourceMetadata,
+                               std::vector<playback_track_metadata_v7_t>* halTracks) {
+    std::vector<playback_track_metadata_t> bases;
+    status_t result = sourceMetadataToHal(sourceMetadata, halTracks != nullptr ? &bases : nullptr);
+    if (halTracks != nullptr) {
+        halTracks->reserve(bases.size());
+    }
+    auto baseIter = std::make_move_iterator(bases.begin());
+    for (auto& metadata : sourceMetadata.tracks) {
+        playback_track_metadata_v7_t halTrackMetadata;
+        CONVERT_CHECKED(HidlUtils::audioChannelMaskToHal(metadata.channelMask,
+                                                         &halTrackMetadata.channel_mask),
+                        result);
+        CONVERT_CHECKED(HidlUtils::audioTagsToHal(metadata.tags, halTrackMetadata.tags), result);
+        if (halTracks != nullptr) {
+            halTrackMetadata.base = std::move(*baseIter++);
+            halTracks->push_back(std::move(halTrackMetadata));
+        }
+    }
+    return result;
+}
 #endif
 
 }  // namespace implementation
diff --git a/audio/core/all-versions/default/Device.cpp b/audio/core/all-versions/default/Device.cpp
index bb69f0b..7caed44 100644
--- a/audio/core/all-versions/default/Device.cpp
+++ b/audio/core/all-versions/default/Device.cpp
@@ -135,13 +135,14 @@
 
 Return<void> Device::getInputBufferSize(const AudioConfig& config, getInputBufferSize_cb _hidl_cb) {
     audio_config_t halConfig;
-    HidlUtils::audioConfigToHal(config, &halConfig);
-    size_t halBufferSize = mDevice->get_input_buffer_size(mDevice, &halConfig);
     Result retval(Result::INVALID_ARGUMENTS);
     uint64_t bufferSize = 0;
-    if (halBufferSize != 0) {
-        retval = Result::OK;
-        bufferSize = halBufferSize;
+    if (HidlUtils::audioConfigToHal(config, &halConfig) == NO_ERROR) {
+        size_t halBufferSize = mDevice->get_input_buffer_size(mDevice, &halConfig);
+        if (halBufferSize != 0) {
+            retval = Result::OK;
+            bufferSize = halBufferSize;
+        }
     }
     _hidl_cb(retval, bufferSize);
     return Void();
@@ -153,7 +154,9 @@
                                                                 const AudioOutputFlags& flags,
                                                                 AudioConfig* suggestedConfig) {
     audio_config_t halConfig;
-    HidlUtils::audioConfigToHal(config, &halConfig);
+    if (HidlUtils::audioConfigToHal(config, &halConfig) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
     audio_stream_out_t* halStream;
     audio_devices_t halDevice;
     char halDeviceAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
@@ -186,7 +189,9 @@
         int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
         const AudioInputFlags& flags, AudioSource source, AudioConfig* suggestedConfig) {
     audio_config_t halConfig;
-    HidlUtils::audioConfigToHal(config, &halConfig);
+    if (HidlUtils::audioConfigToHal(config, &halConfig) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
     audio_stream_in_t* halStream;
     audio_devices_t halDevice;
     char halDeviceAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
@@ -248,6 +253,14 @@
 #endif
                                       const SourceMetadata& sourceMetadata,
                                       openOutputStream_cb _hidl_cb) {
+#if MAJOR_VERSION <= 6
+    if (status_t status = sourceMetadataToHal(sourceMetadata, nullptr); status != NO_ERROR) {
+#else
+    if (status_t status = sourceMetadataToHalV7(sourceMetadata, nullptr); status != NO_ERROR) {
+#endif
+        _hidl_cb(analyzeStatus("sourceMetadataToHal", status), nullptr, AudioConfig{});
+        return Void();
+    }
     AudioConfig suggestedConfig;
     auto [result, streamOut] =
         openOutputStreamImpl(ioHandle, device, config, flags, &suggestedConfig);
@@ -271,7 +284,15 @@
         // This should never happen, the framework must not create as stream
         // if there is no client
         ALOGE("openInputStream called without tracks connected");
-        _hidl_cb(Result::INVALID_ARGUMENTS, nullptr, AudioConfig());
+        _hidl_cb(Result::INVALID_ARGUMENTS, nullptr, AudioConfig{});
+        return Void();
+    }
+#if MAJOR_VERSION <= 6
+    if (status_t status = sinkMetadataToHal(sinkMetadata, nullptr); status != NO_ERROR) {
+#else
+    if (status_t status = sinkMetadataToHalV7(sinkMetadata, nullptr); status != NO_ERROR) {
+#endif
+        _hidl_cb(analyzeStatus("sinkMetadataToHal", status), nullptr, AudioConfig{});
         return Void();
     }
     // Pick the first one as the main.
@@ -304,11 +325,17 @@
         const hidl_vec<AudioPortConfig>& sinks) {
     Result retval(Result::NOT_SUPPORTED);
     if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
-        std::unique_ptr<audio_port_config[]> halSources;
-        HidlUtils::audioPortConfigsToHal(sources, &halSources);
-        std::unique_ptr<audio_port_config[]> halSinks;
-        HidlUtils::audioPortConfigsToHal(sinks, &halSinks);
         audio_patch_handle_t halPatch = static_cast<audio_patch_handle_t>(patch);
+        std::unique_ptr<audio_port_config[]> halSources;
+        if (status_t status = HidlUtils::audioPortConfigsToHal(sources, &halSources);
+            status != NO_ERROR) {
+            return {analyzeStatus("audioPortConfigsToHal;sources", status), patch};
+        }
+        std::unique_ptr<audio_port_config[]> halSinks;
+        if (status_t status = HidlUtils::audioPortConfigsToHal(sinks, &halSinks);
+            status != NO_ERROR) {
+            return {analyzeStatus("audioPortConfigsToHal;sinks", status), patch};
+        }
         retval = analyzeStatus("create_audio_patch",
                                mDevice->create_audio_patch(mDevice, sources.size(), &halSources[0],
                                                            sinks.size(), &halSinks[0], &halPatch));
@@ -343,7 +370,10 @@
 Return<Result> Device::setAudioPortConfig(const AudioPortConfig& config) {
     if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
         struct audio_port_config halPortConfig;
-        HidlUtils::audioPortConfigToHal(config, &halPortConfig);
+        if (status_t status = HidlUtils::audioPortConfigToHal(config, &halPortConfig);
+            status != NO_ERROR) {
+            return analyzeStatus("audioPortConfigToHal", status);
+        }
         return analyzeStatus("set_audio_port_config",
                              mDevice->set_audio_port_config(mDevice, &halPortConfig));
     }
diff --git a/audio/core/all-versions/default/Stream.cpp b/audio/core/all-versions/default/Stream.cpp
index c74079d..f964cbb 100644
--- a/audio/core/all-versions/default/Stream.cpp
+++ b/audio/core/all-versions/default/Stream.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "StreamHAL"
 
 #include "core/default/Stream.h"
+#include "common/all-versions/HidlSupport.h"
 #include "common/all-versions/default/EffectMap.h"
 #include "core/default/Conversions.h"
 #include "core/default/Util.h"
@@ -37,6 +38,7 @@
 namespace implementation {
 
 using ::android::hardware::audio::common::CPP_VERSION::implementation::HidlUtils;
+using ::android::hardware::audio::common::utils::splitString;
 
 Stream::Stream(bool isInput, audio_stream_t* stream) : mIsInput(isInput), mStream(stream) {
     (void)mIsInput;  // prevent 'unused field' warnings in pre-V7 versions.
@@ -220,7 +222,7 @@
     // Ensure that the separator is one character, despite that it's defined as a C string.
     static_assert(sizeof(AUDIO_PARAMETER_VALUE_LIST_SEPARATOR) == 2);
     std::vector<std::string> halFormats =
-            util::splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+            splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
     hidl_vec<AudioFormat> formats;
     (void)HidlUtils::audioFormatsFromHal(halFormats, &formats);
     std::vector<AudioProfile> tempProfiles;
@@ -235,7 +237,7 @@
         result = getParam(AudioParameter::keyStreamSupportedSamplingRates, &halListValue, context);
         if (result != Result::OK) break;
         std::vector<std::string> halSampleRates =
-                util::splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+                splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
         hidl_vec<uint32_t> sampleRates;
         sampleRates.resize(halSampleRates.size());
         for (size_t i = 0; i < sampleRates.size(); ++i) {
@@ -245,7 +247,7 @@
         result = getParam(AudioParameter::keyStreamSupportedChannels, &halListValue, context);
         if (result != Result::OK) break;
         std::vector<std::string> halChannelMasks =
-                util::splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+                splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
         hidl_vec<AudioChannelMask> channelMasks;
         (void)HidlUtils::audioChannelMasksFromHal(halChannelMasks, &channelMasks);
         // Create a profile.
diff --git a/audio/core/all-versions/default/StreamIn.cpp b/audio/core/all-versions/default/StreamIn.cpp
index ead7204..2c5e9f1 100644
--- a/audio/core/all-versions/default/StreamIn.cpp
+++ b/audio/core/all-versions/default/StreamIn.cpp
@@ -478,31 +478,70 @@
 }
 
 #if MAJOR_VERSION >= 4
-Return<void> StreamIn::updateSinkMetadata(const SinkMetadata& sinkMetadata) {
-    if (mStream->update_sink_metadata == nullptr) {
-        return Void();  // not supported by the HAL
-    }
+Result StreamIn::doUpdateSinkMetadata(const SinkMetadata& sinkMetadata) {
     std::vector<record_track_metadata> halTracks;
-    halTracks.reserve(sinkMetadata.tracks.size());
-    for (auto& metadata : sinkMetadata.tracks) {
-        record_track_metadata halTrackMetadata = {.gain = metadata.gain};
-        (void)HidlUtils::audioSourceToHal(metadata.source, &halTrackMetadata.source);
-#if MAJOR_VERSION >= 5
-        if (metadata.destination.getDiscriminator() ==
-            RecordTrackMetadata::Destination::hidl_discriminator::device) {
-            (void)deviceAddressToHal(metadata.destination.device(), &halTrackMetadata.dest_device,
-                                     halTrackMetadata.dest_device_address);
+#if MAJOR_VERSION <= 6
+    (void)sinkMetadataToHal(sinkMetadata, &halTracks);
+#else
+    // Validate whether a conversion to V7 is possible. This is needed
+    // to have a consistent behavior of the HAL regardless of the API
+    // version of the legacy HAL (and also to be consistent with openInputStream).
+    std::vector<record_track_metadata_v7> halTracksV7;
+    if (status_t status = sinkMetadataToHalV7(sinkMetadata, &halTracksV7); status == NO_ERROR) {
+        halTracks.reserve(halTracksV7.size());
+        for (auto metadata_v7 : halTracksV7) {
+            halTracks.push_back(std::move(metadata_v7.base));
         }
-#endif
-        halTracks.push_back(halTrackMetadata);
+    } else {
+        return Stream::analyzeStatus("sinkMetadataToHal", status);
     }
+#endif  // MAJOR_VERSION <= 6
     const sink_metadata_t halMetadata = {
         .track_count = halTracks.size(),
         .tracks = halTracks.data(),
     };
     mStream->update_sink_metadata(mStream, &halMetadata);
+    return Result::OK;
+}
+
+#if MAJOR_VERSION >= 7
+Result StreamIn::doUpdateSinkMetadataV7(const SinkMetadata& sinkMetadata) {
+    std::vector<record_track_metadata_v7> halTracks;
+    if (status_t status = sinkMetadataToHalV7(sinkMetadata, &halTracks); status != NO_ERROR) {
+        return Stream::analyzeStatus("sinkMetadataToHal", status);
+    }
+    const sink_metadata_v7_t halMetadata = {
+            .track_count = halTracks.size(),
+            .tracks = halTracks.data(),
+    };
+    mStream->update_sink_metadata_v7(mStream, &halMetadata);
+    return Result::OK;
+}
+#endif  //  MAJOR_VERSION >= 7
+
+#if MAJOR_VERSION <= 6
+Return<void> StreamIn::updateSinkMetadata(const SinkMetadata& sinkMetadata) {
+    if (mStream->update_sink_metadata == nullptr) {
+        return Void();  // not supported by the HAL
+    }
+    (void)doUpdateSinkMetadata(sinkMetadata);
     return Void();
 }
+#elif MAJOR_VERSION >= 7
+Return<Result> StreamIn::updateSinkMetadata(const SinkMetadata& sinkMetadata) {
+    if (mDevice->version() < AUDIO_DEVICE_API_VERSION_3_2) {
+        if (mStream->update_sink_metadata == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSinkMetadata(sinkMetadata);
+    } else {
+        if (mStream->update_sink_metadata_v7 == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSinkMetadataV7(sinkMetadata);
+    }
+}
+#endif
 
 Return<void> StreamIn::getActiveMicrophones(getActiveMicrophones_cb _hidl_cb) {
     Result retval = Result::NOT_SUPPORTED;
diff --git a/audio/core/all-versions/default/StreamOut.cpp b/audio/core/all-versions/default/StreamOut.cpp
index 5633cbb..ffd3b6b 100644
--- a/audio/core/all-versions/default/StreamOut.cpp
+++ b/audio/core/all-versions/default/StreamOut.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "StreamOutHAL"
 
 #include "core/default/StreamOut.h"
+#include "core/default/Conversions.h"
 #include "core/default/Util.h"
 
 //#define LOG_NDEBUG 0
@@ -585,26 +586,71 @@
 }
 
 #if MAJOR_VERSION >= 4
-Return<void> StreamOut::updateSourceMetadata(const SourceMetadata& sourceMetadata) {
-    if (mStream->update_source_metadata == nullptr) {
-        return Void();  // not supported by the HAL
-    }
+Result StreamOut::doUpdateSourceMetadata(const SourceMetadata& sourceMetadata) {
     std::vector<playback_track_metadata_t> halTracks;
-    halTracks.reserve(sourceMetadata.tracks.size());
-    for (auto& metadata : sourceMetadata.tracks) {
-        playback_track_metadata_t halTrackMetadata = {.gain = metadata.gain};
-        (void)HidlUtils::audioUsageToHal(metadata.usage, &halTrackMetadata.usage);
-        (void)HidlUtils::audioContentTypeToHal(metadata.contentType,
-                                               &halTrackMetadata.content_type);
-        halTracks.push_back(std::move(halTrackMetadata));
+#if MAJOR_VERSION <= 6
+    (void)sourceMetadataToHal(sourceMetadata, &halTracks);
+#else
+    // Validate whether a conversion to V7 is possible. This is needed
+    // to have a consistent behavior of the HAL regardless of the API
+    // version of the legacy HAL (and also to be consistent with openOutputStream).
+    std::vector<playback_track_metadata_v7> halTracksV7;
+    if (status_t status = sourceMetadataToHalV7(sourceMetadata, &halTracksV7); status == NO_ERROR) {
+        halTracks.reserve(halTracksV7.size());
+        for (auto metadata_v7 : halTracksV7) {
+            halTracks.push_back(std::move(metadata_v7.base));
+        }
+    } else {
+        return Stream::analyzeStatus("sourceMetadataToHal", status);
     }
+#endif  // MAJOR_VERSION <= 6
     const source_metadata_t halMetadata = {
         .track_count = halTracks.size(),
         .tracks = halTracks.data(),
     };
     mStream->update_source_metadata(mStream, &halMetadata);
+    return Result::OK;
+}
+
+#if MAJOR_VERSION >= 7
+Result StreamOut::doUpdateSourceMetadataV7(const SourceMetadata& sourceMetadata) {
+    std::vector<playback_track_metadata_v7> halTracks;
+    if (status_t status = sourceMetadataToHalV7(sourceMetadata, &halTracks); status != NO_ERROR) {
+        return Stream::analyzeStatus("sourceMetadataToHal", status);
+    }
+    const source_metadata_v7_t halMetadata = {
+            .track_count = halTracks.size(),
+            .tracks = halTracks.data(),
+    };
+    mStream->update_source_metadata_v7(mStream, &halMetadata);
+    return Result::OK;
+}
+#endif  //  MAJOR_VERSION >= 7
+
+#if MAJOR_VERSION <= 6
+Return<void> StreamOut::updateSourceMetadata(const SourceMetadata& sourceMetadata) {
+    if (mStream->update_source_metadata == nullptr) {
+        return Void();  // not supported by the HAL
+    }
+    (void)doUpdateSourceMetadata(sourceMetadata);
     return Void();
 }
+#elif MAJOR_VERSION >= 7
+Return<Result> StreamOut::updateSourceMetadata(const SourceMetadata& sourceMetadata) {
+    if (mDevice->version() < AUDIO_DEVICE_API_VERSION_3_2) {
+        if (mStream->update_source_metadata == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSourceMetadata(sourceMetadata);
+    } else {
+        if (mStream->update_source_metadata_v7 == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSourceMetadataV7(sourceMetadata);
+    }
+}
+#endif
+
 Return<Result> StreamOut::selectPresentation(int32_t /*presentationId*/, int32_t /*programId*/) {
     return Result::NOT_SUPPORTED;  // TODO: propagate to legacy
 }
diff --git a/audio/core/all-versions/default/include/core/default/Conversions.h b/audio/core/all-versions/default/include/core/default/Conversions.h
index 2372771..61720d5 100644
--- a/audio/core/all-versions/default/include/core/default/Conversions.h
+++ b/audio/core/all-versions/default/include/core/default/Conversions.h
@@ -35,12 +35,6 @@
 using namespace ::android::hardware::audio::common::CPP_VERSION;
 using namespace ::android::hardware::audio::CPP_VERSION;
 
-#if MAJOR_VERSION <= 6
-// Temporary version for compatibility with forks of the default implementation.
-// Will be removed, do not use!
-std::string deviceAddressToHal(const DeviceAddress& address);
-#endif
-
 status_t deviceAddressToHal(const DeviceAddress& device, audio_devices_t* halDeviceType,
                             char* halDeviceAddress);
 status_t deviceAddressFromHal(audio_devices_t halDeviceType, const char* halDeviceAddress,
@@ -49,6 +43,10 @@
 #if MAJOR_VERSION >= 4
 bool halToMicrophoneCharacteristics(MicrophoneInfo* pDst,
                                     const struct audio_microphone_characteristic_t& src);
+status_t sinkMetadataToHal(const SinkMetadata& sinkMetadata,
+                           std::vector<record_track_metadata>* halTracks);
+status_t sourceMetadataToHal(const SourceMetadata& sourceMetadata,
+                             std::vector<playback_track_metadata_t>* halTracks);
 #endif
 
 #if MAJOR_VERSION <= 6
@@ -69,6 +67,11 @@
 #else
 bool audioInputFlagsToHal(const hidl_vec<AudioInOutFlag>& flags, audio_input_flags_t* halFlags);
 bool audioOutputFlagsToHal(const hidl_vec<AudioInOutFlag>& flags, audio_output_flags_t* halFlags);
+// Overloading isn't convenient when passing a nullptr.
+status_t sinkMetadataToHalV7(const SinkMetadata& sinkMetadata,
+                             std::vector<record_track_metadata_v7_t>* halTracks);
+status_t sourceMetadataToHalV7(const SourceMetadata& sourceMetadata,
+                               std::vector<playback_track_metadata_v7_t>* halTracks);
 #endif
 
 }  // namespace implementation
diff --git a/audio/core/all-versions/default/include/core/default/Device.h b/audio/core/all-versions/default/include/core/default/Device.h
index 461c253..2a4d226 100644
--- a/audio/core/all-versions/default/include/core/default/Device.h
+++ b/audio/core/all-versions/default/include/core/default/Device.h
@@ -146,6 +146,8 @@
     void closeOutputStream(audio_stream_out_t* stream);
     audio_hw_device_t* device() const { return mDevice; }
 
+    uint32_t version() const { return mDevice->common.version; }
+
   private:
     bool mIsClosed;
     audio_hw_device_t* mDevice;
@@ -161,8 +163,6 @@
     // Methods from ParametersUtil.
     char* halGetParameters(const char* keys) override;
     int halSetParameters(const char* keysAndValues) override;
-
-    uint32_t version() const { return mDevice->common.version; }
 };
 
 }  // namespace implementation
diff --git a/audio/core/all-versions/default/include/core/default/StreamIn.h b/audio/core/all-versions/default/include/core/default/StreamIn.h
index b861c6c..651b3a6 100644
--- a/audio/core/all-versions/default/include/core/default/StreamIn.h
+++ b/audio/core/all-versions/default/include/core/default/StreamIn.h
@@ -114,9 +114,13 @@
     Return<void> createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) override;
     Return<void> getMmapPosition(getMmapPosition_cb _hidl_cb) override;
 #if MAJOR_VERSION >= 4
+#if MAJOR_VERSION <= 6
     Return<void> updateSinkMetadata(const SinkMetadata& sinkMetadata) override;
-    Return<void> getActiveMicrophones(getActiveMicrophones_cb _hidl_cb) override;
+#else
+    Return<Result> updateSinkMetadata(const SinkMetadata& sinkMetadata) override;
 #endif
+    Return<void> getActiveMicrophones(getActiveMicrophones_cb _hidl_cb) override;
+#endif  // MAJOR_VERSION >= 4
 #if MAJOR_VERSION >= 5
     Return<Result> setMicrophoneDirection(MicrophoneDirection direction) override;
     Return<Result> setMicrophoneFieldDimension(float zoom) override;
@@ -124,7 +128,14 @@
     static Result getCapturePositionImpl(audio_stream_in_t* stream, uint64_t* frames,
                                          uint64_t* time);
 
-   private:
+  private:
+#if MAJOR_VERSION >= 4
+    Result doUpdateSinkMetadata(const SinkMetadata& sinkMetadata);
+#if MAJOR_VERSION >= 7
+    Result doUpdateSinkMetadataV7(const SinkMetadata& sinkMetadata);
+#endif
+#endif  // MAJOR_VERSION >= 4
+
     const sp<Device> mDevice;
     audio_stream_in_t* mStream;
     const sp<Stream> mStreamCommon;
diff --git a/audio/core/all-versions/default/include/core/default/StreamOut.h b/audio/core/all-versions/default/include/core/default/StreamOut.h
index 9f64e3e..b8e8515 100644
--- a/audio/core/all-versions/default/include/core/default/StreamOut.h
+++ b/audio/core/all-versions/default/include/core/default/StreamOut.h
@@ -123,9 +123,13 @@
     Return<void> createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) override;
     Return<void> getMmapPosition(getMmapPosition_cb _hidl_cb) override;
 #if MAJOR_VERSION >= 4
-    Return<void> updateSourceMetadata(const SourceMetadata& sourceMetadata) override;
     Return<Result> selectPresentation(int32_t presentationId, int32_t programId) override;
+#if MAJOR_VERSION <= 6
+    Return<void> updateSourceMetadata(const SourceMetadata& sourceMetadata) override;
+#else
+    Return<Result> updateSourceMetadata(const SourceMetadata& sourceMetadata) override;
 #endif
+#endif  // MAJOR_VERSION >= 4
 #if MAJOR_VERSION >= 6
     Return<void> getDualMonoMode(getDualMonoMode_cb _hidl_cb) override;
     Return<Result> setDualMonoMode(DualMonoMode mode) override;
@@ -143,6 +147,13 @@
 #endif
 
   private:
+#if MAJOR_VERSION >= 4
+    Result doUpdateSourceMetadata(const SourceMetadata& sourceMetadata);
+#if MAJOR_VERSION >= 7
+    Result doUpdateSourceMetadataV7(const SourceMetadata& sourceMetadata);
+#endif
+#endif  // MAJOR_VERSION >= 4
+
     const sp<Device> mDevice;
     audio_stream_out_t* mStream;
     const sp<Stream> mStreamCommon;
diff --git a/audio/core/all-versions/default/include/core/default/Util.h b/audio/core/all-versions/default/include/core/default/Util.h
index 3d629cd..78ae03e 100644
--- a/audio/core/all-versions/default/include/core/default/Util.h
+++ b/audio/core/all-versions/default/include/core/default/Util.h
@@ -20,8 +20,6 @@
 #include PATH(android/hardware/audio/FILE_VERSION/types.h)
 
 #include <algorithm>
-#include <sstream>
-#include <string>
 #include <vector>
 
 #include <system/audio.h>
@@ -72,16 +70,6 @@
     return analyzeStatus(status);
 }
 
-static inline std::vector<std::string> splitString(const std::string& s, char separator) {
-    std::istringstream iss(s);
-    std::string t;
-    std::vector<std::string> result;
-    while (std::getline(iss, t, separator)) {
-        result.push_back(std::move(t));
-    }
-    return result;
-}
-
 }  // namespace util
 }  // namespace implementation
 }  // namespace CPP_VERSION
diff --git a/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp b/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
index 9a4a8b2..5076dcf 100644
--- a/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
@@ -72,7 +72,10 @@
         config.base.format = toString(xsd::AudioFormat::AUDIO_FORMAT_PCM_16_BIT);
         hidl_vec<hidl_string> flags;
         const SinkMetadata initMetadata = {
-                {{.source = toString(xsd::AudioSource::AUDIO_SOURCE_MIC), .gain = 1}}};
+                {{.source = toString(xsd::AudioSource::AUDIO_SOURCE_MIC),
+                  .gain = 1,
+                  .tags = {},
+                  .channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_IN_MONO)}}};
 #endif
         EventFlag* efGroup;
         for (auto microphone : microphones) {
@@ -234,22 +237,14 @@
 
 TEST_P(InputStreamTest, updateSinkMetadata) {
     doc::test("The HAL should not crash on metadata change");
-
 #if MAJOR_VERSION <= 6
     hidl_enum_range<AudioSource> range;
-#elif MAJOR_VERSION >= 7
-    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioSource> range;
-#endif
     // Test all possible track configuration
     for (auto source : range) {
         for (float volume : {0.0, 0.5, 1.0}) {
-#if MAJOR_VERSION <= 6
             const SinkMetadata metadata = {{{.source = source, .gain = volume}}};
-#elif MAJOR_VERSION >= 7
-            const SinkMetadata metadata = {{{.source = toString(source), .gain = volume}}};
-#endif
             ASSERT_OK(stream->updateSinkMetadata(metadata))
-                << "source=" << toString(source) << ", volume=" << volume;
+                    << "source=" << toString(source) << ", volume=" << volume;
         }
     }
 
@@ -257,9 +252,30 @@
 
     // Set no metadata as if all stream track had stopped
     ASSERT_OK(stream->updateSinkMetadata({}));
-
     // Restore initial
     ASSERT_OK(stream->updateSinkMetadata(initMetadata));
+
+#elif MAJOR_VERSION >= 7
+    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioSource> range;
+    // Test all possible track configuration
+    for (auto source : range) {
+        for (float volume : {0.0, 0.5, 1.0}) {
+            const SinkMetadata metadata = {
+                    {{.source = toString(source),
+                      .gain = volume,
+                      .tags = {},
+                      .channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_IN_MONO)}}};
+            ASSERT_RESULT(okOrNotSupported, stream->updateSinkMetadata(metadata))
+                    << "source=" << toString(source) << ", volume=" << volume;
+        }
+    }
+    // Do not test concurrent capture as this is not officially supported
+
+    // Set no metadata as if all stream track had stopped
+    ASSERT_RESULT(okOrNotSupported, stream->updateSinkMetadata({}));
+    // Restore initial
+    ASSERT_RESULT(okOrNotSupported, stream->updateSinkMetadata(initMetadata));
+#endif
 }
 
 TEST_P(OutputStreamTest, SelectPresentation) {
@@ -269,56 +285,82 @@
 
 TEST_P(OutputStreamTest, updateSourceMetadata) {
     doc::test("The HAL should not crash on metadata change");
-
 #if MAJOR_VERSION <= 6
     hidl_enum_range<AudioUsage> usageRange;
     hidl_enum_range<AudioContentType> contentRange;
-#elif MAJOR_VERSION >= 7
-    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioUsage> usageRange;
-    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioContentType> contentRange;
-#endif
     // Test all possible track configuration
     for (auto usage : usageRange) {
         for (auto content : contentRange) {
             for (float volume : {0.0, 0.5, 1.0}) {
-#if MAJOR_VERSION <= 6
                 const SourceMetadata metadata = {{{usage, content, volume}}};
-#elif MAJOR_VERSION >= 7
-                const SourceMetadata metadata = {{{toString(usage), toString(content), volume}}};
-#endif
                 ASSERT_OK(stream->updateSourceMetadata(metadata))
                     << "usage=" << toString(usage) << ", content=" << toString(content)
                     << ", volume=" << volume;
             }
         }
     }
-
-    // clang-format off
     // Set many track of different configuration
+    // clang-format off
     ASSERT_OK(stream->updateSourceMetadata(
-#if MAJOR_VERSION <= 6
         {{{AudioUsage::MEDIA, AudioContentType::MUSIC, 0.1},
           {AudioUsage::VOICE_COMMUNICATION, AudioContentType::SPEECH, 1.0},
           {AudioUsage::ALARM, AudioContentType::SONIFICATION, 0.0},
           {AudioUsage::ASSISTANT, AudioContentType::UNKNOWN, 0.3}}}
-#elif MAJOR_VERSION >= 7
-        {{{toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
-                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC), 0.1},
-          {toString(xsd::AudioUsage::AUDIO_USAGE_VOICE_COMMUNICATION),
-                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_SPEECH), 1.0},
-          {toString(xsd::AudioUsage::AUDIO_USAGE_ALARM),
-                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_SONIFICATION), 0.0},
-          {toString(xsd::AudioUsage::AUDIO_USAGE_ASSISTANT),
-                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_UNKNOWN), 0.3}}}
-#endif
     ));
     // clang-format on
-
     // Set no metadata as if all stream track had stopped
     ASSERT_OK(stream->updateSourceMetadata({}));
-
     // Restore initial
     ASSERT_OK(stream->updateSourceMetadata(initMetadata));
+#elif MAJOR_VERSION >= 7
+    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioUsage> usageRange;
+    xsdc_enum_range<android::audio::policy::configuration::V7_0::AudioContentType> contentRange;
+    // Test all possible track configuration
+    for (auto usage : usageRange) {
+        for (auto content : contentRange) {
+            for (float volume : {0.0, 0.5, 1.0}) {
+                const SourceMetadata metadata = {
+                        {{toString(usage),
+                          toString(content),
+                          {} /* tags */,
+                          toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO),
+                          volume}}};
+                ASSERT_RESULT(okOrNotSupported, stream->updateSourceMetadata(metadata))
+                        << "usage=" << toString(usage) << ", content=" << toString(content)
+                        << ", volume=" << volume;
+            }
+        }
+    }
+    // Set many track of different configuration
+    // clang-format off
+    ASSERT_RESULT(okOrNotSupported, stream->updateSourceMetadata(
+        {{{toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+                      {},
+                      toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO),
+                      0.1},
+          {toString(xsd::AudioUsage::AUDIO_USAGE_VOICE_COMMUNICATION),
+                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_SPEECH),
+                      {}, // tags
+                      toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_MONO),
+                      1.0},
+          {toString(xsd::AudioUsage::AUDIO_USAGE_ALARM),
+                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_SONIFICATION),
+                      {}, // tags
+                      toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO),
+                      0.0},
+          {toString(xsd::AudioUsage::AUDIO_USAGE_ASSISTANT),
+                      toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_UNKNOWN),
+                      {},
+                      toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_MONO),
+                      0.3}}}
+    ));
+    // clang-format on
+    // Set no metadata as if all stream track had stopped
+    ASSERT_RESULT(okOrNotSupported, stream->updateSourceMetadata({}));
+    // Restore initial
+    ASSERT_RESULT(okOrNotSupported, stream->updateSourceMetadata(initMetadata));
+#endif
 }
 
 TEST_P(AudioPrimaryHidlTest, setMode) {
diff --git a/audio/core/all-versions/vts/functional/6.0/AudioPrimaryHidlHalTest.cpp b/audio/core/all-versions/vts/functional/6.0/AudioPrimaryHidlHalTest.cpp
index bd8de2d..0f0cdcf 100644
--- a/audio/core/all-versions/vts/functional/6.0/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/all-versions/vts/functional/6.0/AudioPrimaryHidlHalTest.cpp
@@ -18,137 +18,131 @@
 #include "5.0/AudioPrimaryHidlHalTest.cpp"
 
 #if MAJOR_VERSION <= 6
-const std::vector<DeviceConfigParameter>& getOutputDeviceConfigParameters() {
-    static std::vector<DeviceConfigParameter> parameters = [] {
-        std::vector<DeviceConfigParameter> result;
-        for (const auto& device : getDeviceParameters()) {
-            auto module =
-                    getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
-            for (const auto& ioProfile : module->getOutputProfiles()) {
-                for (const auto& profile : ioProfile->getAudioProfiles()) {
-                    const auto& channels = profile->getChannels();
-                    const auto& sampleRates = profile->getSampleRates();
-                    auto configs = ConfigHelper::combineAudioConfig(
-                            std::vector<audio_channel_mask_t>(channels.begin(), channels.end()),
-                            std::vector<uint32_t>(sampleRates.begin(), sampleRates.end()),
-                            profile->getFormat());
-                    auto flags = ioProfile->getFlags();
-                    for (auto& config : configs) {
-                        // Some combinations of flags declared in the config file require special
-                        // treatment.
-                        if (flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) {
-                            config.offloadInfo.sampleRateHz = config.sampleRateHz;
-                            config.offloadInfo.channelMask = config.channelMask;
-                            config.offloadInfo.format = config.format;
-                            config.offloadInfo.streamType = AudioStreamType::MUSIC;
-                            config.offloadInfo.bitRatePerSecond = 320;
-                            config.offloadInfo.durationMicroseconds = -1;
-                            config.offloadInfo.bitWidth = 16;
-                            config.offloadInfo.bufferSize = 256;  // arbitrary value
-                            config.offloadInfo.usage = AudioUsage::MEDIA;
-                            result.emplace_back(device, config,
-                                                AudioOutputFlag(AudioOutputFlag::COMPRESS_OFFLOAD |
-                                                                AudioOutputFlag::DIRECT));
-                        } else {
-                            if (flags & AUDIO_OUTPUT_FLAG_PRIMARY) {  // ignore the flag
-                                flags &= ~AUDIO_OUTPUT_FLAG_PRIMARY;
-                            }
-                            result.emplace_back(device, config, AudioOutputFlag(flags));
+static std::vector<DeviceConfigParameter> generateOutputDeviceConfigParameters(
+        bool oneProfilePerDevice) {
+    std::vector<DeviceConfigParameter> result;
+    for (const auto& device : getDeviceParameters()) {
+        auto module =
+                getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
+        for (const auto& ioProfile : module->getOutputProfiles()) {
+            for (const auto& profile : ioProfile->getAudioProfiles()) {
+                const auto& channels = profile->getChannels();
+                const auto& sampleRates = profile->getSampleRates();
+                auto configs = ConfigHelper::combineAudioConfig(
+                        std::vector<audio_channel_mask_t>(channels.begin(), channels.end()),
+                        std::vector<uint32_t>(sampleRates.begin(), sampleRates.end()),
+                        profile->getFormat());
+                auto flags = ioProfile->getFlags();
+                for (auto& config : configs) {
+                    // Some combinations of flags declared in the config file require special
+                    // treatment.
+                    if (flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) {
+                        config.offloadInfo.sampleRateHz = config.sampleRateHz;
+                        config.offloadInfo.channelMask = config.channelMask;
+                        config.offloadInfo.format = config.format;
+                        config.offloadInfo.streamType = AudioStreamType::MUSIC;
+                        config.offloadInfo.bitRatePerSecond = 320;
+                        config.offloadInfo.durationMicroseconds = -1;
+                        config.offloadInfo.bitWidth = 16;
+                        config.offloadInfo.bufferSize = 256;  // arbitrary value
+                        config.offloadInfo.usage = AudioUsage::MEDIA;
+                        result.emplace_back(device, config,
+                                            AudioOutputFlag(AudioOutputFlag::COMPRESS_OFFLOAD |
+                                                            AudioOutputFlag::DIRECT));
+                    } else {
+                        if (flags & AUDIO_OUTPUT_FLAG_PRIMARY) {  // ignore the flag
+                            flags &= ~AUDIO_OUTPUT_FLAG_PRIMARY;
                         }
+                        result.emplace_back(device, config, AudioOutputFlag(flags));
                     }
+                    if (oneProfilePerDevice) break;
                 }
+                if (oneProfilePerDevice) break;
             }
+            if (oneProfilePerDevice) break;
         }
-        return result;
-    }();
+    }
+    return result;
+}
+
+const std::vector<DeviceConfigParameter>& getOutputDeviceConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateOutputDeviceConfigParameters(false);
     return parameters;
 }
 
-const std::vector<DeviceConfigParameter>& getInputDeviceConfigParameters() {
-    static std::vector<DeviceConfigParameter> parameters = [] {
-        std::vector<DeviceConfigParameter> result;
-        for (const auto& device : getDeviceParameters()) {
-            auto module =
-                    getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
-            for (const auto& ioProfile : module->getInputProfiles()) {
-                for (const auto& profile : ioProfile->getAudioProfiles()) {
-                    const auto& channels = profile->getChannels();
-                    const auto& sampleRates = profile->getSampleRates();
-                    auto configs = ConfigHelper::combineAudioConfig(
-                            std::vector<audio_channel_mask_t>(channels.begin(), channels.end()),
-                            std::vector<uint32_t>(sampleRates.begin(), sampleRates.end()),
-                            profile->getFormat());
-                    for (const auto& config : configs) {
-                        result.emplace_back(device, config, AudioInputFlag(ioProfile->getFlags()));
-                    }
+const std::vector<DeviceConfigParameter>& getOutputDeviceSingleConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateOutputDeviceConfigParameters(true);
+    return parameters;
+}
+
+static std::vector<DeviceConfigParameter> generateInputDeviceConfigParameters(
+        bool oneProfilePerDevice) {
+    std::vector<DeviceConfigParameter> result;
+    for (const auto& device : getDeviceParameters()) {
+        auto module =
+                getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
+        for (const auto& ioProfile : module->getInputProfiles()) {
+            for (const auto& profile : ioProfile->getAudioProfiles()) {
+                const auto& channels = profile->getChannels();
+                const auto& sampleRates = profile->getSampleRates();
+                auto configs = ConfigHelper::combineAudioConfig(
+                        std::vector<audio_channel_mask_t>(channels.begin(), channels.end()),
+                        std::vector<uint32_t>(sampleRates.begin(), sampleRates.end()),
+                        profile->getFormat());
+                for (const auto& config : configs) {
+                    result.emplace_back(device, config, AudioInputFlag(ioProfile->getFlags()));
+                    if (oneProfilePerDevice) break;
                 }
+                if (oneProfilePerDevice) break;
             }
+            if (oneProfilePerDevice) break;
         }
-        return result;
-    }();
+    }
+    return result;
+}
+
+const std::vector<DeviceConfigParameter>& getInputDeviceConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateInputDeviceConfigParameters(false);
+    return parameters;
+}
+
+const std::vector<DeviceConfigParameter>& getInputDeviceSingleConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateInputDeviceConfigParameters(true);
     return parameters;
 }
 #endif  // MAJOR_VERSION <= 6
 
-TEST_P(AudioHidlDeviceTest, CloseDeviceWithOpenedOutputStreams) {
-    doc::test("Verify that a device can't be closed if there are streams opened");
-#if MAJOR_VERSION <= 6
-    DeviceAddress address{.device = AudioDevice::OUT_DEFAULT};
-    SourceMetadata initMetadata = {{{AudioUsage::MEDIA, AudioContentType::MUSIC, 1 /* gain */}}};
-    auto flags = hidl_bitfield<AudioOutputFlag>(AudioOutputFlag::NONE);
-#elif MAJOR_VERSION >= 7
-    DeviceAddress address{.deviceType = toString(xsd::AudioDevice::AUDIO_DEVICE_OUT_DEFAULT)};
-    SourceMetadata initMetadata = {
-            {{toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
-              toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC), 1 /* gain */}}};
-    hidl_vec<AudioInOutFlag> flags;
-#endif
-    AudioConfig config{};
-    sp<IStreamOut> stream;
-    StreamHelper<IStreamOut> helper(stream);
-    AudioConfig suggestedConfig{};
-    ASSERT_NO_FATAL_FAILURE(helper.open(
-            [&](AudioIoHandle handle, AudioConfig config, auto cb) {
-                return getDevice()->openOutputStream(handle, address, config, flags, initMetadata,
-                                                     cb);
-            },
-            config, &res, &suggestedConfig));
+class SingleConfigOutputStreamTest : public OutputStreamTest {};
+TEST_P(SingleConfigOutputStreamTest, CloseDeviceWithOpenedOutputStreams) {
+    doc::test("Verify that a device can't be closed if there are output streams opened");
+    // Opening of the stream is done in SetUp.
     ASSERT_RESULT(Result::INVALID_STATE, getDevice()->close());
-    ASSERT_NO_FATAL_FAILURE(helper.close(true /*clear*/, &res));
+    ASSERT_OK(closeStream(true /*clear*/));
     ASSERT_OK(getDevice()->close());
     ASSERT_TRUE(resetDevice());
 }
+INSTANTIATE_TEST_CASE_P(SingleConfigOutputStream, SingleConfigOutputStreamTest,
+                        ::testing::ValuesIn(getOutputDeviceSingleConfigParameters()),
+                        &DeviceConfigParameterToString);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SingleConfigOutputStream);
 
-TEST_P(AudioHidlDeviceTest, CloseDeviceWithOpenedInputStreams) {
-    doc::test("Verify that a device can't be closed if there are streams opened");
-    if (!getCachedPolicyConfig().haveInputProfilesInModule(getDeviceName())) {
-        GTEST_SKIP() << "Device doesn't have input profiles";
-    }
-#if MAJOR_VERSION <= 6
-    DeviceAddress address{.device = AudioDevice::IN_DEFAULT};
-    SinkMetadata initMetadata = {{{.source = AudioSource::MIC, .gain = 1}}};
-    auto flags = hidl_bitfield<AudioInputFlag>(AudioInputFlag::NONE);
-#elif MAJOR_VERSION >= 7
-    DeviceAddress address{.deviceType = toString(xsd::AudioDevice::AUDIO_DEVICE_IN_DEFAULT)};
-    SinkMetadata initMetadata = {
-            {{.source = toString(xsd::AudioSource::AUDIO_SOURCE_MIC), .gain = 1}}};
-    hidl_vec<AudioInOutFlag> flags;
-#endif
-    AudioConfig config{};
-    sp<IStreamIn> stream;
-    StreamHelper<IStreamIn> helper(stream);
-    AudioConfig suggestedConfig{};
-    ASSERT_NO_FATAL_FAILURE(helper.open(
-            [&](AudioIoHandle handle, AudioConfig config, auto cb) {
-                return getDevice()->openInputStream(handle, address, config, flags, initMetadata,
-                                                    cb);
-            },
-            config, &res, &suggestedConfig));
+class SingleConfigInputStreamTest : public InputStreamTest {};
+TEST_P(SingleConfigInputStreamTest, CloseDeviceWithOpenedInputStreams) {
+    doc::test("Verify that a device can't be closed if there are input streams opened");
+    // Opening of the stream is done in SetUp.
     ASSERT_RESULT(Result::INVALID_STATE, getDevice()->close());
-    ASSERT_NO_FATAL_FAILURE(helper.close(true /*clear*/, &res));
+    ASSERT_OK(closeStream(true /*clear*/));
     ASSERT_OK(getDevice()->close());
     ASSERT_TRUE(resetDevice());
 }
+INSTANTIATE_TEST_CASE_P(SingleConfigInputStream, SingleConfigInputStreamTest,
+                        ::testing::ValuesIn(getInputDeviceSingleConfigParameters()),
+                        &DeviceConfigParameterToString);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SingleConfigInputStream);
 
 TEST_P(AudioPatchHidlTest, UpdatePatchInvalidHandle) {
     doc::test("Verify that passing an invalid handle to updateAudioPatch is checked");
diff --git a/audio/core/all-versions/vts/functional/7.0/AudioPrimaryHidlHalTest.cpp b/audio/core/all-versions/vts/functional/7.0/AudioPrimaryHidlHalTest.cpp
index 6bb7995..ef4daba 100644
--- a/audio/core/all-versions/vts/functional/7.0/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/all-versions/vts/functional/7.0/AudioPrimaryHidlHalTest.cpp
@@ -25,7 +25,6 @@
     for (auto channelMask : channelMasks) {
         for (auto sampleRate : sampleRates) {
             AudioConfig config{};
-            // leave offloadInfo to 0
             config.base.channelMask = toString(channelMask);
             config.base.sampleRateHz = sampleRate;
             config.base.format = format;
@@ -35,56 +34,158 @@
     return configs;
 }
 
+static std::tuple<std::vector<AudioInOutFlag>, bool> generateOutFlags(
+        const xsd::MixPorts::MixPort& mixPort) {
+    static const std::vector<AudioInOutFlag> offloadFlags = {
+            toString(xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD),
+            toString(xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_DIRECT)};
+    std::vector<AudioInOutFlag> flags;
+    bool isOffload = false;
+    if (mixPort.hasFlags()) {
+        auto xsdFlags = mixPort.getFlags();
+        isOffload = std::find(xsdFlags.begin(), xsdFlags.end(),
+                              xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) !=
+                    xsdFlags.end();
+        if (!isOffload) {
+            for (auto flag : xsdFlags) {
+                if (flag != xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_PRIMARY) {
+                    flags.push_back(toString(flag));
+                }
+            }
+        } else {
+            flags = offloadFlags;
+        }
+    }
+    return {flags, isOffload};
+}
+
+static AudioOffloadInfo generateOffloadInfo(const AudioConfigBase& base) {
+    return AudioOffloadInfo{
+            .base = base,
+            .streamType = toString(xsd::AudioStreamType::AUDIO_STREAM_MUSIC),
+            .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+            .bitRatePerSecond = 320,
+            .durationMicroseconds = -1,
+            .bitWidth = 16,
+            .bufferSize = 256  // arbitrary value
+    };
+}
+
+static std::vector<DeviceConfigParameter> generateOutputDeviceConfigParameters(
+        bool oneProfilePerDevice) {
+    std::vector<DeviceConfigParameter> result;
+    for (const auto& device : getDeviceParameters()) {
+        auto module =
+                getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
+        if (!module || !module->getFirstMixPorts()) break;
+        for (const auto& mixPort : module->getFirstMixPorts()->getMixPort()) {
+            if (mixPort.getRole() != xsd::Role::source) continue;  // not an output profile
+            auto [flags, isOffload] = generateOutFlags(mixPort);
+            for (const auto& profile : mixPort.getProfile()) {
+                auto configs = combineAudioConfig(profile.getChannelMasks(),
+                                                  profile.getSamplingRates(), profile.getFormat());
+                for (auto& config : configs) {
+                    // Some combinations of flags declared in the config file require special
+                    // treatment.
+                    if (isOffload) {
+                        config.offloadInfo.info(generateOffloadInfo(config.base));
+                    }
+                    result.emplace_back(device, config, flags);
+                    if (oneProfilePerDevice) break;
+                }
+                if (oneProfilePerDevice) break;
+            }
+            if (oneProfilePerDevice) break;
+        }
+    }
+    return result;
+}
+
 const std::vector<DeviceConfigParameter>& getOutputDeviceConfigParameters() {
-    static std::vector<DeviceConfigParameter> parameters = [] {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateOutputDeviceConfigParameters(false);
+    return parameters;
+}
+
+const std::vector<DeviceConfigParameter>& getOutputDeviceSingleConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateOutputDeviceConfigParameters(true);
+    return parameters;
+}
+
+const std::vector<DeviceConfigParameter>& getOutputDeviceInvalidConfigParameters(
+        bool generateInvalidFlags = true) {
+    static std::vector<DeviceConfigParameter> parameters = [&] {
         std::vector<DeviceConfigParameter> result;
-        const std::vector<AudioInOutFlag> offloadFlags = {
-                toString(xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD),
-                toString(xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_DIRECT)};
         for (const auto& device : getDeviceParameters()) {
             auto module =
                     getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
             if (!module || !module->getFirstMixPorts()) break;
+            bool hasRegularConfig = false, hasOffloadConfig = false;
             for (const auto& mixPort : module->getFirstMixPorts()->getMixPort()) {
                 if (mixPort.getRole() != xsd::Role::source) continue;  // not an output profile
-                std::vector<AudioInOutFlag> flags;
-                bool isOffload = false;
-                if (mixPort.hasFlags()) {
-                    auto xsdFlags = mixPort.getFlags();
-                    isOffload =
-                            std::find(xsdFlags.begin(), xsdFlags.end(),
-                                      xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) !=
-                            xsdFlags.end();
-                    if (!isOffload) {
-                        for (auto flag : xsdFlags) {
-                            if (flag != xsd::AudioInOutFlag::AUDIO_OUTPUT_FLAG_PRIMARY) {
-                                flags.push_back(toString(flag));
-                            }
-                        }
-                    } else {
-                        flags = offloadFlags;
-                    }
-                }
+                auto [validFlags, isOffload] = generateOutFlags(mixPort);
+                if ((!isOffload && hasRegularConfig) || (isOffload && hasOffloadConfig)) continue;
                 for (const auto& profile : mixPort.getProfile()) {
-                    auto configs =
-                            combineAudioConfig(profile.getChannelMasks(),
-                                               profile.getSamplingRates(), profile.getFormat());
-                    for (auto& config : configs) {
-                        // Some combinations of flags declared in the config file require special
-                        // treatment.
+                    if (!profile.hasFormat() || !profile.hasSamplingRates() ||
+                        !profile.hasChannelMasks())
+                        continue;
+                    AudioConfigBase validBase = {
+                            profile.getFormat(),
+                            static_cast<uint32_t>(profile.getSamplingRates()[0]),
+                            toString(profile.getChannelMasks()[0])};
+                    {
+                        AudioConfig config{.base = validBase};
+                        config.base.channelMask = "random_string";
                         if (isOffload) {
-                            config.offloadInfo.base = config.base;
-                            config.offloadInfo.streamType =
-                                    toString(xsd::AudioStreamType::AUDIO_STREAM_MUSIC);
-                            config.offloadInfo.usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA);
-                            config.offloadInfo.bitRatePerSecond = 320;
-                            config.offloadInfo.durationMicroseconds = -1;
-                            config.offloadInfo.bitWidth = 16;
-                            config.offloadInfo.bufferSize = 256;  // arbitrary value
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
                         }
+                        result.emplace_back(device, config, validFlags);
+                    }
+                    {
+                        AudioConfig config{.base = validBase};
+                        config.base.format = "random_string";
+                        if (isOffload) {
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                        }
+                        result.emplace_back(device, config, validFlags);
+                    }
+                    if (generateInvalidFlags) {
+                        AudioConfig config{.base = validBase};
+                        if (isOffload) {
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                        }
+                        std::vector<AudioInOutFlag> flags = {"random_string", ""};
                         result.emplace_back(device, config, flags);
                     }
+                    if (isOffload) {
+                        {
+                            AudioConfig config{.base = validBase};
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                            config.offloadInfo.info().base.channelMask = "random_string";
+                        }
+                        {
+                            AudioConfig config{.base = validBase};
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                            config.offloadInfo.info().base.format = "random_string";
+                        }
+                        {
+                            AudioConfig config{.base = validBase};
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                            config.offloadInfo.info().streamType = "random_string";
+                        }
+                        {
+                            AudioConfig config{.base = validBase};
+                            config.offloadInfo.info(generateOffloadInfo(validBase));
+                            config.offloadInfo.info().usage = "random_string";
+                        }
+                        hasOffloadConfig = true;
+                    } else {
+                        hasRegularConfig = true;
+                    }
+                    break;
                 }
+                if (hasOffloadConfig && hasRegularConfig) break;
             }
         }
         return result;
@@ -92,32 +193,568 @@
     return parameters;
 }
 
+static std::vector<DeviceConfigParameter> generateInputDeviceConfigParameters(
+        bool oneProfilePerDevice) {
+    std::vector<DeviceConfigParameter> result;
+    for (const auto& device : getDeviceParameters()) {
+        auto module =
+                getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
+        if (!module || !module->getFirstMixPorts()) break;
+        for (const auto& mixPort : module->getFirstMixPorts()->getMixPort()) {
+            if (mixPort.getRole() != xsd::Role::sink) continue;  // not an input profile
+            std::vector<AudioInOutFlag> flags;
+            if (mixPort.hasFlags()) {
+                std::transform(mixPort.getFlags().begin(), mixPort.getFlags().end(),
+                               std::back_inserter(flags), [](auto flag) { return toString(flag); });
+            }
+            for (const auto& profile : mixPort.getProfile()) {
+                auto configs = combineAudioConfig(profile.getChannelMasks(),
+                                                  profile.getSamplingRates(), profile.getFormat());
+                for (const auto& config : configs) {
+                    result.emplace_back(device, config, flags);
+                    if (oneProfilePerDevice) break;
+                }
+                if (oneProfilePerDevice) break;
+            }
+            if (oneProfilePerDevice) break;
+        }
+    }
+    return result;
+}
+
 const std::vector<DeviceConfigParameter>& getInputDeviceConfigParameters() {
-    static std::vector<DeviceConfigParameter> parameters = [] {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateInputDeviceConfigParameters(false);
+    return parameters;
+}
+
+const std::vector<DeviceConfigParameter>& getInputDeviceSingleConfigParameters() {
+    static std::vector<DeviceConfigParameter> parameters =
+            generateInputDeviceConfigParameters(true);
+    return parameters;
+}
+
+const std::vector<DeviceConfigParameter>& getInputDeviceInvalidConfigParameters(
+        bool generateInvalidFlags = true) {
+    static std::vector<DeviceConfigParameter> parameters = [&] {
         std::vector<DeviceConfigParameter> result;
         for (const auto& device : getDeviceParameters()) {
             auto module =
                     getCachedPolicyConfig().getModuleFromName(std::get<PARAM_DEVICE_NAME>(device));
             if (!module || !module->getFirstMixPorts()) break;
+            bool hasConfig = false;
             for (const auto& mixPort : module->getFirstMixPorts()->getMixPort()) {
                 if (mixPort.getRole() != xsd::Role::sink) continue;  // not an input profile
-                std::vector<AudioInOutFlag> flags;
+                std::vector<AudioInOutFlag> validFlags;
                 if (mixPort.hasFlags()) {
                     std::transform(mixPort.getFlags().begin(), mixPort.getFlags().end(),
-                                   std::back_inserter(flags),
+                                   std::back_inserter(validFlags),
                                    [](auto flag) { return toString(flag); });
                 }
                 for (const auto& profile : mixPort.getProfile()) {
-                    auto configs =
-                            combineAudioConfig(profile.getChannelMasks(),
-                                               profile.getSamplingRates(), profile.getFormat());
-                    for (const auto& config : configs) {
+                    if (!profile.hasFormat() || !profile.hasSamplingRates() ||
+                        !profile.hasChannelMasks())
+                        continue;
+                    AudioConfigBase validBase = {
+                            profile.getFormat(),
+                            static_cast<uint32_t>(profile.getSamplingRates()[0]),
+                            toString(profile.getChannelMasks()[0])};
+                    {
+                        AudioConfig config{.base = validBase};
+                        config.base.channelMask = "random_string";
+                        result.emplace_back(device, config, validFlags);
+                    }
+                    {
+                        AudioConfig config{.base = validBase};
+                        config.base.format = "random_string";
+                        result.emplace_back(device, config, validFlags);
+                    }
+                    if (generateInvalidFlags) {
+                        AudioConfig config{.base = validBase};
+                        std::vector<AudioInOutFlag> flags = {"random_string", ""};
                         result.emplace_back(device, config, flags);
                     }
+                    hasConfig = true;
+                    break;
                 }
+                if (hasConfig) break;
             }
         }
         return result;
     }();
     return parameters;
 }
+
+class InvalidInputConfigNoFlagsTest : public AudioHidlTestWithDeviceConfigParameter {};
+TEST_P(InvalidInputConfigNoFlagsTest, InputBufferSizeTest) {
+    doc::test("Verify that invalid config is rejected by IDevice::getInputBufferSize method.");
+    uint64_t bufferSize;
+    ASSERT_OK(getDevice()->getInputBufferSize(getConfig(), returnIn(res, bufferSize)));
+    EXPECT_EQ(Result::INVALID_ARGUMENTS, res);
+}
+INSTANTIATE_TEST_CASE_P(
+        InputBufferSizeInvalidConfig, InvalidInputConfigNoFlagsTest,
+        ::testing::ValuesIn(getInputDeviceInvalidConfigParameters(false /*generateInvalidFlags*/)),
+        &DeviceConfigParameterToString);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(InputBufferSizeInvalidConfig);
+
+static const DeviceAddress& getValidInputDeviceAddress() {
+    static const DeviceAddress valid = {
+            .deviceType = toString(xsd::AudioDevice::AUDIO_DEVICE_IN_DEFAULT)};
+    return valid;
+}
+
+static const DeviceAddress& getValidOutputDeviceAddress() {
+    static const DeviceAddress valid = {
+            .deviceType = toString(xsd::AudioDevice::AUDIO_DEVICE_OUT_DEFAULT)};
+    return valid;
+}
+
+static const DeviceAddress& getInvalidDeviceAddress() {
+    static const DeviceAddress valid = {.deviceType = "random_string"};
+    return valid;
+}
+
+TEST_P(AudioHidlDeviceTest, SetConnectedStateInvalidDeviceAddress) {
+    doc::test("Check that invalid device address is rejected by IDevice::setConnectedState");
+    EXPECT_RESULT(Result::INVALID_ARGUMENTS,
+                  getDevice()->setConnectedState(getInvalidDeviceAddress(), true));
+    EXPECT_RESULT(Result::INVALID_ARGUMENTS,
+                  getDevice()->setConnectedState(getInvalidDeviceAddress(), false));
+}
+
+static std::vector<AudioPortConfig>& generatePortConfigs(bool valid) {
+    enum {  // Note: This is for convenience when deriving "invalid" configs from "valid".
+        PORT_CONF_MINIMAL,
+        PORT_CONF_WITH_GAIN,
+        PORT_CONF_EXT_DEVICE,
+        PORT_CONF_EXT_MIX_SOURCE,
+        PORT_CONF_EXT_MIX_SINK,
+        PORT_CONF_EXT_SESSION
+    };
+    static std::vector<AudioPortConfig> valids = [] {
+        std::vector<AudioPortConfig> result;
+        result.reserve(PORT_CONF_EXT_SESSION + 1);
+        result.push_back(AudioPortConfig{});
+        AudioPortConfig configWithGain{};
+        configWithGain.gain.config(AudioGainConfig{
+                .index = 0,
+                .mode = {toString(xsd::AudioGainMode::AUDIO_GAIN_MODE_JOINT)},
+                .channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_MONO),
+                .rampDurationMs = 1});
+        configWithGain.gain.config().values.resize(1);
+        configWithGain.gain.config().values[0] = 1000;
+        result.push_back(std::move(configWithGain));
+        AudioPortConfig configWithPortExtDevice{};
+        configWithPortExtDevice.ext.device(getValidOutputDeviceAddress());
+        result.push_back(std::move(configWithPortExtDevice));
+        AudioPortConfig configWithPortExtMixSource{};
+        configWithPortExtMixSource.ext.mix({});
+        configWithPortExtMixSource.ext.mix().useCase.stream(
+                toString(xsd::AudioStreamType::AUDIO_STREAM_VOICE_CALL));
+        result.push_back(std::move(configWithPortExtMixSource));
+        AudioPortConfig configWithPortExtMixSink{};
+        configWithPortExtMixSink.ext.mix({});
+        configWithPortExtMixSink.ext.mix().useCase.source(
+                toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT));
+        result.push_back(std::move(configWithPortExtMixSink));
+        AudioPortConfig configWithPortExtSession{};
+        configWithPortExtSession.ext.session(
+                static_cast<AudioSession>(AudioSessionConsts::OUTPUT_MIX));
+        result.push_back(std::move(configWithPortExtSession));
+        return result;
+    }();
+    static std::vector<AudioPortConfig> invalids = [&] {
+        std::vector<AudioPortConfig> result;
+        AudioPortConfig invalidBaseChannelMask = valids[PORT_CONF_MINIMAL];
+        invalidBaseChannelMask.base.channelMask = "random_string";
+        result.push_back(std::move(invalidBaseChannelMask));
+        AudioPortConfig invalidBaseFormat = valids[PORT_CONF_MINIMAL];
+        invalidBaseFormat.base.format = "random_string";
+        result.push_back(std::move(invalidBaseFormat));
+        AudioPortConfig invalidGainMode = valids[PORT_CONF_WITH_GAIN];
+        invalidGainMode.gain.config().mode = {{"random_string"}};
+        result.push_back(std::move(invalidGainMode));
+        AudioPortConfig invalidGainChannelMask = valids[PORT_CONF_WITH_GAIN];
+        invalidGainChannelMask.gain.config().channelMask = "random_string";
+        result.push_back(std::move(invalidGainChannelMask));
+        AudioPortConfig invalidDeviceType = valids[PORT_CONF_EXT_DEVICE];
+        invalidDeviceType.ext.device().deviceType = "random_string";
+        result.push_back(std::move(invalidDeviceType));
+        AudioPortConfig invalidStreamType = valids[PORT_CONF_EXT_MIX_SOURCE];
+        invalidStreamType.ext.mix().useCase.stream() = "random_string";
+        result.push_back(std::move(invalidStreamType));
+        AudioPortConfig invalidSource = valids[PORT_CONF_EXT_MIX_SINK];
+        invalidSource.ext.mix().useCase.source() = "random_string";
+        result.push_back(std::move(invalidSource));
+        return result;
+    }();
+    return valid ? valids : invalids;
+}
+
+TEST_P(AudioHidlDeviceTest, SetAudioPortConfigInvalidArguments) {
+    doc::test("Check that invalid port configs are rejected by IDevice::setAudioPortConfig");
+    for (const auto& invalidConfig : generatePortConfigs(false /*valid*/)) {
+        EXPECT_RESULT(invalidArgsOrNotSupported, getDevice()->setAudioPortConfig(invalidConfig))
+                << ::testing::PrintToString(invalidConfig);
+    }
+}
+
+TEST_P(AudioPatchHidlTest, CreatePatchInvalidArguments) {
+    doc::test("Check that invalid port configs are rejected by IDevice::createAudioPatch");
+    // Note that HAL actually might reject the proposed source / sink combo
+    // due to other reasons than presence of invalid enum-strings.
+    // TODO: Come up with a way to guarantee validity of a source / sink combo.
+    for (const auto& validSource : generatePortConfigs(true /*valid*/)) {
+        for (const auto& invalidSink : generatePortConfigs(false /*valid*/)) {
+            AudioPatchHandle handle;
+            EXPECT_OK(getDevice()->createAudioPatch(hidl_vec<AudioPortConfig>{validSource},
+                                                    hidl_vec<AudioPortConfig>{invalidSink},
+                                                    returnIn(res, handle)));
+            EXPECT_EQ(Result::INVALID_ARGUMENTS, res)
+                    << "Source: " << ::testing::PrintToString(validSource)
+                    << "; Sink: " << ::testing::PrintToString(invalidSink);
+        }
+    }
+    for (const auto& validSink : generatePortConfigs(true /*valid*/)) {
+        for (const auto& invalidSource : generatePortConfigs(false /*valid*/)) {
+            AudioPatchHandle handle;
+            EXPECT_OK(getDevice()->createAudioPatch(hidl_vec<AudioPortConfig>{invalidSource},
+                                                    hidl_vec<AudioPortConfig>{validSink},
+                                                    returnIn(res, handle)));
+            EXPECT_EQ(Result::INVALID_ARGUMENTS, res)
+                    << "Source: " << ::testing::PrintToString(invalidSource)
+                    << "; Sink: " << ::testing::PrintToString(validSink);
+        }
+    }
+}
+
+TEST_P(AudioPatchHidlTest, UpdatePatchInvalidArguments) {
+    doc::test("Check that invalid port configs are rejected by IDevice::updateAudioPatch");
+    // Note that HAL actually might reject the proposed source / sink combo
+    // due to other reasons than presence of invalid enum-strings.
+    // TODO: Come up with a way to guarantee validity of a source / sink combo.
+    for (const auto& validSource : generatePortConfigs(true /*valid*/)) {
+        for (const auto& invalidSink : generatePortConfigs(false /*valid*/)) {
+            AudioPatchHandle handle{};
+            EXPECT_OK(getDevice()->updateAudioPatch(handle, hidl_vec<AudioPortConfig>{validSource},
+                                                    hidl_vec<AudioPortConfig>{invalidSink},
+                                                    returnIn(res, handle)));
+            EXPECT_EQ(Result::INVALID_ARGUMENTS, res)
+                    << "Source: " << ::testing::PrintToString(validSource)
+                    << "; Sink: " << ::testing::PrintToString(invalidSink);
+        }
+    }
+    for (const auto& validSink : generatePortConfigs(true /*valid*/)) {
+        for (const auto& invalidSource : generatePortConfigs(false /*valid*/)) {
+            AudioPatchHandle handle{};
+            EXPECT_OK(getDevice()->updateAudioPatch(
+                    handle, hidl_vec<AudioPortConfig>{invalidSource},
+                    hidl_vec<AudioPortConfig>{validSink}, returnIn(res, handle)));
+            EXPECT_EQ(Result::INVALID_ARGUMENTS, res)
+                    << "Source: " << ::testing::PrintToString(invalidSource)
+                    << "; Sink: " << ::testing::PrintToString(validSink);
+        }
+    }
+}
+
+enum { PARAM_DEVICE_CONFIG, PARAM_ADDRESS, PARAM_METADATA };
+enum { INDEX_SINK, INDEX_SOURCE };
+using SinkOrSourceMetadata = std::variant<SinkMetadata, SourceMetadata>;
+using StreamOpenParameter = std::tuple<DeviceConfigParameter, DeviceAddress, SinkOrSourceMetadata>;
+
+static std::string StreamOpenParameterToString(
+        const ::testing::TestParamInfo<StreamOpenParameter>& info) {
+    return DeviceConfigParameterToString(::testing::TestParamInfo<DeviceConfigParameter>{
+                   std::get<PARAM_DEVICE_CONFIG>(info.param), info.index}) +
+           "__" +
+           SanitizeStringForGTestName(
+                   ::testing::PrintToString(std::get<PARAM_ADDRESS>(info.param))) +
+           "__" +
+           SanitizeStringForGTestName(std::visit(
+                   [](auto&& arg) -> std::string { return ::testing::PrintToString(arg); },
+                   std::get<PARAM_METADATA>(info.param)));
+}
+
+class StreamOpenTest : public HidlTest, public ::testing::WithParamInterface<StreamOpenParameter> {
+  protected:
+    void SetUp() override {
+        ASSERT_NO_FATAL_FAILURE(HidlTest::SetUp());  // setup base
+        ASSERT_TRUE(getDevicesFactory() != nullptr);
+        ASSERT_TRUE(getDevice() != nullptr);
+    }
+    const std::string& getFactoryName() const override {
+        return std::get<PARAM_FACTORY_NAME>(
+                std::get<PARAM_DEVICE>(std::get<PARAM_DEVICE_CONFIG>(GetParam())));
+    }
+    const std::string& getDeviceName() const override {
+        return std::get<PARAM_DEVICE_NAME>(
+                std::get<PARAM_DEVICE>(std::get<PARAM_DEVICE_CONFIG>(GetParam())));
+    }
+    const AudioConfig& getConfig() const {
+        return std::get<PARAM_CONFIG>(std::get<PARAM_DEVICE_CONFIG>(GetParam()));
+    }
+    const hidl_vec<AudioInOutFlag> getFlags() const {
+        return std::get<PARAM_FLAGS>(std::get<PARAM_DEVICE_CONFIG>(GetParam()));
+    }
+    const DeviceAddress& getDeviceAddress() const { return std::get<PARAM_ADDRESS>(GetParam()); }
+    bool isParamForInputStream() const {
+        return std::get<PARAM_METADATA>(GetParam()).index() == INDEX_SINK;
+    }
+    const SinkMetadata& getSinkMetadata() const {
+        return std::get<INDEX_SINK>(std::get<PARAM_METADATA>(GetParam()));
+    }
+    const SourceMetadata& getSourceMetadata() const {
+        return std::get<INDEX_SOURCE>(std::get<PARAM_METADATA>(GetParam()));
+    }
+};
+
+static const RecordTrackMetadata& getValidRecordTrackMetadata() {
+    static const RecordTrackMetadata valid = {
+            .source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT), .gain = 1};
+    return valid;
+}
+
+static const RecordTrackMetadata& getValidRecordTrackMetadataWithDest() {
+    static const RecordTrackMetadata valid = {
+            .source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT),
+            .gain = 1,
+            .destination = [] {
+                RecordTrackMetadata::Destination dest;
+                dest.device(getValidOutputDeviceAddress());
+                return dest;
+            }()};
+    return valid;
+}
+
+static const RecordTrackMetadata& getInvalidSourceRecordTrackMetadata() {
+    static const RecordTrackMetadata invalid = {.source = "random_string", .gain = 1};
+    return invalid;
+}
+
+static const RecordTrackMetadata& getRecordTrackMetadataWithInvalidDest() {
+    static const RecordTrackMetadata invalid = {
+            .source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT),
+            .gain = 1,
+            .destination = [] {
+                RecordTrackMetadata::Destination dest;
+                dest.device(getInvalidDeviceAddress());
+                return dest;
+            }()};
+    return invalid;
+}
+
+static const RecordTrackMetadata& getInvalidChannelMaskRecordTrackMetadata() {
+    static const RecordTrackMetadata invalid = {
+            .source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT),
+            .gain = 1,
+            .channelMask = "random_string"};
+    return invalid;
+}
+
+static const RecordTrackMetadata& getInvalidTagsRecordTrackMetadata() {
+    static const RecordTrackMetadata invalid = {
+            .source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT),
+            .gain = 1,
+            .tags = {{"random_string"}}};
+    return invalid;
+}
+
+static const PlaybackTrackMetadata& getValidPlaybackTrackMetadata() {
+    static const PlaybackTrackMetadata valid = {
+            .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+            .contentType = toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+            .gain = 1};
+    return valid;
+}
+
+static const PlaybackTrackMetadata& getInvalidUsagePlaybackTrackMetadata() {
+    static const PlaybackTrackMetadata invalid = {
+            .usage = "random_string",
+            .contentType = toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+            .gain = 1};
+    return invalid;
+}
+
+static const PlaybackTrackMetadata& getInvalidContentTypePlaybackTrackMetadata() {
+    static const PlaybackTrackMetadata invalid = {
+            .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+            .contentType = "random_string",
+            .gain = 1};
+    return invalid;
+}
+
+static const PlaybackTrackMetadata& getInvalidChannelMaskPlaybackTrackMetadata() {
+    static const PlaybackTrackMetadata invalid = {
+            .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+            .contentType = toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+            .gain = 1,
+            .channelMask = "random_string"};
+    return invalid;
+}
+
+static const PlaybackTrackMetadata& getInvalidTagsPlaybackTrackMetadata() {
+    static const PlaybackTrackMetadata invalid = {
+            .usage = toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
+            .contentType = toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+            .gain = 1,
+            .tags = {{"random_string"}}};
+    return invalid;
+}
+
+static const std::vector<SourceMetadata>& getInvalidSourceMetadatas() {
+    static const std::vector<SourceMetadata> invalids = {
+            SourceMetadata{.tracks = {{getInvalidUsagePlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getInvalidContentTypePlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getInvalidChannelMaskPlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getInvalidTagsPlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getValidPlaybackTrackMetadata(),
+                                       getInvalidUsagePlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getValidPlaybackTrackMetadata(),
+                                       getInvalidContentTypePlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getValidPlaybackTrackMetadata(),
+                                       getInvalidChannelMaskPlaybackTrackMetadata()}}},
+            SourceMetadata{.tracks = {{getValidPlaybackTrackMetadata(),
+                                       getInvalidTagsPlaybackTrackMetadata()}}}};
+    return invalids;
+}
+static const std::vector<SinkMetadata>& getInvalidSinkMetadatas() {
+    static const std::vector<SinkMetadata> invalids = {
+            SinkMetadata{.tracks = {{getInvalidSourceRecordTrackMetadata()}}},
+            SinkMetadata{.tracks = {{getRecordTrackMetadataWithInvalidDest()}}},
+            SinkMetadata{.tracks = {{getInvalidChannelMaskRecordTrackMetadata()}}},
+            SinkMetadata{.tracks = {{getInvalidTagsRecordTrackMetadata()}}},
+            SinkMetadata{.tracks = {{getValidRecordTrackMetadata(),
+                                     getInvalidSourceRecordTrackMetadata()}}},
+            SinkMetadata{.tracks = {{getValidRecordTrackMetadata(),
+                                     getRecordTrackMetadataWithInvalidDest()}}},
+            SinkMetadata{.tracks = {{getValidRecordTrackMetadata(),
+                                     getInvalidChannelMaskRecordTrackMetadata()}}},
+            SinkMetadata{.tracks = {{getValidRecordTrackMetadata(),
+                                     getInvalidTagsRecordTrackMetadata()}}}};
+    return invalids;
+}
+template <typename T>
+static inline std::vector<SinkOrSourceMetadata> wrapMetadata(const std::vector<T>& metadata) {
+    return std::vector<SinkOrSourceMetadata>{metadata.begin(), metadata.end()};
+}
+
+TEST_P(StreamOpenTest, OpenInputOrOutputStreamTest) {
+    doc::test(
+            "Verify that invalid arguments are rejected by "
+            "IDevice::open{Input|Output}Stream method.");
+    AudioConfig suggestedConfig{};
+    if (isParamForInputStream()) {
+        sp<IStreamIn> stream;
+        ASSERT_OK(getDevice()->openInputStream(AudioIoHandle{}, getDeviceAddress(), getConfig(),
+                                               getFlags(), getSinkMetadata(),
+                                               returnIn(res, stream, suggestedConfig)));
+        ASSERT_TRUE(stream == nullptr);
+    } else {
+        sp<IStreamOut> stream;
+        ASSERT_OK(getDevice()->openOutputStream(AudioIoHandle{}, getDeviceAddress(), getConfig(),
+                                                getFlags(), getSourceMetadata(),
+                                                returnIn(res, stream, suggestedConfig)));
+        ASSERT_TRUE(stream == nullptr);
+    }
+    EXPECT_EQ(Result::INVALID_ARGUMENTS, res);
+    EXPECT_EQ(AudioConfig{}, suggestedConfig);
+}
+INSTANTIATE_TEST_CASE_P(
+        InputStreamInvalidConfig, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getInputDeviceInvalidConfigParameters()),
+                           ::testing::Values(getValidInputDeviceAddress()),
+                           ::testing::Values(SinkMetadata{
+                                   .tracks = {{getValidRecordTrackMetadata(),
+                                               getValidRecordTrackMetadataWithDest()}}})),
+        &StreamOpenParameterToString);
+INSTANTIATE_TEST_CASE_P(
+        InputStreamInvalidAddress, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getInputDeviceSingleConfigParameters()),
+                           ::testing::Values(getInvalidDeviceAddress()),
+                           ::testing::Values(SinkMetadata{
+                                   .tracks = {{getValidRecordTrackMetadata(),
+                                               getValidRecordTrackMetadataWithDest()}}})),
+        &StreamOpenParameterToString);
+INSTANTIATE_TEST_CASE_P(
+        InputStreamInvalidMetadata, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getInputDeviceSingleConfigParameters()),
+                           ::testing::Values(getValidInputDeviceAddress()),
+                           ::testing::ValuesIn(wrapMetadata(getInvalidSinkMetadatas()))),
+        &StreamOpenParameterToString);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(InputStreamInvalidConfig);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(InputStreamInvalidAddress);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(InputStreamInvalidMetadata);
+
+INSTANTIATE_TEST_CASE_P(
+        OutputStreamInvalidConfig, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getOutputDeviceInvalidConfigParameters()),
+                           ::testing::Values(getValidOutputDeviceAddress()),
+                           ::testing::Values(SourceMetadata{
+                                   .tracks = {{getValidPlaybackTrackMetadata()}}})),
+        &StreamOpenParameterToString);
+INSTANTIATE_TEST_CASE_P(
+        OutputStreamInvalidAddress, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getOutputDeviceSingleConfigParameters()),
+                           ::testing::Values(getInvalidDeviceAddress()),
+                           ::testing::Values(SourceMetadata{
+                                   .tracks = {{getValidPlaybackTrackMetadata()}}})),
+        &StreamOpenParameterToString);
+INSTANTIATE_TEST_CASE_P(
+        OutputStreamInvalidMetadata, StreamOpenTest,
+        ::testing::Combine(::testing::ValuesIn(getOutputDeviceSingleConfigParameters()),
+                           ::testing::Values(getValidOutputDeviceAddress()),
+                           ::testing::ValuesIn(wrapMetadata(getInvalidSourceMetadatas()))),
+        &StreamOpenParameterToString);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(OutputStreamInvalidConfig);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(OutputStreamInvalidAddress);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(OutputStreamInvalidMetadata);
+
+#define TEST_SINGLE_CONFIG_IO_STREAM(test_name, documentation, code) \
+    TEST_P(SingleConfigInputStreamTest, test_name) {                 \
+        doc::test(documentation);                                    \
+        code;                                                        \
+    }                                                                \
+    TEST_P(SingleConfigOutputStreamTest, test_name) {                \
+        doc::test(documentation);                                    \
+        code;                                                        \
+    }
+
+static void testSetDevicesInvalidDeviceAddress(IStream* stream) {
+    ASSERT_RESULT(Result::INVALID_ARGUMENTS, stream->setDevices({getInvalidDeviceAddress()}));
+}
+TEST_SINGLE_CONFIG_IO_STREAM(
+        SetDevicesInvalidDeviceAddress,
+        "Verify that invalid device address is rejected by IStream::setDevices",
+        areAudioPatchesSupported() ? doc::partialTest("Audio patches are supported")
+                                   : testSetDevicesInvalidDeviceAddress(stream.get()));
+
+static void testSetAudioPropertiesInvalidArguments(IStream* stream, const AudioConfigBase& base) {
+    AudioConfigBase invalidFormat = base;
+    invalidFormat.format = "random_string";
+    ASSERT_RESULT(invalidArgsOrNotSupported, stream->setAudioProperties(invalidFormat));
+
+    AudioConfigBase invalidChannelMask = base;
+    invalidChannelMask.channelMask = "random_string";
+    ASSERT_RESULT(invalidArgsOrNotSupported, stream->setAudioProperties(invalidChannelMask));
+}
+TEST_SINGLE_CONFIG_IO_STREAM(
+        SetAudioPropertiesInvalidArguments,
+        "Verify that invalid arguments are rejected by IStream::setAudioProperties",
+        testSetAudioPropertiesInvalidArguments(stream.get(), audioConfig.base));
+
+TEST_P(SingleConfigOutputStreamTest, UpdateInvalidSourceMetadata) {
+    doc::test("Verify that invalid metadata is rejected by IStreamOut::updateSourceMetadata");
+    for (const auto& metadata : getInvalidSourceMetadatas()) {
+        ASSERT_RESULT(invalidArgsOrNotSupported, stream->updateSourceMetadata(metadata))
+                << ::testing::PrintToString(metadata);
+    }
+}
+
+TEST_P(SingleConfigInputStreamTest, UpdateInvalidSinkMetadata) {
+    doc::test("Verify that invalid metadata is rejected by IStreamIn::updateSinkMetadata");
+    for (const auto& metadata : getInvalidSinkMetadatas()) {
+        ASSERT_RESULT(invalidArgsOrNotSupported, stream->updateSinkMetadata(metadata))
+                << ::testing::PrintToString(metadata);
+    }
+}
diff --git a/audio/core/all-versions/vts/functional/AudioPrimaryHidlHalTest.h b/audio/core/all-versions/vts/functional/AudioPrimaryHidlHalTest.h
index 43c44cb..f145b60 100644
--- a/audio/core/all-versions/vts/functional/AudioPrimaryHidlHalTest.h
+++ b/audio/core/all-versions/vts/functional/AudioPrimaryHidlHalTest.h
@@ -522,7 +522,9 @@
 
 #if MAJOR_VERSION >= 6
 const std::vector<DeviceConfigParameter>& getInputDeviceConfigParameters();
+const std::vector<DeviceConfigParameter>& getInputDeviceSingleConfigParameters();
 const std::vector<DeviceConfigParameter>& getOutputDeviceConfigParameters();
+const std::vector<DeviceConfigParameter>& getOutputDeviceSingleConfigParameters();
 #endif
 
 #if MAJOR_VERSION >= 4
@@ -883,7 +885,7 @@
         AudioHidlTestWithDeviceConfigParameter::TearDown();
     }
 
-   protected:
+  protected:
     AudioConfig audioConfig;
     DeviceAddress address = {};
     sp<Stream> stream;
@@ -926,6 +928,8 @@
     const SourceMetadata initMetadata = {
             { { toString(xsd::AudioUsage::AUDIO_USAGE_MEDIA),
                 toString(xsd::AudioContentType::AUDIO_CONTENT_TYPE_MUSIC),
+                {},
+                toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO),
                 1 /* gain */ } }};
 #endif
 };
@@ -971,7 +975,7 @@
         ASSERT_NO_FATAL_FAILURE(OpenStreamTest::SetUp());  // setup base
 #if MAJOR_VERSION <= 6
         address.device = AudioDevice::IN_DEFAULT;
-#elif MAJOR_VERSION <= 7
+#elif MAJOR_VERSION >= 7
         address.deviceType = toString(xsd::AudioDevice::AUDIO_DEVICE_IN_DEFAULT);
 #endif
         const AudioConfig& config = getConfig();
@@ -986,12 +990,15 @@
 
    protected:
 #if MAJOR_VERSION == 2
-    const AudioSource initMetadata = AudioSource::DEFAULT;
+     const AudioSource initMetadata = AudioSource::DEFAULT;
 #elif MAJOR_VERSION >= 4 && MAJOR_VERSION <= 6
      const SinkMetadata initMetadata = {{ {.source = AudioSource::DEFAULT, .gain = 1 } }};
 #elif MAJOR_VERSION >= 7
      const SinkMetadata initMetadata = {
-             {{.source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT), .gain = 1}}};
+             {{.source = toString(xsd::AudioSource::AUDIO_SOURCE_DEFAULT),
+               .gain = 1,
+               .tags = {},
+               .channelMask = toString(xsd::AudioChannelMask::AUDIO_CHANNEL_IN_MONO)}}};
 #endif
 };
 
diff --git a/audio/effect/all-versions/vts/functional/VtsHalAudioEffectTargetTest.cpp b/audio/effect/all-versions/vts/functional/VtsHalAudioEffectTargetTest.cpp
index d39fbcd..35ff869 100644
--- a/audio/effect/all-versions/vts/functional/VtsHalAudioEffectTargetTest.cpp
+++ b/audio/effect/all-versions/vts/functional/VtsHalAudioEffectTargetTest.cpp
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <vector>
+
 #define LOG_TAG "AudioEffectHidlHalTest"
 #include <android-base/logging.h>
 #if MAJOR_VERSION <= 6
@@ -309,6 +311,47 @@
     EXPECT_EQ(Result::OK, ret2);
 }
 
+#if MAJOR_VERSION >= 7
+std::vector<EffectBufferConfig> generateInvalidConfigs(const EffectBufferConfig& src) {
+    std::vector<EffectBufferConfig> result;
+    EffectBufferConfig invalidFormat = src;
+    invalidFormat.base.format = "random_string";
+    result.push_back(std::move(invalidFormat));
+    EffectBufferConfig invalidChannelMask = src;
+    invalidChannelMask.base.channelMask = "random_string";
+    result.push_back(std::move(invalidChannelMask));
+    return result;
+}
+
+TEST_P(AudioEffectHidlTest, SetConfigInvalidArguments) {
+    description("Verify that invalid arguments are rejected by SetConfig");
+    Result retval = Result::NOT_INITIALIZED;
+    EffectConfig currentConfig;
+    Return<void> ret = effect->getConfig([&](Result r, const EffectConfig& conf) {
+        retval = r;
+        if (r == Result::OK) {
+            currentConfig = conf;
+        }
+    });
+    EXPECT_TRUE(ret.isOk());
+    EXPECT_EQ(Result::OK, retval);
+    for (const auto& invalidInputCfg : generateInvalidConfigs(currentConfig.inputCfg)) {
+        EffectConfig invalidConfig = currentConfig;
+        invalidConfig.inputCfg = invalidInputCfg;
+        Return<Result> ret = effect->setConfig(invalidConfig, nullptr, nullptr);
+        EXPECT_TRUE(ret.isOk());
+        EXPECT_EQ(Result::INVALID_ARGUMENTS, ret);
+    }
+    for (const auto& invalidOutputCfg : generateInvalidConfigs(currentConfig.outputCfg)) {
+        EffectConfig invalidConfig = currentConfig;
+        invalidConfig.outputCfg = invalidOutputCfg;
+        Return<Result> ret = effect->setConfig(invalidConfig, nullptr, nullptr);
+        EXPECT_TRUE(ret.isOk());
+        EXPECT_EQ(Result::INVALID_ARGUMENTS, ret);
+    }
+}
+#endif
+
 TEST_P(AudioEffectHidlTest, GetConfigReverse) {
     description("Verify that GetConfigReverse does not crash");
     Return<void> ret = effect->getConfigReverse([&](Result, const EffectConfig&) {});
@@ -413,6 +456,16 @@
     EXPECT_EQ(Result::OK, ret);
 }
 
+#if MAJOR_VERSION >= 7
+TEST_P(AudioEffectHidlTest, SetDeviceInvalidDeviceAddress) {
+    description("Verify that invalid device address is rejected by SetDevice");
+    DeviceAddress device{.deviceType = "random_string"};
+    Return<Result> ret = effect->setDevice(device);
+    EXPECT_TRUE(ret.isOk());
+    EXPECT_EQ(Result::INVALID_ARGUMENTS, ret);
+}
+#endif
+
 TEST_P(AudioEffectHidlTest, SetDevice) {
     description("Verify that SetDevice works for an output chain effect");
 #if MAJOR_VERSION <= 6
@@ -468,6 +521,17 @@
     EXPECT_TRUE(ret.isOk());
 }
 
+#if MAJOR_VERSION >= 7
+TEST_P(AudioEffectHidlTest, SetInputDeviceInvalidDeviceAddress) {
+    description("Verify that invalid device address is rejected by SetInputDevice");
+    DeviceAddress device{.deviceType = "random_string"};
+    Return<Result> ret = effect->setInputDevice(device);
+    EXPECT_TRUE(ret.isOk());
+    EXPECT_TRUE(ret == Result::INVALID_ARGUMENTS || ret == Result::NOT_SUPPORTED)
+            << ::testing::PrintToString(ret);
+}
+#endif
+
 TEST_P(AudioEffectHidlTest, SetInputDevice) {
     description("Verify that SetInputDevice does not crash");
 #if MAJOR_VERSION <= 6
@@ -479,6 +543,16 @@
     EXPECT_TRUE(ret.isOk());
 }
 
+#if MAJOR_VERSION >= 7
+TEST_P(AudioEffectHidlTest, SetInvalidAudioSource) {
+    description("Verify that an invalid audio source is rejected by SetAudioSource");
+    Return<Result> ret = effect->setAudioSource("random_string");
+    ASSERT_TRUE(ret.isOk());
+    EXPECT_TRUE(ret == Result::INVALID_ARGUMENTS || ret == Result::NOT_SUPPORTED)
+            << ::testing::PrintToString(ret);
+}
+#endif
+
 TEST_P(AudioEffectHidlTest, SetAudioSource) {
     description("Verify that SetAudioSource does not crash");
 #if MAJOR_VERSION <= 6
diff --git a/authsecret/aidl/Android.bp b/authsecret/aidl/Android.bp
new file mode 100644
index 0000000..0a05034
--- /dev/null
+++ b/authsecret/aidl/Android.bp
@@ -0,0 +1,16 @@
+aidl_interface {
+    name: "android.hardware.authsecret",
+    vendor_available: true,
+    srcs: ["android/hardware/authsecret/*.aidl"],
+    stability: "vintf",
+    backend: {
+        java: {
+            platform_apis: true,
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+    },
+}
diff --git a/authsecret/aidl/aidl_api/android.hardware.authsecret/current/android/hardware/authsecret/IAuthSecret.aidl b/authsecret/aidl/aidl_api/android.hardware.authsecret/current/android/hardware/authsecret/IAuthSecret.aidl
new file mode 100644
index 0000000..14e8325
--- /dev/null
+++ b/authsecret/aidl/aidl_api/android.hardware.authsecret/current/android/hardware/authsecret/IAuthSecret.aidl
@@ -0,0 +1,23 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.authsecret;
+@VintfStability
+interface IAuthSecret {
+  oneway void setPrimaryUserCredential(in byte[] secret);
+}
diff --git a/authsecret/aidl/android/hardware/authsecret/IAuthSecret.aidl b/authsecret/aidl/android/hardware/authsecret/IAuthSecret.aidl
new file mode 100644
index 0000000..3849ec0
--- /dev/null
+++ b/authsecret/aidl/android/hardware/authsecret/IAuthSecret.aidl
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.authsecret;
+
+/**
+ * This security HAL allows vendor components to be cryptographically tied to
+ * the primary user's credential. For example, security hardware can require
+ * proof that the credential is known before applying updates.
+ *
+ */
+@VintfStability
+interface IAuthSecret {
+    /**
+     * When the primary user is unlocked, this method is passed a secret to
+     * prove that is has been successfully unlocked. The primary user can either
+     * be unlocked by a person entering their credential or by another party
+     * using an escrow token e.g. a device administrator.
+     *
+     * The first time this is called, the secret must be used to provision state
+     * that depends on the primary user's secret. The same secret must be passed
+     * on each call until the next factory reset.
+     *
+     * Upon factory reset, any dependence on the secret must be removed as that
+     * secret is now lost and must never be derived again. A new secret must be
+     * created for the new primary user which must be used to newly provision
+     * state the first time this method is called after factory reset.
+     *
+     * The secret must be at least 16 bytes, or the secret must be dropped.
+     *
+     * @param secret blob derived from the primary user's credential.
+     */
+    oneway void setPrimaryUserCredential(in byte[] secret);
+}
diff --git a/authsecret/aidl/default/Android.bp b/authsecret/aidl/default/Android.bp
new file mode 100644
index 0000000..d598344
--- /dev/null
+++ b/authsecret/aidl/default/Android.bp
@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_binary {
+    name: "android.hardware.authsecret-service.example",
+    relative_install_path: "hw",
+    init_rc: ["android.hardware.authsecret-service.example.rc"],
+    vintf_fragments: ["android.hardware.authsecret-service.example.xml"],
+    vendor: true,
+    srcs: [
+        "service.cpp",
+        "AuthSecret.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.authsecret-ndk_platform",
+        "libbase",
+        "libbinder_ndk",
+    ],
+}
diff --git a/authsecret/aidl/default/AuthSecret.cpp b/authsecret/aidl/default/AuthSecret.cpp
new file mode 100644
index 0000000..9645e4d
--- /dev/null
+++ b/authsecret/aidl/default/AuthSecret.cpp
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AuthSecret.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace authsecret {
+
+// Methods from ::android::hardware::authsecret::IAuthSecret follow.
+::ndk::ScopedAStatus AuthSecret::setPrimaryUserCredential(const std::vector<uint8_t>& in_secret) {
+    (void)in_secret;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+} // namespace authsecret
+} // namespace hardware
+} // namespace android
+} // aidl
diff --git a/authsecret/aidl/default/AuthSecret.h b/authsecret/aidl/default/AuthSecret.h
new file mode 100644
index 0000000..b40fc48
--- /dev/null
+++ b/authsecret/aidl/default/AuthSecret.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/authsecret/BnAuthSecret.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace authsecret {
+
+struct AuthSecret : public BnAuthSecret {
+    AuthSecret() = default;
+
+    // Methods from ::android::hardware::authsecret::IAuthSecret follow.
+    ::ndk::ScopedAStatus setPrimaryUserCredential(const std::vector<uint8_t>& in_secret) override;
+
+};
+
+} // namespace authsecret
+} // namespace hardware
+} // namespace android
+} // aidl
diff --git a/authsecret/aidl/default/android.hardware.authsecret-service.example.rc b/authsecret/aidl/default/android.hardware.authsecret-service.example.rc
new file mode 100644
index 0000000..fef6e24
--- /dev/null
+++ b/authsecret/aidl/default/android.hardware.authsecret-service.example.rc
@@ -0,0 +1,4 @@
+service vendor.authsecret_default /vendor/bin/hw/android.hardware.authsecret-service.example
+    class hal
+    user hsm
+    group hsm
diff --git a/authsecret/aidl/default/android.hardware.authsecret-service.example.xml b/authsecret/aidl/default/android.hardware.authsecret-service.example.xml
new file mode 100644
index 0000000..9d4e162
--- /dev/null
+++ b/authsecret/aidl/default/android.hardware.authsecret-service.example.xml
@@ -0,0 +1,10 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.authsecret</name>
+        <version>1</version>
+        <interface>
+            <name>IAuthSecret</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>
diff --git a/authsecret/aidl/default/service.cpp b/authsecret/aidl/default/service.cpp
new file mode 100644
index 0000000..efecf10
--- /dev/null
+++ b/authsecret/aidl/default/service.cpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+#include "AuthSecret.h"
+
+using ::aidl::android::hardware::authsecret::AuthSecret;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<AuthSecret> authsecret = ndk::SharedRefBase::make<AuthSecret>();
+
+    const std::string instance = std::string() + AuthSecret::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(authsecret->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return -1; // Should never be reached
+}
diff --git a/authsecret/aidl/vts/Android.bp b/authsecret/aidl/vts/Android.bp
new file mode 100644
index 0000000..83a85b2
--- /dev/null
+++ b/authsecret/aidl/vts/Android.bp
@@ -0,0 +1,31 @@
+//
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_test {
+    name: "VtsHalAuthSecretTargetTest",
+    defaults: [
+        "VtsHalTargetTestDefaults",
+        "use_libaidlvintf_gtest_helper_static",
+    ],
+    srcs: ["VtsHalAuthSecretTargetTest.cpp"],
+    static_libs: ["android.hardware.authsecret-ndk_platform"],
+    shared_libs: ["libbinder_ndk"],
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+    require_root: true,
+}
diff --git a/authsecret/aidl/vts/VtsHalAuthSecretTargetTest.cpp b/authsecret/aidl/vts/VtsHalAuthSecretTargetTest.cpp
new file mode 100644
index 0000000..31c2834
--- /dev/null
+++ b/authsecret/aidl/vts/VtsHalAuthSecretTargetTest.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <aidl/Gtest.h>
+#include <aidl/Vintf.h>
+
+#include <aidl/android/hardware/authsecret/IAuthSecret.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::aidl::android::hardware::authsecret::IAuthSecret;
+
+using ::ndk::SpAIBinder;
+
+/**
+ * There is no expected behaviour that can be tested so these tests check the
+ * HAL doesn't crash with different execution orders.
+ */
+class AuthSecretAidlTest : public testing::TestWithParam<std::string> {
+  public:
+    virtual void SetUp() override {
+        authsecret = IAuthSecret::fromBinder(
+            SpAIBinder(AServiceManager_waitForService(GetParam().c_str())));
+        ASSERT_NE(authsecret, nullptr);
+
+        // Notify LSS to generate PIN code '1234' and corresponding secret.
+        (void)system("cmd lock_settings set-pin 1234");
+
+        // All tests must enroll the correct secret first as this cannot be changed
+        // without a factory reset and the order of tests could change.
+        authsecret->setPrimaryUserCredential(CORRECT_SECRET);
+    }
+
+    static void TearDownTestSuite() {
+        // clean up PIN code after testing
+        (void)system("cmd lock_settings clear --old 1234");
+    }
+
+    std::shared_ptr<IAuthSecret> authsecret;
+    std::vector<uint8_t> CORRECT_SECRET{61, 93, 124, 240, 5, 0, 7, 201, 9, 129, 11, 12, 0, 14, 0, 16};
+    std::vector<uint8_t> WRONG_SECRET{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
+};
+
+/* Provision the primary user with a secret. */
+TEST_P(AuthSecretAidlTest, provisionPrimaryUserCredential) {
+    // Secret provisioned by SetUp()
+}
+
+/* Provision the primary user with a secret and pass the secret again. */
+TEST_P(AuthSecretAidlTest, provisionPrimaryUserCredentialAndPassAgain) {
+    // Secret provisioned by SetUp()
+    authsecret->setPrimaryUserCredential(CORRECT_SECRET);
+}
+
+/* Provision the primary user with a secret and pass the secret again repeatedly. */
+TEST_P(AuthSecretAidlTest, provisionPrimaryUserCredentialAndPassAgainMultipleTimes) {
+    // Secret provisioned by SetUp()
+    constexpr int N = 5;
+    for (int i = 0; i < N; ++i) {
+        authsecret->setPrimaryUserCredential(CORRECT_SECRET);
+    }
+}
+
+/* Provision the primary user with a secret and then pass the wrong secret. This
+ * should never happen and is an framework bug if it does. As the secret is
+ * wrong, the HAL implementation may not be able to function correctly but it
+ * should fail gracefully. */
+TEST_P(AuthSecretAidlTest, provisionPrimaryUserCredentialAndWrongSecret) {
+    // Secret provisioned by SetUp()
+    authsecret->setPrimaryUserCredential(WRONG_SECRET);
+}
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(AuthSecretAidlTest);
+INSTANTIATE_TEST_SUITE_P(
+        PerInstance, AuthSecretAidlTest,
+        testing::ValuesIn(android::getAidlHalInstanceNames(IAuthSecret::descriptor)),
+        android::PrintInstanceNameToString);
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    ABinderProcess_setThreadPoolMaxThreadCount(1);
+    ABinderProcess_startThreadPool();
+    return RUN_ALL_TESTS();
+}
diff --git a/bluetooth/audio/2.1/default/LeAudioAudioProvider.cpp b/bluetooth/audio/2.1/default/LeAudioAudioProvider.cpp
index 1fa2dce..9c2b4fe 100644
--- a/bluetooth/audio/2.1/default/LeAudioAudioProvider.cpp
+++ b/bluetooth/audio/2.1/default/LeAudioAudioProvider.cpp
@@ -91,35 +91,30 @@
 
   uint32_t kDataMqSize = 0;
   switch (audioConfig.pcmConfig().sampleRate) {
+    case SampleRate::RATE_8000:
+      kDataMqSize = 8000;
+      break;
     case SampleRate::RATE_16000:
       kDataMqSize = 16000;
       break;
     case SampleRate::RATE_24000:
       kDataMqSize = 24000;
       break;
+    case SampleRate::RATE_32000:
+      kDataMqSize = 32000;
+      break;
     case SampleRate::RATE_44100:
       kDataMqSize = 44100;
       break;
     case SampleRate::RATE_48000:
       kDataMqSize = 48000;
       break;
-    case SampleRate::RATE_88200:
-      kDataMqSize = 88200;
-      break;
-    case SampleRate::RATE_96000:
-      kDataMqSize = 96000;
-      break;
-    case SampleRate::RATE_176400:
-      kDataMqSize = 176400;
-      break;
-    case SampleRate::RATE_192000:
-      kDataMqSize = 192000;
-      break;
     default:
-      /* This should never happen it would be caught while validating
-       * parameters.
-       */
-      break;
+      LOG(WARNING) << __func__ << " - Unsupported sampling frequency="
+                   << toString(audioConfig.pcmConfig());
+      _hidl_cb(BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION,
+               DataMQ::Descriptor());
+      return Void();
   }
 
   /* Number of samples per millisecond */
diff --git a/bluetooth/audio/2.1/default/session/BluetoothAudioSupportedCodecsDB.cpp b/bluetooth/audio/2.1/default/session/BluetoothAudioSupportedCodecsDB.cpp
index d15db49..0937f44 100644
--- a/bluetooth/audio/2.1/default/session/BluetoothAudioSupportedCodecsDB.cpp
+++ b/bluetooth/audio/2.1/default/session/BluetoothAudioSupportedCodecsDB.cpp
@@ -409,12 +409,14 @@
 }
 
 bool IsSoftwarePcmConfigurationValid_2_1(const PcmParameters& pcm_config) {
-  if ((pcm_config.sampleRate != SampleRate::RATE_44100 &&
-       pcm_config.sampleRate != SampleRate::RATE_48000 &&
+  if ((pcm_config.sampleRate != SampleRate::RATE_96000 &&
        pcm_config.sampleRate != SampleRate::RATE_88200 &&
-       pcm_config.sampleRate != SampleRate::RATE_96000 &&
+       pcm_config.sampleRate != SampleRate::RATE_48000 &&
+       pcm_config.sampleRate != SampleRate::RATE_44100 &&
+       pcm_config.sampleRate != SampleRate::RATE_32000 &&
+       pcm_config.sampleRate != SampleRate::RATE_24000 &&
        pcm_config.sampleRate != SampleRate::RATE_16000 &&
-       pcm_config.sampleRate != SampleRate::RATE_24000) ||
+       pcm_config.sampleRate != SampleRate::RATE_8000) ||
       (pcm_config.bitsPerSample != BitsPerSample::BITS_16 &&
        pcm_config.bitsPerSample != BitsPerSample::BITS_24 &&
        pcm_config.bitsPerSample != BitsPerSample::BITS_32) ||
diff --git a/bluetooth/audio/2.1/vts/functional/VtsHalBluetoothAudioV2_1TargetTest.cpp b/bluetooth/audio/2.1/vts/functional/VtsHalBluetoothAudioV2_1TargetTest.cpp
index 37d1281..95903d1 100644
--- a/bluetooth/audio/2.1/vts/functional/VtsHalBluetoothAudioV2_1TargetTest.cpp
+++ b/bluetooth/audio/2.1/vts/functional/VtsHalBluetoothAudioV2_1TargetTest.cpp
@@ -1005,8 +1005,10 @@
     BluetoothAudioProvidersFactoryHidlTest::TearDown();
   }
 
-  static constexpr SampleRate le_audio_output_sample_rates_[3] = {
-      SampleRate::RATE_UNKNOWN, SampleRate::RATE_16000, SampleRate::RATE_24000};
+  static constexpr SampleRate le_audio_output_sample_rates_[11] = {
+      SampleRate::RATE_UNKNOWN, SampleRate::RATE_8000,  SampleRate::RATE_16000,
+      SampleRate::RATE_24000,   SampleRate::RATE_32000, SampleRate::RATE_44100,
+      SampleRate::RATE_48000};
   static constexpr BitsPerSample le_audio_output_bits_per_samples_[3] = {
       BitsPerSample::BITS_UNKNOWN, BitsPerSample::BITS_16,
       BitsPerSample::BITS_24};
@@ -1097,8 +1099,10 @@
     BluetoothAudioProvidersFactoryHidlTest::TearDown();
   }
 
-  static constexpr SampleRate le_audio_output_sample_rates_[3] = {
-      SampleRate::RATE_UNKNOWN, SampleRate::RATE_16000, SampleRate::RATE_24000};
+  static constexpr SampleRate le_audio_output_sample_rates_[11] = {
+      SampleRate::RATE_UNKNOWN, SampleRate::RATE_8000,  SampleRate::RATE_16000,
+      SampleRate::RATE_24000,   SampleRate::RATE_32000, SampleRate::RATE_44100,
+      SampleRate::RATE_48000};
   static constexpr BitsPerSample le_audio_output_bits_per_samples_[3] = {
       BitsPerSample::BITS_UNKNOWN, BitsPerSample::BITS_16,
       BitsPerSample::BITS_24};
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 451eff4..d39e339 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -27,6 +27,14 @@
             <instance>default</instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="true">
+         <name>android.hardware.authsecret</name>
+         <version>1</version>
+         <interface>
+             <name>IAuthSecret</name>
+             <instance>default</instance>
+         </interface>
+    </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.authsecret</name>
         <version>1.0</version>
@@ -260,11 +268,20 @@
     </hal>
     <hal format="aidl" optional="true">
         <name>android.hardware.identity</name>
+        <version>1-2</version>
         <interface>
             <name>IIdentityCredentialStore</name>
             <instance>default</instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="true">
+        <name>android.hardware.oemlock</name>
+        <version>1</version>
+        <interface>
+            <name>IOemLock</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.ir</name>
         <version>1.0</version>
@@ -441,6 +458,20 @@
             <regex-instance>SIM[1-9][0-9]*</regex-instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="true">
+        <name>android.hardware.security.secureclock</name>
+        <interface>
+            <name>ISecureClock</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+    <hal format="aidl" optional="true">
+        <name>android.hardware.security.sharedsecret</name>
+        <interface>
+            <name>ISharedSecret</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.sensors</name>
         <version>1.0</version>
diff --git a/identity/aidl/default/Android.bp b/identity/aidl/default/Android.bp
index 2eb0faa..7f342d0 100644
--- a/identity/aidl/default/Android.bp
+++ b/identity/aidl/default/Android.bp
@@ -1,3 +1,67 @@
+cc_library_static {
+    name: "android.hardware.identity-libeic-hal-common",
+    vendor_available: true,
+    srcs: [
+        "common/IdentityCredential.cpp",
+        "common/IdentityCredentialStore.cpp",
+        "common/WritableIdentityCredential.cpp",
+    ],
+    export_include_dirs: [
+        "common",
+    ],
+    cflags: [
+        "-Wall",
+        "-Wextra",
+    ],
+    shared_libs: [
+        "liblog",
+        "libcrypto",
+        "libbinder_ndk",
+        "libkeymaster_messages",
+    ],
+    static_libs: [
+        "libbase",
+        "libcppbor",
+        "libutils",
+        "libsoft_attestation_cert",
+        "libkeymaster_portable",
+        "libsoft_attestation_cert",
+        "libpuresoftkeymasterdevice",
+        "android.hardware.identity-support-lib",
+        "android.hardware.identity-ndk_platform",
+        "android.hardware.keymaster-ndk_platform",
+    ],
+}
+
+cc_library_static {
+    name: "android.hardware.identity-libeic-library",
+    vendor_available: true,
+    srcs: [
+        "libeic/EicCbor.c",
+        "libeic/EicPresentation.c",
+        "libeic/EicProvisioning.c",
+        "EicOpsImpl.cc",
+    ],
+    export_include_dirs: [
+        "libeic",
+    ],
+    cflags: [
+        "-DEIC_COMPILATION",
+        "-Wall",
+        "-Wextra",
+        "-DEIC_DEBUG",
+        // Allow using C2x extensions such as omitting parameter names
+        "-Wno-c2x-extensions",
+    ],
+    shared_libs: [
+        "libbase",
+        "libcrypto",
+    ],
+    static_libs: [
+        "android.hardware.identity-support-lib",
+    ],
+}
+
 cc_binary {
     name: "android.hardware.identity-service.example",
     relative_install_path: "hw",
@@ -7,23 +71,30 @@
     cflags: [
         "-Wall",
         "-Wextra",
+        "-g",
     ],
     shared_libs: [
-        "libbase",
-        "libbinder_ndk",
-        "libcppbor",
-        "libcrypto",
         "liblog",
+        "libcrypto",
+        "libbinder_ndk",
+        "libkeymaster_messages",
+    ],
+    static_libs: [
+        "libbase",
+        "libcppbor",
         "libutils",
+        "libsoft_attestation_cert",
+        "libkeymaster_portable",
+        "libsoft_attestation_cert",
+        "libpuresoftkeymasterdevice",
         "android.hardware.identity-support-lib",
         "android.hardware.identity-ndk_platform",
         "android.hardware.keymaster-ndk_platform",
+        "android.hardware.identity-libeic-hal-common",
+        "android.hardware.identity-libeic-library",
     ],
     srcs: [
-        "IdentityCredential.cpp",
-        "IdentityCredentialStore.cpp",
-        "WritableIdentityCredential.cpp",
-        "Util.cpp",
         "service.cpp",
+        "FakeSecureHardwareProxy.cpp",
     ],
 }
diff --git a/identity/aidl/default/EicOpsImpl.cc b/identity/aidl/default/EicOpsImpl.cc
new file mode 100644
index 0000000..3f2ec8b
--- /dev/null
+++ b/identity/aidl/default/EicOpsImpl.cc
@@ -0,0 +1,506 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "EicOpsImpl"
+
+#include <optional>
+#include <tuple>
+#include <vector>
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <string.h>
+
+#include <android/hardware/identity/support/IdentityCredentialSupport.h>
+
+#include <openssl/sha.h>
+
+#include <openssl/aes.h>
+#include <openssl/bn.h>
+#include <openssl/crypto.h>
+#include <openssl/ec.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/hkdf.h>
+#include <openssl/hmac.h>
+#include <openssl/objects.h>
+#include <openssl/pem.h>
+#include <openssl/pkcs12.h>
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+#include <openssl/x509_vfy.h>
+
+#include "EicOps.h"
+
+using ::std::optional;
+using ::std::string;
+using ::std::tuple;
+using ::std::vector;
+
+void* eicMemSet(void* s, int c, size_t n) {
+    return memset(s, c, n);
+}
+
+void* eicMemCpy(void* dest, const void* src, size_t n) {
+    return memcpy(dest, src, n);
+}
+
+size_t eicStrLen(const char* s) {
+    return strlen(s);
+}
+
+int eicCryptoMemCmp(const void* s1, const void* s2, size_t n) {
+    return CRYPTO_memcmp(s1, s2, n);
+}
+
+void eicOpsHmacSha256Init(EicHmacSha256Ctx* ctx, const uint8_t* key, size_t keySize) {
+    HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
+    HMAC_CTX_init(realCtx);
+    if (HMAC_Init_ex(realCtx, key, keySize, EVP_sha256(), nullptr /* impl */) != 1) {
+        LOG(ERROR) << "Error initializing HMAC_CTX";
+    }
+}
+
+void eicOpsHmacSha256Update(EicHmacSha256Ctx* ctx, const uint8_t* data, size_t len) {
+    HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
+    if (HMAC_Update(realCtx, data, len) != 1) {
+        LOG(ERROR) << "Error updating HMAC_CTX";
+    }
+}
+
+void eicOpsHmacSha256Final(EicHmacSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]) {
+    HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
+    unsigned int size = 0;
+    if (HMAC_Final(realCtx, digest, &size) != 1) {
+        LOG(ERROR) << "Error finalizing HMAC_CTX";
+    }
+    if (size != EIC_SHA256_DIGEST_SIZE) {
+        LOG(ERROR) << "Expected 32 bytes from HMAC_Final, got " << size;
+    }
+}
+
+void eicOpsSha256Init(EicSha256Ctx* ctx) {
+    SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
+    SHA256_Init(realCtx);
+}
+
+void eicOpsSha256Update(EicSha256Ctx* ctx, const uint8_t* data, size_t len) {
+    SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
+    SHA256_Update(realCtx, data, len);
+}
+
+void eicOpsSha256Final(EicSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]) {
+    SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
+    SHA256_Final(digest, realCtx);
+}
+
+bool eicOpsRandom(uint8_t* buf, size_t numBytes) {
+    optional<vector<uint8_t>> bytes = ::android::hardware::identity::support::getRandom(numBytes);
+    if (!bytes.has_value()) {
+        return false;
+    }
+    memcpy(buf, bytes.value().data(), numBytes);
+    return true;
+}
+
+bool eicOpsEncryptAes128Gcm(
+        const uint8_t* key,    // Must be 16 bytes
+        const uint8_t* nonce,  // Must be 12 bytes
+        const uint8_t* data,   // May be NULL if size is 0
+        size_t dataSize,
+        const uint8_t* additionalAuthenticationData,  // May be NULL if size is 0
+        size_t additionalAuthenticationDataSize, uint8_t* encryptedData) {
+    vector<uint8_t> cppKey;
+    cppKey.resize(16);
+    memcpy(cppKey.data(), key, 16);
+
+    vector<uint8_t> cppData;
+    cppData.resize(dataSize);
+    if (dataSize > 0) {
+        memcpy(cppData.data(), data, dataSize);
+    }
+
+    vector<uint8_t> cppAAD;
+    cppAAD.resize(additionalAuthenticationDataSize);
+    if (additionalAuthenticationDataSize > 0) {
+        memcpy(cppAAD.data(), additionalAuthenticationData, additionalAuthenticationDataSize);
+    }
+
+    vector<uint8_t> cppNonce;
+    cppNonce.resize(12);
+    memcpy(cppNonce.data(), nonce, 12);
+
+    optional<vector<uint8_t>> cppEncryptedData =
+            android::hardware::identity::support::encryptAes128Gcm(cppKey, cppNonce, cppData,
+                                                                   cppAAD);
+    if (!cppEncryptedData.has_value()) {
+        return false;
+    }
+
+    memcpy(encryptedData, cppEncryptedData.value().data(), cppEncryptedData.value().size());
+    return true;
+}
+
+// Decrypts |encryptedData| using |key| and |additionalAuthenticatedData|,
+// returns resulting plaintext in |data| must be of size |encryptedDataSize| - 28.
+//
+// The format of |encryptedData| must be as specified in the
+// encryptAes128Gcm() function.
+bool eicOpsDecryptAes128Gcm(const uint8_t* key,  // Must be 16 bytes
+                            const uint8_t* encryptedData, size_t encryptedDataSize,
+                            const uint8_t* additionalAuthenticationData,
+                            size_t additionalAuthenticationDataSize, uint8_t* data) {
+    vector<uint8_t> keyVec;
+    keyVec.resize(16);
+    memcpy(keyVec.data(), key, 16);
+
+    vector<uint8_t> encryptedDataVec;
+    encryptedDataVec.resize(encryptedDataSize);
+    if (encryptedDataSize > 0) {
+        memcpy(encryptedDataVec.data(), encryptedData, encryptedDataSize);
+    }
+
+    vector<uint8_t> aadVec;
+    aadVec.resize(additionalAuthenticationDataSize);
+    if (additionalAuthenticationDataSize > 0) {
+        memcpy(aadVec.data(), additionalAuthenticationData, additionalAuthenticationDataSize);
+    }
+
+    optional<vector<uint8_t>> decryptedDataVec =
+            android::hardware::identity::support::decryptAes128Gcm(keyVec, encryptedDataVec,
+                                                                   aadVec);
+    if (!decryptedDataVec.has_value()) {
+        eicDebug("Error decrypting data");
+        return false;
+    }
+    if (decryptedDataVec.value().size() != encryptedDataSize - 28) {
+        eicDebug("Decrypted data is size %zd, expected %zd", decryptedDataVec.value().size(),
+                 encryptedDataSize - 28);
+        return false;
+    }
+
+    if (decryptedDataVec.value().size() > 0) {
+        memcpy(data, decryptedDataVec.value().data(), decryptedDataVec.value().size());
+    }
+    return true;
+}
+
+bool eicOpsCreateEcKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
+                       uint8_t publicKey[EIC_P256_PUB_KEY_SIZE]) {
+    optional<vector<uint8_t>> keyPair = android::hardware::identity::support::createEcKeyPair();
+    if (!keyPair) {
+        eicDebug("Error creating EC keypair");
+        return false;
+    }
+    optional<vector<uint8_t>> privKey =
+            android::hardware::identity::support::ecKeyPairGetPrivateKey(keyPair.value());
+    if (!privKey) {
+        eicDebug("Error extracting private key");
+        return false;
+    }
+    if (privKey.value().size() != EIC_P256_PRIV_KEY_SIZE) {
+        eicDebug("Private key is not %zd bytes long as expected", (size_t)EIC_P256_PRIV_KEY_SIZE);
+        return false;
+    }
+
+    optional<vector<uint8_t>> pubKey =
+            android::hardware::identity::support::ecKeyPairGetPublicKey(keyPair.value());
+    if (!pubKey) {
+        eicDebug("Error extracting public key");
+        return false;
+    }
+    // ecKeyPairGetPublicKey() returns 0x04 | x | y, we don't want the leading 0x04.
+    if (pubKey.value().size() != EIC_P256_PUB_KEY_SIZE + 1) {
+        eicDebug("Private key is %zd bytes long, expected %zd", pubKey.value().size(),
+                 (size_t)EIC_P256_PRIV_KEY_SIZE + 1);
+        return false;
+    }
+
+    memcpy(privateKey, privKey.value().data(), EIC_P256_PRIV_KEY_SIZE);
+    memcpy(publicKey, pubKey.value().data() + 1, EIC_P256_PUB_KEY_SIZE);
+
+    return true;
+}
+
+bool eicOpsCreateCredentialKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE], const uint8_t* challenge,
+                               size_t challengeSize, const uint8_t* applicationId,
+                               size_t applicationIdSize, bool testCredential, uint8_t* cert,
+                               size_t* certSize) {
+    vector<uint8_t> challengeVec(challengeSize);
+    memcpy(challengeVec.data(), challenge, challengeSize);
+
+    vector<uint8_t> applicationIdVec(applicationIdSize);
+    memcpy(applicationIdVec.data(), applicationId, applicationIdSize);
+
+    optional<std::pair<vector<uint8_t>, vector<vector<uint8_t>>>> ret =
+            android::hardware::identity::support::createEcKeyPairAndAttestation(
+                    challengeVec, applicationIdVec, testCredential);
+    if (!ret) {
+        eicDebug("Error generating CredentialKey and attestation");
+        return false;
+    }
+
+    // Extract certificate chain.
+    vector<uint8_t> flatChain =
+            android::hardware::identity::support::certificateChainJoin(ret.value().second);
+    if (*certSize < flatChain.size()) {
+        eicDebug("Buffer for certificate is only %zd bytes long, need %zd bytes", *certSize,
+                 flatChain.size());
+        return false;
+    }
+    memcpy(cert, flatChain.data(), flatChain.size());
+    *certSize = flatChain.size();
+
+    // Extract private key.
+    optional<vector<uint8_t>> privKey =
+            android::hardware::identity::support::ecKeyPairGetPrivateKey(ret.value().first);
+    if (!privKey) {
+        eicDebug("Error extracting private key");
+        return false;
+    }
+    if (privKey.value().size() != EIC_P256_PRIV_KEY_SIZE) {
+        eicDebug("Private key is not %zd bytes long as expected", (size_t)EIC_P256_PRIV_KEY_SIZE);
+        return false;
+    }
+
+    memcpy(privateKey, privKey.value().data(), EIC_P256_PRIV_KEY_SIZE);
+
+    return true;
+}
+
+bool eicOpsSignEcKey(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
+                     const uint8_t signingKey[EIC_P256_PRIV_KEY_SIZE], unsigned int serial,
+                     const char* issuerName, const char* subjectName, time_t validityNotBefore,
+                     time_t validityNotAfter, uint8_t* cert,
+                     size_t* certSize) {  // inout
+    vector<uint8_t> signingKeyVec(EIC_P256_PRIV_KEY_SIZE);
+    memcpy(signingKeyVec.data(), signingKey, EIC_P256_PRIV_KEY_SIZE);
+
+    vector<uint8_t> pubKeyVec(EIC_P256_PUB_KEY_SIZE + 1);
+    pubKeyVec[0] = 0x04;
+    memcpy(pubKeyVec.data() + 1, publicKey, EIC_P256_PUB_KEY_SIZE);
+
+    std::string serialDecimal = android::base::StringPrintf("%d", serial);
+
+    optional<vector<uint8_t>> certVec =
+            android::hardware::identity::support::ecPublicKeyGenerateCertificate(
+                    pubKeyVec, signingKeyVec, serialDecimal, issuerName, subjectName,
+                    validityNotBefore, validityNotAfter);
+    if (!certVec) {
+        eicDebug("Error generating certificate");
+        return false;
+    }
+
+    if (*certSize < certVec.value().size()) {
+        eicDebug("Buffer for certificate is only %zd bytes long, need %zd bytes", *certSize,
+                 certVec.value().size());
+        return false;
+    }
+    memcpy(cert, certVec.value().data(), certVec.value().size());
+    *certSize = certVec.value().size();
+
+    return true;
+}
+
+bool eicOpsEcDsa(const uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
+                 const uint8_t digestOfData[EIC_SHA256_DIGEST_SIZE],
+                 uint8_t signature[EIC_ECDSA_P256_SIGNATURE_SIZE]) {
+    vector<uint8_t> privKeyVec(EIC_P256_PRIV_KEY_SIZE);
+    memcpy(privKeyVec.data(), privateKey, EIC_P256_PRIV_KEY_SIZE);
+
+    vector<uint8_t> digestVec(EIC_SHA256_DIGEST_SIZE);
+    memcpy(digestVec.data(), digestOfData, EIC_SHA256_DIGEST_SIZE);
+
+    optional<vector<uint8_t>> derSignature =
+            android::hardware::identity::support::signEcDsaDigest(privKeyVec, digestVec);
+    if (!derSignature) {
+        eicDebug("Error signing data");
+        return false;
+    }
+
+    ECDSA_SIG* sig;
+    const unsigned char* p = derSignature.value().data();
+    sig = d2i_ECDSA_SIG(nullptr, &p, derSignature.value().size());
+    if (sig == nullptr) {
+        eicDebug("Error decoding DER signature");
+        return false;
+    }
+
+    if (BN_bn2binpad(sig->r, signature, 32) != 32) {
+        eicDebug("Error encoding r");
+        return false;
+    }
+    if (BN_bn2binpad(sig->s, signature + 32, 32) != 32) {
+        eicDebug("Error encoding s");
+        return false;
+    }
+
+    return true;
+}
+
+static const uint8_t hbkTest[16] = {0};
+static const uint8_t hbkReal[16] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+
+const uint8_t* eicOpsGetHardwareBoundKey(bool testCredential) {
+    if (testCredential) {
+        return hbkTest;
+    }
+    return hbkReal;
+}
+
+bool eicOpsValidateAuthToken(uint64_t /* challenge */, uint64_t /* secureUserId */,
+                             uint64_t /* authenticatorId */, int /* hardwareAuthenticatorType */,
+                             uint64_t /* timeStamp */, const uint8_t* /* mac */,
+                             size_t /* macSize */, uint64_t /* verificationTokenChallenge */,
+                             uint64_t /* verificationTokenTimeStamp */,
+                             int /* verificationTokenSecurityLevel */,
+                             const uint8_t* /* verificationTokenMac */,
+                             size_t /* verificationTokenMacSize */) {
+    // Here's where we would validate the passed-in |authToken| to assure ourselves
+    // that it comes from the e.g. biometric hardware and wasn't made up by an attacker.
+    //
+    // However this involves calculating the MAC which requires access to the to
+    // a pre-shared key which we don't have...
+    //
+    return true;
+}
+
+bool eicOpsX509GetPublicKey(const uint8_t* x509Cert, size_t x509CertSize, uint8_t* publicKey,
+                            size_t* publicKeySize) {
+    vector<uint8_t> chain;
+    chain.resize(x509CertSize);
+    memcpy(chain.data(), x509Cert, x509CertSize);
+    optional<vector<uint8_t>> res =
+            android::hardware::identity::support::certificateChainGetTopMostKey(chain);
+    if (!res) {
+        return false;
+    }
+    if (res.value().size() > *publicKeySize) {
+        eicDebug("Public key size is %zd but buffer only has room for %zd bytes",
+                 res.value().size(), *publicKeySize);
+        return false;
+    }
+    *publicKeySize = res.value().size();
+    memcpy(publicKey, res.value().data(), *publicKeySize);
+    eicDebug("Extracted %zd bytes public key from %zd bytes X.509 cert", *publicKeySize,
+             x509CertSize);
+    return true;
+}
+
+bool eicOpsX509CertSignedByPublicKey(const uint8_t* x509Cert, size_t x509CertSize,
+                                     const uint8_t* publicKey, size_t publicKeySize) {
+    vector<uint8_t> certVec(x509Cert, x509Cert + x509CertSize);
+    vector<uint8_t> publicKeyVec(publicKey, publicKey + publicKeySize);
+    return android::hardware::identity::support::certificateSignedByPublicKey(certVec,
+                                                                              publicKeyVec);
+}
+
+bool eicOpsEcDsaVerifyWithPublicKey(const uint8_t* digest, size_t digestSize,
+                                    const uint8_t* signature, size_t signatureSize,
+                                    const uint8_t* publicKey, size_t publicKeySize) {
+    vector<uint8_t> digestVec(digest, digest + digestSize);
+    vector<uint8_t> signatureVec(signature, signature + signatureSize);
+    vector<uint8_t> publicKeyVec(publicKey, publicKey + publicKeySize);
+
+    vector<uint8_t> derSignature;
+    if (!android::hardware::identity::support::ecdsaSignatureCoseToDer(signatureVec,
+                                                                       derSignature)) {
+        LOG(ERROR) << "Error convering signature to DER format";
+        return false;
+    }
+
+    if (!android::hardware::identity::support::checkEcDsaSignature(digestVec, derSignature,
+                                                                   publicKeyVec)) {
+        LOG(ERROR) << "Signature check failed";
+        return false;
+    }
+    return true;
+}
+
+bool eicOpsEcdh(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
+                const uint8_t privateKey[EIC_P256_PUB_KEY_SIZE],
+                uint8_t sharedSecret[EIC_P256_COORDINATE_SIZE]) {
+    vector<uint8_t> pubKeyVec(EIC_P256_PUB_KEY_SIZE + 1);
+    pubKeyVec[0] = 0x04;
+    memcpy(pubKeyVec.data() + 1, publicKey, EIC_P256_PUB_KEY_SIZE);
+
+    vector<uint8_t> privKeyVec(EIC_P256_PRIV_KEY_SIZE);
+    memcpy(privKeyVec.data(), privateKey, EIC_P256_PRIV_KEY_SIZE);
+
+    optional<vector<uint8_t>> shared =
+            android::hardware::identity::support::ecdh(pubKeyVec, privKeyVec);
+    if (!shared) {
+        LOG(ERROR) << "Error performing ECDH";
+        return false;
+    }
+    if (shared.value().size() != EIC_P256_COORDINATE_SIZE) {
+        LOG(ERROR) << "Unexpected size of shared secret " << shared.value().size() << " expected "
+                   << EIC_P256_COORDINATE_SIZE << " bytes";
+        return false;
+    }
+    memcpy(sharedSecret, shared.value().data(), EIC_P256_COORDINATE_SIZE);
+    return true;
+}
+
+bool eicOpsHkdf(const uint8_t* sharedSecret, size_t sharedSecretSize, const uint8_t* salt,
+                size_t saltSize, const uint8_t* info, size_t infoSize, uint8_t* output,
+                size_t outputSize) {
+    vector<uint8_t> sharedSecretVec(sharedSecretSize);
+    memcpy(sharedSecretVec.data(), sharedSecret, sharedSecretSize);
+    vector<uint8_t> saltVec(saltSize);
+    memcpy(saltVec.data(), salt, saltSize);
+    vector<uint8_t> infoVec(infoSize);
+    memcpy(infoVec.data(), info, infoSize);
+
+    optional<vector<uint8_t>> result = android::hardware::identity::support::hkdf(
+            sharedSecretVec, saltVec, infoVec, outputSize);
+    if (!result) {
+        LOG(ERROR) << "Error performing HKDF";
+        return false;
+    }
+    if (result.value().size() != outputSize) {
+        LOG(ERROR) << "Unexpected size of HKDF " << result.value().size() << " expected "
+                   << outputSize;
+        return false;
+    }
+    memcpy(output, result.value().data(), outputSize);
+    return true;
+}
+
+#ifdef EIC_DEBUG
+
+void eicPrint(const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+}
+
+void eicHexdump(const char* message, const uint8_t* data, size_t dataSize) {
+    vector<uint8_t> dataVec(dataSize);
+    memcpy(dataVec.data(), data, dataSize);
+    android::hardware::identity::support::hexdump(message, dataVec);
+}
+
+void eicCborPrettyPrint(const uint8_t* cborData, size_t cborDataSize, size_t maxBStrSize) {
+    vector<uint8_t> cborDataVec(cborDataSize);
+    memcpy(cborDataVec.data(), cborData, cborDataSize);
+    string str =
+            android::hardware::identity::support::cborPrettyPrint(cborDataVec, maxBStrSize, {});
+    fprintf(stderr, "%s\n", str.c_str());
+}
+
+#endif  // EIC_DEBUG
diff --git a/identity/aidl/default/EicOpsImpl.h b/identity/aidl/default/EicOpsImpl.h
new file mode 100644
index 0000000..333cdce
--- /dev/null
+++ b/identity/aidl/default/EicOpsImpl.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_OPS_IMPL_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_OPS_IMPL_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+// Add whatever includes are needed for definitions below.
+//
+
+#include <openssl/hmac.h>
+#include <openssl/sha.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Set the following defines to match the implementation of the supplied
+// eicOps*() operations. See EicOps.h for details.
+//
+
+#define EIC_SHA256_CONTEXT_SIZE sizeof(SHA256_CTX)
+
+#define EIC_HMAC_SHA256_CONTEXT_SIZE sizeof(HMAC_CTX)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_EMBEDDED_IC_H
diff --git a/identity/aidl/default/FakeSecureHardwareProxy.cpp b/identity/aidl/default/FakeSecureHardwareProxy.cpp
new file mode 100644
index 0000000..de6762f
--- /dev/null
+++ b/identity/aidl/default/FakeSecureHardwareProxy.cpp
@@ -0,0 +1,324 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "FakeSecureHardwareProxy"
+
+#include "FakeSecureHardwareProxy.h"
+
+#include <android/hardware/identity/support/IdentityCredentialSupport.h>
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <string.h>
+
+#include <openssl/sha.h>
+
+#include <openssl/aes.h>
+#include <openssl/bn.h>
+#include <openssl/crypto.h>
+#include <openssl/ec.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/hkdf.h>
+#include <openssl/hmac.h>
+#include <openssl/objects.h>
+#include <openssl/pem.h>
+#include <openssl/pkcs12.h>
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+#include <openssl/x509_vfy.h>
+
+#include <libeic.h>
+
+using ::std::optional;
+using ::std::string;
+using ::std::tuple;
+using ::std::vector;
+
+namespace android::hardware::identity {
+
+// ----------------------------------------------------------------------
+
+FakeSecureHardwareProvisioningProxy::FakeSecureHardwareProvisioningProxy() {}
+
+FakeSecureHardwareProvisioningProxy::~FakeSecureHardwareProvisioningProxy() {}
+
+bool FakeSecureHardwareProvisioningProxy::shutdown() {
+    LOG(INFO) << "FakeSecureHardwarePresentationProxy shutdown";
+    return true;
+}
+
+bool FakeSecureHardwareProvisioningProxy::initialize(bool testCredential) {
+    LOG(INFO) << "FakeSecureHardwareProvisioningProxy created, sizeof(EicProvisioning): "
+              << sizeof(EicProvisioning);
+    return eicProvisioningInit(&ctx_, testCredential);
+}
+
+// Returns public key certificate.
+optional<vector<uint8_t>> FakeSecureHardwareProvisioningProxy::createCredentialKey(
+        const vector<uint8_t>& challenge, const vector<uint8_t>& applicationId) {
+    uint8_t publicKeyCert[4096];
+    size_t publicKeyCertSize = sizeof publicKeyCert;
+    if (!eicProvisioningCreateCredentialKey(&ctx_, challenge.data(), challenge.size(),
+                                            applicationId.data(), applicationId.size(),
+                                            publicKeyCert, &publicKeyCertSize)) {
+        return {};
+    }
+    vector<uint8_t> pubKeyCert(publicKeyCertSize);
+    memcpy(pubKeyCert.data(), publicKeyCert, publicKeyCertSize);
+    return pubKeyCert;
+}
+
+bool FakeSecureHardwareProvisioningProxy::startPersonalization(
+        int accessControlProfileCount, vector<int> entryCounts, const string& docType,
+        size_t expectedProofOfProvisioningSize) {
+    if (!eicProvisioningStartPersonalization(&ctx_, accessControlProfileCount, entryCounts.data(),
+                                             entryCounts.size(), docType.c_str(),
+                                             expectedProofOfProvisioningSize)) {
+        return false;
+    }
+    return true;
+}
+
+// Returns MAC (28 bytes).
+optional<vector<uint8_t>> FakeSecureHardwareProvisioningProxy::addAccessControlProfile(
+        int id, const vector<uint8_t>& readerCertificate, bool userAuthenticationRequired,
+        uint64_t timeoutMillis, uint64_t secureUserId) {
+    vector<uint8_t> mac(28);
+    if (!eicProvisioningAddAccessControlProfile(
+                &ctx_, id, readerCertificate.data(), readerCertificate.size(),
+                userAuthenticationRequired, timeoutMillis, secureUserId, mac.data())) {
+        return {};
+    }
+    return mac;
+}
+
+bool FakeSecureHardwareProvisioningProxy::beginAddEntry(const vector<int>& accessControlProfileIds,
+                                                        const string& nameSpace, const string& name,
+                                                        uint64_t entrySize) {
+    uint8_t scratchSpace[512];
+    return eicProvisioningBeginAddEntry(&ctx_, accessControlProfileIds.data(),
+                                        accessControlProfileIds.size(), nameSpace.c_str(),
+                                        name.c_str(), entrySize, scratchSpace, sizeof scratchSpace);
+}
+
+// Returns encryptedContent.
+optional<vector<uint8_t>> FakeSecureHardwareProvisioningProxy::addEntryValue(
+        const vector<int>& accessControlProfileIds, const string& nameSpace, const string& name,
+        const vector<uint8_t>& content) {
+    vector<uint8_t> eicEncryptedContent;
+    uint8_t scratchSpace[512];
+    eicEncryptedContent.resize(content.size() + 28);
+    if (!eicProvisioningAddEntryValue(
+                &ctx_, accessControlProfileIds.data(), accessControlProfileIds.size(),
+                nameSpace.c_str(), name.c_str(), content.data(), content.size(),
+                eicEncryptedContent.data(), scratchSpace, sizeof scratchSpace)) {
+        return {};
+    }
+    return eicEncryptedContent;
+}
+
+// Returns signatureOfToBeSigned (EIC_ECDSA_P256_SIGNATURE_SIZE bytes).
+optional<vector<uint8_t>> FakeSecureHardwareProvisioningProxy::finishAddingEntries() {
+    vector<uint8_t> signatureOfToBeSigned(EIC_ECDSA_P256_SIGNATURE_SIZE);
+    if (!eicProvisioningFinishAddingEntries(&ctx_, signatureOfToBeSigned.data())) {
+        return {};
+    }
+    return signatureOfToBeSigned;
+}
+
+// Returns encryptedCredentialKeys (80 bytes).
+optional<vector<uint8_t>> FakeSecureHardwareProvisioningProxy::finishGetCredentialData(
+        const string& docType) {
+    vector<uint8_t> encryptedCredentialKeys(80);
+    if (!eicProvisioningFinishGetCredentialData(&ctx_, docType.c_str(),
+                                                encryptedCredentialKeys.data())) {
+        return {};
+    }
+    return encryptedCredentialKeys;
+}
+
+// ----------------------------------------------------------------------
+
+FakeSecureHardwarePresentationProxy::FakeSecureHardwarePresentationProxy() {}
+
+FakeSecureHardwarePresentationProxy::~FakeSecureHardwarePresentationProxy() {}
+
+bool FakeSecureHardwarePresentationProxy::initialize(bool testCredential, string docType,
+                                                     vector<uint8_t> encryptedCredentialKeys) {
+    LOG(INFO) << "FakeSecureHardwarePresentationProxy created, sizeof(EicPresentation): "
+              << sizeof(EicPresentation);
+    return eicPresentationInit(&ctx_, testCredential, docType.c_str(),
+                               encryptedCredentialKeys.data());
+}
+
+// Returns publicKeyCert (1st component) and signingKeyBlob (2nd component)
+optional<pair<vector<uint8_t>, vector<uint8_t>>>
+FakeSecureHardwarePresentationProxy::generateSigningKeyPair(string docType, time_t now) {
+    uint8_t publicKeyCert[512];
+    size_t publicKeyCertSize = sizeof(publicKeyCert);
+    vector<uint8_t> signingKeyBlob(60);
+
+    if (!eicPresentationGenerateSigningKeyPair(&ctx_, docType.c_str(), now, publicKeyCert,
+                                               &publicKeyCertSize, signingKeyBlob.data())) {
+        return {};
+    }
+
+    vector<uint8_t> cert;
+    cert.resize(publicKeyCertSize);
+    memcpy(cert.data(), publicKeyCert, publicKeyCertSize);
+
+    return std::make_pair(cert, signingKeyBlob);
+}
+
+// Returns private key
+optional<vector<uint8_t>> FakeSecureHardwarePresentationProxy::createEphemeralKeyPair() {
+    vector<uint8_t> priv(EIC_P256_PRIV_KEY_SIZE);
+    if (!eicPresentationCreateEphemeralKeyPair(&ctx_, priv.data())) {
+        return {};
+    }
+    return priv;
+}
+
+optional<uint64_t> FakeSecureHardwarePresentationProxy::createAuthChallenge() {
+    uint64_t challenge;
+    if (!eicPresentationCreateAuthChallenge(&ctx_, &challenge)) {
+        return {};
+    }
+    return challenge;
+}
+
+bool FakeSecureHardwarePresentationProxy::shutdown() {
+    LOG(INFO) << "FakeSecureHardwarePresentationProxy shutdown";
+    return true;
+}
+
+bool FakeSecureHardwarePresentationProxy::pushReaderCert(const vector<uint8_t>& certX509) {
+    return eicPresentationPushReaderCert(&ctx_, certX509.data(), certX509.size());
+}
+
+bool FakeSecureHardwarePresentationProxy::validateRequestMessage(
+        const vector<uint8_t>& sessionTranscript, const vector<uint8_t>& requestMessage,
+        int coseSignAlg, const vector<uint8_t>& readerSignatureOfToBeSigned) {
+    return eicPresentationValidateRequestMessage(
+            &ctx_, sessionTranscript.data(), sessionTranscript.size(), requestMessage.data(),
+            requestMessage.size(), coseSignAlg, readerSignatureOfToBeSigned.data(),
+            readerSignatureOfToBeSigned.size());
+}
+
+bool FakeSecureHardwarePresentationProxy::setAuthToken(
+        uint64_t challenge, uint64_t secureUserId, uint64_t authenticatorId,
+        int hardwareAuthenticatorType, uint64_t timeStamp, const vector<uint8_t>& mac,
+        uint64_t verificationTokenChallenge, uint64_t verificationTokenTimestamp,
+        int verificationTokenSecurityLevel, const vector<uint8_t>& verificationTokenMac) {
+    return eicPresentationSetAuthToken(&ctx_, challenge, secureUserId, authenticatorId,
+                                       hardwareAuthenticatorType, timeStamp, mac.data(), mac.size(),
+                                       verificationTokenChallenge, verificationTokenTimestamp,
+                                       verificationTokenSecurityLevel, verificationTokenMac.data(),
+                                       verificationTokenMac.size());
+}
+
+optional<bool> FakeSecureHardwarePresentationProxy::validateAccessControlProfile(
+        int id, const vector<uint8_t>& readerCertificate, bool userAuthenticationRequired,
+        int timeoutMillis, uint64_t secureUserId, const vector<uint8_t>& mac) {
+    bool accessGranted = false;
+    if (!eicPresentationValidateAccessControlProfile(&ctx_, id, readerCertificate.data(),
+                                                     readerCertificate.size(),
+                                                     userAuthenticationRequired, timeoutMillis,
+                                                     secureUserId, mac.data(), &accessGranted)) {
+        return {};
+    }
+    return accessGranted;
+}
+
+bool FakeSecureHardwarePresentationProxy::startRetrieveEntries() {
+    return eicPresentationStartRetrieveEntries(&ctx_);
+}
+
+bool FakeSecureHardwarePresentationProxy::calcMacKey(
+        const vector<uint8_t>& sessionTranscript, const vector<uint8_t>& readerEphemeralPublicKey,
+        const vector<uint8_t>& signingKeyBlob, const string& docType,
+        unsigned int numNamespacesWithValues, size_t expectedProofOfProvisioningSize) {
+    if (signingKeyBlob.size() != 60) {
+        eicDebug("Unexpected size %zd of signingKeyBlob, expected 60", signingKeyBlob.size());
+        return false;
+    }
+    return eicPresentationCalcMacKey(&ctx_, sessionTranscript.data(), sessionTranscript.size(),
+                                     readerEphemeralPublicKey.data(), signingKeyBlob.data(),
+                                     docType.c_str(), numNamespacesWithValues,
+                                     expectedProofOfProvisioningSize);
+}
+
+AccessCheckResult FakeSecureHardwarePresentationProxy::startRetrieveEntryValue(
+        const string& nameSpace, const string& name, unsigned int newNamespaceNumEntries,
+        int32_t entrySize, const vector<int32_t>& accessControlProfileIds) {
+    uint8_t scratchSpace[512];
+    EicAccessCheckResult result = eicPresentationStartRetrieveEntryValue(
+            &ctx_, nameSpace.c_str(), name.c_str(), newNamespaceNumEntries, entrySize,
+            accessControlProfileIds.data(), accessControlProfileIds.size(), scratchSpace,
+            sizeof scratchSpace);
+    switch (result) {
+        case EIC_ACCESS_CHECK_RESULT_OK:
+            return AccessCheckResult::kOk;
+        case EIC_ACCESS_CHECK_RESULT_NO_ACCESS_CONTROL_PROFILES:
+            return AccessCheckResult::kNoAccessControlProfiles;
+        case EIC_ACCESS_CHECK_RESULT_FAILED:
+            return AccessCheckResult::kFailed;
+        case EIC_ACCESS_CHECK_RESULT_USER_AUTHENTICATION_FAILED:
+            return AccessCheckResult::kUserAuthenticationFailed;
+        case EIC_ACCESS_CHECK_RESULT_READER_AUTHENTICATION_FAILED:
+            return AccessCheckResult::kReaderAuthenticationFailed;
+    }
+    eicDebug("Unknown result with code %d, returning kFailed", (int)result);
+    return AccessCheckResult::kFailed;
+}
+
+optional<vector<uint8_t>> FakeSecureHardwarePresentationProxy::retrieveEntryValue(
+        const vector<uint8_t>& encryptedContent, const string& nameSpace, const string& name,
+        const vector<int32_t>& accessControlProfileIds) {
+    uint8_t scratchSpace[512];
+    vector<uint8_t> content;
+    content.resize(encryptedContent.size() - 28);
+    if (!eicPresentationRetrieveEntryValue(
+                &ctx_, encryptedContent.data(), encryptedContent.size(), content.data(),
+                nameSpace.c_str(), name.c_str(), accessControlProfileIds.data(),
+                accessControlProfileIds.size(), scratchSpace, sizeof scratchSpace)) {
+        return {};
+    }
+    return content;
+}
+
+optional<vector<uint8_t>> FakeSecureHardwarePresentationProxy::finishRetrieval() {
+    vector<uint8_t> mac(32);
+    size_t macSize = 32;
+    if (!eicPresentationFinishRetrieval(&ctx_, mac.data(), &macSize)) {
+        return {};
+    }
+    mac.resize(macSize);
+    return mac;
+}
+
+optional<vector<uint8_t>> FakeSecureHardwarePresentationProxy::deleteCredential(
+        const string& docType, size_t proofOfDeletionCborSize) {
+    vector<uint8_t> signatureOfToBeSigned(EIC_ECDSA_P256_SIGNATURE_SIZE);
+    if (!eicPresentationDeleteCredential(&ctx_, docType.c_str(), proofOfDeletionCborSize,
+                                         signatureOfToBeSigned.data())) {
+        return {};
+    }
+    return signatureOfToBeSigned;
+}
+
+}  // namespace android::hardware::identity
diff --git a/identity/aidl/default/FakeSecureHardwareProxy.h b/identity/aidl/default/FakeSecureHardwareProxy.h
new file mode 100644
index 0000000..b858dd4
--- /dev/null
+++ b/identity/aidl/default/FakeSecureHardwareProxy.h
@@ -0,0 +1,151 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_IDENTITY_FAKESECUREHARDWAREPROXY_H
+#define ANDROID_HARDWARE_IDENTITY_FAKESECUREHARDWAREPROXY_H
+
+#include <libeic/libeic.h>
+
+#include "SecureHardwareProxy.h"
+
+namespace android::hardware::identity {
+
+// This implementation uses libEmbeddedIC in-process.
+//
+class FakeSecureHardwareProvisioningProxy : public SecureHardwareProvisioningProxy {
+  public:
+    FakeSecureHardwareProvisioningProxy();
+    virtual ~FakeSecureHardwareProvisioningProxy();
+
+    bool initialize(bool testCredential) override;
+
+    bool shutdown() override;
+
+    // Returns public key certificate.
+    optional<vector<uint8_t>> createCredentialKey(const vector<uint8_t>& challenge,
+                                                  const vector<uint8_t>& applicationId) override;
+
+    bool startPersonalization(int accessControlProfileCount, vector<int> entryCounts,
+                              const string& docType,
+                              size_t expectedProofOfProvisioningSize) override;
+
+    // Returns MAC (28 bytes).
+    optional<vector<uint8_t>> addAccessControlProfile(int id,
+                                                      const vector<uint8_t>& readerCertificate,
+                                                      bool userAuthenticationRequired,
+                                                      uint64_t timeoutMillis,
+                                                      uint64_t secureUserId) override;
+
+    bool beginAddEntry(const vector<int>& accessControlProfileIds, const string& nameSpace,
+                       const string& name, uint64_t entrySize) override;
+
+    // Returns encryptedContent.
+    optional<vector<uint8_t>> addEntryValue(const vector<int>& accessControlProfileIds,
+                                            const string& nameSpace, const string& name,
+                                            const vector<uint8_t>& content) override;
+
+    // Returns signatureOfToBeSigned (EIC_ECDSA_P256_SIGNATURE_SIZE bytes).
+    optional<vector<uint8_t>> finishAddingEntries() override;
+
+    // Returns encryptedCredentialKeys (80 bytes).
+    optional<vector<uint8_t>> finishGetCredentialData(const string& docType) override;
+
+  protected:
+    EicProvisioning ctx_;
+};
+
+// This implementation uses libEmbeddedIC in-process.
+//
+class FakeSecureHardwarePresentationProxy : public SecureHardwarePresentationProxy {
+  public:
+    FakeSecureHardwarePresentationProxy();
+    virtual ~FakeSecureHardwarePresentationProxy();
+
+    bool initialize(bool testCredential, string docType,
+                    vector<uint8_t> encryptedCredentialKeys) override;
+
+    // Returns publicKeyCert (1st component) and signingKeyBlob (2nd component)
+    optional<pair<vector<uint8_t>, vector<uint8_t>>> generateSigningKeyPair(string docType,
+                                                                            time_t now) override;
+
+    // Returns private key
+    optional<vector<uint8_t>> createEphemeralKeyPair() override;
+
+    optional<uint64_t> createAuthChallenge() override;
+
+    bool startRetrieveEntries() override;
+
+    bool setAuthToken(uint64_t challenge, uint64_t secureUserId, uint64_t authenticatorId,
+                      int hardwareAuthenticatorType, uint64_t timeStamp, const vector<uint8_t>& mac,
+                      uint64_t verificationTokenChallenge, uint64_t verificationTokenTimestamp,
+                      int verificationTokenSecurityLevel,
+                      const vector<uint8_t>& verificationTokenMac) override;
+
+    bool pushReaderCert(const vector<uint8_t>& certX509) override;
+
+    optional<bool> validateAccessControlProfile(int id, const vector<uint8_t>& readerCertificate,
+                                                bool userAuthenticationRequired, int timeoutMillis,
+                                                uint64_t secureUserId,
+                                                const vector<uint8_t>& mac) override;
+
+    bool validateRequestMessage(const vector<uint8_t>& sessionTranscript,
+                                const vector<uint8_t>& requestMessage, int coseSignAlg,
+                                const vector<uint8_t>& readerSignatureOfToBeSigned) override;
+
+    bool calcMacKey(const vector<uint8_t>& sessionTranscript,
+                    const vector<uint8_t>& readerEphemeralPublicKey,
+                    const vector<uint8_t>& signingKeyBlob, const string& docType,
+                    unsigned int numNamespacesWithValues,
+                    size_t expectedProofOfProvisioningSize) override;
+
+    AccessCheckResult startRetrieveEntryValue(
+            const string& nameSpace, const string& name, unsigned int newNamespaceNumEntries,
+            int32_t entrySize, const vector<int32_t>& accessControlProfileIds) override;
+
+    optional<vector<uint8_t>> retrieveEntryValue(
+            const vector<uint8_t>& encryptedContent, const string& nameSpace, const string& name,
+            const vector<int32_t>& accessControlProfileIds) override;
+
+    optional<vector<uint8_t>> finishRetrieval() override;
+
+    optional<vector<uint8_t>> deleteCredential(const string& docType,
+                                               size_t proofOfDeletionCborSize) override;
+
+    bool shutdown() override;
+
+  protected:
+    EicPresentation ctx_;
+};
+
+// Factory implementation.
+//
+class FakeSecureHardwareProxyFactory : public SecureHardwareProxyFactory {
+  public:
+    FakeSecureHardwareProxyFactory() {}
+    virtual ~FakeSecureHardwareProxyFactory() {}
+
+    sp<SecureHardwareProvisioningProxy> createProvisioningProxy() override {
+        return new FakeSecureHardwareProvisioningProxy();
+    }
+
+    sp<SecureHardwarePresentationProxy> createPresentationProxy() override {
+        return new FakeSecureHardwarePresentationProxy();
+    }
+};
+
+}  // namespace android::hardware::identity
+
+#endif  // ANDROID_HARDWARE_IDENTITY_FAKESECUREHARDWAREPROXY_H
diff --git a/identity/aidl/default/Util.cpp b/identity/aidl/default/Util.cpp
deleted file mode 100644
index 66b9f13..0000000
--- a/identity/aidl/default/Util.cpp
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * Copyright 2019, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define LOG_TAG "Util"
-
-#include "Util.h"
-
-#include <android/hardware/identity/support/IdentityCredentialSupport.h>
-
-#include <string.h>
-
-#include <android-base/logging.h>
-
-#include <cppbor.h>
-#include <cppbor_parse.h>
-
-namespace aidl::android::hardware::identity {
-
-using namespace ::android::hardware::identity;
-
-// This is not a very random HBK but that's OK because this is the SW
-// implementation where it can't be kept secret.
-vector<uint8_t> hardwareBoundKey = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
-
-const vector<uint8_t>& getHardwareBoundKey() {
-    return hardwareBoundKey;
-}
-
-vector<uint8_t> secureAccessControlProfileEncodeCbor(const SecureAccessControlProfile& profile) {
-    cppbor::Map map;
-    map.add("id", profile.id);
-
-    if (profile.readerCertificate.encodedCertificate.size() > 0) {
-        map.add("readerCertificate", cppbor::Bstr(profile.readerCertificate.encodedCertificate));
-    }
-
-    if (profile.userAuthenticationRequired) {
-        map.add("userAuthenticationRequired", profile.userAuthenticationRequired);
-        map.add("timeoutMillis", profile.timeoutMillis);
-        map.add("secureUserId", profile.secureUserId);
-    }
-
-    return map.encode();
-}
-
-optional<vector<uint8_t>> secureAccessControlProfileCalcMac(
-        const SecureAccessControlProfile& profile, const vector<uint8_t>& storageKey) {
-    vector<uint8_t> cborData = secureAccessControlProfileEncodeCbor(profile);
-
-    optional<vector<uint8_t>> nonce = support::getRandom(12);
-    if (!nonce) {
-        return {};
-    }
-    optional<vector<uint8_t>> macO =
-            support::encryptAes128Gcm(storageKey, nonce.value(), {}, cborData);
-    if (!macO) {
-        return {};
-    }
-    return macO.value();
-}
-
-bool secureAccessControlProfileCheckMac(const SecureAccessControlProfile& profile,
-                                        const vector<uint8_t>& storageKey) {
-    vector<uint8_t> cborData = secureAccessControlProfileEncodeCbor(profile);
-
-    if (profile.mac.size() < support::kAesGcmIvSize) {
-        return false;
-    }
-    vector<uint8_t> nonce =
-            vector<uint8_t>(profile.mac.begin(), profile.mac.begin() + support::kAesGcmIvSize);
-    optional<vector<uint8_t>> mac = support::encryptAes128Gcm(storageKey, nonce, {}, cborData);
-    if (!mac) {
-        return false;
-    }
-    if (mac.value() != profile.mac) {
-        return false;
-    }
-    return true;
-}
-
-vector<uint8_t> entryCreateAdditionalData(const string& nameSpace, const string& name,
-                                          const vector<int32_t> accessControlProfileIds) {
-    cppbor::Map map;
-    map.add("Namespace", nameSpace);
-    map.add("Name", name);
-
-    cppbor::Array acpIds;
-    for (auto id : accessControlProfileIds) {
-        acpIds.add(id);
-    }
-    map.add("AccessControlProfileIds", std::move(acpIds));
-    return map.encode();
-}
-
-}  // namespace aidl::android::hardware::identity
diff --git a/identity/aidl/default/Util.h b/identity/aidl/default/Util.h
deleted file mode 100644
index 9fccba2..0000000
--- a/identity/aidl/default/Util.h
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Copyright 2019, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_HARDWARE_IDENTITY_UTIL_H
-#define ANDROID_HARDWARE_IDENTITY_UTIL_H
-
-#include <aidl/android/hardware/identity/BnIdentityCredential.h>
-#include <android/hardware/identity/support/IdentityCredentialSupport.h>
-
-#include <map>
-#include <optional>
-#include <set>
-#include <string>
-#include <vector>
-
-#include <cppbor/cppbor.h>
-
-namespace aidl::android::hardware::identity {
-
-using ::std::optional;
-using ::std::string;
-using ::std::vector;
-
-// Returns the hardware-bound AES-128 key.
-const vector<uint8_t>& getHardwareBoundKey();
-
-// Calculates the MAC for |profile| using |storageKey|.
-optional<vector<uint8_t>> secureAccessControlProfileCalcMac(
-        const SecureAccessControlProfile& profile, const vector<uint8_t>& storageKey);
-
-// Checks authenticity of the MAC in |profile| using |storageKey|.
-bool secureAccessControlProfileCheckMac(const SecureAccessControlProfile& profile,
-                                        const vector<uint8_t>& storageKey);
-
-// Creates the AdditionalData CBOR used in the addEntryValue() HIDL method.
-vector<uint8_t> entryCreateAdditionalData(const string& nameSpace, const string& name,
-                                          const vector<int32_t> accessControlProfileIds);
-
-}  // namespace aidl::android::hardware::identity
-
-#endif  // ANDROID_HARDWARE_IDENTITY_UTIL_H
diff --git a/identity/aidl/default/IdentityCredential.cpp b/identity/aidl/default/common/IdentityCredential.cpp
similarity index 65%
rename from identity/aidl/default/IdentityCredential.cpp
rename to identity/aidl/default/common/IdentityCredential.cpp
index dfcd4f5..270fcfa 100644
--- a/identity/aidl/default/IdentityCredential.cpp
+++ b/identity/aidl/default/common/IdentityCredential.cpp
@@ -18,7 +18,6 @@
 
 #include "IdentityCredential.h"
 #include "IdentityCredentialStore.h"
-#include "Util.h"
 
 #include <android/hardware/identity/support/IdentityCredentialSupport.h>
 
@@ -30,6 +29,8 @@
 #include <cppbor.h>
 #include <cppbor_parse.h>
 
+#include "FakeSecureHardwareProxy.h"
+
 namespace aidl::android::hardware::identity {
 
 using ::aidl::android::hardware::keymaster::Timestamp;
@@ -69,40 +70,17 @@
     docType_ = docTypeItem->value();
     testCredential_ = testCredentialItem->value();
 
-    vector<uint8_t> hardwareBoundKey;
-    if (testCredential_) {
-        hardwareBoundKey = support::getTestHardwareBoundKey();
-    } else {
-        hardwareBoundKey = getHardwareBoundKey();
-    }
-
     const vector<uint8_t>& encryptedCredentialKeys = encryptedCredentialKeysItem->value();
-    const vector<uint8_t> docTypeVec(docType_.begin(), docType_.end());
-    optional<vector<uint8_t>> decryptedCredentialKeys =
-            support::decryptAes128Gcm(hardwareBoundKey, encryptedCredentialKeys, docTypeVec);
-    if (!decryptedCredentialKeys) {
-        LOG(ERROR) << "Error decrypting CredentialKeys";
+
+    if (encryptedCredentialKeys.size() != 80) {
+        LOG(ERROR) << "Unexpected size for encrypted CredentialKeys";
         return IIdentityCredentialStore::STATUS_INVALID_DATA;
     }
 
-    auto [dckItem, dckPos, dckMessage] = cppbor::parse(decryptedCredentialKeys.value());
-    if (dckItem == nullptr) {
-        LOG(ERROR) << "Decrypted CredentialKeys is not valid CBOR: " << dckMessage;
-        return IIdentityCredentialStore::STATUS_INVALID_DATA;
+    if (!hwProxy_->initialize(testCredential_, docType_, encryptedCredentialKeys)) {
+        LOG(ERROR) << "hwProxy->initialize failed";
+        return false;
     }
-    const cppbor::Array* dckArrayItem = dckItem->asArray();
-    if (dckArrayItem == nullptr || dckArrayItem->size() != 2) {
-        LOG(ERROR) << "Decrypted CredentialKeys is not an array with two elements";
-        return IIdentityCredentialStore::STATUS_INVALID_DATA;
-    }
-    const cppbor::Bstr* storageKeyItem = (*dckArrayItem)[0]->asBstr();
-    const cppbor::Bstr* credentialPrivKeyItem = (*dckArrayItem)[1]->asBstr();
-    if (storageKeyItem == nullptr || credentialPrivKeyItem == nullptr) {
-        LOG(ERROR) << "CredentialKeys unexpected item types";
-        return IIdentityCredentialStore::STATUS_INVALID_DATA;
-    }
-    storageKey_ = storageKeyItem->value();
-    credentialPrivKey_ = credentialPrivKeyItem->value();
 
     return IIdentityCredentialStore::STATUS_OK;
 }
@@ -110,12 +88,20 @@
 ndk::ScopedAStatus IdentityCredential::deleteCredential(
         vector<uint8_t>* outProofOfDeletionSignature) {
     cppbor::Array array = {"ProofOfDeletion", docType_, testCredential_};
-    vector<uint8_t> proofOfDeletion = array.encode();
+    vector<uint8_t> proofOfDeletionCbor = array.encode();
+    vector<uint8_t> podDigest = support::sha256(proofOfDeletionCbor);
 
-    optional<vector<uint8_t>> signature = support::coseSignEcDsa(credentialPrivKey_,
-                                                                 proofOfDeletion,  // payload
-                                                                 {},               // additionalData
-                                                                 {});  // certificateChain
+    optional<vector<uint8_t>> signatureOfToBeSigned =
+            hwProxy_->deleteCredential(docType_, proofOfDeletionCbor.size());
+    if (!signatureOfToBeSigned) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "Error signing ProofOfDeletion"));
+    }
+
+    optional<vector<uint8_t>> signature =
+            support::coseSignEcDsaWithSignature(signatureOfToBeSigned.value(),
+                                                proofOfDeletionCbor,  // data
+                                                {});                  // certificateChain
     if (!signature) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED, "Error signing data"));
@@ -126,22 +112,28 @@
 }
 
 ndk::ScopedAStatus IdentityCredential::createEphemeralKeyPair(vector<uint8_t>* outKeyPair) {
-    optional<vector<uint8_t>> kp = support::createEcKeyPair();
-    if (!kp) {
+    optional<vector<uint8_t>> ephemeralPriv = hwProxy_->createEphemeralKeyPair();
+    if (!ephemeralPriv) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error creating ephemeral key pair"));
+                IIdentityCredentialStore::STATUS_FAILED, "Error creating ephemeral key"));
+    }
+    optional<vector<uint8_t>> keyPair = support::ecPrivateKeyToKeyPair(ephemeralPriv.value());
+    if (!keyPair) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "Error creating ephemeral key-pair"));
     }
 
     // Stash public key of this key-pair for later check in startRetrieval().
-    optional<vector<uint8_t>> publicKey = support::ecKeyPairGetPublicKey(kp.value());
+    optional<vector<uint8_t>> publicKey = support::ecKeyPairGetPublicKey(keyPair.value());
     if (!publicKey) {
+        LOG(ERROR) << "Error getting public part of ephemeral key pair";
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED,
                 "Error getting public part of ephemeral key pair"));
     }
     ephemeralPublicKey_ = publicKey.value();
 
-    *outKeyPair = kp.value();
+    *outKeyPair = keyPair.value();
     return ndk::ScopedAStatus::ok();
 }
 
@@ -152,109 +144,15 @@
 }
 
 ndk::ScopedAStatus IdentityCredential::createAuthChallenge(int64_t* outChallenge) {
-    uint64_t challenge = 0;
-    while (challenge == 0) {
-        optional<vector<uint8_t>> bytes = support::getRandom(8);
-        if (!bytes) {
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_FAILED,
-                    "Error getting random data for challenge"));
-        }
-
-        challenge = 0;
-        for (size_t n = 0; n < bytes.value().size(); n++) {
-            challenge |= ((bytes.value())[n] << (n * 8));
-        }
+    optional<uint64_t> challenge = hwProxy_->createAuthChallenge();
+    if (!challenge) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "Error generating challenge"));
     }
-
-    *outChallenge = challenge;
-    authChallenge_ = challenge;
+    *outChallenge = challenge.value();
     return ndk::ScopedAStatus::ok();
 }
 
-// TODO: this could be a lot faster if we did all the splitting and pubkey extraction
-// ahead of time.
-bool checkReaderAuthentication(const SecureAccessControlProfile& profile,
-                               const vector<uint8_t>& readerCertificateChain) {
-    optional<vector<uint8_t>> acpPubKey =
-            support::certificateChainGetTopMostKey(profile.readerCertificate.encodedCertificate);
-    if (!acpPubKey) {
-        LOG(ERROR) << "Error extracting public key from readerCertificate in profile";
-        return false;
-    }
-
-    optional<vector<vector<uint8_t>>> certificatesInChain =
-            support::certificateChainSplit(readerCertificateChain);
-    if (!certificatesInChain) {
-        LOG(ERROR) << "Error splitting readerCertificateChain";
-        return false;
-    }
-    for (const vector<uint8_t>& certInChain : certificatesInChain.value()) {
-        optional<vector<uint8_t>> certPubKey = support::certificateChainGetTopMostKey(certInChain);
-        if (!certPubKey) {
-            LOG(ERROR)
-                    << "Error extracting public key from certificate in chain presented by reader";
-            return false;
-        }
-        if (acpPubKey.value() == certPubKey.value()) {
-            return true;
-        }
-    }
-    return false;
-}
-
-bool checkUserAuthentication(const SecureAccessControlProfile& profile,
-                             const VerificationToken& verificationToken,
-                             const HardwareAuthToken& authToken, uint64_t authChallenge) {
-    if (profile.secureUserId != authToken.userId) {
-        LOG(ERROR) << "secureUserId in profile (" << profile.secureUserId
-                   << ") differs from userId in authToken (" << authToken.userId << ")";
-        return false;
-    }
-
-    if (verificationToken.timestamp.milliSeconds == 0) {
-        LOG(ERROR) << "VerificationToken is not set";
-        return false;
-    }
-    if (authToken.timestamp.milliSeconds == 0) {
-        LOG(ERROR) << "AuthToken is not set";
-        return false;
-    }
-
-    if (profile.timeoutMillis == 0) {
-        if (authToken.challenge == 0) {
-            LOG(ERROR) << "No challenge in authToken";
-            return false;
-        }
-
-        if (authToken.challenge != int64_t(authChallenge)) {
-            LOG(ERROR) << "Challenge in authToken (" << uint64_t(authToken.challenge) << ") "
-                       << "doesn't match the challenge we created (" << authChallenge << ")";
-            return false;
-        }
-        return true;
-    }
-
-    // Timeout-based user auth follows. The verification token conveys what the
-    // time is right now in the environment which generated the auth token. This
-    // is what makes it possible to do timeout-based checks.
-    //
-    const Timestamp now = verificationToken.timestamp;
-    if (authToken.timestamp.milliSeconds > now.milliSeconds) {
-        LOG(ERROR) << "Timestamp in authToken (" << authToken.timestamp.milliSeconds
-                   << ") is in the future (now: " << now.milliSeconds << ")";
-        return false;
-    }
-    if (now.milliSeconds > authToken.timestamp.milliSeconds + profile.timeoutMillis) {
-        LOG(ERROR) << "Deadline for authToken (" << authToken.timestamp.milliSeconds << " + "
-                   << profile.timeoutMillis << " = "
-                   << (authToken.timestamp.milliSeconds + profile.timeoutMillis)
-                   << ") is in the past (now: " << now.milliSeconds << ")";
-        return false;
-    }
-    return true;
-}
-
 ndk::ScopedAStatus IdentityCredential::setRequestedNamespaces(
         const vector<RequestNamespace>& requestNamespaces) {
     requestNamespaces_ = requestNamespaces;
@@ -284,6 +182,7 @@
     }
     if (numStartRetrievalCalls_ > 0) {
         if (sessionTranscript_ != sessionTranscript) {
+            LOG(ERROR) << "Session Transcript changed";
             return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                     IIdentityCredentialStore::STATUS_SESSION_TRANSCRIPT_MISMATCH,
                     "Passed-in SessionTranscript doesn't match previously used SessionTranscript"));
@@ -291,6 +190,40 @@
     }
     sessionTranscript_ = sessionTranscript;
 
+    // This resets various state in the TA...
+    if (!hwProxy_->startRetrieveEntries()) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "Error starting retrieving entries"));
+    }
+
+    optional<vector<uint8_t>> signatureOfToBeSigned;
+    if (readerSignature.size() > 0) {
+        signatureOfToBeSigned = support::coseSignGetSignature(readerSignature);
+        if (!signatureOfToBeSigned) {
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
+                    "Error extracting signatureOfToBeSigned from COSE_Sign1"));
+        }
+    }
+
+    // Feed the auth token to secure hardware.
+    if (!hwProxy_->setAuthToken(authToken.challenge, authToken.userId, authToken.authenticatorId,
+                                int(authToken.authenticatorType), authToken.timestamp.milliSeconds,
+                                authToken.mac, verificationToken_.challenge,
+                                verificationToken_.timestamp.milliSeconds,
+                                int(verificationToken_.securityLevel), verificationToken_.mac)) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_INVALID_DATA, "Invalid Auth Token"));
+    }
+
+    // We'll be feeding ACPs interleaved with certificates from the reader
+    // certificate chain...
+    vector<SecureAccessControlProfile> remainingAcps = accessControlProfiles;
+
+    // ... and we'll use those ACPs to build up a 32-bit mask indicating which
+    // of the possible 32 ACPs grants access.
+    uint32_t accessControlProfileMask = 0;
+
     // If there is a signature, validate that it was made with the top-most key in the
     // certificate chain embedded in the COSE_Sign1 structure.
     optional<vector<uint8_t>> readerCertificateChain;
@@ -302,45 +235,113 @@
                     "Unable to get reader certificate chain from COSE_Sign1"));
         }
 
-        if (!support::certificateChainValidate(readerCertificateChain.value())) {
+        // First, feed all the reader certificates to the secure hardware. We start
+        // at the end..
+        optional<vector<vector<uint8_t>>> splitCerts =
+                support::certificateChainSplit(readerCertificateChain.value());
+        if (!splitCerts || splitCerts.value().size() == 0) {
             return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                     IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
-                    "Error validating reader certificate chain"));
+                    "Error splitting certificate chain from COSE_Sign1"));
+        }
+        for (ssize_t n = splitCerts.value().size() - 1; n >= 0; --n) {
+            const vector<uint8_t>& x509Cert = splitCerts.value()[n];
+            if (!hwProxy_->pushReaderCert(x509Cert)) {
+                return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                        IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
+                        StringPrintf("Error validating reader certificate %zd", n).c_str()));
+            }
+
+            // If we have ACPs for that particular certificate, send them to the
+            // TA right now...
+            //
+            // Remember in this case certificate equality is done by comparing public keys,
+            // not bitwise comparison of the certificates.
+            //
+            optional<vector<uint8_t>> x509CertPubKey =
+                    support::certificateChainGetTopMostKey(x509Cert);
+            if (!x509CertPubKey) {
+                return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                        IIdentityCredentialStore::STATUS_FAILED,
+                        StringPrintf("Error getting public key from reader certificate %zd", n)
+                                .c_str()));
+            }
+            vector<SecureAccessControlProfile>::iterator it = remainingAcps.begin();
+            while (it != remainingAcps.end()) {
+                const SecureAccessControlProfile& profile = *it;
+                if (profile.readerCertificate.encodedCertificate.size() == 0) {
+                    ++it;
+                    continue;
+                }
+                optional<vector<uint8_t>> profilePubKey = support::certificateChainGetTopMostKey(
+                        profile.readerCertificate.encodedCertificate);
+                if (!profilePubKey) {
+                    return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                            IIdentityCredentialStore::STATUS_FAILED,
+                            "Error getting public key from profile"));
+                }
+                if (profilePubKey.value() == x509CertPubKey.value()) {
+                    optional<bool> res = hwProxy_->validateAccessControlProfile(
+                            profile.id, profile.readerCertificate.encodedCertificate,
+                            profile.userAuthenticationRequired, profile.timeoutMillis,
+                            profile.secureUserId, profile.mac);
+                    if (!res) {
+                        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                                IIdentityCredentialStore::STATUS_INVALID_DATA,
+                                "Error validating access control profile"));
+                    }
+                    if (res.value()) {
+                        accessControlProfileMask |= (1 << profile.id);
+                    }
+                    it = remainingAcps.erase(it);
+                } else {
+                    ++it;
+                }
+            }
         }
 
-        optional<vector<uint8_t>> readerPublicKey =
-                support::certificateChainGetTopMostKey(readerCertificateChain.value());
-        if (!readerPublicKey) {
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
-                    "Unable to get public key from reader certificate chain"));
-        }
-
-        const vector<uint8_t>& itemsRequestBytes = itemsRequest;
-        vector<uint8_t> encodedReaderAuthentication =
-                cppbor::Array()
-                        .add("ReaderAuthentication")
-                        .add(std::move(sessionTranscriptItem))
-                        .add(cppbor::Semantic(24, itemsRequestBytes))
-                        .encode();
-        vector<uint8_t> encodedReaderAuthenticationBytes =
-                cppbor::Semantic(24, encodedReaderAuthentication).encode();
-        if (!support::coseCheckEcDsaSignature(readerSignature,
-                                              encodedReaderAuthenticationBytes,  // detached content
-                                              readerPublicKey.value())) {
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
-                    "readerSignature check failed"));
+        // ... then pass the request message and have the TA check it's signed by the
+        // key in last certificate we pushed.
+        if (sessionTranscript.size() > 0 && itemsRequest.size() > 0 && readerSignature.size() > 0) {
+            optional<vector<uint8_t>> tbsSignature = support::coseSignGetSignature(readerSignature);
+            if (!tbsSignature) {
+                return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                        IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
+                        "Error extracting toBeSigned from COSE_Sign1"));
+            }
+            optional<int> coseSignAlg = support::coseSignGetAlg(readerSignature);
+            if (!coseSignAlg) {
+                return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                        IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
+                        "Error extracting signature algorithm from COSE_Sign1"));
+            }
+            if (!hwProxy_->validateRequestMessage(sessionTranscript, itemsRequest,
+                                                  coseSignAlg.value(), tbsSignature.value())) {
+                return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                        IIdentityCredentialStore::STATUS_READER_SIGNATURE_CHECK_FAILED,
+                        "readerMessage is not signed by top-level certificate"));
+            }
         }
     }
 
-    // Here's where we would validate the passed-in |authToken| to assure ourselves
-    // that it comes from the e.g. biometric hardware and wasn't made up by an attacker.
-    //
-    // However this involves calculating the MAC. However this requires access
-    // to the key needed to a pre-shared key which we don't have...
-    //
+    // Feed remaining access control profiles...
+    for (const SecureAccessControlProfile& profile : remainingAcps) {
+        optional<bool> res = hwProxy_->validateAccessControlProfile(
+                profile.id, profile.readerCertificate.encodedCertificate,
+                profile.userAuthenticationRequired, profile.timeoutMillis, profile.secureUserId,
+                profile.mac);
+        if (!res) {
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_INVALID_DATA,
+                    "Error validating access control profile"));
+        }
+        if (res.value()) {
+            accessControlProfileMask |= (1 << profile.id);
+        }
+    }
 
+    // TODO: move this check to the TA
+#if 1
     // To prevent replay-attacks, we check that the public part of the ephemeral
     // key we previously created, is present in the DeviceEngagement part of
     // SessionTranscript as a COSE_Key, in uncompressed form.
@@ -364,6 +365,7 @@
                     "SessionTranscript (make sure leading zeroes are not used)"));
         }
     }
+#endif
 
     // itemsRequest: If non-empty, contains request data that may be signed by the
     // reader.  The content can be defined in the way appropriate for the
@@ -463,30 +465,6 @@
         }
     }
 
-    // Validate all the access control profiles in the requestData.
-    bool haveAuthToken = (authToken.timestamp.milliSeconds != int64_t(0));
-    for (const auto& profile : accessControlProfiles) {
-        if (!secureAccessControlProfileCheckMac(profile, storageKey_)) {
-            LOG(ERROR) << "Error checking MAC for profile";
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_INVALID_DATA,
-                    "Error checking MAC for profile"));
-        }
-        int accessControlCheck = IIdentityCredentialStore::STATUS_OK;
-        if (profile.userAuthenticationRequired) {
-            if (!haveAuthToken ||
-                !checkUserAuthentication(profile, verificationToken_, authToken, authChallenge_)) {
-                accessControlCheck = IIdentityCredentialStore::STATUS_USER_AUTHENTICATION_FAILED;
-            }
-        } else if (profile.readerCertificate.encodedCertificate.size() > 0) {
-            if (!readerCertificateChain ||
-                !checkReaderAuthentication(profile, readerCertificateChain.value())) {
-                accessControlCheck = IIdentityCredentialStore::STATUS_READER_AUTHENTICATION_FAILED;
-            }
-        }
-        profileIdToAccessCheckResult_[profile.id] = accessControlCheck;
-    }
-
     deviceNameSpacesMap_ = cppbor::Map();
     currentNameSpaceDeviceNameSpacesMap_ = cppbor::Map();
 
@@ -496,8 +474,36 @@
     itemsRequest_ = itemsRequest;
     signingKeyBlob_ = signingKeyBlob;
 
-    // Finally, calculate the size of DeviceNameSpaces. We need to know it ahead of time.
-    expectedDeviceNameSpacesSize_ = calcDeviceNameSpacesSize();
+    // calculate the size of DeviceNameSpaces. We need to know it ahead of time.
+    calcDeviceNameSpacesSize(accessControlProfileMask);
+
+    // Count the number of non-empty namespaces
+    size_t numNamespacesWithValues = 0;
+    for (size_t n = 0; n < expectedNumEntriesPerNamespace_.size(); n++) {
+        if (expectedNumEntriesPerNamespace_[n] > 0) {
+            numNamespacesWithValues += 1;
+        }
+    }
+
+    // Finally, pass info so the HMAC key can be derived and the TA can start
+    // creating the DeviceNameSpaces CBOR...
+    if (sessionTranscript_.size() > 0 && readerPublicKey_.size() > 0 && signingKeyBlob.size() > 0) {
+        // We expect the reader ephemeral public key to be same size and curve
+        // as the ephemeral key we generated (e.g. P-256 key), otherwise ECDH
+        // won't work. So its length should be 65 bytes and it should be
+        // starting with 0x04.
+        if (readerPublicKey_.size() != 65 || readerPublicKey_[0] != 0x04) {
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_FAILED,
+                    "Reader public key is not in expected format"));
+        }
+        vector<uint8_t> pubKeyP256(readerPublicKey_.begin() + 1, readerPublicKey_.end());
+        if (!hwProxy_->calcMacKey(sessionTranscript_, pubKeyP256, signingKeyBlob, docType_,
+                                  numNamespacesWithValues, expectedDeviceNameSpacesSize_)) {
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_FAILED, "Error starting retrieving entries"));
+        }
+    }
 
     numStartRetrievalCalls_ += 1;
     return ndk::ScopedAStatus::ok();
@@ -520,7 +526,7 @@
     return 1 + cborNumBytesForLength(value.size()) + value.size();
 }
 
-size_t IdentityCredential::calcDeviceNameSpacesSize() {
+void IdentityCredential::calcDeviceNameSpacesSize(uint32_t accessControlProfileMask) {
     /*
      * This is how DeviceNameSpaces is defined:
      *
@@ -539,7 +545,7 @@
      * encoded.
      */
     size_t ret = 0;
-    size_t numNamespacesWithValues = 0;
+    vector<unsigned int> numEntriesPerNamespace;
     for (const RequestNamespace& rns : requestNamespaces_) {
         vector<RequestDataItem> itemsToInclude;
 
@@ -562,13 +568,9 @@
             //
             bool authorized = false;
             for (auto id : rdi.accessControlProfileIds) {
-                auto it = profileIdToAccessCheckResult_.find(id);
-                if (it != profileIdToAccessCheckResult_.end()) {
-                    int accessControlForProfile = it->second;
-                    if (accessControlForProfile == IIdentityCredentialStore::STATUS_OK) {
-                        authorized = true;
-                        break;
-                    }
+                if (accessControlProfileMask & (1 << id)) {
+                    authorized = true;
+                    break;
                 }
             }
             if (!authorized) {
@@ -578,7 +580,10 @@
             itemsToInclude.push_back(rdi);
         }
 
-        // If no entries are to be in the namespace, we don't include it...
+        numEntriesPerNamespace.push_back(itemsToInclude.size());
+
+        // If no entries are to be in the namespace, we don't include it in
+        // the CBOR...
         if (itemsToInclude.size() == 0) {
             continue;
         }
@@ -597,15 +602,14 @@
             // that.
             ret += item.size;
         }
-
-        numNamespacesWithValues++;
     }
 
-    // Now that we now the nunber of namespaces with values, we know how many
+    // Now that we know the number of namespaces with values, we know how many
     // bytes the DeviceNamespaces map in the beginning is going to take up.
-    ret += 1 + cborNumBytesForLength(numNamespacesWithValues);
+    ret += 1 + cborNumBytesForLength(numEntriesPerNamespace.size());
 
-    return ret;
+    expectedDeviceNameSpacesSize_ = ret;
+    expectedNumEntriesPerNamespace_ = numEntriesPerNamespace;
 }
 
 ndk::ScopedAStatus IdentityCredential::startRetrieveEntryValue(
@@ -626,9 +630,11 @@
                 "No more name spaces left to go through"));
     }
 
+    bool newNamespace;
     if (currentNameSpace_ == "") {
         // First call.
         currentNameSpace_ = nameSpace;
+        newNamespace = true;
     }
 
     if (nameSpace == currentNameSpace_) {
@@ -655,6 +661,7 @@
 
         requestCountsRemaining_.erase(requestCountsRemaining_.begin());
         currentNameSpace_ = nameSpace;
+        newNamespace = true;
     }
 
     // It's permissible to have an empty itemsRequest... but if non-empty you can
@@ -674,35 +681,52 @@
         }
     }
 
-    // Enforce access control.
-    //
-    // Access is granted if at least one of the profiles grants access.
-    //
-    // If an item is configured without any profiles, access is denied.
-    //
-    int accessControl = IIdentityCredentialStore::STATUS_NO_ACCESS_CONTROL_PROFILES;
-    for (auto id : accessControlProfileIds) {
-        auto search = profileIdToAccessCheckResult_.find(id);
-        if (search == profileIdToAccessCheckResult_.end()) {
+    unsigned int newNamespaceNumEntries = 0;
+    if (newNamespace) {
+        if (expectedNumEntriesPerNamespace_.size() == 0) {
             return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                     IIdentityCredentialStore::STATUS_INVALID_DATA,
-                    "Requested entry with unvalidated profile id"));
+                    "No more populated name spaces left to go through"));
         }
-        int accessControlForProfile = search->second;
-        if (accessControlForProfile == IIdentityCredentialStore::STATUS_OK) {
-            accessControl = IIdentityCredentialStore::STATUS_OK;
-            break;
-        }
-        accessControl = accessControlForProfile;
-    }
-    if (accessControl != IIdentityCredentialStore::STATUS_OK) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                int(accessControl), "Access control check failed"));
+        newNamespaceNumEntries = expectedNumEntriesPerNamespace_[0];
+        expectedNumEntriesPerNamespace_.erase(expectedNumEntriesPerNamespace_.begin());
     }
 
-    entryAdditionalData_ = entryCreateAdditionalData(nameSpace, name, accessControlProfileIds);
+    // Access control is enforced in the secure hardware.
+    //
+    // ... except for STATUS_NOT_IN_REQUEST_MESSAGE, that's handled above (TODO:
+    // consolidate).
+    //
+    AccessCheckResult res = hwProxy_->startRetrieveEntryValue(
+            nameSpace, name, newNamespaceNumEntries, entrySize, accessControlProfileIds);
+    switch (res) {
+        case AccessCheckResult::kOk:
+            /* Do nothing. */
+            break;
+        case AccessCheckResult::kFailed:
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_FAILED,
+                    "Access control check failed (failed)"));
+            break;
+        case AccessCheckResult::kNoAccessControlProfiles:
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_NO_ACCESS_CONTROL_PROFILES,
+                    "Access control check failed (no access control profiles)"));
+            break;
+        case AccessCheckResult::kUserAuthenticationFailed:
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_USER_AUTHENTICATION_FAILED,
+                    "Access control check failed (user auth)"));
+            break;
+        case AccessCheckResult::kReaderAuthenticationFailed:
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                    IIdentityCredentialStore::STATUS_READER_AUTHENTICATION_FAILED,
+                    "Access control check failed (reader auth)"));
+            break;
+    }
 
     currentName_ = name;
+    currentAccessControlProfileIds_ = accessControlProfileIds;
     entryRemainingBytes_ = entrySize;
     entryValue_.resize(0);
 
@@ -711,8 +735,8 @@
 
 ndk::ScopedAStatus IdentityCredential::retrieveEntryValue(const vector<uint8_t>& encryptedContent,
                                                           vector<uint8_t>* outContent) {
-    optional<vector<uint8_t>> content =
-            support::decryptAes128Gcm(storageKey_, encryptedContent, entryAdditionalData_);
+    optional<vector<uint8_t>> content = hwProxy_->retrieveEntryValue(
+            encryptedContent, currentNameSpace_, currentName_, currentAccessControlProfileIds_);
     if (!content) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_INVALID_DATA, "Error decrypting data"));
@@ -777,28 +801,14 @@
     optional<vector<uint8_t>> mac;
     if (signingKeyBlob_.size() > 0 && sessionTranscript_.size() > 0 &&
         readerPublicKey_.size() > 0) {
-        vector<uint8_t> docTypeAsBlob(docType_.begin(), docType_.end());
-        optional<vector<uint8_t>> signingKey =
-                support::decryptAes128Gcm(storageKey_, signingKeyBlob_, docTypeAsBlob);
-        if (!signingKey) {
+        optional<vector<uint8_t>> digestToBeMaced = hwProxy_->finishRetrieval();
+        if (!digestToBeMaced || digestToBeMaced.value().size() != 32) {
             return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                     IIdentityCredentialStore::STATUS_INVALID_DATA,
-                    "Error decrypting signingKeyBlob"));
+                    "Error generating digestToBeMaced"));
         }
-
-        vector<uint8_t> sessionTranscriptBytes = cppbor::Semantic(24, sessionTranscript_).encode();
-        optional<vector<uint8_t>> eMacKey =
-                support::calcEMacKey(signingKey.value(), readerPublicKey_, sessionTranscriptBytes);
-        if (!eMacKey) {
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_FAILED, "Error calculating EMacKey"));
-        }
-        mac = support::calcMac(sessionTranscript_, docType_, encodedDeviceNameSpaces,
-                               eMacKey.value());
-        if (!mac) {
-            return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                    IIdentityCredentialStore::STATUS_FAILED, "Error MACing data"));
-        }
+        // Now construct COSE_Mac0 from the returned MAC...
+        mac = support::coseMacWithDigest(digestToBeMaced.value(), {} /* data */);
     }
 
     *outMac = mac.value_or(vector<uint8_t>({}));
@@ -808,56 +818,18 @@
 
 ndk::ScopedAStatus IdentityCredential::generateSigningKeyPair(
         vector<uint8_t>* outSigningKeyBlob, Certificate* outSigningKeyCertificate) {
-    string serialDecimal = "1";
-    string issuer = "Android Identity Credential Key";
-    string subject = "Android Identity Credential Authentication Key";
-    time_t validityNotBefore = time(nullptr);
-    time_t validityNotAfter = validityNotBefore + 365 * 24 * 3600;
-
-    optional<vector<uint8_t>> signingKeyPKCS8 = support::createEcKeyPair();
-    if (!signingKeyPKCS8) {
+    time_t now = time(NULL);
+    optional<pair<vector<uint8_t>, vector<uint8_t>>> pair =
+            hwProxy_->generateSigningKeyPair(docType_, now);
+    if (!pair) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED, "Error creating signingKey"));
     }
 
-    optional<vector<uint8_t>> signingPublicKey =
-            support::ecKeyPairGetPublicKey(signingKeyPKCS8.value());
-    if (!signingPublicKey) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED,
-                "Error getting public part of signingKey"));
-    }
-
-    optional<vector<uint8_t>> signingKey = support::ecKeyPairGetPrivateKey(signingKeyPKCS8.value());
-    if (!signingKey) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED,
-                "Error getting private part of signingKey"));
-    }
-
-    optional<vector<uint8_t>> certificate = support::ecPublicKeyGenerateCertificate(
-            signingPublicKey.value(), credentialPrivKey_, serialDecimal, issuer, subject,
-            validityNotBefore, validityNotAfter);
-    if (!certificate) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error creating signingKey"));
-    }
-
-    optional<vector<uint8_t>> nonce = support::getRandom(12);
-    if (!nonce) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error getting random"));
-    }
-    vector<uint8_t> docTypeAsBlob(docType_.begin(), docType_.end());
-    optional<vector<uint8_t>> encryptedSigningKey = support::encryptAes128Gcm(
-            storageKey_, nonce.value(), signingKey.value(), docTypeAsBlob);
-    if (!encryptedSigningKey) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error encrypting signingKey"));
-    }
-    *outSigningKeyBlob = encryptedSigningKey.value();
     *outSigningKeyCertificate = Certificate();
-    outSigningKeyCertificate->encodedCertificate = certificate.value();
+    outSigningKeyCertificate->encodedCertificate = pair->first;
+
+    *outSigningKeyBlob = pair->second;
     return ndk::ScopedAStatus::ok();
 }
 
diff --git a/identity/aidl/default/IdentityCredential.h b/identity/aidl/default/common/IdentityCredential.h
similarity index 88%
rename from identity/aidl/default/IdentityCredential.h
rename to identity/aidl/default/common/IdentityCredential.h
index a8a6409..2281821 100644
--- a/identity/aidl/default/IdentityCredential.h
+++ b/identity/aidl/default/common/IdentityCredential.h
@@ -29,10 +29,15 @@
 
 #include <cppbor/cppbor.h>
 
+#include "IdentityCredentialStore.h"
+#include "SecureHardwareProxy.h"
+
 namespace aidl::android::hardware::identity {
 
 using ::aidl::android::hardware::keymaster::HardwareAuthToken;
 using ::aidl::android::hardware::keymaster::VerificationToken;
+using ::android::sp;
+using ::android::hardware::identity::SecureHardwarePresentationProxy;
 using ::std::map;
 using ::std::set;
 using ::std::string;
@@ -40,10 +45,11 @@
 
 class IdentityCredential : public BnIdentityCredential {
   public:
-    IdentityCredential(const vector<uint8_t>& credentialData)
-        : credentialData_(credentialData),
+    IdentityCredential(sp<SecureHardwarePresentationProxy> hwProxy,
+                       const vector<uint8_t>& credentialData)
+        : hwProxy_(hwProxy),
+          credentialData_(credentialData),
           numStartRetrievalCalls_(0),
-          authChallenge_(0),
           expectedDeviceNameSpacesSize_(0) {}
 
     // Parses and decrypts credentialData_, return a status code from
@@ -75,14 +81,13 @@
 
   private:
     // Set by constructor
+    sp<SecureHardwarePresentationProxy> hwProxy_;
     vector<uint8_t> credentialData_;
     int numStartRetrievalCalls_;
 
     // Set by initialize()
     string docType_;
     bool testCredential_;
-    vector<uint8_t> storageKey_;
-    vector<uint8_t> credentialPrivKey_;
 
     // Set by createEphemeralKeyPair()
     vector<uint8_t> ephemeralPublicKey_;
@@ -90,9 +95,6 @@
     // Set by setReaderEphemeralPublicKey()
     vector<uint8_t> readerPublicKey_;
 
-    // Set by createAuthChallenge()
-    uint64_t authChallenge_;
-
     // Set by setRequestedNamespaces()
     vector<RequestNamespace> requestNamespaces_;
 
@@ -100,7 +102,6 @@
     VerificationToken verificationToken_;
 
     // Set at startRetrieval() time.
-    map<int32_t, int> profileIdToAccessCheckResult_;
     vector<uint8_t> signingKeyBlob_;
     vector<uint8_t> sessionTranscript_;
     vector<uint8_t> itemsRequest_;
@@ -111,15 +112,16 @@
 
     // Calculated at startRetrieval() time.
     size_t expectedDeviceNameSpacesSize_;
+    vector<unsigned int> expectedNumEntriesPerNamespace_;
 
     // Set at startRetrieveEntryValue() time.
     string currentNameSpace_;
     string currentName_;
+    vector<int32_t> currentAccessControlProfileIds_;
     size_t entryRemainingBytes_;
     vector<uint8_t> entryValue_;
-    vector<uint8_t> entryAdditionalData_;
 
-    size_t calcDeviceNameSpacesSize();
+    void calcDeviceNameSpacesSize(uint32_t accessControlProfileMask);
 };
 
 }  // namespace aidl::android::hardware::identity
diff --git a/identity/aidl/default/IdentityCredentialStore.cpp b/identity/aidl/default/common/IdentityCredentialStore.cpp
similarity index 90%
rename from identity/aidl/default/IdentityCredentialStore.cpp
rename to identity/aidl/default/common/IdentityCredentialStore.cpp
index 30dc6f3..13f91aa 100644
--- a/identity/aidl/default/IdentityCredentialStore.cpp
+++ b/identity/aidl/default/common/IdentityCredentialStore.cpp
@@ -39,8 +39,9 @@
 ndk::ScopedAStatus IdentityCredentialStore::createCredential(
         const string& docType, bool testCredential,
         shared_ptr<IWritableIdentityCredential>* outWritableCredential) {
+    sp<SecureHardwareProvisioningProxy> hwProxy = hwProxyFactory_->createProvisioningProxy();
     shared_ptr<WritableIdentityCredential> wc =
-            ndk::SharedRefBase::make<WritableIdentityCredential>(docType, testCredential);
+            ndk::SharedRefBase::make<WritableIdentityCredential>(hwProxy, docType, testCredential);
     if (!wc->initialize()) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED,
@@ -60,8 +61,9 @@
                 "Unsupported cipher suite"));
     }
 
+    sp<SecureHardwarePresentationProxy> hwProxy = hwProxyFactory_->createPresentationProxy();
     shared_ptr<IdentityCredential> credential =
-            ndk::SharedRefBase::make<IdentityCredential>(credentialData);
+            ndk::SharedRefBase::make<IdentityCredential>(hwProxy, credentialData);
     auto ret = credential->initialize();
     if (ret != IIdentityCredentialStore::STATUS_OK) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
diff --git a/identity/aidl/default/IdentityCredentialStore.h b/identity/aidl/default/common/IdentityCredentialStore.h
similarity index 85%
rename from identity/aidl/default/IdentityCredentialStore.h
rename to identity/aidl/default/common/IdentityCredentialStore.h
index 4f3a421..d35e632 100644
--- a/identity/aidl/default/IdentityCredentialStore.h
+++ b/identity/aidl/default/common/IdentityCredentialStore.h
@@ -19,15 +19,20 @@
 
 #include <aidl/android/hardware/identity/BnIdentityCredentialStore.h>
 
+#include "SecureHardwareProxy.h"
+
 namespace aidl::android::hardware::identity {
 
+using ::android::sp;
+using ::android::hardware::identity::SecureHardwareProxyFactory;
 using ::std::shared_ptr;
 using ::std::string;
 using ::std::vector;
 
 class IdentityCredentialStore : public BnIdentityCredentialStore {
   public:
-    IdentityCredentialStore() {}
+    IdentityCredentialStore(sp<SecureHardwareProxyFactory> hwProxyFactory)
+        : hwProxyFactory_(hwProxyFactory) {}
 
     // The GCM chunk size used by this implementation is 64 KiB.
     static constexpr size_t kGcmChunkSize = 64 * 1024;
@@ -41,6 +46,9 @@
 
     ndk::ScopedAStatus getCredential(CipherSuite cipherSuite, const vector<uint8_t>& credentialData,
                                      shared_ptr<IIdentityCredential>* outCredential) override;
+
+  private:
+    sp<SecureHardwareProxyFactory> hwProxyFactory_;
 };
 
 }  // namespace aidl::android::hardware::identity
diff --git a/identity/aidl/default/common/SecureHardwareProxy.h b/identity/aidl/default/common/SecureHardwareProxy.h
new file mode 100644
index 0000000..b89ad87
--- /dev/null
+++ b/identity/aidl/default/common/SecureHardwareProxy.h
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_IDENTITY_SECUREHARDWAREPROXY_H
+#define ANDROID_HARDWARE_IDENTITY_SECUREHARDWAREPROXY_H
+
+#include <utils/RefBase.h>
+#include <optional>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::identity {
+
+using ::android::RefBase;
+using ::std::optional;
+using ::std::pair;
+using ::std::string;
+using ::std::vector;
+
+// These classes are used to communicate with Secure Hardware. They mimic the
+// API in libEmbeddedIC 1:1 (except for using C++ types) as each call is intended
+// to be forwarded to the Secure Hardware.
+//
+// Instances are instantiated when a provisioning or presentation session
+// starts. When the session is complete, the shutdown() method is called.
+//
+
+// Forward declare.
+//
+class SecureHardwareProvisioningProxy;
+class SecureHardwarePresentationProxy;
+
+// This is a class used to create proxies.
+//
+class SecureHardwareProxyFactory : public RefBase {
+  public:
+    SecureHardwareProxyFactory() {}
+    virtual ~SecureHardwareProxyFactory() {}
+
+    virtual sp<SecureHardwareProvisioningProxy> createProvisioningProxy() = 0;
+    virtual sp<SecureHardwarePresentationProxy> createPresentationProxy() = 0;
+};
+
+// The proxy used for provisioning.
+//
+class SecureHardwareProvisioningProxy : public RefBase {
+  public:
+    SecureHardwareProvisioningProxy() {}
+    virtual ~SecureHardwareProvisioningProxy() {}
+
+    virtual bool initialize(bool testCredential) = 0;
+
+    // Returns public key certificate chain with attestation.
+    //
+    // This must return an entire certificate chain and its implementation must
+    // be coordinated with the implementation of eicOpsCreateCredentialKey() on
+    // the TA side (which may return just a single certificate or the entire
+    // chain).
+    virtual optional<vector<uint8_t>> createCredentialKey(const vector<uint8_t>& challenge,
+                                                          const vector<uint8_t>& applicationId) = 0;
+
+    virtual bool startPersonalization(int accessControlProfileCount, vector<int> entryCounts,
+                                      const string& docType,
+                                      size_t expectedProofOfProvisioningSize) = 0;
+
+    // Returns MAC (28 bytes).
+    virtual optional<vector<uint8_t>> addAccessControlProfile(
+            int id, const vector<uint8_t>& readerCertificate, bool userAuthenticationRequired,
+            uint64_t timeoutMillis, uint64_t secureUserId) = 0;
+
+    virtual bool beginAddEntry(const vector<int>& accessControlProfileIds, const string& nameSpace,
+                               const string& name, uint64_t entrySize) = 0;
+
+    // Returns encryptedContent.
+    virtual optional<vector<uint8_t>> addEntryValue(const vector<int>& accessControlProfileIds,
+                                                    const string& nameSpace, const string& name,
+                                                    const vector<uint8_t>& content) = 0;
+
+    // Returns signatureOfToBeSigned (EIC_ECDSA_P256_SIGNATURE_SIZE bytes).
+    virtual optional<vector<uint8_t>> finishAddingEntries() = 0;
+
+    // Returns encryptedCredentialKeys (80 bytes).
+    virtual optional<vector<uint8_t>> finishGetCredentialData(const string& docType) = 0;
+
+    virtual bool shutdown() = 0;
+};
+
+enum AccessCheckResult {
+    kOk,
+    kFailed,
+    kNoAccessControlProfiles,
+    kUserAuthenticationFailed,
+    kReaderAuthenticationFailed,
+};
+
+// The proxy used for presentation.
+//
+class SecureHardwarePresentationProxy : public RefBase {
+  public:
+    SecureHardwarePresentationProxy() {}
+    virtual ~SecureHardwarePresentationProxy() {}
+
+    virtual bool initialize(bool testCredential, string docType,
+                            vector<uint8_t> encryptedCredentialKeys) = 0;
+
+    // Returns publicKeyCert (1st component) and signingKeyBlob (2nd component)
+    virtual optional<pair<vector<uint8_t>, vector<uint8_t>>> generateSigningKeyPair(string docType,
+                                                                                    time_t now) = 0;
+
+    // Returns private key
+    virtual optional<vector<uint8_t>> createEphemeralKeyPair() = 0;
+
+    virtual optional<uint64_t> createAuthChallenge() = 0;
+
+    virtual bool startRetrieveEntries() = 0;
+
+    virtual bool setAuthToken(uint64_t challenge, uint64_t secureUserId, uint64_t authenticatorId,
+                              int hardwareAuthenticatorType, uint64_t timeStamp,
+                              const vector<uint8_t>& mac, uint64_t verificationTokenChallenge,
+                              uint64_t verificationTokenTimestamp,
+                              int verificationTokenSecurityLevel,
+                              const vector<uint8_t>& verificationTokenMac) = 0;
+
+    virtual bool pushReaderCert(const vector<uint8_t>& certX509) = 0;
+
+    virtual optional<bool> validateAccessControlProfile(int id,
+                                                        const vector<uint8_t>& readerCertificate,
+                                                        bool userAuthenticationRequired,
+                                                        int timeoutMillis, uint64_t secureUserId,
+                                                        const vector<uint8_t>& mac) = 0;
+
+    virtual bool validateRequestMessage(const vector<uint8_t>& sessionTranscript,
+                                        const vector<uint8_t>& requestMessage, int coseSignAlg,
+                                        const vector<uint8_t>& readerSignatureOfToBeSigned) = 0;
+
+    virtual bool calcMacKey(const vector<uint8_t>& sessionTranscript,
+                            const vector<uint8_t>& readerEphemeralPublicKey,
+                            const vector<uint8_t>& signingKeyBlob, const string& docType,
+                            unsigned int numNamespacesWithValues,
+                            size_t expectedProofOfProvisioningSize) = 0;
+
+    virtual AccessCheckResult startRetrieveEntryValue(
+            const string& nameSpace, const string& name, unsigned int newNamespaceNumEntries,
+            int32_t entrySize, const vector<int32_t>& accessControlProfileIds) = 0;
+
+    virtual optional<vector<uint8_t>> retrieveEntryValue(
+            const vector<uint8_t>& encryptedContent, const string& nameSpace, const string& name,
+            const vector<int32_t>& accessControlProfileIds) = 0;
+
+    virtual optional<vector<uint8_t>> finishRetrieval();
+
+    virtual optional<vector<uint8_t>> deleteCredential(const string& docType,
+                                                       size_t proofOfDeletionCborSize) = 0;
+
+    virtual bool shutdown() = 0;
+};
+
+}  // namespace android::hardware::identity
+
+#endif  // ANDROID_HARDWARE_IDENTITY_SECUREHARDWAREPROXY_H
diff --git a/identity/aidl/default/WritableIdentityCredential.cpp b/identity/aidl/default/common/WritableIdentityCredential.cpp
similarity index 70%
rename from identity/aidl/default/WritableIdentityCredential.cpp
rename to identity/aidl/default/common/WritableIdentityCredential.cpp
index 141b4de..1328f36 100644
--- a/identity/aidl/default/WritableIdentityCredential.cpp
+++ b/identity/aidl/default/common/WritableIdentityCredential.cpp
@@ -17,7 +17,6 @@
 #define LOG_TAG "WritableIdentityCredential"
 
 #include "WritableIdentityCredential.h"
-#include "IdentityCredentialStore.h"
 
 #include <android/hardware/identity/support/IdentityCredentialSupport.h>
 
@@ -30,8 +29,8 @@
 #include <utility>
 
 #include "IdentityCredentialStore.h"
-#include "Util.h"
-#include "WritableIdentityCredential.h"
+
+#include "FakeSecureHardwareProxy.h"
 
 namespace aidl::android::hardware::identity {
 
@@ -40,74 +39,55 @@
 using namespace ::android::hardware::identity;
 
 bool WritableIdentityCredential::initialize() {
-    optional<vector<uint8_t>> random = support::getRandom(16);
-    if (!random) {
-        LOG(ERROR) << "Error creating storageKey";
+    if (!hwProxy_->initialize(testCredential_)) {
+        LOG(ERROR) << "hwProxy->initialize failed";
         return false;
     }
-    storageKey_ = random.value();
     startPersonalizationCalled_ = false;
     firstEntry_ = true;
 
     return true;
 }
 
-// This function generates the attestation certificate using the passed in
-// |attestationApplicationId| and |attestationChallenge|.  It will generate an
-// attestation certificate with current time and expires one year from now.  The
-// certificate shall contain all values as specified in hal.
+WritableIdentityCredential::~WritableIdentityCredential() {}
+
 ndk::ScopedAStatus WritableIdentityCredential::getAttestationCertificate(
-        const vector<uint8_t>& attestationApplicationId,  //
-        const vector<uint8_t>& attestationChallenge,      //
-        vector<Certificate>* outCertificateChain) {
-    if (!credentialPrivKey_.empty() || !credentialPubKey_.empty() || !certificateChain_.empty()) {
+        const vector<uint8_t>& attestationApplicationId,
+        const vector<uint8_t>& attestationChallenge, vector<Certificate>* outCertificateChain) {
+    if (getAttestationCertificateAlreadyCalled_) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED,
                 "Error attestation certificate previously generated"));
     }
+    getAttestationCertificateAlreadyCalled_ = true;
+
     if (attestationChallenge.empty()) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_INVALID_DATA, "Challenge can not be empty"));
     }
 
-    vector<uint8_t> challenge(attestationChallenge.begin(), attestationChallenge.end());
-    vector<uint8_t> appId(attestationApplicationId.begin(), attestationApplicationId.end());
-
-    optional<std::pair<vector<uint8_t>, vector<vector<uint8_t>>>> keyAttestationPair =
-            support::createEcKeyPairAndAttestation(challenge, appId, testCredential_);
-    if (!keyAttestationPair) {
-        LOG(ERROR) << "Error creating credentialKey and attestation";
+    optional<vector<uint8_t>> certChain =
+            hwProxy_->createCredentialKey(attestationChallenge, attestationApplicationId);
+    if (!certChain) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED,
-                "Error creating credentialKey and attestation"));
+                "Error generating attestation certificate chain"));
     }
 
-    vector<uint8_t> keyPair = keyAttestationPair.value().first;
-    certificateChain_ = keyAttestationPair.value().second;
-
-    optional<vector<uint8_t>> pubKey = support::ecKeyPairGetPublicKey(keyPair);
-    if (!pubKey) {
+    optional<vector<vector<uint8_t>>> certs = support::certificateChainSplit(certChain.value());
+    if (!certs) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED,
-                "Error getting public part of credentialKey"));
+                "Error splitting chain into separate certificates"));
     }
-    credentialPubKey_ = pubKey.value();
 
-    optional<vector<uint8_t>> privKey = support::ecKeyPairGetPrivateKey(keyPair);
-    if (!privKey) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED,
-                "Error getting private part of credentialKey"));
-    }
-    credentialPrivKey_ = privKey.value();
-
-    // convert from vector<vector<uint8_t>>> to vector<Certificate>*
     *outCertificateChain = vector<Certificate>();
-    for (const vector<uint8_t>& cert : certificateChain_) {
+    for (const vector<uint8_t>& cert : certs.value()) {
         Certificate c = Certificate();
         c.encodedCertificate = cert;
         outCertificateChain->push_back(std::move(c));
     }
+
     return ndk::ScopedAStatus::ok();
 }
 
@@ -123,8 +103,8 @@
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED, "startPersonalization called already"));
     }
-
     startPersonalizationCalled_ = true;
+
     numAccessControlProfileRemaining_ = accessControlProfileCount;
     remainingEntryCounts_ = entryCounts;
     entryNameSpace_ = "";
@@ -133,6 +113,12 @@
     signedDataNamespaces_ = cppbor::Map();
     signedDataCurrentNamespace_ = cppbor::Array();
 
+    if (!hwProxy_->startPersonalization(accessControlProfileCount, entryCounts, docType_,
+                                        expectedProofOfProvisioningSize_)) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "eicStartPersonalization"));
+    }
+
     return ndk::ScopedAStatus::ok();
 }
 
@@ -140,8 +126,6 @@
         int32_t id, const Certificate& readerCertificate, bool userAuthenticationRequired,
         int64_t timeoutMillis, int64_t secureUserId,
         SecureAccessControlProfile* outSecureAccessControlProfile) {
-    SecureAccessControlProfile profile;
-
     if (numAccessControlProfileRemaining_ == 0) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_INVALID_DATA,
@@ -169,25 +153,21 @@
                 "userAuthenticationRequired is false but timeout is non-zero"));
     }
 
-    // If |userAuthenticationRequired| is true, then |secureUserId| must be non-zero.
-    if (userAuthenticationRequired && secureUserId == 0) {
+    optional<vector<uint8_t>> mac = hwProxy_->addAccessControlProfile(
+            id, readerCertificate.encodedCertificate, userAuthenticationRequired, timeoutMillis,
+            secureUserId);
+    if (!mac) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_INVALID_DATA,
-                "userAuthenticationRequired is true but secureUserId is zero"));
+                IIdentityCredentialStore::STATUS_FAILED, "eicAddAccessControlProfile"));
     }
 
+    SecureAccessControlProfile profile;
     profile.id = id;
     profile.readerCertificate = readerCertificate;
     profile.userAuthenticationRequired = userAuthenticationRequired;
     profile.timeoutMillis = timeoutMillis;
     profile.secureUserId = secureUserId;
-    optional<vector<uint8_t>> mac = secureAccessControlProfileCalcMac(profile, storageKey_);
-    if (!mac) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error calculating MAC for profile"));
-    }
     profile.mac = mac.value();
-
     cppbor::Map profileMap;
     profileMap.add("id", profile.id);
     if (profile.readerCertificate.encodedCertificate.size() > 0) {
@@ -261,14 +241,18 @@
         remainingEntryCounts_[0] -= 1;
     }
 
-    entryAdditionalData_ = entryCreateAdditionalData(nameSpace, name, accessControlProfileIds);
-
     entryRemainingBytes_ = entrySize;
     entryNameSpace_ = nameSpace;
     entryName_ = name;
     entryAccessControlProfileIds_ = accessControlProfileIds;
     entryBytes_.resize(0);
     // LOG(INFO) << "name=" << name << " entrySize=" << entrySize;
+
+    if (!hwProxy_->beginAddEntry(accessControlProfileIds, nameSpace, name, entrySize)) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "eicBeginAddEntry"));
+    }
+
     return ndk::ScopedAStatus::ok();
 }
 
@@ -297,16 +281,11 @@
         }
     }
 
-    optional<vector<uint8_t>> nonce = support::getRandom(12);
-    if (!nonce) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error getting nonce"));
-    }
-    optional<vector<uint8_t>> encryptedContent =
-            support::encryptAes128Gcm(storageKey_, nonce.value(), content, entryAdditionalData_);
+    optional<vector<uint8_t>> encryptedContent = hwProxy_->addEntryValue(
+            entryAccessControlProfileIds_, entryNameSpace_, entryName_, content);
     if (!encryptedContent) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error encrypting content"));
+                IIdentityCredentialStore::STATUS_FAILED, "eicAddEntryValue"));
     }
 
     if (entryRemainingBytes_ == 0) {
@@ -332,50 +311,6 @@
     return ndk::ScopedAStatus::ok();
 }
 
-// Writes CBOR-encoded structure to |credentialKeys| containing |storageKey| and
-// |credentialPrivKey|.
-static bool generateCredentialKeys(const vector<uint8_t>& storageKey,
-                                   const vector<uint8_t>& credentialPrivKey,
-                                   vector<uint8_t>& credentialKeys) {
-    if (storageKey.size() != 16) {
-        LOG(ERROR) << "Size of storageKey is not 16";
-        return false;
-    }
-
-    cppbor::Array array;
-    array.add(cppbor::Bstr(storageKey));
-    array.add(cppbor::Bstr(credentialPrivKey));
-    credentialKeys = array.encode();
-    return true;
-}
-
-// Writes CBOR-encoded structure to |credentialData| containing |docType|,
-// |testCredential| and |credentialKeys|. The latter element will be stored in
-// encrypted form, using |hardwareBoundKey| as the encryption key.
-bool generateCredentialData(const vector<uint8_t>& hardwareBoundKey, const string& docType,
-                            bool testCredential, const vector<uint8_t>& credentialKeys,
-                            vector<uint8_t>& credentialData) {
-    optional<vector<uint8_t>> nonce = support::getRandom(12);
-    if (!nonce) {
-        LOG(ERROR) << "Error getting random";
-        return false;
-    }
-    vector<uint8_t> docTypeAsVec(docType.begin(), docType.end());
-    optional<vector<uint8_t>> credentialBlob = support::encryptAes128Gcm(
-            hardwareBoundKey, nonce.value(), credentialKeys, docTypeAsVec);
-    if (!credentialBlob) {
-        LOG(ERROR) << "Error encrypting CredentialKeys blob";
-        return false;
-    }
-
-    cppbor::Array array;
-    array.add(docType);
-    array.add(testCredential);
-    array.add(cppbor::Bstr(credentialBlob.value()));
-    credentialData = array.encode();
-    return true;
-}
-
 ndk::ScopedAStatus WritableIdentityCredential::finishAddingEntries(
         vector<uint8_t>* outCredentialData, vector<uint8_t>* outProofOfProvisioningSignature) {
     if (numAccessControlProfileRemaining_ != 0) {
@@ -411,31 +346,37 @@
                         .c_str()));
     }
 
-    optional<vector<uint8_t>> signature = support::coseSignEcDsa(credentialPrivKey_,
-                                                                 encodedCbor,  // payload
-                                                                 {},           // additionalData
-                                                                 {});          // certificateChain
+    optional<vector<uint8_t>> signatureOfToBeSigned = hwProxy_->finishAddingEntries();
+    if (!signatureOfToBeSigned) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
+                IIdentityCredentialStore::STATUS_FAILED, "eicFinishAddingEntries"));
+    }
+
+    optional<vector<uint8_t>> signature =
+            support::coseSignEcDsaWithSignature(signatureOfToBeSigned.value(),
+                                                encodedCbor,  // data
+                                                {});          // certificateChain
     if (!signature) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
                 IIdentityCredentialStore::STATUS_FAILED, "Error signing data"));
     }
 
-    vector<uint8_t> credentialKeys;
-    if (!generateCredentialKeys(storageKey_, credentialPrivKey_, credentialKeys)) {
+    optional<vector<uint8_t>> encryptedCredentialKeys = hwProxy_->finishGetCredentialData(docType_);
+    if (!encryptedCredentialKeys) {
         return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error generating CredentialKeys"));
+                IIdentityCredentialStore::STATUS_FAILED,
+                "Error generating encrypted CredentialKeys"));
     }
-
-    vector<uint8_t> credentialData;
-    if (!generateCredentialData(
-                testCredential_ ? support::getTestHardwareBoundKey() : getHardwareBoundKey(),
-                docType_, testCredential_, credentialKeys, credentialData)) {
-        return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
-                IIdentityCredentialStore::STATUS_FAILED, "Error generating CredentialData"));
-    }
+    cppbor::Array array;
+    array.add(docType_);
+    array.add(testCredential_);
+    array.add(encryptedCredentialKeys.value());
+    vector<uint8_t> credentialData = array.encode();
 
     *outCredentialData = credentialData;
     *outProofOfProvisioningSignature = signature.value();
+    hwProxy_->shutdown();
+
     return ndk::ScopedAStatus::ok();
 }
 
diff --git a/identity/aidl/default/WritableIdentityCredential.h b/identity/aidl/default/common/WritableIdentityCredential.h
similarity index 85%
rename from identity/aidl/default/WritableIdentityCredential.h
rename to identity/aidl/default/common/WritableIdentityCredential.h
index 5645852..c6f0628 100644
--- a/identity/aidl/default/WritableIdentityCredential.h
+++ b/identity/aidl/default/common/WritableIdentityCredential.h
@@ -23,16 +23,24 @@
 #include <cppbor.h>
 #include <set>
 
+#include "IdentityCredentialStore.h"
+#include "SecureHardwareProxy.h"
+
 namespace aidl::android::hardware::identity {
 
+using ::android::sp;
+using ::android::hardware::identity::SecureHardwareProvisioningProxy;
 using ::std::set;
 using ::std::string;
 using ::std::vector;
 
 class WritableIdentityCredential : public BnWritableIdentityCredential {
   public:
-    WritableIdentityCredential(const string& docType, bool testCredential)
-        : docType_(docType), testCredential_(testCredential) {}
+    WritableIdentityCredential(sp<SecureHardwareProvisioningProxy> hwProxy, const string& docType,
+                               bool testCredential)
+        : hwProxy_(hwProxy), docType_(docType), testCredential_(testCredential) {}
+
+    ~WritableIdentityCredential();
 
     // Creates the Credential Key. Returns false on failure. Must be called
     // right after construction.
@@ -57,7 +65,6 @@
     ndk::ScopedAStatus beginAddEntry(const vector<int32_t>& accessControlProfileIds,
                                      const string& nameSpace, const string& name,
                                      int32_t entrySize) override;
-
     ndk::ScopedAStatus addEntryValue(const vector<uint8_t>& content,
                                      vector<uint8_t>* outEncryptedContent) override;
 
@@ -66,18 +73,17 @@
             vector<uint8_t>* outProofOfProvisioningSignature) override;
 
   private:
+    // Set by constructor.
+    sp<SecureHardwareProvisioningProxy> hwProxy_;
     string docType_;
     bool testCredential_;
 
     // This is set in initialize().
-    vector<uint8_t> storageKey_;
     bool startPersonalizationCalled_;
     bool firstEntry_;
 
-    // These are set in getAttestationCertificate().
-    vector<uint8_t> credentialPrivKey_;
-    vector<uint8_t> credentialPubKey_;
-    vector<vector<uint8_t>> certificateChain_;
+    // This is set in getAttestationCertificate().
+    bool getAttestationCertificateAlreadyCalled_ = false;
 
     // These fields are initialized during startPersonalization()
     size_t numAccessControlProfileRemaining_;
@@ -92,7 +98,6 @@
 
     // These fields are initialized during beginAddEntry()
     size_t entryRemainingBytes_;
-    vector<uint8_t> entryAdditionalData_;
     string entryNameSpace_;
     string entryName_;
     vector<int32_t> entryAccessControlProfileIds_;
diff --git a/identity/aidl/default/identity-default.xml b/identity/aidl/default/identity-default.xml
index a47d354..37d5b81 100644
--- a/identity/aidl/default/identity-default.xml
+++ b/identity/aidl/default/identity-default.xml
@@ -1,6 +1,7 @@
 <manifest version="1.0" type="device">
     <hal format="aidl">
         <name>android.hardware.identity</name>
+        <version>2</version>
         <interface>
             <name>IIdentityCredentialStore</name>
             <instance>default</instance>
diff --git a/identity/aidl/default/libeic/EicCbor.c b/identity/aidl/default/libeic/EicCbor.c
new file mode 100644
index 0000000..ec049b1
--- /dev/null
+++ b/identity/aidl/default/libeic/EicCbor.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EicCbor.h"
+
+void eicCborInit(EicCbor* cbor, uint8_t* buffer, size_t bufferSize) {
+    cbor->size = 0;
+    cbor->bufferSize = bufferSize;
+    cbor->buffer = buffer;
+    cbor->digestType = EIC_CBOR_DIGEST_TYPE_SHA256;
+    eicOpsSha256Init(&cbor->digester.sha256);
+}
+
+void eicCborInitHmacSha256(EicCbor* cbor, uint8_t* buffer, size_t bufferSize,
+                           const uint8_t* hmacKey, size_t hmacKeySize) {
+    cbor->size = 0;
+    cbor->bufferSize = bufferSize;
+    cbor->buffer = buffer;
+    cbor->digestType = EIC_CBOR_DIGEST_TYPE_HMAC_SHA256;
+    eicOpsHmacSha256Init(&cbor->digester.hmacSha256, hmacKey, hmacKeySize);
+}
+
+void eicCborFinal(EicCbor* cbor, uint8_t digest[EIC_SHA256_DIGEST_SIZE]) {
+    switch (cbor->digestType) {
+        case EIC_CBOR_DIGEST_TYPE_SHA256:
+            eicOpsSha256Final(&cbor->digester.sha256, digest);
+            break;
+        case EIC_CBOR_DIGEST_TYPE_HMAC_SHA256:
+            eicOpsHmacSha256Final(&cbor->digester.hmacSha256, digest);
+            break;
+    }
+}
+
+void eicCborAppend(EicCbor* cbor, const uint8_t* data, size_t size) {
+    switch (cbor->digestType) {
+        case EIC_CBOR_DIGEST_TYPE_SHA256:
+            eicOpsSha256Update(&cbor->digester.sha256, data, size);
+            break;
+        case EIC_CBOR_DIGEST_TYPE_HMAC_SHA256:
+            eicOpsHmacSha256Update(&cbor->digester.hmacSha256, data, size);
+            break;
+    }
+
+    if (cbor->size >= cbor->bufferSize) {
+        cbor->size += size;
+        return;
+    }
+
+    size_t numBytesLeft = cbor->bufferSize - cbor->size;
+    size_t numBytesToCopy = size;
+    if (numBytesToCopy > numBytesLeft) {
+        numBytesToCopy = numBytesLeft;
+    }
+    eicMemCpy(cbor->buffer + cbor->size, data, numBytesToCopy);
+
+    cbor->size += size;
+}
+
+size_t eicCborAdditionalLengthBytesFor(size_t size) {
+    if (size < 24) {
+        return 0;
+    } else if (size <= 0xff) {
+        return 1;
+    } else if (size <= 0xffff) {
+        return 2;
+    } else if (size <= 0xffffffff) {
+        return 4;
+    }
+    return 8;
+}
+
+void eicCborBegin(EicCbor* cbor, int majorType, size_t size) {
+    uint8_t data[9];
+
+    if (size < 24) {
+        data[0] = (majorType << 5) | size;
+        eicCborAppend(cbor, data, 1);
+    } else if (size <= 0xff) {
+        data[0] = (majorType << 5) | 24;
+        data[1] = size;
+        eicCborAppend(cbor, data, 2);
+    } else if (size <= 0xffff) {
+        data[0] = (majorType << 5) | 25;
+        data[1] = size >> 8;
+        data[2] = size & 0xff;
+        eicCborAppend(cbor, data, 3);
+    } else if (size <= 0xffffffff) {
+        data[0] = (majorType << 5) | 26;
+        data[1] = (size >> 24) & 0xff;
+        data[2] = (size >> 16) & 0xff;
+        data[3] = (size >> 8) & 0xff;
+        data[4] = size & 0xff;
+        eicCborAppend(cbor, data, 5);
+    } else {
+        data[0] = (majorType << 5) | 24;
+        data[1] = (((uint64_t)size) >> 56) & 0xff;
+        data[2] = (((uint64_t)size) >> 48) & 0xff;
+        data[3] = (((uint64_t)size) >> 40) & 0xff;
+        data[4] = (((uint64_t)size) >> 32) & 0xff;
+        data[5] = (((uint64_t)size) >> 24) & 0xff;
+        data[6] = (((uint64_t)size) >> 16) & 0xff;
+        data[7] = (((uint64_t)size) >> 8) & 0xff;
+        data[8] = ((uint64_t)size) & 0xff;
+        eicCborAppend(cbor, data, 9);
+    }
+}
+
+void eicCborAppendByteString(EicCbor* cbor, const uint8_t* data, size_t dataSize) {
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, dataSize);
+    eicCborAppend(cbor, data, dataSize);
+}
+
+void eicCborAppendString(EicCbor* cbor, const char* str) {
+    size_t length = eicStrLen(str);
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_STRING, length);
+    eicCborAppend(cbor, (const uint8_t*)str, length);
+}
+
+void eicCborAppendSimple(EicCbor* cbor, uint8_t simpleValue) {
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_SIMPLE, simpleValue);
+}
+
+void eicCborAppendBool(EicCbor* cbor, bool value) {
+    uint8_t simpleValue = value ? EIC_CBOR_SIMPLE_VALUE_TRUE : EIC_CBOR_SIMPLE_VALUE_FALSE;
+    eicCborAppendSimple(cbor, simpleValue);
+}
+
+void eicCborAppendSemantic(EicCbor* cbor, uint64_t value) {
+    size_t encoded = value;
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_SEMANTIC, encoded);
+}
+
+void eicCborAppendUnsigned(EicCbor* cbor, uint64_t value) {
+    size_t encoded = value;
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_UNSIGNED, encoded);
+}
+
+void eicCborAppendNumber(EicCbor* cbor, int64_t value) {
+    if (value < 0) {
+        size_t encoded = -1 - value;
+        eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_NEGATIVE, encoded);
+    } else {
+        eicCborAppendUnsigned(cbor, value);
+    }
+}
+
+void eicCborAppendArray(EicCbor* cbor, size_t numElements) {
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_ARRAY, numElements);
+}
+
+void eicCborAppendMap(EicCbor* cbor, size_t numPairs) {
+    eicCborBegin(cbor, EIC_CBOR_MAJOR_TYPE_MAP, numPairs);
+}
+
+bool eicCborCalcAccessControl(EicCbor* cborBuilder, int id, const uint8_t* readerCertificate,
+                              size_t readerCertificateSize, bool userAuthenticationRequired,
+                              uint64_t timeoutMillis, uint64_t secureUserId) {
+    size_t numPairs = 1;
+    if (readerCertificateSize > 0) {
+        numPairs += 1;
+    }
+    if (userAuthenticationRequired) {
+        numPairs += 2;
+        if (secureUserId > 0) {
+            numPairs += 1;
+        }
+    }
+    eicCborAppendMap(cborBuilder, numPairs);
+    eicCborAppendString(cborBuilder, "id");
+    eicCborAppendUnsigned(cborBuilder, id);
+    if (readerCertificateSize > 0) {
+        eicCborAppendString(cborBuilder, "readerCertificate");
+        eicCborAppendByteString(cborBuilder, readerCertificate, readerCertificateSize);
+    }
+    if (userAuthenticationRequired) {
+        eicCborAppendString(cborBuilder, "userAuthenticationRequired");
+        eicCborAppendBool(cborBuilder, userAuthenticationRequired);
+        eicCborAppendString(cborBuilder, "timeoutMillis");
+        eicCborAppendUnsigned(cborBuilder, timeoutMillis);
+        if (secureUserId > 0) {
+            eicCborAppendString(cborBuilder, "secureUserId");
+            eicCborAppendUnsigned(cborBuilder, secureUserId);
+        }
+    }
+
+    if (cborBuilder->size > cborBuilder->bufferSize) {
+        eicDebug("Buffer for ACP CBOR is too small (%zd) - need %zd bytes", cborBuilder->bufferSize,
+                 cborBuilder->size);
+        return false;
+    }
+
+    return true;
+}
+
+bool eicCborCalcEntryAdditionalData(const int* accessControlProfileIds,
+                                    size_t numAccessControlProfileIds, const char* nameSpace,
+                                    const char* name, uint8_t* cborBuffer, size_t cborBufferSize,
+                                    size_t* outAdditionalDataCborSize,
+                                    uint8_t additionalDataSha256[EIC_SHA256_DIGEST_SIZE]) {
+    EicCbor cborBuilder;
+
+    eicCborInit(&cborBuilder, cborBuffer, cborBufferSize);
+    eicCborAppendMap(&cborBuilder, 3);
+    eicCborAppendString(&cborBuilder, "Namespace");
+    eicCborAppendString(&cborBuilder, nameSpace);
+    eicCborAppendString(&cborBuilder, "Name");
+    eicCborAppendString(&cborBuilder, name);
+    eicCborAppendString(&cborBuilder, "AccessControlProfileIds");
+    eicCborAppendArray(&cborBuilder, numAccessControlProfileIds);
+    for (size_t n = 0; n < numAccessControlProfileIds; n++) {
+        eicCborAppendNumber(&cborBuilder, accessControlProfileIds[n]);
+    }
+    if (cborBuilder.size > cborBufferSize) {
+        eicDebug("Not enough space for additionalData - buffer is only %zd bytes, content is %zd",
+                 cborBufferSize, cborBuilder.size);
+        return false;
+    }
+    if (outAdditionalDataCborSize != NULL) {
+        *outAdditionalDataCborSize = cborBuilder.size;
+    }
+    eicCborFinal(&cborBuilder, additionalDataSha256);
+    return true;
+}
diff --git a/identity/aidl/default/libeic/EicCbor.h b/identity/aidl/default/libeic/EicCbor.h
new file mode 100644
index 0000000..4686b38
--- /dev/null
+++ b/identity/aidl/default/libeic/EicCbor.h
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if !defined(EIC_INSIDE_LIBEIC_H) && !defined(EIC_COMPILATION)
+#error "Never include this file directly, include libeic.h instead."
+#endif
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_CBOR_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_CBOR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "EicOps.h"
+
+typedef enum {
+    EIC_CBOR_DIGEST_TYPE_SHA256,
+    EIC_CBOR_DIGEST_TYPE_HMAC_SHA256,
+} EicCborDigestType;
+
+/* EicCbor is a utility class to build CBOR data structures and calculate
+ * digests on the fly.
+ */
+typedef struct {
+    // Contains the size of the built CBOR, even if it exceeds bufferSize (will
+    // never write to buffer beyond bufferSize though)
+    size_t size;
+
+    // The size of the buffer. Is zero if no data is recorded in which case
+    // only digesting is performed.
+    size_t bufferSize;
+
+    // Whether we're producing a SHA-256 or HMAC-SHA256 digest.
+    EicCborDigestType digestType;
+
+    // The SHA-256 digester object.
+    union {
+        EicSha256Ctx sha256;
+        EicHmacSha256Ctx hmacSha256;
+    } digester;
+
+    // The buffer used for building up CBOR or NULL if bufferSize is 0.
+    uint8_t* buffer;
+} EicCbor;
+
+/* Initializes an EicCbor.
+ *
+ * The given buffer will be used, up to bufferSize.
+ *
+ * If bufferSize is 0, buffer may be NULL.
+ */
+void eicCborInit(EicCbor* cbor, uint8_t* buffer, size_t bufferSize);
+
+/* Like eicCborInit() but uses HMAC-SHA256 instead of SHA-256.
+ */
+void eicCborInitHmacSha256(EicCbor* cbor, uint8_t* buffer, size_t bufferSize,
+                           const uint8_t* hmacKey, size_t hmacKeySize);
+
+/* Finishes building CBOR and returns the digest. */
+void eicCborFinal(EicCbor* cbor, uint8_t digest[EIC_SHA256_DIGEST_SIZE]);
+
+/* Appends CBOR data to the EicCbor. */
+void eicCborAppend(EicCbor* cbor, const uint8_t* data, size_t size);
+
+#define EIC_CBOR_MAJOR_TYPE_UNSIGNED 0
+#define EIC_CBOR_MAJOR_TYPE_NEGATIVE 1
+#define EIC_CBOR_MAJOR_TYPE_BYTE_STRING 2
+#define EIC_CBOR_MAJOR_TYPE_STRING 3
+#define EIC_CBOR_MAJOR_TYPE_ARRAY 4
+#define EIC_CBOR_MAJOR_TYPE_MAP 5
+#define EIC_CBOR_MAJOR_TYPE_SEMANTIC 6
+#define EIC_CBOR_MAJOR_TYPE_SIMPLE 7
+
+#define EIC_CBOR_SIMPLE_VALUE_FALSE 20
+#define EIC_CBOR_SIMPLE_VALUE_TRUE 21
+
+#define EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR 24
+
+/* Begins a new CBOR value. */
+void eicCborBegin(EicCbor* cbor, int majorType, size_t size);
+
+/* Appends a bytestring. */
+void eicCborAppendByteString(EicCbor* cbor, const uint8_t* data, size_t dataSize);
+
+/* Appends a NUL-terminated UTF-8 string. */
+void eicCborAppendString(EicCbor* cbor, const char* str);
+
+/* Appends a simple value. */
+void eicCborAppendSimple(EicCbor* cbor, uint8_t simpleValue);
+
+/* Appends a boolean. */
+void eicCborAppendBool(EicCbor* cbor, bool value);
+
+/* Appends a semantic */
+void eicCborAppendSemantic(EicCbor* cbor, uint64_t value);
+
+/* Appends an unsigned number. */
+void eicCborAppendUnsigned(EicCbor* cbor, uint64_t value);
+
+/* Appends a number. */
+void eicCborAppendNumber(EicCbor* cbor, int64_t value);
+
+/* Starts appending an array.
+ *
+ * After this numElements CBOR elements must follow.
+ */
+void eicCborAppendArray(EicCbor* cbor, size_t numElements);
+
+/* Starts appending a map.
+ *
+ * After this numPairs pairs of CBOR elements must follow.
+ */
+void eicCborAppendMap(EicCbor* cbor, size_t numPairs);
+
+/* Calculates how many bytes are needed to store a size. */
+size_t eicCborAdditionalLengthBytesFor(size_t size);
+
+bool eicCborCalcAccessControl(EicCbor* cborBuilder, int id, const uint8_t* readerCertificate,
+                              size_t readerCertificateSize, bool userAuthenticationRequired,
+                              uint64_t timeoutMillis, uint64_t secureUserId);
+
+bool eicCborCalcEntryAdditionalData(const int* accessControlProfileIds,
+                                    size_t numAccessControlProfileIds, const char* nameSpace,
+                                    const char* name, uint8_t* cborBuffer, size_t cborBufferSize,
+                                    size_t* outAdditionalDataCborSize,
+                                    uint8_t additionalDataSha256[EIC_SHA256_DIGEST_SIZE]);
+
+// The maximum size of an encoded Secure Access Control Profile that we
+// support. Since the SACP may contain a reader certificate chain these can get
+// pretty big.
+//
+// Currently we allocate space on the stack for this structure which is why we
+// have a maximum size. We can get rid of the maximum size by incrementally
+// building/verifying the SACP. TODO: actually do this.
+//
+#define EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE 512
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_EIC_CBOR_H
diff --git a/identity/aidl/default/libeic/EicOps.h b/identity/aidl/default/libeic/EicOps.h
new file mode 100644
index 0000000..da4dabf
--- /dev/null
+++ b/identity/aidl/default/libeic/EicOps.h
@@ -0,0 +1,299 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if !defined(EIC_INSIDE_LIBEIC_H) && !defined(EIC_COMPILATION)
+#error "Never include this file directly, include libeic.h instead."
+#endif
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_OPS_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_OPS_H
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+// Uncomment or define if debug messages are needed.
+//
+//#define EIC_DEBUG
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// The following defines must be set to something appropriate
+//
+//   EIC_SHA256_CONTEXT_SIZE - the size of EicSha256Ctx
+//   EIC_HMAC_SHA256_CONTEXT_SIZE - the size of EicHmacSha256Ctx
+//
+// For example, if EicSha256Ctx is implemented using BoringSSL this would be defined
+// as sizeof(SHA256_CTX).
+//
+// We expect the implementation to provide a header file with the name
+// EicOpsImpl.h to do all this.
+//
+#include "EicOpsImpl.h"
+
+#define EIC_SHA256_DIGEST_SIZE 32
+
+// The size of a P-256 private key.
+//
+#define EIC_P256_PRIV_KEY_SIZE 32
+
+// The size of a P-256 public key in uncompressed form.
+//
+// The public key is stored in uncompressed form, first the X coordinate, then
+// the Y coordinate.
+//
+#define EIC_P256_PUB_KEY_SIZE 64
+
+// Size of one of the coordinates in a curve-point.
+//
+#define EIC_P256_COORDINATE_SIZE 32
+
+// The size of an ECSDA signature using P-256.
+//
+// The R and S values are stored here, first R then S.
+//
+#define EIC_ECDSA_P256_SIGNATURE_SIZE 64
+
+#define EIC_AES_128_KEY_SIZE 16
+
+// The following are definitions of implementation functions the
+// underlying platform must provide.
+//
+
+struct EicSha256Ctx {
+    uint8_t reserved[EIC_SHA256_CONTEXT_SIZE];
+};
+typedef struct EicSha256Ctx EicSha256Ctx;
+
+struct EicHmacSha256Ctx {
+    uint8_t reserved[EIC_HMAC_SHA256_CONTEXT_SIZE];
+};
+typedef struct EicHmacSha256Ctx EicHmacSha256Ctx;
+
+#ifdef EIC_DEBUG
+// Debug macro. Don't include a new-line in message.
+//
+#define eicDebug(...)                            \
+    do {                                         \
+        eicPrint("%s:%d: ", __FILE__, __LINE__); \
+        eicPrint(__VA_ARGS__);                   \
+        eicPrint("\n");                          \
+    } while (0)
+#else
+#define eicDebug(...) \
+    do {              \
+    } while (0)
+#endif
+
+// Prints message which should include new-line character. Can be no-op.
+//
+// Don't use this from code, use eicDebug() instead.
+//
+#ifdef EIC_DEBUG
+void eicPrint(const char* format, ...);
+#else
+inline void eicPrint(const char*, ...) {}
+#endif
+
+// Dumps data as pretty-printed hex. Can be no-op.
+//
+#ifdef EIC_DEBUG
+void eicHexdump(const char* message, const uint8_t* data, size_t dataSize);
+#else
+inline void eicHexdump(const char*, const uint8_t*, size_t) {}
+#endif
+
+// Pretty-prints encoded CBOR. Can be no-op.
+//
+// If a byte-string is larger than |maxBStrSize| its contents will not be
+// printed, instead the value of the form "<bstr size=1099016
+// sha1=ef549cca331f73dfae2090e6a37c04c23f84b07b>" will be printed. Pass zero
+// for |maxBStrSize| to disable this.
+//
+#ifdef EIC_DEBUG
+void eicCborPrettyPrint(const uint8_t* cborData, size_t cborDataSize, size_t maxBStrSize);
+#else
+inline void eicCborPrettyPrint(const uint8_t*, size_t, size_t) {}
+#endif
+
+// Memory setting, see memset(3).
+void* eicMemSet(void* s, int c, size_t n);
+
+// Memory copying, see memcpy(3).
+void* eicMemCpy(void* dest, const void* src, size_t n);
+
+// String length, see strlen(3).
+size_t eicStrLen(const char* s);
+
+// Memory compare, see CRYPTO_memcmp(3SSL)
+//
+// It takes an amount of time dependent on len, but independent of the contents of the
+// memory regions pointed to by s1 and s2.
+//
+int eicCryptoMemCmp(const void* s1, const void* s2, size_t n);
+
+// Random number generation.
+bool eicOpsRandom(uint8_t* buf, size_t numBytes);
+
+// If |testCredential| is true, returns the 128-bit AES Hardware-Bound Key (16 bytes).
+//
+// Otherwise returns all zeroes (16 bytes).
+//
+const uint8_t* eicOpsGetHardwareBoundKey(bool testCredential);
+
+// Encrypts |data| with |key| and |additionalAuthenticatedData| using |nonce|,
+// returns the resulting (nonce || ciphertext || tag) in |encryptedData| which
+// must be of size |dataSize| + 28.
+bool eicOpsEncryptAes128Gcm(
+        const uint8_t* key,    // Must be 16 bytes
+        const uint8_t* nonce,  // Must be 12 bytes
+        const uint8_t* data,   // May be NULL if size is 0
+        size_t dataSize,
+        const uint8_t* additionalAuthenticationData,  // May be NULL if size is 0
+        size_t additionalAuthenticationDataSize, uint8_t* encryptedData);
+
+// Decrypts |encryptedData| using |key| and |additionalAuthenticatedData|,
+// returns resulting plaintext in |data| must be of size |encryptedDataSize| - 28.
+//
+// The format of |encryptedData| must be as specified in the
+// encryptAes128Gcm() function.
+bool eicOpsDecryptAes128Gcm(const uint8_t* key,  // Must be 16 bytes
+                            const uint8_t* encryptedData, size_t encryptedDataSize,
+                            const uint8_t* additionalAuthenticationData,
+                            size_t additionalAuthenticationDataSize, uint8_t* data);
+
+// Creates an EC key using the P-256 curve. The private key is written to
+// |privateKey|. The public key is written to |publicKey|.
+//
+bool eicOpsCreateEcKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
+                       uint8_t publicKey[EIC_P256_PUB_KEY_SIZE]);
+
+// Generates CredentialKey plus an attestation certificate.
+//
+// The attestation certificate will be signed by the attestation keys the secure
+// area has been provisioned with. The given |challenge| and |applicationId|
+// will be used as will |testCredential|.
+//
+// The generated certificate will be in X.509 format and returned in |cert|
+// and |certSize| must be set to the size of this array and this function will
+// set it to the size of the certification chain on successfully return.
+//
+// This may return either a single certificate or an entire certificate
+// chain. If it returns only a single certificate, the implementation of
+// SecureHardwareProvisioningProxy::createCredentialKey() should amend the
+// remainder of the certificate chain on the HAL side.
+//
+bool eicOpsCreateCredentialKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE], const uint8_t* challenge,
+                               size_t challengeSize, const uint8_t* applicationId,
+                               size_t applicationIdSize, bool testCredential, uint8_t* cert,
+                               size_t* certSize);  // inout
+
+// Generate an X.509 certificate for the key identified by |publicKey| which
+// must be of the form returned by eicOpsCreateEcKey().
+//
+// The certificate will be signed by the key identified by |signingKey| which
+// must be of the form returned by eicOpsCreateEcKey().
+//
+bool eicOpsSignEcKey(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
+                     const uint8_t signingKey[EIC_P256_PRIV_KEY_SIZE], unsigned int serial,
+                     const char* issuerName, const char* subjectName, time_t validityNotBefore,
+                     time_t validityNotAfter, uint8_t* cert,
+                     size_t* certSize);  // inout
+
+// Uses |privateKey| to create an ECDSA signature of some data (the SHA-256 must
+// be given by |digestOfData|). Returns the signature in |signature|.
+//
+bool eicOpsEcDsa(const uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
+                 const uint8_t digestOfData[EIC_SHA256_DIGEST_SIZE],
+                 uint8_t signature[EIC_ECDSA_P256_SIGNATURE_SIZE]);
+
+// Performs Elliptic Curve Diffie-Helman.
+//
+bool eicOpsEcdh(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
+                const uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
+                uint8_t sharedSecret[EIC_P256_COORDINATE_SIZE]);
+
+// Performs HKDF.
+//
+bool eicOpsHkdf(const uint8_t* sharedSecret, size_t sharedSecretSize, const uint8_t* salt,
+                size_t saltSize, const uint8_t* info, size_t infoSize, uint8_t* output,
+                size_t outputSize);
+
+// SHA-256 functions.
+void eicOpsSha256Init(EicSha256Ctx* ctx);
+void eicOpsSha256Update(EicSha256Ctx* ctx, const uint8_t* data, size_t len);
+void eicOpsSha256Final(EicSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]);
+
+// HMAC SHA-256 functions.
+void eicOpsHmacSha256Init(EicHmacSha256Ctx* ctx, const uint8_t* key, size_t keySize);
+void eicOpsHmacSha256Update(EicHmacSha256Ctx* ctx, const uint8_t* data, size_t len);
+void eicOpsHmacSha256Final(EicHmacSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]);
+
+// Extracts the public key in the given X.509 certificate.
+//
+// If the key is not an EC key, this function fails.
+//
+// Otherwise the public key is stored in uncompressed form in |publicKey| which
+// size should be set in |publicKeySize|. On successful return |publicKeySize|
+// is set to the length of the key. If there is not enough space, the function
+// fails.
+//
+// (The public key returned is not necessarily a P-256 key, even if it is note
+// that its size is not EIC_P256_PUBLIC_KEY_SIZE because of the leading 0x04.)
+//
+bool eicOpsX509GetPublicKey(const uint8_t* x509Cert, size_t x509CertSize, uint8_t* publicKey,
+                            size_t* publicKeySize);
+
+// Checks that the X.509 certificate given by |x509Cert| is signed by the public
+// key given by |publicKey| which must be an EC key in uncompressed form (e.g.
+// same formatt as returned by eicOpsX509GetPublicKey()).
+//
+bool eicOpsX509CertSignedByPublicKey(const uint8_t* x509Cert, size_t x509CertSize,
+                                     const uint8_t* publicKey, size_t publicKeySize);
+
+// Checks that |signature| is a signature of some data (given by |digest|),
+// signed by the public key given by |publicKey|.
+//
+// The key must be an EC key in uncompressed form (e.g.  same format as returned
+// by eicOpsX509GetPublicKey()).
+//
+// The format of the signature is the same encoding as the 'signature' field of
+// COSE_Sign1 - that is, it's the R and S integers both with the same length as
+// the key-size.
+//
+// The size of digest must match the size of the key.
+//
+bool eicOpsEcDsaVerifyWithPublicKey(const uint8_t* digest, size_t digestSize,
+                                    const uint8_t* signature, size_t signatureSize,
+                                    const uint8_t* publicKey, size_t publicKeySize);
+
+// Validates that the passed in data constitutes a valid auth- and verification tokens.
+//
+bool eicOpsValidateAuthToken(uint64_t challenge, uint64_t secureUserId, uint64_t authenticatorId,
+                             int hardwareAuthenticatorType, uint64_t timeStamp, const uint8_t* mac,
+                             size_t macSize, uint64_t verificationTokenChallenge,
+                             uint64_t verificationTokenTimeStamp,
+                             int verificationTokenSecurityLevel,
+                             const uint8_t* verificationTokenMac, size_t verificationTokenMacSize);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_EIC_OPS_H
diff --git a/identity/aidl/default/libeic/EicPresentation.c b/identity/aidl/default/libeic/EicPresentation.c
new file mode 100644
index 0000000..d3f5556
--- /dev/null
+++ b/identity/aidl/default/libeic/EicPresentation.c
@@ -0,0 +1,728 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EicPresentation.h"
+
+#include <inttypes.h>
+
+bool eicPresentationInit(EicPresentation* ctx, bool testCredential, const char* docType,
+                         const uint8_t encryptedCredentialKeys[80]) {
+    uint8_t credentialKeys[52];
+
+    eicMemSet(ctx, '\0', sizeof(EicPresentation));
+
+    if (!eicOpsDecryptAes128Gcm(eicOpsGetHardwareBoundKey(testCredential), encryptedCredentialKeys,
+                                80,
+                                // DocType is the additionalAuthenticatedData
+                                (const uint8_t*)docType, eicStrLen(docType), credentialKeys)) {
+        eicDebug("Error decrypting CredentialKeys");
+        return false;
+    }
+
+    // It's supposed to look like this;
+    //
+    //         CredentialKeys = [
+    //              bstr,   ; storageKey, a 128-bit AES key
+    //              bstr    ; credentialPrivKey, the private key for credentialKey
+    //         ]
+    //
+    // where storageKey is 16 bytes and credentialPrivateKey is 32 bytes.
+    //
+    // So the first two bytes will be 0x82 0x50 indicating resp. an array of two elements
+    // and a bstr of 16 elements. Sixteen bytes later (offset 18 and 19) there will be
+    // a bstr of 32 bytes. It's encoded as two bytes 0x58 and 0x20.
+    //
+    if (credentialKeys[0] != 0x82 || credentialKeys[1] != 0x50 || credentialKeys[18] != 0x58 ||
+        credentialKeys[19] != 0x20) {
+        eicDebug("Invalid CBOR for CredentialKeys");
+        return false;
+    }
+    eicMemCpy(ctx->storageKey, credentialKeys + 2, EIC_AES_128_KEY_SIZE);
+    eicMemCpy(ctx->credentialPrivateKey, credentialKeys + 20, EIC_P256_PRIV_KEY_SIZE);
+    ctx->testCredential = testCredential;
+    return true;
+}
+
+bool eicPresentationGenerateSigningKeyPair(EicPresentation* ctx, const char* docType, time_t now,
+                                           uint8_t* publicKeyCert, size_t* publicKeyCertSize,
+                                           uint8_t signingKeyBlob[60]) {
+    uint8_t signingKeyPriv[EIC_P256_PRIV_KEY_SIZE];
+    uint8_t signingKeyPub[EIC_P256_PUB_KEY_SIZE];
+
+    if (!eicOpsCreateEcKey(signingKeyPriv, signingKeyPub)) {
+        eicDebug("Error creating signing key");
+        return false;
+    }
+
+    const int secondsInOneYear = 365 * 24 * 60 * 60;
+    time_t validityNotBefore = now;
+    time_t validityNotAfter = now + secondsInOneYear;  // One year from now.
+    if (!eicOpsSignEcKey(signingKeyPub, ctx->credentialPrivateKey, 1,
+                         "Android Identity Credential Key",                 // issuer CN
+                         "Android Identity Credential Authentication Key",  // subject CN
+                         validityNotBefore, validityNotAfter, publicKeyCert, publicKeyCertSize)) {
+        eicDebug("Error creating certificate for signing key");
+        return false;
+    }
+
+    uint8_t nonce[12];
+    if (!eicOpsRandom(nonce, 12)) {
+        eicDebug("Error getting random");
+        return false;
+    }
+    if (!eicOpsEncryptAes128Gcm(ctx->storageKey, nonce, signingKeyPriv, sizeof(signingKeyPriv),
+                                // DocType is the additionalAuthenticatedData
+                                (const uint8_t*)docType, eicStrLen(docType), signingKeyBlob)) {
+        eicDebug("Error encrypting signing key");
+        return false;
+    }
+
+    return true;
+}
+
+bool eicPresentationCreateEphemeralKeyPair(EicPresentation* ctx,
+                                           uint8_t ephemeralPrivateKey[EIC_P256_PRIV_KEY_SIZE]) {
+    uint8_t ephemeralPublicKey[EIC_P256_PUB_KEY_SIZE];
+    if (!eicOpsCreateEcKey(ctx->ephemeralPrivateKey, ephemeralPublicKey)) {
+        eicDebug("Error creating ephemeral key");
+        return false;
+    }
+    eicMemCpy(ephemeralPrivateKey, ctx->ephemeralPrivateKey, EIC_P256_PRIV_KEY_SIZE);
+    return true;
+}
+
+bool eicPresentationCreateAuthChallenge(EicPresentation* ctx, uint64_t* authChallenge) {
+    do {
+        if (!eicOpsRandom((uint8_t*)&(ctx->authChallenge), sizeof(uint64_t))) {
+            eicDebug("Failed generating random challenge");
+            return false;
+        }
+    } while (ctx->authChallenge == 0);
+    eicDebug("Created auth challenge %" PRIu64, ctx->authChallenge);
+    *authChallenge = ctx->authChallenge;
+    return true;
+}
+
+// From "COSE Algorithms" registry
+//
+#define COSE_ALG_ECDSA_256 -7
+
+bool eicPresentationValidateRequestMessage(EicPresentation* ctx, const uint8_t* sessionTranscript,
+                                           size_t sessionTranscriptSize,
+                                           const uint8_t* requestMessage, size_t requestMessageSize,
+                                           int coseSignAlg,
+                                           const uint8_t* readerSignatureOfToBeSigned,
+                                           size_t readerSignatureOfToBeSignedSize) {
+    if (ctx->readerPublicKeySize == 0) {
+        eicDebug("No public key for reader");
+        return false;
+    }
+
+    // Right now we only support ECDSA with SHA-256 (e.g. ES256).
+    //
+    if (coseSignAlg != COSE_ALG_ECDSA_256) {
+        eicDebug(
+                "COSE Signature algorithm for reader signature is %d, "
+                "only ECDSA with SHA-256 is supported right now",
+                coseSignAlg);
+        return false;
+    }
+
+    // What we're going to verify is the COSE ToBeSigned structure which
+    // looks like the following:
+    //
+    //   Sig_structure = [
+    //     context : "Signature" / "Signature1" / "CounterSignature",
+    //     body_protected : empty_or_serialized_map,
+    //     ? sign_protected : empty_or_serialized_map,
+    //     external_aad : bstr,
+    //     payload : bstr
+    //   ]
+    //
+    // So we're going to build that CBOR...
+    //
+    EicCbor cbor;
+    eicCborInit(&cbor, NULL, 0);
+    eicCborAppendArray(&cbor, 4);
+    eicCborAppendString(&cbor, "Signature1");
+
+    // The COSE Encoded protected headers is just a single field with
+    // COSE_LABEL_ALG (1) -> coseSignAlg (e.g. -7). For simplicitly we just
+    // hard-code the CBOR encoding:
+    static const uint8_t coseEncodedProtectedHeaders[] = {0xa1, 0x01, 0x26};
+    eicCborAppendByteString(&cbor, coseEncodedProtectedHeaders,
+                            sizeof(coseEncodedProtectedHeaders));
+
+    // External_aad is the empty bstr
+    static const uint8_t externalAad[0] = {};
+    eicCborAppendByteString(&cbor, externalAad, sizeof(externalAad));
+
+    // For the payload, the _encoded_ form follows here. We handle this by simply
+    // opening a bstr, and then writing the CBOR. This requires us to know the
+    // size of said bstr, ahead of time... the CBOR to be written is
+    //
+    //   ReaderAuthentication = [
+    //      "ReaderAuthentication",
+    //      SessionTranscript,
+    //      ItemsRequestBytes
+    //   ]
+    //
+    //   ItemsRequestBytes = #6.24(bstr .cbor ItemsRequest)
+    //
+    //   ReaderAuthenticationBytes = #6.24(bstr .cbor ReaderAuthentication)
+    //
+    // which is easily calculated below
+    //
+    size_t calculatedSize = 0;
+    calculatedSize += 1;  // Array of size 3
+    calculatedSize += 1;  // "ReaderAuthentication" less than 24 bytes
+    calculatedSize += sizeof("ReaderAuthentication") - 1;  // Don't include trailing NUL
+    calculatedSize += sessionTranscriptSize;               // Already CBOR encoded
+    calculatedSize += 2;  // Semantic tag EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR (24)
+    calculatedSize += 1 + eicCborAdditionalLengthBytesFor(requestMessageSize);
+    calculatedSize += requestMessageSize;
+
+    // However note that we're authenticating ReaderAuthenticationBytes which
+    // is a tagged bstr of the bytes of ReaderAuthentication. So need to get
+    // that in front.
+    size_t rabCalculatedSize = 0;
+    rabCalculatedSize += 2;  // Semantic tag EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR (24)
+    rabCalculatedSize += 1 + eicCborAdditionalLengthBytesFor(calculatedSize);
+    rabCalculatedSize += calculatedSize;
+
+    // Begin the bytestring for ReaderAuthenticationBytes;
+    eicCborBegin(&cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, rabCalculatedSize);
+
+    eicCborAppendSemantic(&cbor, EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR);
+
+    // Begins the bytestring for ReaderAuthentication;
+    eicCborBegin(&cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, calculatedSize);
+
+    // And now that we know the size, let's fill it in...
+    //
+    size_t payloadOffset = cbor.size;
+    eicCborBegin(&cbor, EIC_CBOR_MAJOR_TYPE_ARRAY, 3);
+    eicCborAppendString(&cbor, "ReaderAuthentication");
+    eicCborAppend(&cbor, sessionTranscript, sessionTranscriptSize);
+    eicCborAppendSemantic(&cbor, EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR);
+    eicCborBegin(&cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, requestMessageSize);
+    eicCborAppend(&cbor, requestMessage, requestMessageSize);
+
+    if (cbor.size != payloadOffset + calculatedSize) {
+        eicDebug("CBOR size is %zd but we expected %zd", cbor.size, payloadOffset + calculatedSize);
+        return false;
+    }
+    uint8_t toBeSignedDigest[EIC_SHA256_DIGEST_SIZE];
+    eicCborFinal(&cbor, toBeSignedDigest);
+
+    if (!eicOpsEcDsaVerifyWithPublicKey(
+                toBeSignedDigest, EIC_SHA256_DIGEST_SIZE, readerSignatureOfToBeSigned,
+                readerSignatureOfToBeSignedSize, ctx->readerPublicKey, ctx->readerPublicKeySize)) {
+        eicDebug("Request message is not signed by public key");
+        return false;
+    }
+    ctx->requestMessageValidated = true;
+    return true;
+}
+
+// Validates the next certificate in the reader certificate chain.
+bool eicPresentationPushReaderCert(EicPresentation* ctx, const uint8_t* certX509,
+                                   size_t certX509Size) {
+    // If we had a previous certificate, use its public key to validate this certificate.
+    if (ctx->readerPublicKeySize > 0) {
+        if (!eicOpsX509CertSignedByPublicKey(certX509, certX509Size, ctx->readerPublicKey,
+                                             ctx->readerPublicKeySize)) {
+            eicDebug("Certificate is not signed by public key in the previous certificate");
+            return false;
+        }
+    }
+
+    // Store the key of this certificate, this is used to validate the next certificate
+    // and also ACPs with certificates that use the same public key...
+    ctx->readerPublicKeySize = EIC_PRESENTATION_MAX_READER_PUBLIC_KEY_SIZE;
+    if (!eicOpsX509GetPublicKey(certX509, certX509Size, ctx->readerPublicKey,
+                                &ctx->readerPublicKeySize)) {
+        eicDebug("Error extracting public key from certificate");
+        return false;
+    }
+    if (ctx->readerPublicKeySize == 0) {
+        eicDebug("Zero-length public key in certificate");
+        return false;
+    }
+
+    return true;
+}
+
+bool eicPresentationSetAuthToken(EicPresentation* ctx, uint64_t challenge, uint64_t secureUserId,
+                                 uint64_t authenticatorId, int hardwareAuthenticatorType,
+                                 uint64_t timeStamp, const uint8_t* mac, size_t macSize,
+                                 uint64_t verificationTokenChallenge,
+                                 uint64_t verificationTokenTimestamp,
+                                 int verificationTokenSecurityLevel,
+                                 const uint8_t* verificationTokenMac,
+                                 size_t verificationTokenMacSize) {
+    if (!eicOpsValidateAuthToken(
+                challenge, secureUserId, authenticatorId, hardwareAuthenticatorType, timeStamp, mac,
+                macSize, verificationTokenChallenge, verificationTokenTimestamp,
+                verificationTokenSecurityLevel, verificationTokenMac, verificationTokenMacSize)) {
+        return false;
+    }
+    ctx->authTokenChallenge = challenge;
+    ctx->authTokenSecureUserId = secureUserId;
+    ctx->authTokenTimestamp = timeStamp;
+    ctx->verificationTokenTimestamp = verificationTokenTimestamp;
+    return true;
+}
+
+static bool checkUserAuth(EicPresentation* ctx, bool userAuthenticationRequired, int timeoutMillis,
+                          uint64_t secureUserId) {
+    if (!userAuthenticationRequired) {
+        return true;
+    }
+
+    if (secureUserId != ctx->authTokenSecureUserId) {
+        eicDebug("secureUserId in profile differs from userId in authToken");
+        return false;
+    }
+
+    if (timeoutMillis == 0) {
+        if (ctx->authTokenChallenge == 0) {
+            eicDebug("No challenge in authToken");
+            return false;
+        }
+
+        // If we didn't create a challenge, too bad but user auth with
+        // timeoutMillis set to 0 needs it.
+        if (ctx->authChallenge == 0) {
+            eicDebug("No challenge was created for this session");
+            return false;
+        }
+        if (ctx->authTokenChallenge != ctx->authChallenge) {
+            eicDebug("Challenge in authToken (%" PRIu64
+                     ") doesn't match the challenge "
+                     "that was created (%" PRIu64 ") for this session",
+                     ctx->authTokenChallenge, ctx->authChallenge);
+            return false;
+        }
+    }
+
+    uint64_t now = ctx->verificationTokenTimestamp;
+    if (ctx->authTokenTimestamp > now) {
+        eicDebug("Timestamp in authToken is in the future");
+        return false;
+    }
+
+    if (timeoutMillis > 0) {
+        if (now > ctx->authTokenTimestamp + timeoutMillis) {
+            eicDebug("Deadline for authToken is in the past");
+            return false;
+        }
+    }
+
+    return true;
+}
+
+static bool checkReaderAuth(EicPresentation* ctx, const uint8_t* readerCertificate,
+                            size_t readerCertificateSize) {
+    uint8_t publicKey[EIC_PRESENTATION_MAX_READER_PUBLIC_KEY_SIZE];
+    size_t publicKeySize;
+
+    if (readerCertificateSize == 0) {
+        return true;
+    }
+
+    // Remember in this case certificate equality is done by comparing public
+    // keys, not bitwise comparison of the certificates.
+    //
+    publicKeySize = EIC_PRESENTATION_MAX_READER_PUBLIC_KEY_SIZE;
+    if (!eicOpsX509GetPublicKey(readerCertificate, readerCertificateSize, publicKey,
+                                &publicKeySize)) {
+        eicDebug("Error extracting public key from certificate");
+        return false;
+    }
+    if (publicKeySize == 0) {
+        eicDebug("Zero-length public key in certificate");
+        return false;
+    }
+
+    if ((ctx->readerPublicKeySize != publicKeySize) ||
+        (eicCryptoMemCmp(ctx->readerPublicKey, publicKey, ctx->readerPublicKeySize) != 0)) {
+        return false;
+    }
+    return true;
+}
+
+// Note: This function returns false _only_ if an error occurred check for access, _not_
+// whether access is granted. Whether access is granted is returned in |accessGranted|.
+//
+bool eicPresentationValidateAccessControlProfile(EicPresentation* ctx, int id,
+                                                 const uint8_t* readerCertificate,
+                                                 size_t readerCertificateSize,
+                                                 bool userAuthenticationRequired, int timeoutMillis,
+                                                 uint64_t secureUserId, const uint8_t mac[28],
+                                                 bool* accessGranted) {
+    *accessGranted = false;
+
+    if (id < 0 || id >= 32) {
+        eicDebug("id value of %d is out of allowed range [0, 32[", id);
+        return false;
+    }
+
+    // Validate the MAC
+    uint8_t cborBuffer[EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE];
+    EicCbor cborBuilder;
+    eicCborInit(&cborBuilder, cborBuffer, EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE);
+    if (!eicCborCalcAccessControl(&cborBuilder, id, readerCertificate, readerCertificateSize,
+                                  userAuthenticationRequired, timeoutMillis, secureUserId)) {
+        return false;
+    }
+    if (!eicOpsDecryptAes128Gcm(ctx->storageKey, mac, 28, cborBuilder.buffer, cborBuilder.size,
+                                NULL)) {
+        eicDebug("MAC for AccessControlProfile doesn't match");
+        return false;
+    }
+
+    bool passedUserAuth =
+            checkUserAuth(ctx, userAuthenticationRequired, timeoutMillis, secureUserId);
+    bool passedReaderAuth = checkReaderAuth(ctx, readerCertificate, readerCertificateSize);
+
+    ctx->accessControlProfileMaskValidated |= (1 << id);
+    if (readerCertificateSize > 0) {
+        ctx->accessControlProfileMaskUsesReaderAuth |= (1 << id);
+    }
+    if (!passedReaderAuth) {
+        ctx->accessControlProfileMaskFailedReaderAuth |= (1 << id);
+    }
+    if (!passedUserAuth) {
+        ctx->accessControlProfileMaskFailedUserAuth |= (1 << id);
+    }
+
+    if (passedUserAuth && passedReaderAuth) {
+        *accessGranted = true;
+        eicDebug("Access granted for id %d", id);
+    }
+    return true;
+}
+
+bool eicPresentationCalcMacKey(EicPresentation* ctx, const uint8_t* sessionTranscript,
+                               size_t sessionTranscriptSize,
+                               const uint8_t readerEphemeralPublicKey[EIC_P256_PUB_KEY_SIZE],
+                               const uint8_t signingKeyBlob[60], const char* docType,
+                               unsigned int numNamespacesWithValues,
+                               size_t expectedDeviceNamespacesSize) {
+    uint8_t signingKeyPriv[EIC_P256_PRIV_KEY_SIZE];
+    if (!eicOpsDecryptAes128Gcm(ctx->storageKey, signingKeyBlob, 60, (const uint8_t*)docType,
+                                eicStrLen(docType), signingKeyPriv)) {
+        eicDebug("Error decrypting signingKeyBlob");
+        return false;
+    }
+
+    uint8_t sharedSecret[EIC_P256_COORDINATE_SIZE];
+    if (!eicOpsEcdh(readerEphemeralPublicKey, signingKeyPriv, sharedSecret)) {
+        eicDebug("ECDH failed");
+        return false;
+    }
+
+    EicCbor cbor;
+    eicCborInit(&cbor, NULL, 0);
+    eicCborAppendSemantic(&cbor, EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR);
+    eicCborAppendByteString(&cbor, sessionTranscript, sessionTranscriptSize);
+    uint8_t salt[EIC_SHA256_DIGEST_SIZE];
+    eicCborFinal(&cbor, salt);
+
+    const uint8_t info[7] = {'E', 'M', 'a', 'c', 'K', 'e', 'y'};
+    uint8_t derivedKey[32];
+    if (!eicOpsHkdf(sharedSecret, EIC_P256_COORDINATE_SIZE, salt, sizeof(salt), info, sizeof(info),
+                    derivedKey, sizeof(derivedKey))) {
+        eicDebug("HKDF failed");
+        return false;
+    }
+
+    eicCborInitHmacSha256(&ctx->cbor, NULL, 0, derivedKey, sizeof(derivedKey));
+    ctx->buildCbor = true;
+
+    // What we're going to calculate the HMAC-SHA256 is the COSE ToBeMaced
+    // structure which looks like the following:
+    //
+    // MAC_structure = [
+    //   context : "MAC" / "MAC0",
+    //   protected : empty_or_serialized_map,
+    //   external_aad : bstr,
+    //   payload : bstr
+    // ]
+    //
+    eicCborAppendArray(&ctx->cbor, 4);
+    eicCborAppendString(&ctx->cbor, "MAC0");
+
+    // The COSE Encoded protected headers is just a single field with
+    // COSE_LABEL_ALG (1) -> COSE_ALG_HMAC_256_256 (5). For simplicitly we just
+    // hard-code the CBOR encoding:
+    static const uint8_t coseEncodedProtectedHeaders[] = {0xa1, 0x01, 0x05};
+    eicCborAppendByteString(&ctx->cbor, coseEncodedProtectedHeaders,
+                            sizeof(coseEncodedProtectedHeaders));
+
+    // We currently don't support Externally Supplied Data (RFC 8152 section 4.3)
+    // so external_aad is the empty bstr
+    static const uint8_t externalAad[0] = {};
+    eicCborAppendByteString(&ctx->cbor, externalAad, sizeof(externalAad));
+
+    // For the payload, the _encoded_ form follows here. We handle this by simply
+    // opening a bstr, and then writing the CBOR. This requires us to know the
+    // size of said bstr, ahead of time... the CBOR to be written is
+    //
+    //   DeviceAuthentication = [
+    //      "DeviceAuthentication",
+    //      SessionTranscript,
+    //      DocType,                ; DocType as used in Documents structure in OfflineResponse
+    //      DeviceNameSpacesBytes
+    //   ]
+    //
+    //   DeviceNameSpacesBytes = #6.24(bstr .cbor DeviceNameSpaces)
+    //
+    //   DeviceAuthenticationBytes = #6.24(bstr .cbor DeviceAuthentication)
+    //
+    // which is easily calculated below
+    //
+    size_t calculatedSize = 0;
+    calculatedSize += 1;  // Array of size 4
+    calculatedSize += 1;  // "DeviceAuthentication" less than 24 bytes
+    calculatedSize += sizeof("DeviceAuthentication") - 1;  // Don't include trailing NUL
+    calculatedSize += sessionTranscriptSize;               // Already CBOR encoded
+    size_t docTypeLen = eicStrLen(docType);
+    calculatedSize += 1 + eicCborAdditionalLengthBytesFor(docTypeLen) + docTypeLen;
+    calculatedSize += 2;  // Semantic tag EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR (24)
+    calculatedSize += 1 + eicCborAdditionalLengthBytesFor(expectedDeviceNamespacesSize);
+    calculatedSize += expectedDeviceNamespacesSize;
+
+    // However note that we're authenticating DeviceAuthenticationBytes which
+    // is a tagged bstr of the bytes of DeviceAuthentication. So need to get
+    // that in front.
+    size_t dabCalculatedSize = 0;
+    dabCalculatedSize += 2;  // Semantic tag EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR (24)
+    dabCalculatedSize += 1 + eicCborAdditionalLengthBytesFor(calculatedSize);
+    dabCalculatedSize += calculatedSize;
+
+    // Begin the bytestring for DeviceAuthenticationBytes;
+    eicCborBegin(&ctx->cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, dabCalculatedSize);
+
+    eicCborAppendSemantic(&ctx->cbor, EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR);
+
+    // Begins the bytestring for DeviceAuthentication;
+    eicCborBegin(&ctx->cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, calculatedSize);
+
+    eicCborAppendArray(&ctx->cbor, 4);
+    eicCborAppendString(&ctx->cbor, "DeviceAuthentication");
+    eicCborAppend(&ctx->cbor, sessionTranscript, sessionTranscriptSize);
+    eicCborAppendString(&ctx->cbor, docType);
+
+    // For the payload, the _encoded_ form follows here. We handle this by simply
+    // opening a bstr, and then writing the CBOR. This requires us to know the
+    // size of said bstr, ahead of time.
+    eicCborAppendSemantic(&ctx->cbor, EIC_CBOR_SEMANTIC_TAG_ENCODED_CBOR);
+    eicCborBegin(&ctx->cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, expectedDeviceNamespacesSize);
+    ctx->expectedCborSizeAtEnd = expectedDeviceNamespacesSize + ctx->cbor.size;
+
+    eicCborAppendMap(&ctx->cbor, numNamespacesWithValues);
+    return true;
+}
+
+bool eicPresentationStartRetrieveEntries(EicPresentation* ctx) {
+    // HAL may use this object multiple times to retrieve data so need to reset various
+    // state objects here.
+    ctx->requestMessageValidated = false;
+    ctx->buildCbor = false;
+    ctx->accessControlProfileMaskValidated = 0;
+    ctx->accessControlProfileMaskUsesReaderAuth = 0;
+    ctx->accessControlProfileMaskFailedReaderAuth = 0;
+    ctx->accessControlProfileMaskFailedUserAuth = 0;
+    ctx->readerPublicKeySize = 0;
+    return true;
+}
+
+EicAccessCheckResult eicPresentationStartRetrieveEntryValue(
+        EicPresentation* ctx, const char* nameSpace, const char* name,
+        unsigned int newNamespaceNumEntries, int32_t /* entrySize */,
+        const int* accessControlProfileIds, size_t numAccessControlProfileIds,
+        uint8_t* scratchSpace, size_t scratchSpaceSize) {
+    uint8_t* additionalDataCbor = scratchSpace;
+    const size_t additionalDataCborBufSize = scratchSpaceSize;
+    size_t additionalDataCborSize;
+
+    if (newNamespaceNumEntries > 0) {
+        eicCborAppendString(&ctx->cbor, nameSpace);
+        eicCborAppendMap(&ctx->cbor, newNamespaceNumEntries);
+    }
+
+    // We'll need to calc and store a digest of additionalData to check that it's the same
+    // additionalData being passed in for every eicPresentationRetrieveEntryValue() call...
+    if (!eicCborCalcEntryAdditionalData(accessControlProfileIds, numAccessControlProfileIds,
+                                        nameSpace, name, additionalDataCbor,
+                                        additionalDataCborBufSize, &additionalDataCborSize,
+                                        ctx->additionalDataSha256)) {
+        return EIC_ACCESS_CHECK_RESULT_FAILED;
+    }
+
+    if (numAccessControlProfileIds == 0) {
+        return EIC_ACCESS_CHECK_RESULT_NO_ACCESS_CONTROL_PROFILES;
+    }
+
+    // Access is granted if at least one of the profiles grants access.
+    //
+    // If an item is configured without any profiles, access is denied.
+    //
+    EicAccessCheckResult result = EIC_ACCESS_CHECK_RESULT_FAILED;
+    for (size_t n = 0; n < numAccessControlProfileIds; n++) {
+        int id = accessControlProfileIds[n];
+        uint32_t idBitMask = (1 << id);
+
+        // If the access control profile wasn't validated, this is an error and we
+        // fail immediately.
+        bool validated = ((ctx->accessControlProfileMaskValidated & idBitMask) != 0);
+        if (!validated) {
+            eicDebug("No ACP for profile id %d", id);
+            return EIC_ACCESS_CHECK_RESULT_FAILED;
+        }
+
+        // Otherwise, we _did_ validate the profile. If none of the checks
+        // failed, we're done
+        bool failedUserAuth = ((ctx->accessControlProfileMaskFailedUserAuth & idBitMask) != 0);
+        bool failedReaderAuth = ((ctx->accessControlProfileMaskFailedReaderAuth & idBitMask) != 0);
+        if (!failedUserAuth && !failedReaderAuth) {
+            result = EIC_ACCESS_CHECK_RESULT_OK;
+            break;
+        }
+        // One of the checks failed, convey which one
+        if (failedUserAuth) {
+            result = EIC_ACCESS_CHECK_RESULT_USER_AUTHENTICATION_FAILED;
+        } else {
+            result = EIC_ACCESS_CHECK_RESULT_READER_AUTHENTICATION_FAILED;
+        }
+    }
+    eicDebug("Result %d for name %s", result, name);
+
+    if (result == EIC_ACCESS_CHECK_RESULT_OK) {
+        eicCborAppendString(&ctx->cbor, name);
+    }
+    return result;
+}
+
+// Note: |content| must be big enough to hold |encryptedContentSize| - 28 bytes.
+bool eicPresentationRetrieveEntryValue(EicPresentation* ctx, const uint8_t* encryptedContent,
+                                       size_t encryptedContentSize, uint8_t* content,
+                                       const char* nameSpace, const char* name,
+                                       const int* accessControlProfileIds,
+                                       size_t numAccessControlProfileIds, uint8_t* scratchSpace,
+                                       size_t scratchSpaceSize) {
+    uint8_t* additionalDataCbor = scratchSpace;
+    const size_t additionalDataCborBufSize = scratchSpaceSize;
+    size_t additionalDataCborSize;
+
+    uint8_t calculatedSha256[EIC_SHA256_DIGEST_SIZE];
+    if (!eicCborCalcEntryAdditionalData(accessControlProfileIds, numAccessControlProfileIds,
+                                        nameSpace, name, additionalDataCbor,
+                                        additionalDataCborBufSize, &additionalDataCborSize,
+                                        calculatedSha256)) {
+        return false;
+    }
+    if (eicCryptoMemCmp(calculatedSha256, ctx->additionalDataSha256, EIC_SHA256_DIGEST_SIZE) != 0) {
+        eicDebug("SHA-256 mismatch of additionalData");
+        return false;
+    }
+
+    if (!eicOpsDecryptAes128Gcm(ctx->storageKey, encryptedContent, encryptedContentSize,
+                                additionalDataCbor, additionalDataCborSize, content)) {
+        eicDebug("Error decrypting content");
+        return false;
+    }
+
+    eicCborAppend(&ctx->cbor, content, encryptedContentSize - 28);
+
+    return true;
+}
+
+bool eicPresentationFinishRetrieval(EicPresentation* ctx, uint8_t* digestToBeMaced,
+                                    size_t* digestToBeMacedSize) {
+    if (!ctx->buildCbor) {
+        *digestToBeMacedSize = 0;
+        return true;
+    }
+    if (*digestToBeMacedSize != 32) {
+        return false;
+    }
+
+    // This verifies that the correct expectedDeviceNamespacesSize value was
+    // passed in at eicPresentationCalcMacKey() time.
+    if (ctx->cbor.size != ctx->expectedCborSizeAtEnd) {
+        eicDebug("CBOR size is %zd, was expecting %zd", ctx->cbor.size, ctx->expectedCborSizeAtEnd);
+        return false;
+    }
+    eicCborFinal(&ctx->cbor, digestToBeMaced);
+    return true;
+}
+
+bool eicPresentationDeleteCredential(EicPresentation* ctx, const char* docType,
+                                     size_t proofOfDeletionCborSize,
+                                     uint8_t signatureOfToBeSigned[EIC_ECDSA_P256_SIGNATURE_SIZE]) {
+    EicCbor cbor;
+
+    eicCborInit(&cbor, NULL, 0);
+
+    // What we're going to sign is the COSE ToBeSigned structure which
+    // looks like the following:
+    //
+    // Sig_structure = [
+    //   context : "Signature" / "Signature1" / "CounterSignature",
+    //   body_protected : empty_or_serialized_map,
+    //   ? sign_protected : empty_or_serialized_map,
+    //   external_aad : bstr,
+    //   payload : bstr
+    //  ]
+    //
+    eicCborAppendArray(&cbor, 4);
+    eicCborAppendString(&cbor, "Signature1");
+
+    // The COSE Encoded protected headers is just a single field with
+    // COSE_LABEL_ALG (1) -> COSE_ALG_ECSDA_256 (-7). For simplicitly we just
+    // hard-code the CBOR encoding:
+    static const uint8_t coseEncodedProtectedHeaders[] = {0xa1, 0x01, 0x26};
+    eicCborAppendByteString(&cbor, coseEncodedProtectedHeaders,
+                            sizeof(coseEncodedProtectedHeaders));
+
+    // We currently don't support Externally Supplied Data (RFC 8152 section 4.3)
+    // so external_aad is the empty bstr
+    static const uint8_t externalAad[0] = {};
+    eicCborAppendByteString(&cbor, externalAad, sizeof(externalAad));
+
+    // For the payload, the _encoded_ form follows here. We handle this by simply
+    // opening a bstr, and then writing the CBOR. This requires us to know the
+    // size of said bstr, ahead of time.
+    eicCborBegin(&cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, proofOfDeletionCborSize);
+
+    // Finally, the CBOR that we're actually signing.
+    eicCborAppendArray(&cbor, 3);
+    eicCborAppendString(&cbor, "ProofOfDeletion");
+    eicCborAppendString(&cbor, docType);
+    eicCborAppendBool(&cbor, ctx->testCredential);
+
+    uint8_t cborSha256[EIC_SHA256_DIGEST_SIZE];
+    eicCborFinal(&cbor, cborSha256);
+    if (!eicOpsEcDsa(ctx->credentialPrivateKey, cborSha256, signatureOfToBeSigned)) {
+        eicDebug("Error signing proofOfDeletion");
+        return false;
+    }
+
+    return true;
+}
diff --git a/identity/aidl/default/libeic/EicPresentation.h b/identity/aidl/default/libeic/EicPresentation.h
new file mode 100644
index 0000000..d798962
--- /dev/null
+++ b/identity/aidl/default/libeic/EicPresentation.h
@@ -0,0 +1,229 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if !defined(EIC_INSIDE_LIBEIC_H) && !defined(EIC_COMPILATION)
+#error "Never include this file directly, include libeic.h instead."
+#endif
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_PRESENTATION_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_PRESENTATION_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "EicCbor.h"
+
+// The maximum size we support for public keys in reader certificates.
+#define EIC_PRESENTATION_MAX_READER_PUBLIC_KEY_SIZE 65
+
+typedef struct {
+    uint8_t storageKey[EIC_AES_128_KEY_SIZE];
+    uint8_t credentialPrivateKey[EIC_P256_PRIV_KEY_SIZE];
+
+    uint8_t ephemeralPrivateKey[EIC_P256_PRIV_KEY_SIZE];
+
+    // The challenge generated with eicPresentationCreateAuthChallenge()
+    uint64_t authChallenge;
+
+    // Set by eicPresentationSetAuthToken() and contains the fields
+    // from the passed in authToken and verificationToken.
+    //
+    uint64_t authTokenChallenge;
+    uint64_t authTokenSecureUserId;
+    uint64_t authTokenTimestamp;
+    uint64_t verificationTokenTimestamp;
+
+    // The public key for the reader.
+    //
+    // (During the process of pushing reader certificates, this is also used to store
+    // the public key of the previously pushed certificate.)
+    //
+    uint8_t readerPublicKey[EIC_PRESENTATION_MAX_READER_PUBLIC_KEY_SIZE];
+    size_t readerPublicKeySize;
+
+    // This is set to true only if eicPresentationValidateRequestMessage() successfully
+    // validated the requestMessage.
+    //
+    // Why even record this? Because there's no requirement the HAL actually calls that
+    // function and we validate ACPs before it's called... so it's possible that a
+    // compromised HAL could trick us into marking ACPs as authorized while they in fact
+    // aren't.
+    bool requestMessageValidated;
+    bool buildCbor;
+
+    // Set to true initialized as a test credential.
+    bool testCredential;
+
+    // These are bitmasks indicating which of the possible 32 access control profiles are
+    // authorized. They are built up by eicPresentationValidateAccessControlProfile().
+    //
+    uint32_t accessControlProfileMaskValidated;         // True if the profile was validated.
+    uint32_t accessControlProfileMaskUsesReaderAuth;    // True if the ACP is using reader auth
+    uint32_t accessControlProfileMaskFailedReaderAuth;  // True if failed reader auth
+    uint32_t accessControlProfileMaskFailedUserAuth;    // True if failed user auth
+
+    // SHA-256 for AdditionalData, updated for each entry.
+    uint8_t additionalDataSha256[EIC_SHA256_DIGEST_SIZE];
+
+    size_t expectedCborSizeAtEnd;
+    EicCbor cbor;
+} EicPresentation;
+
+bool eicPresentationInit(EicPresentation* ctx, bool testCredential, const char* docType,
+                         const uint8_t encryptedCredentialKeys[80]);
+
+bool eicPresentationGenerateSigningKeyPair(EicPresentation* ctx, const char* docType, time_t now,
+                                           uint8_t* publicKeyCert, size_t* publicKeyCertSize,
+                                           uint8_t signingKeyBlob[60]);
+
+// Create an ephemeral key-pair.
+//
+// The private key is stored in |ctx->ephemeralPrivateKey| and also returned in
+// |ephemeralPrivateKey|.
+//
+bool eicPresentationCreateEphemeralKeyPair(EicPresentation* ctx,
+                                           uint8_t ephemeralPrivateKey[EIC_P256_PRIV_KEY_SIZE]);
+
+// Returns a non-zero challenge in |authChallenge|.
+bool eicPresentationCreateAuthChallenge(EicPresentation* ctx, uint64_t* authChallenge);
+
+// Starts retrieveing entries.
+//
+bool eicPresentationStartRetrieveEntries(EicPresentation* ctx);
+
+// Sets the auth-token.
+bool eicPresentationSetAuthToken(EicPresentation* ctx, uint64_t challenge, uint64_t secureUserId,
+                                 uint64_t authenticatorId, int hardwareAuthenticatorType,
+                                 uint64_t timeStamp, const uint8_t* mac, size_t macSize,
+                                 uint64_t verificationTokenChallenge,
+                                 uint64_t verificationTokenTimeStamp,
+                                 int verificationTokenSecurityLevel,
+                                 const uint8_t* verificationTokenMac,
+                                 size_t verificationTokenMacSize);
+
+// Function to push certificates in the reader certificate chain.
+//
+// This should start with the root certificate (e.g. the last in the chain) and
+// continue up the chain, ending with the certificate for the reader.
+//
+// Calls to this function should be interleaved with calls to the
+// eicPresentationValidateAccessControlProfile() function, see below.
+//
+bool eicPresentationPushReaderCert(EicPresentation* ctx, const uint8_t* certX509,
+                                   size_t certX509Size);
+
+// Checks an access control profile.
+//
+// Returns false if an error occurred while checking the profile (e.g. MAC doesn't check out).
+//
+// Returns in |accessGranted| whether access is granted.
+//
+// If |readerCertificate| is non-empty and the public key of one of those
+// certificates appear in the chain presented by the reader, this function must
+// be called after pushing that certificate using
+// eicPresentationPushReaderCert().
+//
+bool eicPresentationValidateAccessControlProfile(EicPresentation* ctx, int id,
+                                                 const uint8_t* readerCertificate,
+                                                 size_t readerCertificateSize,
+                                                 bool userAuthenticationRequired, int timeoutMillis,
+                                                 uint64_t secureUserId, const uint8_t mac[28],
+                                                 bool* accessGranted);
+
+// Validates that the given requestMessage is signed by the public key in the
+// certificate last set with eicPresentationPushReaderCert().
+//
+// The format of the signature is the same encoding as the 'signature' field of
+// COSE_Sign1 - that is, it's the R and S integers both with the same length as
+// the key-size.
+//
+// Must be called after eicPresentationPushReaderCert() have been used to push
+// the final certificate. Which is the certificate of the reader itself.
+//
+bool eicPresentationValidateRequestMessage(EicPresentation* ctx, const uint8_t* sessionTranscript,
+                                           size_t sessionTranscriptSize,
+                                           const uint8_t* requestMessage, size_t requestMessageSize,
+                                           int coseSignAlg,
+                                           const uint8_t* readerSignatureOfToBeSigned,
+                                           size_t readerSignatureOfToBeSignedSize);
+
+typedef enum {
+    // Returned if access is granted.
+    EIC_ACCESS_CHECK_RESULT_OK,
+
+    // Returned if an error occurred checking for access.
+    EIC_ACCESS_CHECK_RESULT_FAILED,
+
+    // Returned if access was denied because item is configured without any
+    // access control profiles.
+    EIC_ACCESS_CHECK_RESULT_NO_ACCESS_CONTROL_PROFILES,
+
+    // Returned if access was denied because of user authentication.
+    EIC_ACCESS_CHECK_RESULT_USER_AUTHENTICATION_FAILED,
+
+    // Returned if access was denied because of reader authentication.
+    EIC_ACCESS_CHECK_RESULT_READER_AUTHENTICATION_FAILED,
+} EicAccessCheckResult;
+
+// Passes enough information to calculate the MACing key
+//
+bool eicPresentationCalcMacKey(EicPresentation* ctx, const uint8_t* sessionTranscript,
+                               size_t sessionTranscriptSize,
+                               const uint8_t readerEphemeralPublicKey[EIC_P256_PUB_KEY_SIZE],
+                               const uint8_t signingKeyBlob[60], const char* docType,
+                               unsigned int numNamespacesWithValues,
+                               size_t expectedDeviceNamespacesSize);
+
+// The scratchSpace should be set to a buffer at least 512 bytes (ideally 1024
+// bytes, the bigger the better). It's done this way to avoid allocating stack
+// space.
+//
+EicAccessCheckResult eicPresentationStartRetrieveEntryValue(
+        EicPresentation* ctx, const char* nameSpace, const char* name,
+        unsigned int newNamespaceNumEntries, int32_t entrySize, const int* accessControlProfileIds,
+        size_t numAccessControlProfileIds, uint8_t* scratchSpace, size_t scratchSpaceSize);
+
+// Note: |content| must be big enough to hold |encryptedContentSize| - 28 bytes.
+//
+// The scratchSpace should be set to a buffer at least 512 bytes. It's done this way to
+// avoid allocating stack space.
+//
+bool eicPresentationRetrieveEntryValue(EicPresentation* ctx, const uint8_t* encryptedContent,
+                                       size_t encryptedContentSize, uint8_t* content,
+                                       const char* nameSpace, const char* name,
+                                       const int* accessControlProfileIds,
+                                       size_t numAccessControlProfileIds, uint8_t* scratchSpace,
+                                       size_t scratchSpaceSize);
+
+// Returns the HMAC-SHA256 of |ToBeMaced| as per RFC 8051 "6.3. How to Compute
+// and Verify a MAC".
+bool eicPresentationFinishRetrieval(EicPresentation* ctx, uint8_t* digestToBeMaced,
+                                    size_t* digestToBeMacedSize);
+
+// The data returned in |signatureOfToBeSigned| contains the ECDSA signature of
+// the ToBeSigned CBOR from RFC 8051 "4.4. Signing and Verification Process"
+// where content is set to the ProofOfDeletion CBOR.
+//
+bool eicPresentationDeleteCredential(EicPresentation* ctx, const char* docType,
+                                     size_t proofOfDeletionCborSize,
+                                     uint8_t signatureOfToBeSigned[EIC_ECDSA_P256_SIGNATURE_SIZE]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_EIC_PRESENTATION_H
diff --git a/identity/aidl/default/libeic/EicProvisioning.c b/identity/aidl/default/libeic/EicProvisioning.c
new file mode 100644
index 0000000..f16605c
--- /dev/null
+++ b/identity/aidl/default/libeic/EicProvisioning.c
@@ -0,0 +1,290 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EicProvisioning.h"
+
+bool eicProvisioningInit(EicProvisioning* ctx, bool testCredential) {
+    eicMemSet(ctx, '\0', sizeof(EicProvisioning));
+    ctx->testCredential = testCredential;
+    if (!eicOpsRandom(ctx->storageKey, EIC_AES_128_KEY_SIZE)) {
+        return false;
+    }
+
+    return true;
+}
+
+bool eicProvisioningCreateCredentialKey(EicProvisioning* ctx, const uint8_t* challenge,
+                                        size_t challengeSize, const uint8_t* applicationId,
+                                        size_t applicationIdSize, uint8_t* publicKeyCert,
+                                        size_t* publicKeyCertSize) {
+    if (!eicOpsCreateCredentialKey(ctx->credentialPrivateKey, challenge, challengeSize,
+                                   applicationId, applicationIdSize, ctx->testCredential,
+                                   publicKeyCert, publicKeyCertSize)) {
+        return false;
+    }
+    return true;
+}
+
+bool eicProvisioningStartPersonalization(EicProvisioning* ctx, int accessControlProfileCount,
+                                         const int* entryCounts, size_t numEntryCounts,
+                                         const char* docType,
+                                         size_t expectedProofOfProvisioningSize) {
+    if (numEntryCounts >= EIC_MAX_NUM_NAMESPACES) {
+        return false;
+    }
+    if (accessControlProfileCount >= EIC_MAX_NUM_ACCESS_CONTROL_PROFILE_IDS) {
+        return false;
+    }
+
+    ctx->numEntryCounts = numEntryCounts;
+    if (numEntryCounts > EIC_MAX_NUM_NAMESPACES) {
+        return false;
+    }
+    for (size_t n = 0; n < numEntryCounts; n++) {
+        if (entryCounts[n] >= 256) {
+            return false;
+        }
+        ctx->entryCounts[n] = entryCounts[n];
+    }
+    ctx->curNamespace = -1;
+    ctx->curNamespaceNumProcessed = 0;
+
+    eicCborInit(&ctx->cbor, NULL, 0);
+
+    // What we're going to sign is the COSE ToBeSigned structure which
+    // looks like the following:
+    //
+    // Sig_structure = [
+    //   context : "Signature" / "Signature1" / "CounterSignature",
+    //   body_protected : empty_or_serialized_map,
+    //   ? sign_protected : empty_or_serialized_map,
+    //   external_aad : bstr,
+    //   payload : bstr
+    //  ]
+    //
+    eicCborAppendArray(&ctx->cbor, 4);
+    eicCborAppendString(&ctx->cbor, "Signature1");
+
+    // The COSE Encoded protected headers is just a single field with
+    // COSE_LABEL_ALG (1) -> COSE_ALG_ECSDA_256 (-7). For simplicitly we just
+    // hard-code the CBOR encoding:
+    static const uint8_t coseEncodedProtectedHeaders[] = {0xa1, 0x01, 0x26};
+    eicCborAppendByteString(&ctx->cbor, coseEncodedProtectedHeaders,
+                            sizeof(coseEncodedProtectedHeaders));
+
+    // We currently don't support Externally Supplied Data (RFC 8152 section 4.3)
+    // so external_aad is the empty bstr
+    static const uint8_t externalAad[0] = {};
+    eicCborAppendByteString(&ctx->cbor, externalAad, sizeof(externalAad));
+
+    // For the payload, the _encoded_ form follows here. We handle this by simply
+    // opening a bstr, and then writing the CBOR. This requires us to know the
+    // size of said bstr, ahead of time.
+    eicCborBegin(&ctx->cbor, EIC_CBOR_MAJOR_TYPE_BYTE_STRING, expectedProofOfProvisioningSize);
+    ctx->expectedCborSizeAtEnd = expectedProofOfProvisioningSize + ctx->cbor.size;
+
+    eicCborAppendArray(&ctx->cbor, 5);
+    eicCborAppendString(&ctx->cbor, "ProofOfProvisioning");
+    eicCborAppendString(&ctx->cbor, docType);
+
+    eicCborAppendArray(&ctx->cbor, accessControlProfileCount);
+
+    return true;
+}
+
+bool eicProvisioningAddAccessControlProfile(EicProvisioning* ctx, int id,
+                                            const uint8_t* readerCertificate,
+                                            size_t readerCertificateSize,
+                                            bool userAuthenticationRequired, uint64_t timeoutMillis,
+                                            uint64_t secureUserId, uint8_t outMac[28]) {
+    uint8_t cborBuffer[EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE];
+    EicCbor cborBuilder;
+
+    eicCborInit(&cborBuilder, cborBuffer, EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE);
+
+    if (!eicCborCalcAccessControl(&cborBuilder, id, readerCertificate, readerCertificateSize,
+                                  userAuthenticationRequired, timeoutMillis, secureUserId)) {
+        return false;
+    }
+
+    // Calculate and return MAC
+    uint8_t nonce[12];
+    if (!eicOpsRandom(nonce, 12)) {
+        return false;
+    }
+    if (!eicOpsEncryptAes128Gcm(ctx->storageKey, nonce, NULL, 0, cborBuilder.buffer,
+                                cborBuilder.size, outMac)) {
+        return false;
+    }
+
+    // The ACP CBOR in the provisioning receipt doesn't include secureUserId so build
+    // it again.
+    eicCborInit(&cborBuilder, cborBuffer, EIC_MAX_CBOR_SIZE_FOR_ACCESS_CONTROL_PROFILE);
+    if (!eicCborCalcAccessControl(&cborBuilder, id, readerCertificate, readerCertificateSize,
+                                  userAuthenticationRequired, timeoutMillis,
+                                  0 /* secureUserId */)) {
+        return false;
+    }
+
+    // Append the CBOR from the local builder to the digester.
+    eicCborAppend(&ctx->cbor, cborBuilder.buffer, cborBuilder.size);
+
+    return true;
+}
+
+bool eicProvisioningBeginAddEntry(EicProvisioning* ctx, const int* accessControlProfileIds,
+                                  size_t numAccessControlProfileIds, const char* nameSpace,
+                                  const char* name, uint64_t entrySize, uint8_t* scratchSpace,
+                                  size_t scratchSpaceSize) {
+    uint8_t* additionalDataCbor = scratchSpace;
+    const size_t additionalDataCborBufSize = scratchSpaceSize;
+    size_t additionalDataCborSize;
+
+    // We'll need to calc and store a digest of additionalData to check that it's the same
+    // additionalData being passed in for every eicProvisioningAddEntryValue() call...
+    if (!eicCborCalcEntryAdditionalData(accessControlProfileIds, numAccessControlProfileIds,
+                                        nameSpace, name, additionalDataCbor,
+                                        additionalDataCborBufSize, &additionalDataCborSize,
+                                        ctx->additionalDataSha256)) {
+        return false;
+    }
+
+    if (ctx->curNamespace == -1) {
+        ctx->curNamespace = 0;
+        ctx->curNamespaceNumProcessed = 0;
+        // Opens the main map: { * Namespace => [ + Entry ] }
+        eicCborAppendMap(&ctx->cbor, ctx->numEntryCounts);
+        eicCborAppendString(&ctx->cbor, nameSpace);
+        // Opens the per-namespace array: [ + Entry ]
+        eicCborAppendArray(&ctx->cbor, ctx->entryCounts[ctx->curNamespace]);
+    }
+
+    if (ctx->curNamespaceNumProcessed == ctx->entryCounts[ctx->curNamespace]) {
+        ctx->curNamespace += 1;
+        ctx->curNamespaceNumProcessed = 0;
+        eicCborAppendString(&ctx->cbor, nameSpace);
+        // Opens the per-namespace array: [ + Entry ]
+        eicCborAppendArray(&ctx->cbor, ctx->entryCounts[ctx->curNamespace]);
+    }
+
+    eicCborAppendMap(&ctx->cbor, 3);
+    eicCborAppendString(&ctx->cbor, "name");
+    eicCborAppendString(&ctx->cbor, name);
+
+    ctx->curEntrySize = entrySize;
+    ctx->curEntryNumBytesReceived = 0;
+
+    eicCborAppendString(&ctx->cbor, "value");
+
+    ctx->curNamespaceNumProcessed += 1;
+    return true;
+}
+
+bool eicProvisioningAddEntryValue(EicProvisioning* ctx, const int* accessControlProfileIds,
+                                  size_t numAccessControlProfileIds, const char* nameSpace,
+                                  const char* name, const uint8_t* content, size_t contentSize,
+                                  uint8_t* outEncryptedContent, uint8_t* scratchSpace,
+                                  size_t scratchSpaceSize) {
+    uint8_t* additionalDataCbor = scratchSpace;
+    const size_t additionalDataCborBufSize = scratchSpaceSize;
+    size_t additionalDataCborSize;
+
+    uint8_t calculatedSha256[EIC_SHA256_DIGEST_SIZE];
+    if (!eicCborCalcEntryAdditionalData(accessControlProfileIds, numAccessControlProfileIds,
+                                        nameSpace, name, additionalDataCbor,
+                                        additionalDataCborBufSize, &additionalDataCborSize,
+                                        calculatedSha256)) {
+        return false;
+    }
+    if (eicCryptoMemCmp(calculatedSha256, ctx->additionalDataSha256, EIC_SHA256_DIGEST_SIZE) != 0) {
+        eicDebug("SHA-256 mismatch of additionalData");
+        return false;
+    }
+
+    eicCborAppend(&ctx->cbor, content, contentSize);
+
+    uint8_t nonce[12];
+    if (!eicOpsRandom(nonce, 12)) {
+        return false;
+    }
+    if (!eicOpsEncryptAes128Gcm(ctx->storageKey, nonce, content, contentSize, additionalDataCbor,
+                                additionalDataCborSize, outEncryptedContent)) {
+        return false;
+    }
+
+    // If done with this entry, close the map
+    ctx->curEntryNumBytesReceived += contentSize;
+    if (ctx->curEntryNumBytesReceived == ctx->curEntrySize) {
+        eicCborAppendString(&ctx->cbor, "accessControlProfiles");
+        eicCborAppendArray(&ctx->cbor, numAccessControlProfileIds);
+        for (size_t n = 0; n < numAccessControlProfileIds; n++) {
+            eicCborAppendNumber(&ctx->cbor, accessControlProfileIds[n]);
+        }
+    }
+    return true;
+}
+
+bool eicProvisioningFinishAddingEntries(
+        EicProvisioning* ctx, uint8_t signatureOfToBeSigned[EIC_ECDSA_P256_SIGNATURE_SIZE]) {
+    uint8_t cborSha256[EIC_SHA256_DIGEST_SIZE];
+
+    eicCborAppendBool(&ctx->cbor, ctx->testCredential);
+    eicCborFinal(&ctx->cbor, cborSha256);
+
+    // This verifies that the correct expectedProofOfProvisioningSize value was
+    // passed in at eicStartPersonalization() time.
+    if (ctx->cbor.size != ctx->expectedCborSizeAtEnd) {
+        eicDebug("CBOR size is %zd, was expecting %zd", ctx->cbor.size, ctx->expectedCborSizeAtEnd);
+        return false;
+    }
+
+    if (!eicOpsEcDsa(ctx->credentialPrivateKey, cborSha256, signatureOfToBeSigned)) {
+        eicDebug("Error signing proofOfProvisioning");
+        return false;
+    }
+
+    return true;
+}
+
+bool eicProvisioningFinishGetCredentialData(EicProvisioning* ctx, const char* docType,
+                                            uint8_t encryptedCredentialKeys[80]) {
+    EicCbor cbor;
+    uint8_t cborBuf[52];
+
+    eicCborInit(&cbor, cborBuf, sizeof(cborBuf));
+    eicCborAppendArray(&cbor, 2);
+    eicCborAppendByteString(&cbor, ctx->storageKey, EIC_AES_128_KEY_SIZE);
+    eicCborAppendByteString(&cbor, ctx->credentialPrivateKey, EIC_P256_PRIV_KEY_SIZE);
+    if (cbor.size > sizeof(cborBuf)) {
+        eicDebug("Exceeded buffer size");
+        return false;
+    }
+
+    uint8_t nonce[12];
+    if (!eicOpsRandom(nonce, 12)) {
+        eicDebug("Error getting random");
+        return false;
+    }
+    if (!eicOpsEncryptAes128Gcm(
+                eicOpsGetHardwareBoundKey(ctx->testCredential), nonce, cborBuf, cbor.size,
+                // DocType is the additionalAuthenticatedData
+                (const uint8_t*)docType, eicStrLen(docType), encryptedCredentialKeys)) {
+        eicDebug("Error encrypting CredentialKeys");
+        return false;
+    }
+
+    return true;
+}
diff --git a/identity/aidl/default/libeic/EicProvisioning.h b/identity/aidl/default/libeic/EicProvisioning.h
new file mode 100644
index 0000000..836d16e
--- /dev/null
+++ b/identity/aidl/default/libeic/EicProvisioning.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if !defined(EIC_INSIDE_LIBEIC_H) && !defined(EIC_COMPILATION)
+#error "Never include this file directly, include libeic.h instead."
+#endif
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "EicCbor.h"
+
+#define EIC_MAX_NUM_NAMESPACES 32
+#define EIC_MAX_NUM_ACCESS_CONTROL_PROFILE_IDS 32
+
+typedef struct {
+    // Set by eicCreateCredentialKey.
+    uint8_t credentialPrivateKey[EIC_P256_PRIV_KEY_SIZE];
+
+    int numEntryCounts;
+    uint8_t entryCounts[EIC_MAX_NUM_NAMESPACES];
+
+    int curNamespace;
+    int curNamespaceNumProcessed;
+
+    size_t curEntrySize;
+    size_t curEntryNumBytesReceived;
+
+    uint8_t storageKey[EIC_AES_128_KEY_SIZE];
+
+    size_t expectedCborSizeAtEnd;
+
+    // SHA-256 for AdditionalData, updated for each entry.
+    uint8_t additionalDataSha256[EIC_SHA256_DIGEST_SIZE];
+
+    EicCbor cbor;
+
+    bool testCredential;
+} EicProvisioning;
+
+bool eicProvisioningInit(EicProvisioning* ctx, bool testCredential);
+
+bool eicProvisioningCreateCredentialKey(EicProvisioning* ctx, const uint8_t* challenge,
+                                        size_t challengeSize, const uint8_t* applicationId,
+                                        size_t applicationIdSize, uint8_t* publicKeyCert,
+                                        size_t* publicKeyCertSize);
+
+bool eicProvisioningStartPersonalization(EicProvisioning* ctx, int accessControlProfileCount,
+                                         const int* entryCounts, size_t numEntryCounts,
+                                         const char* docType,
+                                         size_t expectedProofOfProvisioningingSize);
+
+bool eicProvisioningAddAccessControlProfile(EicProvisioning* ctx, int id,
+                                            const uint8_t* readerCertificate,
+                                            size_t readerCertificateSize,
+                                            bool userAuthenticationRequired, uint64_t timeoutMillis,
+                                            uint64_t secureUserId, uint8_t outMac[28]);
+
+// The scratchSpace should be set to a buffer at least 512 bytes. It's done this way to
+// avoid allocating stack space.
+//
+bool eicProvisioningBeginAddEntry(EicProvisioning* ctx, const int* accessControlProfileIds,
+                                  size_t numAccessControlProfileIds, const char* nameSpace,
+                                  const char* name, uint64_t entrySize, uint8_t* scratchSpace,
+                                  size_t scratchSpaceSize);
+
+// The outEncryptedContent array must be contentSize + 28 bytes long.
+//
+// The scratchSpace should be set to a buffer at least 512 bytes. It's done this way to
+// avoid allocating stack space.
+//
+bool eicProvisioningAddEntryValue(EicProvisioning* ctx, const int* accessControlProfileIds,
+                                  size_t numAccessControlProfileIds, const char* nameSpace,
+                                  const char* name, const uint8_t* content, size_t contentSize,
+                                  uint8_t* outEncryptedContent, uint8_t* scratchSpace,
+                                  size_t scratchSpaceSize);
+
+// The data returned in |signatureOfToBeSigned| contains the ECDSA signature of
+// the ToBeSigned CBOR from RFC 8051 "4.4. Signing and Verification Process"
+// where content is set to the ProofOfProvisioninging CBOR.
+//
+bool eicProvisioningFinishAddingEntries(
+        EicProvisioning* ctx, uint8_t signatureOfToBeSigned[EIC_ECDSA_P256_SIGNATURE_SIZE]);
+
+//
+//
+// The |encryptedCredentialKeys| array is set to AES-GCM-ENC(HBK, R, CredentialKeys, docType)
+// where
+//
+//   CredentialKeys = [
+//     bstr,   ; storageKey, a 128-bit AES key
+//     bstr    ; credentialPrivKey, the private key for credentialKey
+//   ]
+//
+// Since |storageKey| is 16 bytes and |credentialPrivKey| is 32 bytes, the
+// encoded CBOR for CredentialKeys is 52 bytes and consequently
+// |encryptedCredentialKeys| will be 52 + 28 = 80 bytes.
+//
+bool eicProvisioningFinishGetCredentialData(EicProvisioning* ctx, const char* docType,
+                                            uint8_t encryptedCredentialKeys[80]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H
diff --git a/identity/aidl/default/libeic/libeic.h b/identity/aidl/default/libeic/libeic.h
new file mode 100644
index 0000000..88abef8
--- /dev/null
+++ b/identity/aidl/default/libeic/libeic.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_IDENTITY_LIBEIC_H
+#define ANDROID_HARDWARE_IDENTITY_LIBEIC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The EIC_INSIDE_LIBEIC_H preprocessor symbol is used to enforce
+ * library users to include only this file. All public interfaces, and
+ * only public interfaces, must be included here.
+ */
+#define EIC_INSIDE_LIBEIC_H
+#include "EicCbor.h"
+#include "EicOps.h"
+#include "EicPresentation.h"
+#include "EicProvisioning.h"
+#undef EIC_INSIDE_LIBEIC_H
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ANDROID_HARDWARE_IDENTITY_LIBEIC_H
diff --git a/identity/aidl/default/service.cpp b/identity/aidl/default/service.cpp
index bf95df5..c290c08 100644
--- a/identity/aidl/default/service.cpp
+++ b/identity/aidl/default/service.cpp
@@ -22,20 +22,26 @@
 
 #include "IdentityCredentialStore.h"
 
+#include "FakeSecureHardwareProxy.h"
+
+using ::android::sp;
 using ::android::base::InitLogging;
 using ::android::base::StderrLogger;
 
-using aidl::android::hardware::identity::IdentityCredentialStore;
+using ::aidl::android::hardware::identity::IdentityCredentialStore;
+using ::android::hardware::identity::FakeSecureHardwareProxyFactory;
+using ::android::hardware::identity::SecureHardwareProxyFactory;
 
 int main(int /*argc*/, char* argv[]) {
     InitLogging(argv, StderrLogger);
 
+    sp<SecureHardwareProxyFactory> hwProxyFactory = new FakeSecureHardwareProxyFactory();
+
     ABinderProcess_setThreadPoolMaxThreadCount(0);
     std::shared_ptr<IdentityCredentialStore> store =
-            ndk::SharedRefBase::make<IdentityCredentialStore>();
+            ndk::SharedRefBase::make<IdentityCredentialStore>(hwProxyFactory);
 
     const std::string instance = std::string() + IdentityCredentialStore::descriptor + "/default";
-    LOG(INFO) << "instance: " << instance;
     binder_status_t status = AServiceManager_addService(store->asBinder().get(), instance.c_str());
     CHECK(status == STATUS_OK);
 
diff --git a/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp b/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
index 56e17ba..1629a0c 100644
--- a/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
+++ b/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
@@ -182,7 +182,7 @@
                                                     false /* testCredential */));
 
     // Verify set a large number of profile count and entry count is ok
-    const vector<int32_t> entryCounts = {3000};
+    const vector<int32_t> entryCounts = {255};
     writableCredential->setExpectedProofOfProvisioningSize(123456);
     result = writableCredential->startPersonalization(25, entryCounts);
     EXPECT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()
diff --git a/keymaster/4.1/default/OWNERS b/keymaster/4.1/default/OWNERS
index 335660d..2b2ad2a 100644
--- a/keymaster/4.1/default/OWNERS
+++ b/keymaster/4.1/default/OWNERS
@@ -1,2 +1,4 @@
+jbires@google.com
 jdanis@google.com
 swillden@google.com
+zeuthen@google.com
\ No newline at end of file
diff --git a/keymaster/4.1/support/OWNERS b/keymaster/4.1/support/OWNERS
index a9efe66..2b2ad2a 100644
--- a/keymaster/4.1/support/OWNERS
+++ b/keymaster/4.1/support/OWNERS
@@ -1,3 +1,4 @@
+jbires@google.com
 jdanis@google.com
 swillden@google.com
-jbires@google.com
+zeuthen@google.com
\ No newline at end of file
diff --git a/keymaster/4.1/vts/OWNERS b/keymaster/4.1/vts/OWNERS
index 335660d..2b2ad2a 100644
--- a/keymaster/4.1/vts/OWNERS
+++ b/keymaster/4.1/vts/OWNERS
@@ -1,2 +1,4 @@
+jbires@google.com
 jdanis@google.com
 swillden@google.com
+zeuthen@google.com
\ No newline at end of file
diff --git a/neuralnetworks/1.0/utils/Android.bp b/neuralnetworks/1.0/utils/Android.bp
index 4d61fc0..d033617 100644
--- a/neuralnetworks/1.0/utils/Android.bp
+++ b/neuralnetworks/1.0/utils/Android.bp
@@ -32,3 +32,29 @@
         "neuralnetworks_utils_hal_common",
     ],
 }
+
+cc_test {
+    name: "neuralnetworks_utils_hal_1_0_test",
+    srcs: ["test/*.cpp"],
+    static_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "libgmock",
+        "libneuralnetworks_common",
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_common",
+        "neuralnetworks_utils_hal_1_0",
+    ],
+    shared_libs: [
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "libhidlmemory",
+        "liblog",
+        "libnativewindow",
+        "libutils",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Burst.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Burst.h
new file mode 100644
index 0000000..f2cbe93
--- /dev/null
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Burst.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_BURST_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_BURST_H
+
+#include <nnapi/IBurst.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <memory>
+#include <optional>
+#include <utility>
+
+// See hardware/interfaces/neuralnetworks/utils/README.md for more information on HIDL interface
+// lifetimes across processes and for protecting asynchronous calls across HIDL.
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+// Class that adapts nn::IPreparedModel to nn::IBurst.
+class Burst final : public nn::IBurst {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Burst>> create(
+            nn::SharedPreparedModel preparedModel);
+
+    Burst(PrivateConstructorTag tag, nn::SharedPreparedModel preparedModel);
+
+    OptionalCacheHold cacheMemory(const nn::Memory& memory) const override;
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure) const override;
+
+  private:
+    const nn::SharedPreparedModel kPreparedModel;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_BURST_H
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h
index db3b2ad..4681b9e 100644
--- a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h
@@ -52,6 +52,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h
index 2de1828..8853eea 100644
--- a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h
@@ -35,7 +35,8 @@
 namespace android::hardware::neuralnetworks::V1_0::utils {
 
 // Class that adapts V1_0::IPreparedModel to nn::IPreparedModel.
-class PreparedModel final : public nn::IPreparedModel {
+class PreparedModel final : public nn::IPreparedModel,
+                            public std::enable_shared_from_this<PreparedModel> {
     struct PrivateConstructorTag {};
 
   public:
@@ -56,6 +57,8 @@
             const nn::OptionalDuration& loopTimeoutDuration,
             const nn::OptionalDuration& timeoutDurationAfterFence) const override;
 
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurst() const override;
+
     std::any getUnderlyingResource() const override;
 
   private:
diff --git a/neuralnetworks/1.0/utils/src/Burst.cpp b/neuralnetworks/1.0/utils/src/Burst.cpp
new file mode 100644
index 0000000..384bd9b
--- /dev/null
+++ b/neuralnetworks/1.0/utils/src/Burst.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Burst.h"
+
+#include <android-base/logging.h>
+#include <nnapi/IBurst.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <memory>
+#include <optional>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+nn::GeneralResult<std::shared_ptr<const Burst>> Burst::create(
+        nn::SharedPreparedModel preparedModel) {
+    if (preparedModel == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+               << "V1_0::utils::Burst::create must have non-null preparedModel";
+    }
+
+    return std::make_shared<const Burst>(PrivateConstructorTag{}, std::move(preparedModel));
+}
+
+Burst::Burst(PrivateConstructorTag /*tag*/, nn::SharedPreparedModel preparedModel)
+    : kPreparedModel(std::move(preparedModel)) {
+    CHECK(kPreparedModel != nullptr);
+}
+
+Burst::OptionalCacheHold Burst::cacheMemory(const nn::Memory& /*memory*/) const {
+    return nullptr;
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> Burst::execute(
+        const nn::Request& request, nn::MeasureTiming measure) const {
+    return kPreparedModel->execute(request, measure, {}, {});
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.0/utils/src/Device.cpp b/neuralnetworks/1.0/utils/src/Device.cpp
index 93bd81a..bb31a26 100644
--- a/neuralnetworks/1.0/utils/src/Device.cpp
+++ b/neuralnetworks/1.0/utils/src/Device.cpp
@@ -106,6 +106,10 @@
     return nn::DeviceType::OTHER;
 }
 
+bool Device::isUpdatable() const {
+    return false;
+}
+
 const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
     return kExtensions;
 }
diff --git a/neuralnetworks/1.0/utils/src/PreparedModel.cpp b/neuralnetworks/1.0/utils/src/PreparedModel.cpp
index c0c22fb..858571d 100644
--- a/neuralnetworks/1.0/utils/src/PreparedModel.cpp
+++ b/neuralnetworks/1.0/utils/src/PreparedModel.cpp
@@ -16,6 +16,7 @@
 
 #include "PreparedModel.h"
 
+#include "Burst.h"
 #include "Callbacks.h"
 #include "Conversions.h"
 #include "Utils.h"
@@ -90,6 +91,10 @@
            << "IPreparedModel::executeFenced is not supported on 1.0 HAL service";
 }
 
+nn::GeneralResult<nn::SharedBurst> PreparedModel::configureExecutionBurst() const {
+    return Burst::create(shared_from_this());
+}
+
 std::any PreparedModel::getUnderlyingResource() const {
     sp<V1_0::IPreparedModel> resource = kPreparedModel;
     return resource;
diff --git a/neuralnetworks/1.0/utils/test/DeviceTest.cpp b/neuralnetworks/1.0/utils/test/DeviceTest.cpp
new file mode 100644
index 0000000..e881da2
--- /dev/null
+++ b/neuralnetworks/1.0/utils/test/DeviceTest.cpp
@@ -0,0 +1,524 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockDevice.h"
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.0/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Device.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const nn::Model kSimpleModel = {
+        .main = {.operands = {{.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_INPUT},
+                              {.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_OUTPUT}},
+                 .operations = {{.type = nn::OperationType::RELU, .inputs = {0}, .outputs = {1}}},
+                 .inputIndexes = {0},
+                 .outputIndexes = {1}}};
+
+const std::string kName = "Google-MockV1";
+const std::string kInvalidName = "";
+const sp<V1_0::IDevice> kInvalidDevice;
+constexpr V1_0::PerformanceInfo kNoPerformanceInfo = {
+        .execTime = std::numeric_limits<float>::max(),
+        .powerUsage = std::numeric_limits<float>::max()};
+
+template <typename... Args>
+auto makeCallbackReturn(Args&&... args) {
+    return [argPack = std::make_tuple(std::forward<Args>(args)...)](const auto& cb) {
+        std::apply(cb, argPack);
+        return Void();
+    };
+}
+
+sp<MockDevice> createMockDevice() {
+    const auto mockDevice = MockDevice::create();
+
+    // Setup default actions for each relevant call.
+    const auto getCapabilities_ret = makeCallbackReturn(
+            V1_0::ErrorStatus::NONE, V1_0::Capabilities{
+                                             .float32Performance = kNoPerformanceInfo,
+                                             .quantized8Performance = kNoPerformanceInfo,
+                                     });
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, getCapabilities(_)).WillByDefault(Invoke(getCapabilities_ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, getCapabilities(_)).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+auto makePreparedModelReturn(V1_0::ErrorStatus launchStatus, V1_0::ErrorStatus returnStatus,
+                             const sp<V1_0::utils::MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](const V1_0::Model& /*model*/,
+                                                       const sp<V1_0::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_0::ErrorStatus> {
+        cb->notify(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(DeviceTest, invalidName) {
+    // run test
+    const auto device = MockDevice::create();
+    const auto result = Device::create(kInvalidName, device);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, invalidDevice) {
+    // run test
+    const auto result = Device::create(kName, kInvalidDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, getCapabilitiesError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                        V1_0::Capabilities{
+                                                .float32Performance = kNoPerformanceInfo,
+                                                .quantized8Performance = kNoPerformanceInfo,
+                                        });
+    EXPECT_CALL(*mockDevice, getCapabilities(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, linkToDeathError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getName) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto& name = device->getName();
+
+    // verify result
+    EXPECT_EQ(name, kName);
+}
+
+TEST(DeviceTest, getFeatureLevel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto featureLevel = device->getFeatureLevel();
+
+    // verify result
+    EXPECT_EQ(featureLevel, nn::Version::ANDROID_OC_MR1);
+}
+
+TEST(DeviceTest, getCachedData) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto result = Device::create(kName, mockDevice);
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& device = result.value();
+
+    // run test and verify results
+    EXPECT_EQ(device->getVersionString(), device->getVersionString());
+    EXPECT_EQ(device->getType(), device->getType());
+    EXPECT_EQ(device->getSupportedExtensions(), device->getSupportedExtensions());
+    EXPECT_EQ(device->getNumberOfCacheFilesNeeded(), device->getNumberOfCacheFilesNeeded());
+    EXPECT_EQ(device->getCapabilities(), device->getCapabilities());
+}
+
+TEST(DeviceTest, wait) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<void> { return {}; };
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(DeviceTest, waitTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, waitDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedOperations) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& model, const auto& cb) {
+        cb(V1_0::ErrorStatus::NONE, std::vector<bool>(model.operations.size(), true));
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& supportedOperations = result.value();
+    EXPECT_EQ(supportedOperations.size(), kSimpleModel.main.operations.size());
+    EXPECT_THAT(supportedOperations, Each(testing::IsTrue()));
+}
+
+TEST(DeviceTest, getSupportedOperationsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& /*model*/, const auto& cb) {
+        cb(V1_0::ErrorStatus::GENERAL_FAILURE, {});
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = V1_0::utils::MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelLaunchError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelReturnError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModel(_, _)).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCacheNotSupported) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, allocateNotSupported) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.0/utils/test/MockDevice.h b/neuralnetworks/1.0/utils/test/MockDevice.h
new file mode 100644
index 0000000..0fb59e3
--- /dev/null
+++ b/neuralnetworks/1.0/utils/test/MockDevice.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_DEVICE
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_DEVICE
+
+#include <android/hardware/neuralnetworks/1.0/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class MockDevice final : public IDevice {
+  public:
+    static sp<MockDevice> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient, uint64_t /*cookie*/);
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities, (getCapabilities_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations,
+                (const V1_0::Model& model, getSupportedOperations_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel,
+                (const V1_0::Model& model, const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::DeviceStatus>, getStatus, (), (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockDevice> MockDevice::create() {
+    auto mockDevice = sp<MockDevice>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+inline Return<bool> MockDevice::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                            uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockDevice::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::Device will not use the `cookie` or `who` arguments, so we pass in 0
+    // and nullptr for these arguments instead. Normally, they are used by the hidl_death_recipient
+    // to determine which object is dead. However, the utils::Device code only pairs a single death
+    // recipient with a single HIDL interface object, so these arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_DEVICE
diff --git a/neuralnetworks/1.0/utils/test/MockPreparedModel.h b/neuralnetworks/1.0/utils/test/MockPreparedModel.h
new file mode 100644
index 0000000..7a48a83
--- /dev/null
+++ b/neuralnetworks/1.0/utils/test/MockPreparedModel.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_PREPARED_MODEL
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_PREPARED_MODEL
+
+#include <android/hardware/neuralnetworks/1.0/IPreparedModel.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/HidlSupport.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class MockPreparedModel final : public IPreparedModel {
+  public:
+    static sp<MockPreparedModel> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient,
+                             uint64_t /*cookie*/) override;
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute,
+                (const V1_0::Request& request, const sp<V1_0::IExecutionCallback>& callback),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockPreparedModel> MockPreparedModel::create() {
+    auto mockPreparedModel = sp<MockPreparedModel>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockPreparedModel, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockPreparedModel;
+}
+
+inline Return<bool> MockPreparedModel::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                                   uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockPreparedModel::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::PreparedModel will not use the `cookie` or `who` arguments, so we pass
+    // in 0 and nullptr for these arguments instead. Normally, they are used by the
+    // hidl_death_recipient to determine which object is dead. However, the utils::PreparedModel
+    // code only pairs a single death recipient with a single HIDL interface object, so these
+    // arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_TEST_MOCK_PREPARED_MODEL
diff --git a/neuralnetworks/1.0/utils/test/PreparedModelTest.cpp b/neuralnetworks/1.0/utils/test/PreparedModelTest.cpp
new file mode 100644
index 0000000..a5cbc72
--- /dev/null
+++ b/neuralnetworks/1.0/utils/test/PreparedModelTest.cpp
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.0/IExecutionCallback.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/PreparedModel.h>
+
+#include <functional>
+#include <memory>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const sp<V1_0::IPreparedModel> kInvalidPreparedModel;
+
+sp<MockPreparedModel> createMockPreparedModel() {
+    return MockPreparedModel::create();
+}
+
+auto makeExecute(V1_0::ErrorStatus launchStatus, V1_0::ErrorStatus returnStatus) {
+    return [launchStatus, returnStatus](
+                   const V1_0::Request& /*request*/,
+                   const sp<V1_0::IExecutionCallback>& cb) -> Return<V1_0::ErrorStatus> {
+        cb->notify(returnStatus);
+        return launchStatus;
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(PreparedModelTest, invalidPreparedModel) {
+    // run test
+    const auto result = PreparedModel::create(kInvalidPreparedModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathError) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, execute) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecute(V1_0::ErrorStatus::NONE, V1_0::ErrorStatus::NONE)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(PreparedModelTest, executeLaunchError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecute(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                         V1_0::ErrorStatus::GENERAL_FAILURE)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeReturnError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _))
+            .Times(1)
+            .WillOnce(Invoke(
+                    makeExecute(V1_0::ErrorStatus::NONE, V1_0::ErrorStatus::GENERAL_FAILURE)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeCrash) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+    const auto ret = [&mockPreparedModel]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockPreparedModel->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockPreparedModel, execute(_, _)).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeFencedNotSupported) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+// TODO: test burst execution if/when it is added to nn::IPreparedModel.
+
+TEST(PreparedModelTest, getUnderlyingResource) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel = PreparedModel::create(mockPreparedModel).value();
+
+    // run test
+    const auto resource = preparedModel->getUnderlyingResource();
+
+    // verify resource
+    const sp<V1_0::IPreparedModel>* maybeMock = std::any_cast<sp<V1_0::IPreparedModel>>(&resource);
+    ASSERT_NE(maybeMock, nullptr);
+    EXPECT_EQ(maybeMock->get(), mockPreparedModel.get());
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.1/utils/Android.bp b/neuralnetworks/1.1/utils/Android.bp
index 909575b..fe0c80a 100644
--- a/neuralnetworks/1.1/utils/Android.bp
+++ b/neuralnetworks/1.1/utils/Android.bp
@@ -34,3 +34,31 @@
         "neuralnetworks_utils_hal_common",
     ],
 }
+
+cc_test {
+    name: "neuralnetworks_utils_hal_1_1_test",
+    srcs: ["test/*.cpp"],
+    static_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "android.hardware.neuralnetworks@1.1",
+        "libgmock",
+        "libneuralnetworks_common",
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_common",
+        "neuralnetworks_utils_hal_1_0",
+        "neuralnetworks_utils_hal_1_1",
+    ],
+    shared_libs: [
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "libhidlmemory",
+        "liblog",
+        "libnativewindow",
+        "libutils",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h
index 5e224b5..3aec8ee 100644
--- a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h
+++ b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h
@@ -52,6 +52,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
diff --git a/neuralnetworks/1.1/utils/src/Device.cpp b/neuralnetworks/1.1/utils/src/Device.cpp
index 3197ef4..d2ef57f 100644
--- a/neuralnetworks/1.1/utils/src/Device.cpp
+++ b/neuralnetworks/1.1/utils/src/Device.cpp
@@ -106,6 +106,10 @@
     return nn::DeviceType::UNKNOWN;
 }
 
+bool Device::isUpdatable() const {
+    return false;
+}
+
 const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
     return kExtensions;
 }
diff --git a/neuralnetworks/1.1/utils/test/DeviceTest.cpp b/neuralnetworks/1.1/utils/test/DeviceTest.cpp
new file mode 100644
index 0000000..41e0e30
--- /dev/null
+++ b/neuralnetworks/1.1/utils/test/DeviceTest.cpp
@@ -0,0 +1,534 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockDevice.h"
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.1/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.1/Device.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const nn::Model kSimpleModel = {
+        .main = {.operands = {{.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_INPUT},
+                              {.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_OUTPUT}},
+                 .operations = {{.type = nn::OperationType::RELU, .inputs = {0}, .outputs = {1}}},
+                 .inputIndexes = {0},
+                 .outputIndexes = {1}}};
+
+const std::string kName = "Google-MockV1";
+const std::string kInvalidName = "";
+const sp<V1_1::IDevice> kInvalidDevice;
+constexpr V1_0::PerformanceInfo kNoPerformanceInfo = {
+        .execTime = std::numeric_limits<float>::max(),
+        .powerUsage = std::numeric_limits<float>::max()};
+
+template <typename... Args>
+auto makeCallbackReturn(Args&&... args) {
+    return [argPack = std::make_tuple(std::forward<Args>(args)...)](const auto& cb) {
+        std::apply(cb, argPack);
+        return Void();
+    };
+}
+
+sp<MockDevice> createMockDevice() {
+    const auto mockDevice = MockDevice::create();
+
+    // Setup default actions for each relevant call.
+    const auto getCapabilities_ret =
+            makeCallbackReturn(V1_0::ErrorStatus::NONE,
+                               V1_1::Capabilities{
+                                       .float32Performance = kNoPerformanceInfo,
+                                       .quantized8Performance = kNoPerformanceInfo,
+                                       .relaxedFloat32toFloat16Performance = kNoPerformanceInfo,
+                               });
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, getCapabilities_1_1(_)).WillByDefault(Invoke(getCapabilities_ret));
+
+    // Ensure that older calls are not used.
+    EXPECT_CALL(*mockDevice, getCapabilities(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel(_, _)).Times(0);
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_)).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+auto makePreparedModelReturn(V1_0::ErrorStatus launchStatus, V1_0::ErrorStatus returnStatus,
+                             const sp<V1_0::utils::MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](const V1_1::Model& /*model*/,
+                                                       V1_1::ExecutionPreference /*preference*/,
+                                                       const sp<V1_0::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_0::ErrorStatus> {
+        cb->notify(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(DeviceTest, invalidName) {
+    // run test
+    const auto device = MockDevice::create();
+    const auto result = Device::create(kInvalidName, device);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, invalidDevice) {
+    // run test
+    const auto result = Device::create(kName, kInvalidDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, getCapabilitiesError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret =
+            makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                               V1_1::Capabilities{
+                                       .float32Performance = kNoPerformanceInfo,
+                                       .quantized8Performance = kNoPerformanceInfo,
+                                       .relaxedFloat32toFloat16Performance = kNoPerformanceInfo,
+                               });
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, linkToDeathError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getName) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto& name = device->getName();
+
+    // verify result
+    EXPECT_EQ(name, kName);
+}
+
+TEST(DeviceTest, getFeatureLevel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto featureLevel = device->getFeatureLevel();
+
+    // verify result
+    EXPECT_EQ(featureLevel, nn::Version::ANDROID_P);
+}
+
+TEST(DeviceTest, getCachedData) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto result = Device::create(kName, mockDevice);
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& device = result.value();
+
+    // run test and verify results
+    EXPECT_EQ(device->getVersionString(), device->getVersionString());
+    EXPECT_EQ(device->getType(), device->getType());
+    EXPECT_EQ(device->getSupportedExtensions(), device->getSupportedExtensions());
+    EXPECT_EQ(device->getNumberOfCacheFilesNeeded(), device->getNumberOfCacheFilesNeeded());
+    EXPECT_EQ(device->getCapabilities(), device->getCapabilities());
+}
+
+TEST(DeviceTest, wait) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<void> { return {}; };
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(DeviceTest, waitTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, waitDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedOperations) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& model, const auto& cb) {
+        cb(V1_0::ErrorStatus::NONE, std::vector<bool>(model.operations.size(), true));
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& supportedOperations = result.value();
+    EXPECT_EQ(supportedOperations.size(), kSimpleModel.main.operations.size());
+    EXPECT_THAT(supportedOperations, Each(testing::IsTrue()));
+}
+
+TEST(DeviceTest, getSupportedOperationsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& /*model*/, const auto& cb) {
+        cb(V1_0::ErrorStatus::GENERAL_FAILURE, {});
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = V1_0::utils::MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelLaunchError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelReturnError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _)).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCacheNotSupported) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, allocateNotSupported) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
diff --git a/neuralnetworks/1.1/utils/test/MockDevice.h b/neuralnetworks/1.1/utils/test/MockDevice.h
new file mode 100644
index 0000000..3b92e58
--- /dev/null
+++ b/neuralnetworks/1.1/utils/test/MockDevice.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_DEVICE
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_DEVICE
+
+#include <android/hardware/neuralnetworks/1.1/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+
+class MockDevice final : public IDevice {
+  public:
+    static sp<MockDevice> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient, uint64_t /*cookie*/);
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities, (getCapabilities_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations,
+                (const V1_0::Model& model, getSupportedOperations_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel,
+                (const V1_0::Model& model, const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::DeviceStatus>, getStatus, (), (override));
+
+    // V1_1 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities_1_1, (getCapabilities_1_1_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_1,
+                (const V1_1::Model& model, getSupportedOperations_1_1_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel_1_1,
+                (const V1_1::Model& model, V1_1::ExecutionPreference preference,
+                 const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockDevice> MockDevice::create() {
+    auto mockDevice = sp<MockDevice>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+inline Return<bool> MockDevice::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                            uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockDevice::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::Device will not use the `cookie` or `who` arguments, so we pass in 0
+    // and nullptr for these arguments instead. Normally, they are used by the hidl_death_recipient
+    // to determine which object is dead. However, the utils::Device code only pairs a single death
+    // recipient with a single HIDL interface object, so these arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_DEVICE
diff --git a/neuralnetworks/1.1/utils/test/MockPreparedModel.h b/neuralnetworks/1.1/utils/test/MockPreparedModel.h
new file mode 100644
index 0000000..aba731e
--- /dev/null
+++ b/neuralnetworks/1.1/utils/test/MockPreparedModel.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_PREPARED_MODEL
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_PREPARED_MODEL
+
+#include <android/hardware/neuralnetworks/1.0/IPreparedModel.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/HidlSupport.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class MockPreparedModel final : public IPreparedModel {
+  public:
+    static sp<MockPreparedModel> create();
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute,
+                (const V1_0::Request& request, const sp<V1_0::IExecutionCallback>& callback),
+                (override));
+};
+
+inline sp<MockPreparedModel> MockPreparedModel::create() {
+    return sp<MockPreparedModel>::make();
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_TEST_MOCK_PREPARED_MODEL
diff --git a/neuralnetworks/1.2/utils/Android.bp b/neuralnetworks/1.2/utils/Android.bp
index 22e8659..6959056 100644
--- a/neuralnetworks/1.2/utils/Android.bp
+++ b/neuralnetworks/1.2/utils/Android.bp
@@ -18,6 +18,7 @@
     name: "neuralnetworks_utils_hal_1_2",
     defaults: ["neuralnetworks_utils_defaults"],
     srcs: ["src/*"],
+    exclude_srcs: ["src/ExecutionBurst*"],
     local_include_dirs: ["include/nnapi/hal/1.2/"],
     export_include_dirs: ["include"],
     cflags: ["-Wthread-safety"],
@@ -36,3 +37,33 @@
         "neuralnetworks_utils_hal_common",
     ],
 }
+
+cc_test {
+    name: "neuralnetworks_utils_hal_1_2_test",
+    srcs: ["test/*.cpp"],
+    static_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "android.hardware.neuralnetworks@1.1",
+        "android.hardware.neuralnetworks@1.2",
+        "libgmock",
+        "libneuralnetworks_common",
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_common",
+        "neuralnetworks_utils_hal_1_0",
+        "neuralnetworks_utils_hal_1_1",
+        "neuralnetworks_utils_hal_1_2",
+    ],
+    shared_libs: [
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "libhidlmemory",
+        "liblog",
+        "libnativewindow",
+        "libutils",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h
index b4bef5e..489f857 100644
--- a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h
@@ -71,6 +71,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstController.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstController.h
new file mode 100644
index 0000000..5356a91
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstController.h
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_CONTROLLER_H
+#define ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_CONTROLLER_H
+
+#include "ExecutionBurstUtils.h"
+
+#include <android-base/macros.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/IBurstCallback.h>
+#include <android/hardware/neuralnetworks/1.2/IBurstContext.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+
+#include <atomic>
+#include <chrono>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <stack>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::nn {
+
+/**
+ * The ExecutionBurstController class manages both the serialization and
+ * deserialization of data across FMQ, making it appear to the runtime as a
+ * regular synchronous inference. Additionally, this class manages the burst's
+ * memory cache.
+ */
+class ExecutionBurstController {
+    DISALLOW_IMPLICIT_CONSTRUCTORS(ExecutionBurstController);
+
+  public:
+    /**
+     * NN runtime burst callback object and memory cache.
+     *
+     * ExecutionBurstCallback associates a hidl_memory object with a slot number
+     * to be passed across FMQ. The ExecutionBurstServer can use this callback
+     * to retrieve this hidl_memory corresponding to the slot via HIDL.
+     *
+     * Whenever a hidl_memory object is copied, it will duplicate the underlying
+     * file descriptor. Because the NN runtime currently copies the hidl_memory
+     * on each execution, it is difficult to associate hidl_memory objects with
+     * previously cached hidl_memory objects. For this reason, callers of this
+     * class must pair each hidl_memory object with an associated key. For
+     * efficiency, if two hidl_memory objects represent the same underlying
+     * buffer, they must use the same key.
+     */
+    class ExecutionBurstCallback : public hardware::neuralnetworks::V1_2::IBurstCallback {
+        DISALLOW_COPY_AND_ASSIGN(ExecutionBurstCallback);
+
+      public:
+        ExecutionBurstCallback() = default;
+
+        hardware::Return<void> getMemories(const hardware::hidl_vec<int32_t>& slots,
+                                           getMemories_cb cb) override;
+
+        /**
+         * This function performs one of two different actions:
+         * 1) If a key corresponding to a memory resource is unrecognized by the
+         *    ExecutionBurstCallback object, the ExecutionBurstCallback object
+         *    will allocate a slot, bind the memory to the slot, and return the
+         *    slot identifier.
+         * 2) If a key corresponding to a memory resource is recognized by the
+         *    ExecutionBurstCallback object, the ExecutionBurstCallback object
+         *    will return the existing slot identifier.
+         *
+         * @param memories Memory resources used in an inference.
+         * @param keys Unique identifiers where each element corresponds to a
+         *     memory resource element in "memories".
+         * @return Unique slot identifiers where each returned slot element
+         *     corresponds to a memory resource element in "memories".
+         */
+        std::vector<int32_t> getSlots(const hardware::hidl_vec<hardware::hidl_memory>& memories,
+                                      const std::vector<intptr_t>& keys);
+
+        /*
+         * This function performs two different actions:
+         * 1) Removes an entry from the cache (if present), including the local
+         *    storage of the hidl_memory object. Note that this call does not
+         *    free any corresponding hidl_memory object in ExecutionBurstServer,
+         *    which is separately freed via IBurstContext::freeMemory.
+         * 2) Return whether a cache entry was removed and which slot was removed if
+         *    found. If the key did not to correspond to any entry in the cache, a
+         *    slot number of 0 is returned. The slot number and whether the entry
+         *    existed is useful so the same slot can be freed in the
+         *    ExecutionBurstServer's cache via IBurstContext::freeMemory.
+         */
+        std::pair<bool, int32_t> freeMemory(intptr_t key);
+
+      private:
+        int32_t getSlotLocked(const hardware::hidl_memory& memory, intptr_t key);
+        int32_t allocateSlotLocked();
+
+        std::mutex mMutex;
+        std::stack<int32_t, std::vector<int32_t>> mFreeSlots;
+        std::map<intptr_t, int32_t> mMemoryIdToSlot;
+        std::vector<hardware::hidl_memory> mMemoryCache;
+    };
+
+    /**
+     * Creates a burst controller on a prepared model.
+     *
+     * Prefer this over ExecutionBurstController's constructor.
+     *
+     * @param preparedModel Model prepared for execution to execute on.
+     * @param pollingTimeWindow How much time (in microseconds) the
+     *     ExecutionBurstController is allowed to poll the FMQ before waiting on
+     *     the blocking futex. Polling may result in lower latencies at the
+     *     potential cost of more power usage.
+     * @return ExecutionBurstController Execution burst controller object.
+     */
+    static std::unique_ptr<ExecutionBurstController> create(
+            const sp<hardware::neuralnetworks::V1_2::IPreparedModel>& preparedModel,
+            std::chrono::microseconds pollingTimeWindow);
+
+    // prefer calling ExecutionBurstController::create
+    ExecutionBurstController(const std::shared_ptr<RequestChannelSender>& requestChannelSender,
+                             const std::shared_ptr<ResultChannelReceiver>& resultChannelReceiver,
+                             const sp<hardware::neuralnetworks::V1_2::IBurstContext>& burstContext,
+                             const sp<ExecutionBurstCallback>& callback,
+                             const sp<hardware::hidl_death_recipient>& deathHandler = nullptr);
+
+    // explicit destructor to unregister the death recipient
+    ~ExecutionBurstController();
+
+    /**
+     * Execute a request on a model.
+     *
+     * @param request Arguments to be executed on a model.
+     * @param measure Whether to collect timing measurements, either YES or NO
+     * @param memoryIds Identifiers corresponding to each memory object in the
+     *     request's pools.
+     * @return A tuple of:
+     *     - result code of the execution
+     *     - dynamic output shapes from the execution
+     *     - any execution time measurements of the execution
+     *     - whether or not a failed burst execution should be re-run using a
+     *       different path (e.g., IPreparedModel::executeSynchronously)
+     */
+    std::tuple<int, std::vector<hardware::neuralnetworks::V1_2::OutputShape>,
+               hardware::neuralnetworks::V1_2::Timing, bool>
+    compute(const hardware::neuralnetworks::V1_0::Request& request,
+            hardware::neuralnetworks::V1_2::MeasureTiming measure,
+            const std::vector<intptr_t>& memoryIds);
+
+    /**
+     * Propagate a user's freeing of memory to the service.
+     *
+     * @param key Key corresponding to the memory object.
+     */
+    void freeMemory(intptr_t key);
+
+  private:
+    std::mutex mMutex;
+    const std::shared_ptr<RequestChannelSender> mRequestChannelSender;
+    const std::shared_ptr<ResultChannelReceiver> mResultChannelReceiver;
+    const sp<hardware::neuralnetworks::V1_2::IBurstContext> mBurstContext;
+    const sp<ExecutionBurstCallback> mMemoryCache;
+    const sp<hardware::hidl_death_recipient> mDeathHandler;
+};
+
+}  // namespace android::nn
+
+#endif  // ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_CONTROLLER_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstServer.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstServer.h
new file mode 100644
index 0000000..2e109b2
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstServer.h
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_SERVER_H
+#define ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_SERVER_H
+
+#include "ExecutionBurstUtils.h"
+
+#include <android-base/macros.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/IBurstCallback.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+
+#include <atomic>
+#include <chrono>
+#include <memory>
+#include <optional>
+#include <thread>
+#include <tuple>
+#include <vector>
+
+namespace android::nn {
+
+/**
+ * The ExecutionBurstServer class is responsible for waiting for and
+ * deserializing a request object from a FMQ, performing the inference, and
+ * serializing the result back across another FMQ.
+ */
+class ExecutionBurstServer : public hardware::neuralnetworks::V1_2::IBurstContext {
+    DISALLOW_IMPLICIT_CONSTRUCTORS(ExecutionBurstServer);
+
+  public:
+    /**
+     * IBurstExecutorWithCache is a callback object passed to
+     * ExecutionBurstServer's factory function that is used to perform an
+     * execution. Because some memory resources are needed across multiple
+     * executions, this object also contains a local cache that can directly be
+     * used in the execution.
+     *
+     * ExecutionBurstServer will never access its IBurstExecutorWithCache object
+     * with concurrent calls.
+     */
+    class IBurstExecutorWithCache {
+        DISALLOW_COPY_AND_ASSIGN(IBurstExecutorWithCache);
+
+      public:
+        IBurstExecutorWithCache() = default;
+        virtual ~IBurstExecutorWithCache() = default;
+
+        /**
+         * Checks if a cache entry specified by a slot is present in the cache.
+         *
+         * @param slot Identifier of the cache entry.
+         * @return 'true' if the cache entry is present in the cache, 'false'
+         *     otherwise.
+         */
+        virtual bool isCacheEntryPresent(int32_t slot) const = 0;
+
+        /**
+         * Adds an entry specified by a slot to the cache.
+         *
+         * The caller of this function must ensure that the cache entry that is
+         * being added is not already present in the cache. This can be checked
+         * via isCacheEntryPresent.
+         *
+         * @param memory Memory resource to be cached.
+         * @param slot Slot identifier corresponding to the memory resource.
+         */
+        virtual void addCacheEntry(const hardware::hidl_memory& memory, int32_t slot) = 0;
+
+        /**
+         * Removes an entry specified by a slot from the cache.
+         *
+         * If the cache entry corresponding to the slot number does not exist,
+         * the call does nothing.
+         *
+         * @param slot Slot identifier corresponding to the memory resource.
+         */
+        virtual void removeCacheEntry(int32_t slot) = 0;
+
+        /**
+         * Perform an execution.
+         *
+         * @param request Request object with inputs and outputs specified.
+         *     Request::pools is empty, and DataLocation::poolIndex instead
+         *     refers to the 'slots' argument as if it were Request::pools.
+         * @param slots Slots corresponding to the cached memory entries to be
+         *     used.
+         * @param measure Whether timing information is requested for the
+         *     execution.
+         * @return Result of the execution, including the status of the
+         *     execution, dynamic output shapes, and any timing information.
+         */
+        virtual std::tuple<hardware::neuralnetworks::V1_0::ErrorStatus,
+                           hardware::hidl_vec<hardware::neuralnetworks::V1_2::OutputShape>,
+                           hardware::neuralnetworks::V1_2::Timing>
+        execute(const hardware::neuralnetworks::V1_0::Request& request,
+                const std::vector<int32_t>& slots,
+                hardware::neuralnetworks::V1_2::MeasureTiming measure) = 0;
+    };
+
+    /**
+     * Create automated context to manage FMQ-based executions.
+     *
+     * This function is intended to be used by a service to automatically:
+     * 1) Receive data from a provided FMQ
+     * 2) Execute a model with the given information
+     * 3) Send the result to the created FMQ
+     *
+     * @param callback Callback used to retrieve memories corresponding to
+     *     unrecognized slots.
+     * @param requestChannel Input FMQ channel through which the client passes the
+     *     request to the service.
+     * @param resultChannel Output FMQ channel from which the client can retrieve
+     *     the result of the execution.
+     * @param executorWithCache Object which maintains a local cache of the
+     *     memory pools and executes using the cached memory pools.
+     * @param pollingTimeWindow How much time (in microseconds) the
+     *     ExecutionBurstServer is allowed to poll the FMQ before waiting on
+     *     the blocking futex. Polling may result in lower latencies at the
+     *     potential cost of more power usage.
+     * @result IBurstContext Handle to the burst context.
+     */
+    static sp<ExecutionBurstServer> create(
+            const sp<hardware::neuralnetworks::V1_2::IBurstCallback>& callback,
+            const FmqRequestDescriptor& requestChannel, const FmqResultDescriptor& resultChannel,
+            std::shared_ptr<IBurstExecutorWithCache> executorWithCache,
+            std::chrono::microseconds pollingTimeWindow = std::chrono::microseconds{0});
+
+    /**
+     * Create automated context to manage FMQ-based executions.
+     *
+     * This function is intended to be used by a service to automatically:
+     * 1) Receive data from a provided FMQ
+     * 2) Execute a model with the given information
+     * 3) Send the result to the created FMQ
+     *
+     * @param callback Callback used to retrieve memories corresponding to
+     *     unrecognized slots.
+     * @param requestChannel Input FMQ channel through which the client passes the
+     *     request to the service.
+     * @param resultChannel Output FMQ channel from which the client can retrieve
+     *     the result of the execution.
+     * @param preparedModel PreparedModel that the burst object was created from.
+     *     IPreparedModel::executeSynchronously will be used to perform the
+     *     execution.
+     * @param pollingTimeWindow How much time (in microseconds) the
+     *     ExecutionBurstServer is allowed to poll the FMQ before waiting on
+     *     the blocking futex. Polling may result in lower latencies at the
+     *     potential cost of more power usage.
+     * @result IBurstContext Handle to the burst context.
+     */
+    static sp<ExecutionBurstServer> create(
+            const sp<hardware::neuralnetworks::V1_2::IBurstCallback>& callback,
+            const FmqRequestDescriptor& requestChannel, const FmqResultDescriptor& resultChannel,
+            hardware::neuralnetworks::V1_2::IPreparedModel* preparedModel,
+            std::chrono::microseconds pollingTimeWindow = std::chrono::microseconds{0});
+
+    ExecutionBurstServer(const sp<hardware::neuralnetworks::V1_2::IBurstCallback>& callback,
+                         std::unique_ptr<RequestChannelReceiver> requestChannel,
+                         std::unique_ptr<ResultChannelSender> resultChannel,
+                         std::shared_ptr<IBurstExecutorWithCache> cachedExecutor);
+    ~ExecutionBurstServer();
+
+    // Used by the NN runtime to preemptively remove any stored memory.
+    hardware::Return<void> freeMemory(int32_t slot) override;
+
+  private:
+    // Ensures all cache entries contained in mExecutorWithCache are present in
+    // the cache. If they are not present, they are retrieved (via
+    // IBurstCallback::getMemories) and added to mExecutorWithCache.
+    //
+    // This method is locked via mMutex when it is called.
+    void ensureCacheEntriesArePresentLocked(const std::vector<int32_t>& slots);
+
+    // Work loop that will continue processing execution requests until the
+    // ExecutionBurstServer object is freed.
+    void task();
+
+    std::thread mWorker;
+    std::mutex mMutex;
+    std::atomic<bool> mTeardown{false};
+    const sp<hardware::neuralnetworks::V1_2::IBurstCallback> mCallback;
+    const std::unique_ptr<RequestChannelReceiver> mRequestChannelReceiver;
+    const std::unique_ptr<ResultChannelSender> mResultChannelSender;
+    const std::shared_ptr<IBurstExecutorWithCache> mExecutorWithCache;
+};
+
+}  // namespace android::nn
+
+#endif  // ANDROID_FRAMEWORKS_ML_NN_COMMON_EXECUTION_BURST_SERVER_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstUtils.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstUtils.h
new file mode 100644
index 0000000..8a41591
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/ExecutionBurstUtils.h
@@ -0,0 +1,335 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_EXECUTION_BURST_UTILS_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_EXECUTION_BURST_UTILS_H
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+
+#include <atomic>
+#include <chrono>
+#include <memory>
+#include <optional>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+/**
+ * Number of elements in the FMQ.
+ */
+constexpr const size_t kExecutionBurstChannelLength = 1024;
+
+using FmqRequestDescriptor = MQDescriptorSync<FmqRequestDatum>;
+using FmqResultDescriptor = MQDescriptorSync<FmqResultDatum>;
+
+/**
+ * Function to serialize a request.
+ *
+ * Prefer calling RequestChannelSender::send.
+ *
+ * @param request Request object without the pool information.
+ * @param measure Whether to collect timing information for the execution.
+ * @param memoryIds Slot identifiers corresponding to memory resources for the
+ *     request.
+ * @return Serialized FMQ request data.
+ */
+std::vector<hardware::neuralnetworks::V1_2::FmqRequestDatum> serialize(
+        const hardware::neuralnetworks::V1_0::Request& request,
+        hardware::neuralnetworks::V1_2::MeasureTiming measure, const std::vector<int32_t>& slots);
+
+/**
+ * Deserialize the FMQ request data.
+ *
+ * The three resulting fields are the Request object (where Request::pools is
+ * empty), slot identifiers (which are stand-ins for Request::pools), and
+ * whether timing information must be collected for the run.
+ *
+ * @param data Serialized FMQ request data.
+ * @return Request object if successfully deserialized, std::nullopt otherwise.
+ */
+std::optional<std::tuple<hardware::neuralnetworks::V1_0::Request, std::vector<int32_t>,
+                         hardware::neuralnetworks::V1_2::MeasureTiming>>
+deserialize(const std::vector<hardware::neuralnetworks::V1_2::FmqRequestDatum>& data);
+
+/**
+ * Function to serialize results.
+ *
+ * Prefer calling ResultChannelSender::send.
+ *
+ * @param errorStatus Status of the execution.
+ * @param outputShapes Dynamic shapes of the output tensors.
+ * @param timing Timing information of the execution.
+ * @return Serialized FMQ result data.
+ */
+std::vector<hardware::neuralnetworks::V1_2::FmqResultDatum> serialize(
+        hardware::neuralnetworks::V1_0::ErrorStatus errorStatus,
+        const std::vector<hardware::neuralnetworks::V1_2::OutputShape>& outputShapes,
+        hardware::neuralnetworks::V1_2::Timing timing);
+
+/**
+ * Deserialize the FMQ result data.
+ *
+ * The three resulting fields are the status of the execution, the dynamic
+ * shapes of the output tensors, and the timing information of the execution.
+ *
+ * @param data Serialized FMQ result data.
+ * @return Result object if successfully deserialized, std::nullopt otherwise.
+ */
+std::optional<std::tuple<hardware::neuralnetworks::V1_0::ErrorStatus,
+                         std::vector<hardware::neuralnetworks::V1_2::OutputShape>,
+                         hardware::neuralnetworks::V1_2::Timing>>
+deserialize(const std::vector<hardware::neuralnetworks::V1_2::FmqResultDatum>& data);
+
+/**
+ * Convert result code to error status.
+ *
+ * @param resultCode Result code to be converted.
+ * @return ErrorStatus Resultant error status.
+ */
+hardware::neuralnetworks::V1_0::ErrorStatus legacyConvertResultCodeToErrorStatus(int resultCode);
+
+/**
+ * RequestChannelSender is responsible for serializing the result packet of
+ * information, sending it on the result channel, and signaling that the data is
+ * available.
+ */
+class RequestChannelSender {
+    using FmqRequestDescriptor =
+            hardware::MQDescriptorSync<hardware::neuralnetworks::V1_2::FmqRequestDatum>;
+    using FmqRequestChannel =
+            hardware::MessageQueue<hardware::neuralnetworks::V1_2::FmqRequestDatum,
+                                   hardware::kSynchronizedReadWrite>;
+
+  public:
+    /**
+     * Create the sending end of a request channel.
+     *
+     * Prefer this call over the constructor.
+     *
+     * @param channelLength Number of elements in the FMQ.
+     * @return A pair of ResultChannelReceiver and the FMQ descriptor on
+     *     successful creation, both nullptr otherwise.
+     */
+    static std::pair<std::unique_ptr<RequestChannelSender>, const FmqRequestDescriptor*> create(
+            size_t channelLength);
+
+    /**
+     * Send the request to the channel.
+     *
+     * @param request Request object without the pool information.
+     * @param measure Whether to collect timing information for the execution.
+     * @param memoryIds Slot identifiers corresponding to memory resources for
+     *     the request.
+     * @return 'true' on successful send, 'false' otherwise.
+     */
+    bool send(const hardware::neuralnetworks::V1_0::Request& request,
+              hardware::neuralnetworks::V1_2::MeasureTiming measure,
+              const std::vector<int32_t>& slots);
+
+    /**
+     * Method to mark the channel as invalid, causing all future calls to
+     * RequestChannelSender::send to immediately return false without attempting
+     * to send a message across the FMQ.
+     */
+    void invalidate();
+
+    // prefer calling RequestChannelSender::send
+    bool sendPacket(const std::vector<hardware::neuralnetworks::V1_2::FmqRequestDatum>& packet);
+
+    RequestChannelSender(std::unique_ptr<FmqRequestChannel> fmqRequestChannel);
+
+  private:
+    const std::unique_ptr<FmqRequestChannel> mFmqRequestChannel;
+    std::atomic<bool> mValid{true};
+};
+
+/**
+ * RequestChannelReceiver is responsible for waiting on the channel until the
+ * packet is available, extracting the packet from the channel, and
+ * deserializing the packet.
+ *
+ * Because the receiver can wait on a packet that may never come (e.g., because
+ * the sending side of the packet has been closed), this object can be
+ * invalidated, unblocking the receiver.
+ */
+class RequestChannelReceiver {
+    using FmqRequestChannel =
+            hardware::MessageQueue<hardware::neuralnetworks::V1_2::FmqRequestDatum,
+                                   hardware::kSynchronizedReadWrite>;
+
+  public:
+    /**
+     * Create the receiving end of a request channel.
+     *
+     * Prefer this call over the constructor.
+     *
+     * @param requestChannel Descriptor for the request channel.
+     * @param pollingTimeWindow How much time (in microseconds) the
+     *     RequestChannelReceiver is allowed to poll the FMQ before waiting on
+     *     the blocking futex. Polling may result in lower latencies at the
+     *     potential cost of more power usage.
+     * @return RequestChannelReceiver on successful creation, nullptr otherwise.
+     */
+    static std::unique_ptr<RequestChannelReceiver> create(
+            const FmqRequestDescriptor& requestChannel,
+            std::chrono::microseconds pollingTimeWindow);
+
+    /**
+     * Get the request from the channel.
+     *
+     * This method will block until either:
+     * 1) The packet has been retrieved, or
+     * 2) The receiver has been invalidated
+     *
+     * @return Request object if successfully received, std::nullopt if error or
+     *     if the receiver object was invalidated.
+     */
+    std::optional<std::tuple<hardware::neuralnetworks::V1_0::Request, std::vector<int32_t>,
+                             hardware::neuralnetworks::V1_2::MeasureTiming>>
+    getBlocking();
+
+    /**
+     * Method to mark the channel as invalid, unblocking any current or future
+     * calls to RequestChannelReceiver::getBlocking.
+     */
+    void invalidate();
+
+    RequestChannelReceiver(std::unique_ptr<FmqRequestChannel> fmqRequestChannel,
+                           std::chrono::microseconds pollingTimeWindow);
+
+  private:
+    std::optional<std::vector<hardware::neuralnetworks::V1_2::FmqRequestDatum>> getPacketBlocking();
+
+    const std::unique_ptr<FmqRequestChannel> mFmqRequestChannel;
+    std::atomic<bool> mTeardown{false};
+    const std::chrono::microseconds kPollingTimeWindow;
+};
+
+/**
+ * ResultChannelSender is responsible for serializing the result packet of
+ * information, sending it on the result channel, and signaling that the data is
+ * available.
+ */
+class ResultChannelSender {
+    using FmqResultChannel = hardware::MessageQueue<hardware::neuralnetworks::V1_2::FmqResultDatum,
+                                                    hardware::kSynchronizedReadWrite>;
+
+  public:
+    /**
+     * Create the sending end of a result channel.
+     *
+     * Prefer this call over the constructor.
+     *
+     * @param resultChannel Descriptor for the result channel.
+     * @return ResultChannelSender on successful creation, nullptr otherwise.
+     */
+    static std::unique_ptr<ResultChannelSender> create(const FmqResultDescriptor& resultChannel);
+
+    /**
+     * Send the result to the channel.
+     *
+     * @param errorStatus Status of the execution.
+     * @param outputShapes Dynamic shapes of the output tensors.
+     * @param timing Timing information of the execution.
+     * @return 'true' on successful send, 'false' otherwise.
+     */
+    bool send(hardware::neuralnetworks::V1_0::ErrorStatus errorStatus,
+              const std::vector<hardware::neuralnetworks::V1_2::OutputShape>& outputShapes,
+              hardware::neuralnetworks::V1_2::Timing timing);
+
+    // prefer calling ResultChannelSender::send
+    bool sendPacket(const std::vector<hardware::neuralnetworks::V1_2::FmqResultDatum>& packet);
+
+    ResultChannelSender(std::unique_ptr<FmqResultChannel> fmqResultChannel);
+
+  private:
+    const std::unique_ptr<FmqResultChannel> mFmqResultChannel;
+};
+
+/**
+ * ResultChannelReceiver is responsible for waiting on the channel until the
+ * packet is available, extracting the packet from the channel, and
+ * deserializing the packet.
+ *
+ * Because the receiver can wait on a packet that may never come (e.g., because
+ * the sending side of the packet has been closed), this object can be
+ * invalidated, unblocking the receiver.
+ */
+class ResultChannelReceiver {
+    using FmqResultDescriptor =
+            hardware::MQDescriptorSync<hardware::neuralnetworks::V1_2::FmqResultDatum>;
+    using FmqResultChannel = hardware::MessageQueue<hardware::neuralnetworks::V1_2::FmqResultDatum,
+                                                    hardware::kSynchronizedReadWrite>;
+
+  public:
+    /**
+     * Create the receiving end of a result channel.
+     *
+     * Prefer this call over the constructor.
+     *
+     * @param channelLength Number of elements in the FMQ.
+     * @param pollingTimeWindow How much time (in microseconds) the
+     *     ResultChannelReceiver is allowed to poll the FMQ before waiting on
+     *     the blocking futex. Polling may result in lower latencies at the
+     *     potential cost of more power usage.
+     * @return A pair of ResultChannelReceiver and the FMQ descriptor on
+     *     successful creation, both nullptr otherwise.
+     */
+    static std::pair<std::unique_ptr<ResultChannelReceiver>, const FmqResultDescriptor*> create(
+            size_t channelLength, std::chrono::microseconds pollingTimeWindow);
+
+    /**
+     * Get the result from the channel.
+     *
+     * This method will block until either:
+     * 1) The packet has been retrieved, or
+     * 2) The receiver has been invalidated
+     *
+     * @return Result object if successfully received, std::nullopt if error or
+     *     if the receiver object was invalidated.
+     */
+    std::optional<std::tuple<hardware::neuralnetworks::V1_0::ErrorStatus,
+                             std::vector<hardware::neuralnetworks::V1_2::OutputShape>,
+                             hardware::neuralnetworks::V1_2::Timing>>
+    getBlocking();
+
+    /**
+     * Method to mark the channel as invalid, unblocking any current or future
+     * calls to ResultChannelReceiver::getBlocking.
+     */
+    void invalidate();
+
+    // prefer calling ResultChannelReceiver::getBlocking
+    std::optional<std::vector<hardware::neuralnetworks::V1_2::FmqResultDatum>> getPacketBlocking();
+
+    ResultChannelReceiver(std::unique_ptr<FmqResultChannel> fmqResultChannel,
+                          std::chrono::microseconds pollingTimeWindow);
+
+  private:
+    const std::unique_ptr<FmqResultChannel> mFmqResultChannel;
+    std::atomic<bool> mValid{true};
+    const std::chrono::microseconds kPollingTimeWindow;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_EXECUTION_BURST_UTILS_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h
index 6a56a82..fb11130 100644
--- a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h
@@ -36,7 +36,8 @@
 namespace android::hardware::neuralnetworks::V1_2::utils {
 
 // Class that adapts V1_2::IPreparedModel to nn::IPreparedModel.
-class PreparedModel final : public nn::IPreparedModel {
+class PreparedModel final : public nn::IPreparedModel,
+                            public std::enable_shared_from_this<PreparedModel> {
     struct PrivateConstructorTag {};
 
   public:
@@ -57,6 +58,8 @@
             const nn::OptionalDuration& loopTimeoutDuration,
             const nn::OptionalDuration& timeoutDurationAfterFence) const override;
 
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurst() const override;
+
     std::any getUnderlyingResource() const override;
 
   private:
diff --git a/neuralnetworks/1.2/utils/src/Device.cpp b/neuralnetworks/1.2/utils/src/Device.cpp
index 9fe0de2..1954dfa 100644
--- a/neuralnetworks/1.2/utils/src/Device.cpp
+++ b/neuralnetworks/1.2/utils/src/Device.cpp
@@ -199,6 +199,10 @@
     return kDeviceType;
 }
 
+bool Device::isUpdatable() const {
+    return false;
+}
+
 const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
     return kExtensions;
 }
diff --git a/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp b/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp
new file mode 100644
index 0000000..2265861
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp
@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "ExecutionBurstController"
+
+#include "ExecutionBurstController.h"
+
+#include <android-base/logging.h>
+
+#include <algorithm>
+#include <cstring>
+#include <limits>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+#include "ExecutionBurstUtils.h"
+#include "HalInterfaces.h"
+#include "Tracing.h"
+#include "Utils.h"
+
+namespace android::nn {
+namespace {
+
+class BurstContextDeathHandler : public hardware::hidl_death_recipient {
+  public:
+    using Callback = std::function<void()>;
+
+    BurstContextDeathHandler(const Callback& onDeathCallback) : mOnDeathCallback(onDeathCallback) {
+        CHECK(onDeathCallback != nullptr);
+    }
+
+    void serviceDied(uint64_t /*cookie*/, const wp<hidl::base::V1_0::IBase>& /*who*/) override {
+        LOG(ERROR) << "BurstContextDeathHandler::serviceDied -- service unexpectedly died!";
+        mOnDeathCallback();
+    }
+
+  private:
+    const Callback mOnDeathCallback;
+};
+
+}  // anonymous namespace
+
+hardware::Return<void> ExecutionBurstController::ExecutionBurstCallback::getMemories(
+        const hardware::hidl_vec<int32_t>& slots, getMemories_cb cb) {
+    std::lock_guard<std::mutex> guard(mMutex);
+
+    // get all memories
+    hardware::hidl_vec<hardware::hidl_memory> memories(slots.size());
+    std::transform(slots.begin(), slots.end(), memories.begin(), [this](int32_t slot) {
+        return slot < mMemoryCache.size() ? mMemoryCache[slot] : hardware::hidl_memory{};
+    });
+
+    // ensure all memories are valid
+    if (!std::all_of(memories.begin(), memories.end(),
+                     [](const hardware::hidl_memory& memory) { return memory.valid(); })) {
+        cb(V1_0::ErrorStatus::INVALID_ARGUMENT, {});
+        return hardware::Void();
+    }
+
+    // return successful
+    cb(V1_0::ErrorStatus::NONE, std::move(memories));
+    return hardware::Void();
+}
+
+std::vector<int32_t> ExecutionBurstController::ExecutionBurstCallback::getSlots(
+        const hardware::hidl_vec<hardware::hidl_memory>& memories,
+        const std::vector<intptr_t>& keys) {
+    std::lock_guard<std::mutex> guard(mMutex);
+
+    // retrieve (or bind) all slots corresponding to memories
+    std::vector<int32_t> slots;
+    slots.reserve(memories.size());
+    for (size_t i = 0; i < memories.size(); ++i) {
+        slots.push_back(getSlotLocked(memories[i], keys[i]));
+    }
+    return slots;
+}
+
+std::pair<bool, int32_t> ExecutionBurstController::ExecutionBurstCallback::freeMemory(
+        intptr_t key) {
+    std::lock_guard<std::mutex> guard(mMutex);
+
+    auto iter = mMemoryIdToSlot.find(key);
+    if (iter == mMemoryIdToSlot.end()) {
+        return {false, 0};
+    }
+    const int32_t slot = iter->second;
+    mMemoryIdToSlot.erase(key);
+    mMemoryCache[slot] = {};
+    mFreeSlots.push(slot);
+    return {true, slot};
+}
+
+int32_t ExecutionBurstController::ExecutionBurstCallback::getSlotLocked(
+        const hardware::hidl_memory& memory, intptr_t key) {
+    auto iter = mMemoryIdToSlot.find(key);
+    if (iter == mMemoryIdToSlot.end()) {
+        const int32_t slot = allocateSlotLocked();
+        mMemoryIdToSlot[key] = slot;
+        mMemoryCache[slot] = memory;
+        return slot;
+    } else {
+        const int32_t slot = iter->second;
+        return slot;
+    }
+}
+
+int32_t ExecutionBurstController::ExecutionBurstCallback::allocateSlotLocked() {
+    constexpr size_t kMaxNumberOfSlots = std::numeric_limits<int32_t>::max();
+
+    // if there is a free slot, use it
+    if (mFreeSlots.size() > 0) {
+        const int32_t slot = mFreeSlots.top();
+        mFreeSlots.pop();
+        return slot;
+    }
+
+    // otherwise use a slot for the first time
+    CHECK(mMemoryCache.size() < kMaxNumberOfSlots) << "Exceeded maximum number of slots!";
+    const int32_t slot = static_cast<int32_t>(mMemoryCache.size());
+    mMemoryCache.emplace_back();
+
+    return slot;
+}
+
+std::unique_ptr<ExecutionBurstController> ExecutionBurstController::create(
+        const sp<V1_2::IPreparedModel>& preparedModel,
+        std::chrono::microseconds pollingTimeWindow) {
+    // check inputs
+    if (preparedModel == nullptr) {
+        LOG(ERROR) << "ExecutionBurstController::create passed a nullptr";
+        return nullptr;
+    }
+
+    // create callback object
+    sp<ExecutionBurstCallback> callback = new ExecutionBurstCallback();
+
+    // create FMQ objects
+    auto [requestChannelSenderTemp, requestChannelDescriptor] =
+            RequestChannelSender::create(kExecutionBurstChannelLength);
+    auto [resultChannelReceiverTemp, resultChannelDescriptor] =
+            ResultChannelReceiver::create(kExecutionBurstChannelLength, pollingTimeWindow);
+    std::shared_ptr<RequestChannelSender> requestChannelSender =
+            std::move(requestChannelSenderTemp);
+    std::shared_ptr<ResultChannelReceiver> resultChannelReceiver =
+            std::move(resultChannelReceiverTemp);
+
+    // check FMQ objects
+    if (!requestChannelSender || !resultChannelReceiver || !requestChannelDescriptor ||
+        !resultChannelDescriptor) {
+        LOG(ERROR) << "ExecutionBurstController::create failed to create FastMessageQueue";
+        return nullptr;
+    }
+
+    // configure burst
+    V1_0::ErrorStatus errorStatus;
+    sp<IBurstContext> burstContext;
+    const hardware::Return<void> ret = preparedModel->configureExecutionBurst(
+            callback, *requestChannelDescriptor, *resultChannelDescriptor,
+            [&errorStatus, &burstContext](V1_0::ErrorStatus status,
+                                          const sp<IBurstContext>& context) {
+                errorStatus = status;
+                burstContext = context;
+            });
+
+    // check burst
+    if (!ret.isOk()) {
+        LOG(ERROR) << "IPreparedModel::configureExecutionBurst failed with description "
+                   << ret.description();
+        return nullptr;
+    }
+    if (errorStatus != V1_0::ErrorStatus::NONE) {
+        LOG(ERROR) << "IPreparedModel::configureExecutionBurst failed with status "
+                   << toString(errorStatus);
+        return nullptr;
+    }
+    if (burstContext == nullptr) {
+        LOG(ERROR) << "IPreparedModel::configureExecutionBurst returned nullptr for burst";
+        return nullptr;
+    }
+
+    // create death handler object
+    BurstContextDeathHandler::Callback onDeathCallback = [requestChannelSender,
+                                                          resultChannelReceiver] {
+        requestChannelSender->invalidate();
+        resultChannelReceiver->invalidate();
+    };
+    const sp<BurstContextDeathHandler> deathHandler = new BurstContextDeathHandler(onDeathCallback);
+
+    // linkToDeath registers a callback that will be invoked on service death to
+    // proactively handle service crashes. If the linkToDeath call fails,
+    // asynchronous calls are susceptible to hangs if the service crashes before
+    // providing the response.
+    const hardware::Return<bool> deathHandlerRet = burstContext->linkToDeath(deathHandler, 0);
+    if (!deathHandlerRet.isOk() || deathHandlerRet != true) {
+        LOG(ERROR) << "ExecutionBurstController::create -- Failed to register a death recipient "
+                      "for the IBurstContext object.";
+        return nullptr;
+    }
+
+    // make and return controller
+    return std::make_unique<ExecutionBurstController>(requestChannelSender, resultChannelReceiver,
+                                                      burstContext, callback, deathHandler);
+}
+
+ExecutionBurstController::ExecutionBurstController(
+        const std::shared_ptr<RequestChannelSender>& requestChannelSender,
+        const std::shared_ptr<ResultChannelReceiver>& resultChannelReceiver,
+        const sp<IBurstContext>& burstContext, const sp<ExecutionBurstCallback>& callback,
+        const sp<hardware::hidl_death_recipient>& deathHandler)
+    : mRequestChannelSender(requestChannelSender),
+      mResultChannelReceiver(resultChannelReceiver),
+      mBurstContext(burstContext),
+      mMemoryCache(callback),
+      mDeathHandler(deathHandler) {}
+
+ExecutionBurstController::~ExecutionBurstController() {
+    // It is safe to ignore any errors resulting from this unlinkToDeath call
+    // because the ExecutionBurstController object is already being destroyed
+    // and its underlying IBurstContext object is no longer being used by the NN
+    // runtime.
+    if (mDeathHandler) {
+        mBurstContext->unlinkToDeath(mDeathHandler).isOk();
+    }
+}
+
+static std::tuple<int, std::vector<V1_2::OutputShape>, V1_2::Timing, bool> getExecutionResult(
+        V1_0::ErrorStatus status, std::vector<V1_2::OutputShape> outputShapes, V1_2::Timing timing,
+        bool fallback) {
+    auto [n, checkedOutputShapes, checkedTiming] =
+            getExecutionResult(convertToV1_3(status), std::move(outputShapes), timing);
+    return {n, convertToV1_2(checkedOutputShapes), convertToV1_2(checkedTiming), fallback};
+}
+
+std::tuple<int, std::vector<V1_2::OutputShape>, V1_2::Timing, bool>
+ExecutionBurstController::compute(const V1_0::Request& request, V1_2::MeasureTiming measure,
+                                  const std::vector<intptr_t>& memoryIds) {
+    // This is the first point when we know an execution is occurring, so begin
+    // to collect systraces. Note that the first point we can begin collecting
+    // systraces in ExecutionBurstServer is when the RequestChannelReceiver
+    // realizes there is data in the FMQ, so ExecutionBurstServer collects
+    // systraces at different points in the code.
+    NNTRACE_FULL(NNTRACE_LAYER_IPC, NNTRACE_PHASE_EXECUTION, "ExecutionBurstController::compute");
+
+    std::lock_guard<std::mutex> guard(mMutex);
+
+    // send request packet
+    const std::vector<int32_t> slots = mMemoryCache->getSlots(request.pools, memoryIds);
+    const bool success = mRequestChannelSender->send(request, measure, slots);
+    if (!success) {
+        LOG(ERROR) << "Error sending FMQ packet";
+        // only use fallback execution path if the packet could not be sent
+        return getExecutionResult(V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming12,
+                                  /*fallback=*/true);
+    }
+
+    // get result packet
+    const auto result = mResultChannelReceiver->getBlocking();
+    if (!result) {
+        LOG(ERROR) << "Error retrieving FMQ packet";
+        // only use fallback execution path if the packet could not be sent
+        return getExecutionResult(V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming12,
+                                  /*fallback=*/false);
+    }
+
+    // unpack results and return (only use fallback execution path if the
+    // packet could not be sent)
+    auto [status, outputShapes, timing] = std::move(*result);
+    return getExecutionResult(status, std::move(outputShapes), timing, /*fallback=*/false);
+}
+
+void ExecutionBurstController::freeMemory(intptr_t key) {
+    std::lock_guard<std::mutex> guard(mMutex);
+
+    bool valid;
+    int32_t slot;
+    std::tie(valid, slot) = mMemoryCache->freeMemory(key);
+    if (valid) {
+        mBurstContext->freeMemory(slot).isOk();
+    }
+}
+
+}  // namespace android::nn
diff --git a/neuralnetworks/1.2/utils/src/ExecutionBurstServer.cpp b/neuralnetworks/1.2/utils/src/ExecutionBurstServer.cpp
new file mode 100644
index 0000000..022548d
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/ExecutionBurstServer.cpp
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "ExecutionBurstServer"
+
+#include "ExecutionBurstServer.h"
+
+#include <android-base/logging.h>
+
+#include <algorithm>
+#include <cstring>
+#include <limits>
+#include <map>
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+#include "ExecutionBurstUtils.h"
+#include "HalInterfaces.h"
+#include "Tracing.h"
+
+namespace android::nn {
+namespace {
+
+// DefaultBurstExecutorWithCache adapts an IPreparedModel so that it can be
+// used as an IBurstExecutorWithCache. Specifically, the cache simply stores the
+// hidl_memory object, and the execution forwards calls to the provided
+// IPreparedModel's "executeSynchronously" method. With this class, hidl_memory
+// must be mapped and unmapped for each execution.
+class DefaultBurstExecutorWithCache : public ExecutionBurstServer::IBurstExecutorWithCache {
+  public:
+    DefaultBurstExecutorWithCache(V1_2::IPreparedModel* preparedModel)
+        : mpPreparedModel(preparedModel) {}
+
+    bool isCacheEntryPresent(int32_t slot) const override {
+        const auto it = mMemoryCache.find(slot);
+        return (it != mMemoryCache.end()) && it->second.valid();
+    }
+
+    void addCacheEntry(const hardware::hidl_memory& memory, int32_t slot) override {
+        mMemoryCache[slot] = memory;
+    }
+
+    void removeCacheEntry(int32_t slot) override { mMemoryCache.erase(slot); }
+
+    std::tuple<V1_0::ErrorStatus, hardware::hidl_vec<V1_2::OutputShape>, V1_2::Timing> execute(
+            const V1_0::Request& request, const std::vector<int32_t>& slots,
+            V1_2::MeasureTiming measure) override {
+        // convert slots to pools
+        hardware::hidl_vec<hardware::hidl_memory> pools(slots.size());
+        std::transform(slots.begin(), slots.end(), pools.begin(),
+                       [this](int32_t slot) { return mMemoryCache[slot]; });
+
+        // create full request
+        V1_0::Request fullRequest = request;
+        fullRequest.pools = std::move(pools);
+
+        // setup execution
+        V1_0::ErrorStatus returnedStatus = V1_0::ErrorStatus::GENERAL_FAILURE;
+        hardware::hidl_vec<V1_2::OutputShape> returnedOutputShapes;
+        V1_2::Timing returnedTiming;
+        auto cb = [&returnedStatus, &returnedOutputShapes, &returnedTiming](
+                          V1_0::ErrorStatus status,
+                          const hardware::hidl_vec<V1_2::OutputShape>& outputShapes,
+                          const V1_2::Timing& timing) {
+            returnedStatus = status;
+            returnedOutputShapes = outputShapes;
+            returnedTiming = timing;
+        };
+
+        // execute
+        const hardware::Return<void> ret =
+                mpPreparedModel->executeSynchronously(fullRequest, measure, cb);
+        if (!ret.isOk() || returnedStatus != V1_0::ErrorStatus::NONE) {
+            LOG(ERROR) << "IPreparedModelAdapter::execute -- Error executing";
+            return {returnedStatus, std::move(returnedOutputShapes), kNoTiming};
+        }
+
+        return std::make_tuple(returnedStatus, std::move(returnedOutputShapes), returnedTiming);
+    }
+
+  private:
+    V1_2::IPreparedModel* const mpPreparedModel;
+    std::map<int32_t, hardware::hidl_memory> mMemoryCache;
+};
+
+}  // anonymous namespace
+
+// ExecutionBurstServer methods
+
+sp<ExecutionBurstServer> ExecutionBurstServer::create(
+        const sp<IBurstCallback>& callback, const MQDescriptorSync<FmqRequestDatum>& requestChannel,
+        const MQDescriptorSync<FmqResultDatum>& resultChannel,
+        std::shared_ptr<IBurstExecutorWithCache> executorWithCache,
+        std::chrono::microseconds pollingTimeWindow) {
+    // check inputs
+    if (callback == nullptr || executorWithCache == nullptr) {
+        LOG(ERROR) << "ExecutionBurstServer::create passed a nullptr";
+        return nullptr;
+    }
+
+    // create FMQ objects
+    std::unique_ptr<RequestChannelReceiver> requestChannelReceiver =
+            RequestChannelReceiver::create(requestChannel, pollingTimeWindow);
+    std::unique_ptr<ResultChannelSender> resultChannelSender =
+            ResultChannelSender::create(resultChannel);
+
+    // check FMQ objects
+    if (!requestChannelReceiver || !resultChannelSender) {
+        LOG(ERROR) << "ExecutionBurstServer::create failed to create FastMessageQueue";
+        return nullptr;
+    }
+
+    // make and return context
+    return new ExecutionBurstServer(callback, std::move(requestChannelReceiver),
+                                    std::move(resultChannelSender), std::move(executorWithCache));
+}
+
+sp<ExecutionBurstServer> ExecutionBurstServer::create(
+        const sp<IBurstCallback>& callback, const MQDescriptorSync<FmqRequestDatum>& requestChannel,
+        const MQDescriptorSync<FmqResultDatum>& resultChannel, V1_2::IPreparedModel* preparedModel,
+        std::chrono::microseconds pollingTimeWindow) {
+    // check relevant input
+    if (preparedModel == nullptr) {
+        LOG(ERROR) << "ExecutionBurstServer::create passed a nullptr";
+        return nullptr;
+    }
+
+    // adapt IPreparedModel to have caching
+    const std::shared_ptr<DefaultBurstExecutorWithCache> preparedModelAdapter =
+            std::make_shared<DefaultBurstExecutorWithCache>(preparedModel);
+
+    // make and return context
+    return ExecutionBurstServer::create(callback, requestChannel, resultChannel,
+                                        preparedModelAdapter, pollingTimeWindow);
+}
+
+ExecutionBurstServer::ExecutionBurstServer(
+        const sp<IBurstCallback>& callback, std::unique_ptr<RequestChannelReceiver> requestChannel,
+        std::unique_ptr<ResultChannelSender> resultChannel,
+        std::shared_ptr<IBurstExecutorWithCache> executorWithCache)
+    : mCallback(callback),
+      mRequestChannelReceiver(std::move(requestChannel)),
+      mResultChannelSender(std::move(resultChannel)),
+      mExecutorWithCache(std::move(executorWithCache)) {
+    // TODO: highly document the threading behavior of this class
+    mWorker = std::thread([this] { task(); });
+}
+
+ExecutionBurstServer::~ExecutionBurstServer() {
+    // set teardown flag
+    mTeardown = true;
+    mRequestChannelReceiver->invalidate();
+
+    // wait for task thread to end
+    mWorker.join();
+}
+
+hardware::Return<void> ExecutionBurstServer::freeMemory(int32_t slot) {
+    std::lock_guard<std::mutex> hold(mMutex);
+    mExecutorWithCache->removeCacheEntry(slot);
+    return hardware::Void();
+}
+
+void ExecutionBurstServer::ensureCacheEntriesArePresentLocked(const std::vector<int32_t>& slots) {
+    const auto slotIsKnown = [this](int32_t slot) {
+        return mExecutorWithCache->isCacheEntryPresent(slot);
+    };
+
+    // find unique unknown slots
+    std::vector<int32_t> unknownSlots = slots;
+    auto unknownSlotsEnd = unknownSlots.end();
+    std::sort(unknownSlots.begin(), unknownSlotsEnd);
+    unknownSlotsEnd = std::unique(unknownSlots.begin(), unknownSlotsEnd);
+    unknownSlotsEnd = std::remove_if(unknownSlots.begin(), unknownSlotsEnd, slotIsKnown);
+    unknownSlots.erase(unknownSlotsEnd, unknownSlots.end());
+
+    // quick-exit if all slots are known
+    if (unknownSlots.empty()) {
+        return;
+    }
+
+    V1_0::ErrorStatus errorStatus = V1_0::ErrorStatus::GENERAL_FAILURE;
+    std::vector<hardware::hidl_memory> returnedMemories;
+    auto cb = [&errorStatus, &returnedMemories](
+                      V1_0::ErrorStatus status,
+                      const hardware::hidl_vec<hardware::hidl_memory>& memories) {
+        errorStatus = status;
+        returnedMemories = memories;
+    };
+
+    const hardware::Return<void> ret = mCallback->getMemories(unknownSlots, cb);
+
+    if (!ret.isOk() || errorStatus != V1_0::ErrorStatus::NONE ||
+        returnedMemories.size() != unknownSlots.size()) {
+        LOG(ERROR) << "Error retrieving memories";
+        return;
+    }
+
+    // add memories to unknown slots
+    for (size_t i = 0; i < unknownSlots.size(); ++i) {
+        mExecutorWithCache->addCacheEntry(returnedMemories[i], unknownSlots[i]);
+    }
+}
+
+void ExecutionBurstServer::task() {
+    // loop until the burst object is being destroyed
+    while (!mTeardown) {
+        // receive request
+        auto arguments = mRequestChannelReceiver->getBlocking();
+
+        // if the request packet was not properly received, return a generic
+        // error and skip the execution
+        //
+        // if the burst is being torn down, skip the execution so the "task"
+        // function can end
+        if (!arguments) {
+            if (!mTeardown) {
+                mResultChannelSender->send(V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming);
+            }
+            continue;
+        }
+
+        // otherwise begin tracing execution
+        NNTRACE_FULL(NNTRACE_LAYER_IPC, NNTRACE_PHASE_EXECUTION,
+                     "ExecutionBurstServer getting memory, executing, and returning results");
+
+        // unpack the arguments; types are Request, std::vector<int32_t>, and
+        // MeasureTiming, respectively
+        const auto [requestWithoutPools, slotsOfPools, measure] = std::move(*arguments);
+
+        // ensure executor with cache has required memory
+        std::lock_guard<std::mutex> hold(mMutex);
+        ensureCacheEntriesArePresentLocked(slotsOfPools);
+
+        // perform computation; types are ErrorStatus, hidl_vec<OutputShape>,
+        // and Timing, respectively
+        const auto [errorStatus, outputShapes, returnedTiming] =
+                mExecutorWithCache->execute(requestWithoutPools, slotsOfPools, measure);
+
+        // return result
+        mResultChannelSender->send(errorStatus, outputShapes, returnedTiming);
+    }
+}
+
+}  // namespace android::nn
diff --git a/neuralnetworks/1.2/utils/src/ExecutionBurstUtils.cpp b/neuralnetworks/1.2/utils/src/ExecutionBurstUtils.cpp
new file mode 100644
index 0000000..f0275f9
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/ExecutionBurstUtils.cpp
@@ -0,0 +1,749 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "ExecutionBurstUtils"
+
+#include "ExecutionBurstUtils.h"
+
+#include <android-base/logging.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+
+#include <atomic>
+#include <chrono>
+#include <memory>
+#include <thread>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+namespace {
+
+constexpr V1_2::Timing kNoTiming = {std::numeric_limits<uint64_t>::max(),
+                                    std::numeric_limits<uint64_t>::max()};
+
+}
+
+// serialize a request into a packet
+std::vector<FmqRequestDatum> serialize(const V1_0::Request& request, V1_2::MeasureTiming measure,
+                                       const std::vector<int32_t>& slots) {
+    // count how many elements need to be sent for a request
+    size_t count = 2 + request.inputs.size() + request.outputs.size() + request.pools.size();
+    for (const auto& input : request.inputs) {
+        count += input.dimensions.size();
+    }
+    for (const auto& output : request.outputs) {
+        count += output.dimensions.size();
+    }
+
+    // create buffer to temporarily store elements
+    std::vector<FmqRequestDatum> data;
+    data.reserve(count);
+
+    // package packetInfo
+    {
+        FmqRequestDatum datum;
+        datum.packetInformation(
+                {/*.packetSize=*/static_cast<uint32_t>(count),
+                 /*.numberOfInputOperands=*/static_cast<uint32_t>(request.inputs.size()),
+                 /*.numberOfOutputOperands=*/static_cast<uint32_t>(request.outputs.size()),
+                 /*.numberOfPools=*/static_cast<uint32_t>(request.pools.size())});
+        data.push_back(datum);
+    }
+
+    // package input data
+    for (const auto& input : request.inputs) {
+        // package operand information
+        FmqRequestDatum datum;
+        datum.inputOperandInformation(
+                {/*.hasNoValue=*/input.hasNoValue,
+                 /*.location=*/input.location,
+                 /*.numberOfDimensions=*/static_cast<uint32_t>(input.dimensions.size())});
+        data.push_back(datum);
+
+        // package operand dimensions
+        for (uint32_t dimension : input.dimensions) {
+            FmqRequestDatum datum;
+            datum.inputOperandDimensionValue(dimension);
+            data.push_back(datum);
+        }
+    }
+
+    // package output data
+    for (const auto& output : request.outputs) {
+        // package operand information
+        FmqRequestDatum datum;
+        datum.outputOperandInformation(
+                {/*.hasNoValue=*/output.hasNoValue,
+                 /*.location=*/output.location,
+                 /*.numberOfDimensions=*/static_cast<uint32_t>(output.dimensions.size())});
+        data.push_back(datum);
+
+        // package operand dimensions
+        for (uint32_t dimension : output.dimensions) {
+            FmqRequestDatum datum;
+            datum.outputOperandDimensionValue(dimension);
+            data.push_back(datum);
+        }
+    }
+
+    // package pool identifier
+    for (int32_t slot : slots) {
+        FmqRequestDatum datum;
+        datum.poolIdentifier(slot);
+        data.push_back(datum);
+    }
+
+    // package measureTiming
+    {
+        FmqRequestDatum datum;
+        datum.measureTiming(measure);
+        data.push_back(datum);
+    }
+
+    // return packet
+    return data;
+}
+
+// serialize result
+std::vector<FmqResultDatum> serialize(V1_0::ErrorStatus errorStatus,
+                                      const std::vector<V1_2::OutputShape>& outputShapes,
+                                      V1_2::Timing timing) {
+    // count how many elements need to be sent for a request
+    size_t count = 2 + outputShapes.size();
+    for (const auto& outputShape : outputShapes) {
+        count += outputShape.dimensions.size();
+    }
+
+    // create buffer to temporarily store elements
+    std::vector<FmqResultDatum> data;
+    data.reserve(count);
+
+    // package packetInfo
+    {
+        FmqResultDatum datum;
+        datum.packetInformation({/*.packetSize=*/static_cast<uint32_t>(count),
+                                 /*.errorStatus=*/errorStatus,
+                                 /*.numberOfOperands=*/static_cast<uint32_t>(outputShapes.size())});
+        data.push_back(datum);
+    }
+
+    // package output shape data
+    for (const auto& operand : outputShapes) {
+        // package operand information
+        FmqResultDatum::OperandInformation info{};
+        info.isSufficient = operand.isSufficient;
+        info.numberOfDimensions = static_cast<uint32_t>(operand.dimensions.size());
+
+        FmqResultDatum datum;
+        datum.operandInformation(info);
+        data.push_back(datum);
+
+        // package operand dimensions
+        for (uint32_t dimension : operand.dimensions) {
+            FmqResultDatum datum;
+            datum.operandDimensionValue(dimension);
+            data.push_back(datum);
+        }
+    }
+
+    // package executionTiming
+    {
+        FmqResultDatum datum;
+        datum.executionTiming(timing);
+        data.push_back(datum);
+    }
+
+    // return result
+    return data;
+}
+
+// deserialize request
+std::optional<std::tuple<V1_0::Request, std::vector<int32_t>, V1_2::MeasureTiming>> deserialize(
+        const std::vector<FmqRequestDatum>& data) {
+    using discriminator = FmqRequestDatum::hidl_discriminator;
+
+    size_t index = 0;
+
+    // validate packet information
+    if (data.size() == 0 || data[index].getDiscriminator() != discriminator::packetInformation) {
+        LOG(ERROR) << "FMQ Request packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage packet information
+    const FmqRequestDatum::PacketInformation& packetInfo = data[index].packetInformation();
+    index++;
+    const uint32_t packetSize = packetInfo.packetSize;
+    const uint32_t numberOfInputOperands = packetInfo.numberOfInputOperands;
+    const uint32_t numberOfOutputOperands = packetInfo.numberOfOutputOperands;
+    const uint32_t numberOfPools = packetInfo.numberOfPools;
+
+    // verify packet size
+    if (data.size() != packetSize) {
+        LOG(ERROR) << "FMQ Request packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage input operands
+    std::vector<V1_0::RequestArgument> inputs;
+    inputs.reserve(numberOfInputOperands);
+    for (size_t operand = 0; operand < numberOfInputOperands; ++operand) {
+        // validate input operand information
+        if (data[index].getDiscriminator() != discriminator::inputOperandInformation) {
+            LOG(ERROR) << "FMQ Request packet ill-formed";
+            return std::nullopt;
+        }
+
+        // unpackage operand information
+        const FmqRequestDatum::OperandInformation& operandInfo =
+                data[index].inputOperandInformation();
+        index++;
+        const bool hasNoValue = operandInfo.hasNoValue;
+        const V1_0::DataLocation location = operandInfo.location;
+        const uint32_t numberOfDimensions = operandInfo.numberOfDimensions;
+
+        // unpackage operand dimensions
+        std::vector<uint32_t> dimensions;
+        dimensions.reserve(numberOfDimensions);
+        for (size_t i = 0; i < numberOfDimensions; ++i) {
+            // validate dimension
+            if (data[index].getDiscriminator() != discriminator::inputOperandDimensionValue) {
+                LOG(ERROR) << "FMQ Request packet ill-formed";
+                return std::nullopt;
+            }
+
+            // unpackage dimension
+            const uint32_t dimension = data[index].inputOperandDimensionValue();
+            index++;
+
+            // store result
+            dimensions.push_back(dimension);
+        }
+
+        // store result
+        inputs.push_back(
+                {/*.hasNoValue=*/hasNoValue, /*.location=*/location, /*.dimensions=*/dimensions});
+    }
+
+    // unpackage output operands
+    std::vector<V1_0::RequestArgument> outputs;
+    outputs.reserve(numberOfOutputOperands);
+    for (size_t operand = 0; operand < numberOfOutputOperands; ++operand) {
+        // validate output operand information
+        if (data[index].getDiscriminator() != discriminator::outputOperandInformation) {
+            LOG(ERROR) << "FMQ Request packet ill-formed";
+            return std::nullopt;
+        }
+
+        // unpackage operand information
+        const FmqRequestDatum::OperandInformation& operandInfo =
+                data[index].outputOperandInformation();
+        index++;
+        const bool hasNoValue = operandInfo.hasNoValue;
+        const V1_0::DataLocation location = operandInfo.location;
+        const uint32_t numberOfDimensions = operandInfo.numberOfDimensions;
+
+        // unpackage operand dimensions
+        std::vector<uint32_t> dimensions;
+        dimensions.reserve(numberOfDimensions);
+        for (size_t i = 0; i < numberOfDimensions; ++i) {
+            // validate dimension
+            if (data[index].getDiscriminator() != discriminator::outputOperandDimensionValue) {
+                LOG(ERROR) << "FMQ Request packet ill-formed";
+                return std::nullopt;
+            }
+
+            // unpackage dimension
+            const uint32_t dimension = data[index].outputOperandDimensionValue();
+            index++;
+
+            // store result
+            dimensions.push_back(dimension);
+        }
+
+        // store result
+        outputs.push_back(
+                {/*.hasNoValue=*/hasNoValue, /*.location=*/location, /*.dimensions=*/dimensions});
+    }
+
+    // unpackage pools
+    std::vector<int32_t> slots;
+    slots.reserve(numberOfPools);
+    for (size_t pool = 0; pool < numberOfPools; ++pool) {
+        // validate input operand information
+        if (data[index].getDiscriminator() != discriminator::poolIdentifier) {
+            LOG(ERROR) << "FMQ Request packet ill-formed";
+            return std::nullopt;
+        }
+
+        // unpackage operand information
+        const int32_t poolId = data[index].poolIdentifier();
+        index++;
+
+        // store result
+        slots.push_back(poolId);
+    }
+
+    // validate measureTiming
+    if (data[index].getDiscriminator() != discriminator::measureTiming) {
+        LOG(ERROR) << "FMQ Request packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage measureTiming
+    const V1_2::MeasureTiming measure = data[index].measureTiming();
+    index++;
+
+    // validate packet information
+    if (index != packetSize) {
+        LOG(ERROR) << "FMQ Result packet ill-formed";
+        return std::nullopt;
+    }
+
+    // return request
+    V1_0::Request request = {/*.inputs=*/inputs, /*.outputs=*/outputs, /*.pools=*/{}};
+    return std::make_tuple(std::move(request), std::move(slots), measure);
+}
+
+// deserialize a packet into the result
+std::optional<std::tuple<V1_0::ErrorStatus, std::vector<V1_2::OutputShape>, V1_2::Timing>>
+deserialize(const std::vector<FmqResultDatum>& data) {
+    using discriminator = FmqResultDatum::hidl_discriminator;
+
+    std::vector<V1_2::OutputShape> outputShapes;
+    size_t index = 0;
+
+    // validate packet information
+    if (data.size() == 0 || data[index].getDiscriminator() != discriminator::packetInformation) {
+        LOG(ERROR) << "FMQ Result packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage packet information
+    const FmqResultDatum::PacketInformation& packetInfo = data[index].packetInformation();
+    index++;
+    const uint32_t packetSize = packetInfo.packetSize;
+    const V1_0::ErrorStatus errorStatus = packetInfo.errorStatus;
+    const uint32_t numberOfOperands = packetInfo.numberOfOperands;
+
+    // verify packet size
+    if (data.size() != packetSize) {
+        LOG(ERROR) << "FMQ Result packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage operands
+    for (size_t operand = 0; operand < numberOfOperands; ++operand) {
+        // validate operand information
+        if (data[index].getDiscriminator() != discriminator::operandInformation) {
+            LOG(ERROR) << "FMQ Result packet ill-formed";
+            return std::nullopt;
+        }
+
+        // unpackage operand information
+        const FmqResultDatum::OperandInformation& operandInfo = data[index].operandInformation();
+        index++;
+        const bool isSufficient = operandInfo.isSufficient;
+        const uint32_t numberOfDimensions = operandInfo.numberOfDimensions;
+
+        // unpackage operand dimensions
+        std::vector<uint32_t> dimensions;
+        dimensions.reserve(numberOfDimensions);
+        for (size_t i = 0; i < numberOfDimensions; ++i) {
+            // validate dimension
+            if (data[index].getDiscriminator() != discriminator::operandDimensionValue) {
+                LOG(ERROR) << "FMQ Result packet ill-formed";
+                return std::nullopt;
+            }
+
+            // unpackage dimension
+            const uint32_t dimension = data[index].operandDimensionValue();
+            index++;
+
+            // store result
+            dimensions.push_back(dimension);
+        }
+
+        // store result
+        outputShapes.push_back({/*.dimensions=*/dimensions, /*.isSufficient=*/isSufficient});
+    }
+
+    // validate execution timing
+    if (data[index].getDiscriminator() != discriminator::executionTiming) {
+        LOG(ERROR) << "FMQ Result packet ill-formed";
+        return std::nullopt;
+    }
+
+    // unpackage execution timing
+    const V1_2::Timing timing = data[index].executionTiming();
+    index++;
+
+    // validate packet information
+    if (index != packetSize) {
+        LOG(ERROR) << "FMQ Result packet ill-formed";
+        return std::nullopt;
+    }
+
+    // return result
+    return std::make_tuple(errorStatus, std::move(outputShapes), timing);
+}
+
+V1_0::ErrorStatus legacyConvertResultCodeToErrorStatus(int resultCode) {
+    return convertToV1_0(convertResultCodeToErrorStatus(resultCode));
+}
+
+// RequestChannelSender methods
+
+std::pair<std::unique_ptr<RequestChannelSender>, const FmqRequestDescriptor*>
+RequestChannelSender::create(size_t channelLength) {
+    std::unique_ptr<FmqRequestChannel> fmqRequestChannel =
+            std::make_unique<FmqRequestChannel>(channelLength, /*confEventFlag=*/true);
+    if (!fmqRequestChannel->isValid()) {
+        LOG(ERROR) << "Unable to create RequestChannelSender";
+        return {nullptr, nullptr};
+    }
+
+    const FmqRequestDescriptor* descriptor = fmqRequestChannel->getDesc();
+    return std::make_pair(std::make_unique<RequestChannelSender>(std::move(fmqRequestChannel)),
+                          descriptor);
+}
+
+RequestChannelSender::RequestChannelSender(std::unique_ptr<FmqRequestChannel> fmqRequestChannel)
+    : mFmqRequestChannel(std::move(fmqRequestChannel)) {}
+
+bool RequestChannelSender::send(const V1_0::Request& request, V1_2::MeasureTiming measure,
+                                const std::vector<int32_t>& slots) {
+    const std::vector<FmqRequestDatum> serialized = serialize(request, measure, slots);
+    return sendPacket(serialized);
+}
+
+bool RequestChannelSender::sendPacket(const std::vector<FmqRequestDatum>& packet) {
+    if (!mValid) {
+        return false;
+    }
+
+    if (packet.size() > mFmqRequestChannel->availableToWrite()) {
+        LOG(ERROR)
+                << "RequestChannelSender::sendPacket -- packet size exceeds size available in FMQ";
+        return false;
+    }
+
+    // Always send the packet with "blocking" because this signals the futex and
+    // unblocks the consumer if it is waiting on the futex.
+    return mFmqRequestChannel->writeBlocking(packet.data(), packet.size());
+}
+
+void RequestChannelSender::invalidate() {
+    mValid = false;
+}
+
+// RequestChannelReceiver methods
+
+std::unique_ptr<RequestChannelReceiver> RequestChannelReceiver::create(
+        const FmqRequestDescriptor& requestChannel, std::chrono::microseconds pollingTimeWindow) {
+    std::unique_ptr<FmqRequestChannel> fmqRequestChannel =
+            std::make_unique<FmqRequestChannel>(requestChannel);
+
+    if (!fmqRequestChannel->isValid()) {
+        LOG(ERROR) << "Unable to create RequestChannelReceiver";
+        return nullptr;
+    }
+    if (fmqRequestChannel->getEventFlagWord() == nullptr) {
+        LOG(ERROR)
+                << "RequestChannelReceiver::create was passed an MQDescriptor without an EventFlag";
+        return nullptr;
+    }
+
+    return std::make_unique<RequestChannelReceiver>(std::move(fmqRequestChannel),
+                                                    pollingTimeWindow);
+}
+
+RequestChannelReceiver::RequestChannelReceiver(std::unique_ptr<FmqRequestChannel> fmqRequestChannel,
+                                               std::chrono::microseconds pollingTimeWindow)
+    : mFmqRequestChannel(std::move(fmqRequestChannel)), kPollingTimeWindow(pollingTimeWindow) {}
+
+std::optional<std::tuple<V1_0::Request, std::vector<int32_t>, V1_2::MeasureTiming>>
+RequestChannelReceiver::getBlocking() {
+    const auto packet = getPacketBlocking();
+    if (!packet) {
+        return std::nullopt;
+    }
+
+    return deserialize(*packet);
+}
+
+void RequestChannelReceiver::invalidate() {
+    mTeardown = true;
+
+    // force unblock
+    // ExecutionBurstServer is by default waiting on a request packet. If the
+    // client process destroys its burst object, the server may still be waiting
+    // on the futex. This force unblock wakes up any thread waiting on the
+    // futex.
+    // TODO: look for a different/better way to signal/notify the futex to wake
+    // up any thread waiting on it
+    FmqRequestDatum datum;
+    datum.packetInformation({/*.packetSize=*/0, /*.numberOfInputOperands=*/0,
+                             /*.numberOfOutputOperands=*/0, /*.numberOfPools=*/0});
+    mFmqRequestChannel->writeBlocking(&datum, 1);
+}
+
+std::optional<std::vector<FmqRequestDatum>> RequestChannelReceiver::getPacketBlocking() {
+    if (mTeardown) {
+        return std::nullopt;
+    }
+
+    // First spend time polling if results are available in FMQ instead of
+    // waiting on the futex. Polling is more responsive (yielding lower
+    // latencies), but can take up more power, so only poll for a limited period
+    // of time.
+
+    auto& getCurrentTime = std::chrono::high_resolution_clock::now;
+    const auto timeToStopPolling = getCurrentTime() + kPollingTimeWindow;
+
+    while (getCurrentTime() < timeToStopPolling) {
+        // if class is being torn down, immediately return
+        if (mTeardown.load(std::memory_order_relaxed)) {
+            return std::nullopt;
+        }
+
+        // Check if data is available. If it is, immediately retrieve it and
+        // return.
+        const size_t available = mFmqRequestChannel->availableToRead();
+        if (available > 0) {
+            // This is the first point when we know an execution is occurring,
+            // so begin to collect systraces. Note that a similar systrace does
+            // not exist at the corresponding point in
+            // ResultChannelReceiver::getPacketBlocking because the execution is
+            // already in flight.
+            NNTRACE_FULL(NNTRACE_LAYER_IPC, NNTRACE_PHASE_EXECUTION,
+                         "ExecutionBurstServer getting packet");
+            std::vector<FmqRequestDatum> packet(available);
+            const bool success = mFmqRequestChannel->read(packet.data(), available);
+            if (!success) {
+                LOG(ERROR) << "Error receiving packet";
+                return std::nullopt;
+            }
+            return std::make_optional(std::move(packet));
+        }
+    }
+
+    // If we get to this point, we either stopped polling because it was taking
+    // too long or polling was not allowed. Instead, perform a blocking call
+    // which uses a futex to save power.
+
+    // wait for request packet and read first element of request packet
+    FmqRequestDatum datum;
+    bool success = mFmqRequestChannel->readBlocking(&datum, 1);
+
+    // This is the first point when we know an execution is occurring, so begin
+    // to collect systraces. Note that a similar systrace does not exist at the
+    // corresponding point in ResultChannelReceiver::getPacketBlocking because
+    // the execution is already in flight.
+    NNTRACE_FULL(NNTRACE_LAYER_IPC, NNTRACE_PHASE_EXECUTION, "ExecutionBurstServer getting packet");
+
+    // retrieve remaining elements
+    // NOTE: all of the data is already available at this point, so there's no
+    // need to do a blocking wait to wait for more data. This is known because
+    // in FMQ, all writes are published (made available) atomically. Currently,
+    // the producer always publishes the entire packet in one function call, so
+    // if the first element of the packet is available, the remaining elements
+    // are also available.
+    const size_t count = mFmqRequestChannel->availableToRead();
+    std::vector<FmqRequestDatum> packet(count + 1);
+    std::memcpy(&packet.front(), &datum, sizeof(datum));
+    success &= mFmqRequestChannel->read(packet.data() + 1, count);
+
+    // terminate loop
+    if (mTeardown) {
+        return std::nullopt;
+    }
+
+    // ensure packet was successfully received
+    if (!success) {
+        LOG(ERROR) << "Error receiving packet";
+        return std::nullopt;
+    }
+
+    return std::make_optional(std::move(packet));
+}
+
+// ResultChannelSender methods
+
+std::unique_ptr<ResultChannelSender> ResultChannelSender::create(
+        const FmqResultDescriptor& resultChannel) {
+    std::unique_ptr<FmqResultChannel> fmqResultChannel =
+            std::make_unique<FmqResultChannel>(resultChannel);
+
+    if (!fmqResultChannel->isValid()) {
+        LOG(ERROR) << "Unable to create RequestChannelSender";
+        return nullptr;
+    }
+    if (fmqResultChannel->getEventFlagWord() == nullptr) {
+        LOG(ERROR) << "ResultChannelSender::create was passed an MQDescriptor without an EventFlag";
+        return nullptr;
+    }
+
+    return std::make_unique<ResultChannelSender>(std::move(fmqResultChannel));
+}
+
+ResultChannelSender::ResultChannelSender(std::unique_ptr<FmqResultChannel> fmqResultChannel)
+    : mFmqResultChannel(std::move(fmqResultChannel)) {}
+
+bool ResultChannelSender::send(V1_0::ErrorStatus errorStatus,
+                               const std::vector<V1_2::OutputShape>& outputShapes,
+                               V1_2::Timing timing) {
+    const std::vector<FmqResultDatum> serialized = serialize(errorStatus, outputShapes, timing);
+    return sendPacket(serialized);
+}
+
+bool ResultChannelSender::sendPacket(const std::vector<FmqResultDatum>& packet) {
+    if (packet.size() > mFmqResultChannel->availableToWrite()) {
+        LOG(ERROR)
+                << "ResultChannelSender::sendPacket -- packet size exceeds size available in FMQ";
+        const std::vector<FmqResultDatum> errorPacket =
+                serialize(V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming);
+
+        // Always send the packet with "blocking" because this signals the futex
+        // and unblocks the consumer if it is waiting on the futex.
+        return mFmqResultChannel->writeBlocking(errorPacket.data(), errorPacket.size());
+    }
+
+    // Always send the packet with "blocking" because this signals the futex and
+    // unblocks the consumer if it is waiting on the futex.
+    return mFmqResultChannel->writeBlocking(packet.data(), packet.size());
+}
+
+// ResultChannelReceiver methods
+
+std::pair<std::unique_ptr<ResultChannelReceiver>, const FmqResultDescriptor*>
+ResultChannelReceiver::create(size_t channelLength, std::chrono::microseconds pollingTimeWindow) {
+    std::unique_ptr<FmqResultChannel> fmqResultChannel =
+            std::make_unique<FmqResultChannel>(channelLength, /*confEventFlag=*/true);
+    if (!fmqResultChannel->isValid()) {
+        LOG(ERROR) << "Unable to create ResultChannelReceiver";
+        return {nullptr, nullptr};
+    }
+
+    const FmqResultDescriptor* descriptor = fmqResultChannel->getDesc();
+    return std::make_pair(
+            std::make_unique<ResultChannelReceiver>(std::move(fmqResultChannel), pollingTimeWindow),
+            descriptor);
+}
+
+ResultChannelReceiver::ResultChannelReceiver(std::unique_ptr<FmqResultChannel> fmqResultChannel,
+                                             std::chrono::microseconds pollingTimeWindow)
+    : mFmqResultChannel(std::move(fmqResultChannel)), kPollingTimeWindow(pollingTimeWindow) {}
+
+std::optional<std::tuple<V1_0::ErrorStatus, std::vector<V1_2::OutputShape>, V1_2::Timing>>
+ResultChannelReceiver::getBlocking() {
+    const auto packet = getPacketBlocking();
+    if (!packet) {
+        return std::nullopt;
+    }
+
+    return deserialize(*packet);
+}
+
+void ResultChannelReceiver::invalidate() {
+    mValid = false;
+
+    // force unblock
+    // ExecutionBurstController waits on a result packet after sending a
+    // request. If the driver containing ExecutionBurstServer crashes, the
+    // controller may be waiting on the futex. This force unblock wakes up any
+    // thread waiting on the futex.
+    // TODO: look for a different/better way to signal/notify the futex to
+    // wake up any thread waiting on it
+    FmqResultDatum datum;
+    datum.packetInformation({/*.packetSize=*/0,
+                             /*.errorStatus=*/V1_0::ErrorStatus::GENERAL_FAILURE,
+                             /*.numberOfOperands=*/0});
+    mFmqResultChannel->writeBlocking(&datum, 1);
+}
+
+std::optional<std::vector<FmqResultDatum>> ResultChannelReceiver::getPacketBlocking() {
+    if (!mValid) {
+        return std::nullopt;
+    }
+
+    // First spend time polling if results are available in FMQ instead of
+    // waiting on the futex. Polling is more responsive (yielding lower
+    // latencies), but can take up more power, so only poll for a limited period
+    // of time.
+
+    auto& getCurrentTime = std::chrono::high_resolution_clock::now;
+    const auto timeToStopPolling = getCurrentTime() + kPollingTimeWindow;
+
+    while (getCurrentTime() < timeToStopPolling) {
+        // if class is being torn down, immediately return
+        if (!mValid.load(std::memory_order_relaxed)) {
+            return std::nullopt;
+        }
+
+        // Check if data is available. If it is, immediately retrieve it and
+        // return.
+        const size_t available = mFmqResultChannel->availableToRead();
+        if (available > 0) {
+            std::vector<FmqResultDatum> packet(available);
+            const bool success = mFmqResultChannel->read(packet.data(), available);
+            if (!success) {
+                LOG(ERROR) << "Error receiving packet";
+                return std::nullopt;
+            }
+            return std::make_optional(std::move(packet));
+        }
+    }
+
+    // If we get to this point, we either stopped polling because it was taking
+    // too long or polling was not allowed. Instead, perform a blocking call
+    // which uses a futex to save power.
+
+    // wait for result packet and read first element of result packet
+    FmqResultDatum datum;
+    bool success = mFmqResultChannel->readBlocking(&datum, 1);
+
+    // retrieve remaining elements
+    // NOTE: all of the data is already available at this point, so there's no
+    // need to do a blocking wait to wait for more data. This is known because
+    // in FMQ, all writes are published (made available) atomically. Currently,
+    // the producer always publishes the entire packet in one function call, so
+    // if the first element of the packet is available, the remaining elements
+    // are also available.
+    const size_t count = mFmqResultChannel->availableToRead();
+    std::vector<FmqResultDatum> packet(count + 1);
+    std::memcpy(&packet.front(), &datum, sizeof(datum));
+    success &= mFmqResultChannel->read(packet.data() + 1, count);
+
+    if (!mValid) {
+        return std::nullopt;
+    }
+
+    // ensure packet was successfully received
+    if (!success) {
+        LOG(ERROR) << "Error receiving packet";
+        return std::nullopt;
+    }
+
+    return std::make_optional(std::move(packet));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.2/utils/src/PreparedModel.cpp b/neuralnetworks/1.2/utils/src/PreparedModel.cpp
index 6d00082..6841c5e 100644
--- a/neuralnetworks/1.2/utils/src/PreparedModel.cpp
+++ b/neuralnetworks/1.2/utils/src/PreparedModel.cpp
@@ -27,6 +27,7 @@
 #include <nnapi/IPreparedModel.h>
 #include <nnapi/Result.h>
 #include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Burst.h>
 #include <nnapi/hal/1.0/Conversions.h>
 #include <nnapi/hal/CommonUtils.h>
 #include <nnapi/hal/HandleError.h>
@@ -117,6 +118,10 @@
            << "IPreparedModel::executeFenced is not supported on 1.2 HAL service";
 }
 
+nn::GeneralResult<nn::SharedBurst> PreparedModel::configureExecutionBurst() const {
+    return V1_0::utils::Burst::create(shared_from_this());
+}
+
 std::any PreparedModel::getUnderlyingResource() const {
     sp<V1_2::IPreparedModel> resource = kPreparedModel;
     return resource;
diff --git a/neuralnetworks/1.2/utils/test/DeviceTest.cpp b/neuralnetworks/1.2/utils/test/DeviceTest.cpp
new file mode 100644
index 0000000..9c8adde
--- /dev/null
+++ b/neuralnetworks/1.2/utils/test/DeviceTest.cpp
@@ -0,0 +1,875 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockDevice.h"
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.2/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.2/Device.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const nn::Model kSimpleModel = {
+        .main = {.operands = {{.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_INPUT},
+                              {.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_OUTPUT}},
+                 .operations = {{.type = nn::OperationType::RELU, .inputs = {0}, .outputs = {1}}},
+                 .inputIndexes = {0},
+                 .outputIndexes = {1}}};
+
+const std::string kName = "Google-MockV1";
+const std::string kInvalidName = "";
+const sp<V1_2::IDevice> kInvalidDevice;
+constexpr V1_0::PerformanceInfo kNoPerformanceInfo = {
+        .execTime = std::numeric_limits<float>::max(),
+        .powerUsage = std::numeric_limits<float>::max()};
+
+template <typename... Args>
+auto makeCallbackReturn(Args&&... args) {
+    return [argPack = std::make_tuple(std::forward<Args>(args)...)](const auto& cb) {
+        std::apply(cb, argPack);
+        return Void();
+    };
+}
+
+sp<MockDevice> createMockDevice() {
+    const auto mockDevice = MockDevice::create();
+
+    // Setup default actions for each relevant call.
+    const auto getVersionString_ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, kName);
+    const auto getType_ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, V1_2::DeviceType::OTHER);
+    const auto getSupportedExtensions_ret =
+            makeCallbackReturn(V1_0::ErrorStatus::NONE, hidl_vec<V1_2::Extension>{});
+    const auto getNumberOfCacheFilesNeeded_ret = makeCallbackReturn(
+            V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles, nn::kMaxNumberOfCacheFiles);
+    const auto getCapabilities_ret = makeCallbackReturn(
+            V1_0::ErrorStatus::NONE,
+            V1_2::Capabilities{
+                    .relaxedFloat32toFloat16PerformanceScalar = kNoPerformanceInfo,
+                    .relaxedFloat32toFloat16PerformanceTensor = kNoPerformanceInfo,
+            });
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, getVersionString(_)).WillByDefault(Invoke(getVersionString_ret));
+    ON_CALL(*mockDevice, getType(_)).WillByDefault(Invoke(getType_ret));
+    ON_CALL(*mockDevice, getSupportedExtensions(_))
+            .WillByDefault(Invoke(getSupportedExtensions_ret));
+    ON_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .WillByDefault(Invoke(getNumberOfCacheFilesNeeded_ret));
+    ON_CALL(*mockDevice, getCapabilities_1_2(_)).WillByDefault(Invoke(getCapabilities_ret));
+
+    // Ensure that older calls are not used.
+    EXPECT_CALL(*mockDevice, getCapabilities(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _)).Times(0);
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getType(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_)).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+auto makePreparedModelReturn(V1_0::ErrorStatus launchStatus, V1_0::ErrorStatus returnStatus,
+                             const sp<MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](
+                   const V1_2::Model& /*model*/, V1_1::ExecutionPreference /*preference*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*modelCache*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*dataCache*/,
+                   const CacheToken& /*token*/, const sp<V1_2::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_0::ErrorStatus> {
+        cb->notify_1_2(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+auto makePreparedModelFromCacheReturn(V1_0::ErrorStatus launchStatus,
+                                      V1_0::ErrorStatus returnStatus,
+                                      const sp<MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*modelCache*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*dataCache*/,
+                   const CacheToken& /*token*/, const sp<V1_2::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_0::ErrorStatus> {
+        cb->notify_1_2(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(DeviceTest, invalidName) {
+    // run test
+    const auto device = MockDevice::create();
+    const auto result = Device::create(kInvalidName, device);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, invalidDevice) {
+    // run test
+    const auto result = Device::create(kName, kInvalidDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, getVersionStringError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, "");
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getVersionStringTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getVersionStringDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getTypeError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret =
+            makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, V1_2::DeviceType::OTHER);
+    EXPECT_CALL(*mockDevice, getType(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getTypeTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getType(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getTypeDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getType(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedExtensionsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret =
+            makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, hidl_vec<V1_2::Extension>{});
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedExtensionsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedExtensionsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                        nn::kMaxNumberOfCacheFiles, nn::kMaxNumberOfCacheFiles);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, dataCacheFilesExceedsSpecifiedMax) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles + 1,
+                                        nn::kMaxNumberOfCacheFiles);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, modelCacheFilesExceedsSpecifiedMax) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles,
+                                        nn::kMaxNumberOfCacheFiles + 1);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getCapabilitiesError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(
+            V1_0::ErrorStatus::GENERAL_FAILURE,
+            V1_2::Capabilities{
+                    .relaxedFloat32toFloat16PerformanceScalar = kNoPerformanceInfo,
+                    .relaxedFloat32toFloat16PerformanceTensor = kNoPerformanceInfo,
+            });
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, linkToDeathError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getName) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto& name = device->getName();
+
+    // verify result
+    EXPECT_EQ(name, kName);
+}
+
+TEST(DeviceTest, getFeatureLevel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto featureLevel = device->getFeatureLevel();
+
+    // verify result
+    EXPECT_EQ(featureLevel, nn::Version::ANDROID_Q);
+}
+
+TEST(DeviceTest, getCachedData) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getType(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_)).Times(1);
+
+    const auto result = Device::create(kName, mockDevice);
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& device = result.value();
+
+    // run test and verify results
+    EXPECT_EQ(device->getVersionString(), device->getVersionString());
+    EXPECT_EQ(device->getType(), device->getType());
+    EXPECT_EQ(device->getSupportedExtensions(), device->getSupportedExtensions());
+    EXPECT_EQ(device->getNumberOfCacheFilesNeeded(), device->getNumberOfCacheFilesNeeded());
+    EXPECT_EQ(device->getCapabilities(), device->getCapabilities());
+}
+
+TEST(DeviceTest, wait) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<void> { return {}; };
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(DeviceTest, waitTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, waitDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedOperations) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& model, const auto& cb) {
+        cb(V1_0::ErrorStatus::NONE, std::vector<bool>(model.operations.size(), true));
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_2(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& supportedOperations = result.value();
+    EXPECT_EQ(supportedOperations.size(), kSimpleModel.main.operations.size());
+    EXPECT_THAT(supportedOperations, Each(testing::IsTrue()));
+}
+
+TEST(DeviceTest, getSupportedOperationsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& /*model*/, const auto& cb) {
+        cb(V1_0::ErrorStatus::GENERAL_FAILURE, {});
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_2(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_2(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_2(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelLaunchError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelReturnError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_0::ErrorStatus::NONE,
+                                                     V1_0::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCache) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(
+                    V1_0::ErrorStatus::NONE, V1_0::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelFromCacheError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                              V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                              nullptr)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(V1_0::ErrorStatus::NONE,
+                                                              V1_0::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCacheAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, allocateNotSupported) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.2/utils/test/MockDevice.h b/neuralnetworks/1.2/utils/test/MockDevice.h
new file mode 100644
index 0000000..b459943
--- /dev/null
+++ b/neuralnetworks/1.2/utils/test/MockDevice.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_DEVICE
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_DEVICE
+
+#include <android/hardware/neuralnetworks/1.2/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+using CacheToken =
+        hidl_array<uint8_t, static_cast<uint32_t>(V1_2::Constant::BYTE_SIZE_OF_CACHE_TOKEN)>;
+
+class MockDevice final : public IDevice {
+  public:
+    static sp<MockDevice> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient, uint64_t /*cookie*/);
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities, (getCapabilities_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations,
+                (const V1_0::Model& model, getSupportedOperations_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel,
+                (const V1_0::Model& model, const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::DeviceStatus>, getStatus, (), (override));
+
+    // V1_1 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities_1_1, (getCapabilities_1_1_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_1,
+                (const V1_1::Model& model, getSupportedOperations_1_1_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel_1_1,
+                (const V1_1::Model& model, V1_1::ExecutionPreference preference,
+                 const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+
+    // V1_2 methods below.
+    MOCK_METHOD(Return<void>, getVersionString, (getVersionString_cb cb), (override));
+    MOCK_METHOD(Return<void>, getType, (getType_cb cb), (override));
+    MOCK_METHOD(Return<void>, getCapabilities_1_2, (getCapabilities_1_2_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedExtensions, (getSupportedExtensions_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_2,
+                (const V1_2::Model& model, getSupportedOperations_1_2_cb cb), (override));
+    MOCK_METHOD(Return<void>, getNumberOfCacheFilesNeeded, (getNumberOfCacheFilesNeeded_cb cb),
+                (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel_1_2,
+                (const V1_2::Model& model, V1_1::ExecutionPreference preference,
+                 const hidl_vec<hidl_handle>& modelCache, const hidl_vec<hidl_handle>& dataCache,
+                 const CacheToken& token, const sp<V1_2::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModelFromCache,
+                (const hidl_vec<hidl_handle>& modelCache, const hidl_vec<hidl_handle>& dataCache,
+                 const CacheToken& token, const sp<V1_2::IPreparedModelCallback>& callback),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockDevice> MockDevice::create() {
+    auto mockDevice = sp<MockDevice>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+inline Return<bool> MockDevice::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                            uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockDevice::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::Device will not use the `cookie` or `who` arguments, so we pass in 0
+    // and nullptr for these arguments instead. Normally, they are used by the hidl_death_recipient
+    // to determine which object is dead. However, the utils::Device code only pairs a single death
+    // recipient with a single HIDL interface object, so these arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_DEVICE
diff --git a/neuralnetworks/1.2/utils/test/MockPreparedModel.h b/neuralnetworks/1.2/utils/test/MockPreparedModel.h
new file mode 100644
index 0000000..f5fd1f3
--- /dev/null
+++ b/neuralnetworks/1.2/utils/test/MockPreparedModel.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_PREPARED_MODEL
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_PREPARED_MODEL
+
+#include <android/hardware/neuralnetworks/1.2/IPreparedModel.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/HidlSupport.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+class MockPreparedModel final : public IPreparedModel {
+  public:
+    static sp<MockPreparedModel> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient,
+                             uint64_t /*cookie*/) override;
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute,
+                (const V1_0::Request& request, const sp<V1_0::IExecutionCallback>& callback),
+                (override));
+
+    // V1_2 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute_1_2,
+                (const V1_0::Request& request, V1_2::MeasureTiming measure,
+                 const sp<V1_2::IExecutionCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<void>, executeSynchronously,
+                (const V1_0::Request& request, V1_2::MeasureTiming measure,
+                 executeSynchronously_cb cb),
+                (override));
+    MOCK_METHOD(Return<void>, configureExecutionBurst,
+                (const sp<V1_2::IBurstCallback>& callback,
+                 const MQDescriptorSync<V1_2::FmqRequestDatum>& requestChannel,
+                 const MQDescriptorSync<V1_2::FmqResultDatum>& resultChannel,
+                 configureExecutionBurst_cb cb),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockPreparedModel> MockPreparedModel::create() {
+    auto mockPreparedModel = sp<MockPreparedModel>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockPreparedModel, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockPreparedModel;
+}
+
+inline Return<bool> MockPreparedModel::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                                   uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockPreparedModel::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::PreparedModel will not use the `cookie` or `who` arguments, so we pass
+    // in 0 and nullptr for these arguments instead. Normally, they are used by the
+    // hidl_death_recipient to determine which object is dead. However, the utils::PreparedModel
+    // code only pairs a single death recipient with a single HIDL interface object, so these
+    // arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_TEST_MOCK_PREPARED_MODEL
diff --git a/neuralnetworks/1.2/utils/test/PreparedModelTest.cpp b/neuralnetworks/1.2/utils/test/PreparedModelTest.cpp
new file mode 100644
index 0000000..5062ac9
--- /dev/null
+++ b/neuralnetworks/1.2/utils/test/PreparedModelTest.cpp
@@ -0,0 +1,341 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.2/IExecutionCallback.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.2/PreparedModel.h>
+
+#include <functional>
+#include <memory>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const sp<V1_2::IPreparedModel> kInvalidPreparedModel;
+constexpr auto kNoTiming = V1_2::Timing{.timeOnDevice = std::numeric_limits<uint64_t>::max(),
+                                        .timeInDriver = std::numeric_limits<uint64_t>::max()};
+
+sp<MockPreparedModel> createMockPreparedModel() {
+    const auto mockPreparedModel = MockPreparedModel::create();
+
+    // Ensure that older calls are not used.
+    EXPECT_CALL(*mockPreparedModel, execute(_, _)).Times(0);
+
+    return mockPreparedModel;
+}
+
+auto makeExecuteSynchronously(V1_0::ErrorStatus status,
+                              const std::vector<V1_2::OutputShape>& outputShapes,
+                              const V1_2::Timing& timing) {
+    return [status, outputShapes, timing](const V1_0::Request& /*request*/,
+                                          V1_2::MeasureTiming /*measureTiming*/,
+                                          const V1_2::IPreparedModel::executeSynchronously_cb& cb) {
+        cb(status, outputShapes, timing);
+        return hardware::Void();
+    };
+}
+auto makeExecuteAsynchronously(V1_0::ErrorStatus launchStatus, V1_0::ErrorStatus returnStatus,
+                               const std::vector<V1_2::OutputShape>& outputShapes,
+                               const V1_2::Timing& timing) {
+    return [launchStatus, returnStatus, outputShapes, timing](
+                   const V1_0::Request& /*request*/, V1_2::MeasureTiming /*measureTiming*/,
+                   const sp<V1_2::IExecutionCallback>& cb) -> Return<V1_0::ErrorStatus> {
+        cb->notify_1_2(returnStatus, outputShapes, timing);
+        return launchStatus;
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(PreparedModelTest, invalidPreparedModel) {
+    // run test
+    const auto result = PreparedModel::create(kInvalidPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathError) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeSync) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteSynchronously(V1_0::ErrorStatus::NONE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(PreparedModelTest, executeSyncError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(
+                    makeExecuteSynchronously(V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeSyncTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeSyncDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeAsync) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(V1_0::ErrorStatus::NONE,
+                                                       V1_0::ErrorStatus::NONE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(PreparedModelTest, executeAsyncLaunchError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                                       V1_0::ErrorStatus::GENERAL_FAILURE, {},
+                                                       kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncReturnError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(
+                    V1_0::ErrorStatus::NONE, V1_0::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeAsyncCrash) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    const auto ret = [&mockPreparedModel]() -> hardware::Return<V1_0::ErrorStatus> {
+        mockPreparedModel->simulateCrash();
+        return V1_0::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _)).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeFencedNotSupported) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+// TODO: test burst execution if/when it is added to nn::IPreparedModel.
+
+TEST(PreparedModelTest, getUnderlyingResource) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+
+    // run test
+    const auto resource = preparedModel->getUnderlyingResource();
+
+    // verify resource
+    const sp<V1_2::IPreparedModel>* maybeMock = std::any_cast<sp<V1_2::IPreparedModel>>(&resource);
+    ASSERT_NE(maybeMock, nullptr);
+    EXPECT_EQ(maybeMock->get(), mockPreparedModel.get());
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.3/utils/Android.bp b/neuralnetworks/1.3/utils/Android.bp
index d5d897d..41d9521 100644
--- a/neuralnetworks/1.3/utils/Android.bp
+++ b/neuralnetworks/1.3/utils/Android.bp
@@ -38,3 +38,35 @@
         "neuralnetworks_utils_hal_common",
     ],
 }
+
+cc_test {
+    name: "neuralnetworks_utils_hal_1_3_test",
+    srcs: ["test/*.cpp"],
+    static_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "android.hardware.neuralnetworks@1.1",
+        "android.hardware.neuralnetworks@1.2",
+        "android.hardware.neuralnetworks@1.3",
+        "libgmock",
+        "libneuralnetworks_common",
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_common",
+        "neuralnetworks_utils_hal_1_0",
+        "neuralnetworks_utils_hal_1_1",
+        "neuralnetworks_utils_hal_1_2",
+        "neuralnetworks_utils_hal_1_3",
+    ],
+    shared_libs: [
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "libhidlmemory",
+        "liblog",
+        "libnativewindow",
+        "libutils",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h
index 84f606a..f36b6c0 100644
--- a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h
@@ -54,6 +54,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h
index 664d87a..690fecc 100644
--- a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h
@@ -35,7 +35,8 @@
 namespace android::hardware::neuralnetworks::V1_3::utils {
 
 // Class that adapts V1_3::IPreparedModel to nn::IPreparedModel.
-class PreparedModel final : public nn::IPreparedModel {
+class PreparedModel final : public nn::IPreparedModel,
+                            public std::enable_shared_from_this<PreparedModel> {
     struct PrivateConstructorTag {};
 
   public:
@@ -56,6 +57,8 @@
             const nn::OptionalDuration& loopTimeoutDuration,
             const nn::OptionalDuration& timeoutDurationAfterFence) const override;
 
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurst() const override;
+
     std::any getUnderlyingResource() const override;
 
   private:
diff --git a/neuralnetworks/1.3/utils/src/Device.cpp b/neuralnetworks/1.3/utils/src/Device.cpp
index d710b85..87c9f32 100644
--- a/neuralnetworks/1.3/utils/src/Device.cpp
+++ b/neuralnetworks/1.3/utils/src/Device.cpp
@@ -150,6 +150,10 @@
     return kDeviceType;
 }
 
+bool Device::isUpdatable() const {
+    return false;
+}
+
 const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
     return kExtensions;
 }
diff --git a/neuralnetworks/1.3/utils/src/PreparedModel.cpp b/neuralnetworks/1.3/utils/src/PreparedModel.cpp
index 7b4b7ba..725e4f5 100644
--- a/neuralnetworks/1.3/utils/src/PreparedModel.cpp
+++ b/neuralnetworks/1.3/utils/src/PreparedModel.cpp
@@ -29,6 +29,7 @@
 #include <nnapi/Result.h>
 #include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Burst.h>
 #include <nnapi/hal/1.2/Conversions.h>
 #include <nnapi/hal/CommonUtils.h>
 #include <nnapi/hal/HandleError.h>
@@ -197,6 +198,10 @@
     return std::make_pair(std::move(syncFence), std::move(callback));
 }
 
+nn::GeneralResult<nn::SharedBurst> PreparedModel::configureExecutionBurst() const {
+    return V1_0::utils::Burst::create(shared_from_this());
+}
+
 std::any PreparedModel::getUnderlyingResource() const {
     sp<V1_3::IPreparedModel> resource = kPreparedModel;
     return resource;
diff --git a/neuralnetworks/1.3/utils/test/BufferTest.cpp b/neuralnetworks/1.3/utils/test/BufferTest.cpp
new file mode 100644
index 0000000..d892b87
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/BufferTest.cpp
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockBuffer.h"
+
+#include <android/hardware/neuralnetworks/1.3/IBuffer.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/SharedMemory.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.3/Buffer.h>
+
+#include <functional>
+#include <memory>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+using ::testing::Return;
+
+const auto kMemory = nn::createSharedMemory(4).value();
+const sp<V1_3::IBuffer> kInvalidBuffer;
+constexpr auto kInvalidToken = nn::Request::MemoryDomainToken{0};
+constexpr auto kToken = nn::Request::MemoryDomainToken{1};
+
+std::function<hardware::Return<V1_3::ErrorStatus>()> makeFunctionReturn(V1_3::ErrorStatus status) {
+    return [status]() -> hardware::Return<V1_3::ErrorStatus> { return status; };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeSuccessful = makeFunctionReturn(V1_3::ErrorStatus::NONE);
+const auto makeGeneralError = makeFunctionReturn(V1_3::ErrorStatus::GENERAL_FAILURE);
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(BufferTest, invalidBuffer) {
+    // run test
+    const auto result = Buffer::create(kInvalidBuffer, kToken);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, invalidToken) {
+    // setup call
+    const auto mockBuffer = MockBuffer::create();
+
+    // run test
+    const auto result = Buffer::create(mockBuffer, kInvalidToken);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, create) {
+    // setup call
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+
+    // run test
+    const auto token = buffer->getToken();
+
+    // verify result
+    EXPECT_EQ(token, kToken);
+}
+
+TEST(BufferTest, copyTo) {
+    // setup call
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(InvokeWithoutArgs(makeSuccessful));
+
+    // run test
+    const auto result = buffer->copyTo(kMemory);
+
+    // verify result
+    EXPECT_TRUE(result.has_value()) << result.error().message;
+}
+
+TEST(BufferTest, copyToError) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(InvokeWithoutArgs(makeGeneralError));
+
+    // run test
+    const auto result = buffer->copyTo(kMemory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, copyToTransportFailure) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyTo(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = buffer->copyTo(kMemory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, copyToDeadObject) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = buffer->copyTo(kMemory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(BufferTest, copyFrom) {
+    // setup call
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(InvokeWithoutArgs(makeSuccessful));
+
+    // run test
+    const auto result = buffer->copyFrom(kMemory, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value());
+}
+
+TEST(BufferTest, copyFromError) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(InvokeWithoutArgs(makeGeneralError));
+
+    // run test
+    const auto result = buffer->copyFrom(kMemory, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, copyFromTransportFailure) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = buffer->copyFrom(kMemory, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(BufferTest, copyFromDeadObject) {
+    // setup test
+    const auto mockBuffer = MockBuffer::create();
+    const auto buffer = Buffer::create(mockBuffer, kToken).value();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = buffer->copyFrom(kMemory, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/test/DeviceTest.cpp b/neuralnetworks/1.3/utils/test/DeviceTest.cpp
new file mode 100644
index 0000000..f260990
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/DeviceTest.cpp
@@ -0,0 +1,951 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockBuffer.h"
+#include "MockDevice.h"
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.3/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.3/Device.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const nn::Model kSimpleModel = {
+        .main = {.operands = {{.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_INPUT},
+                              {.type = nn::OperandType::TENSOR_FLOAT32,
+                               .dimensions = {1},
+                               .lifetime = nn::Operand::LifeTime::SUBGRAPH_OUTPUT}},
+                 .operations = {{.type = nn::OperationType::RELU, .inputs = {0}, .outputs = {1}}},
+                 .inputIndexes = {0},
+                 .outputIndexes = {1}}};
+
+const std::string kName = "Google-MockV1";
+const std::string kInvalidName = "";
+const sp<V1_3::IDevice> kInvalidDevice;
+constexpr V1_0::PerformanceInfo kNoPerformanceInfo = {
+        .execTime = std::numeric_limits<float>::max(),
+        .powerUsage = std::numeric_limits<float>::max()};
+
+template <typename... Args>
+auto makeCallbackReturn(Args&&... args) {
+    return [argPack = std::make_tuple(std::forward<Args>(args)...)](const auto& cb) {
+        std::apply(cb, argPack);
+        return Void();
+    };
+}
+
+sp<MockDevice> createMockDevice() {
+    const auto mockDevice = MockDevice::create();
+
+    // Setup default actions for each relevant call.
+    const auto getVersionString_ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, kName);
+    const auto getType_ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, V1_2::DeviceType::OTHER);
+    const auto getSupportedExtensions_ret =
+            makeCallbackReturn(V1_0::ErrorStatus::NONE, hidl_vec<V1_2::Extension>{});
+    const auto getNumberOfCacheFilesNeeded_ret = makeCallbackReturn(
+            V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles, nn::kMaxNumberOfCacheFiles);
+    const auto getCapabilities_ret = makeCallbackReturn(
+            V1_3::ErrorStatus::NONE,
+            V1_3::Capabilities{
+                    .relaxedFloat32toFloat16PerformanceScalar = kNoPerformanceInfo,
+                    .relaxedFloat32toFloat16PerformanceTensor = kNoPerformanceInfo,
+                    .ifPerformance = kNoPerformanceInfo,
+                    .whilePerformance = kNoPerformanceInfo,
+            });
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, getVersionString(_)).WillByDefault(Invoke(getVersionString_ret));
+    ON_CALL(*mockDevice, getType(_)).WillByDefault(Invoke(getType_ret));
+    ON_CALL(*mockDevice, getSupportedExtensions(_))
+            .WillByDefault(Invoke(getSupportedExtensions_ret));
+    ON_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .WillByDefault(Invoke(getNumberOfCacheFilesNeeded_ret));
+    ON_CALL(*mockDevice, getCapabilities_1_3(_)).WillByDefault(Invoke(getCapabilities_ret));
+
+    // Ensure that older calls are not used.
+    EXPECT_CALL(*mockDevice, getCapabilities(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getCapabilities_1_1(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getCapabilities_1_2(_)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_1(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel_1_1(_, _, _)).Times(0);
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_2(_, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModel_1_2(_, _, _, _, _, _)).Times(0);
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _)).Times(0);
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getType(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getCapabilities_1_3(_)).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+auto makePreparedModelReturn(V1_3::ErrorStatus launchStatus, V1_3::ErrorStatus returnStatus,
+                             const sp<MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](
+                   const V1_3::Model& /*model*/, V1_1::ExecutionPreference /*preference*/,
+                   V1_3::Priority /*priority*/, const V1_3::OptionalTimePoint& /*deadline*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*modelCache*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*dataCache*/,
+                   const CacheToken& /*token*/, const sp<V1_3::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_3::ErrorStatus> {
+        cb->notify_1_3(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+auto makePreparedModelFromCacheReturn(V1_3::ErrorStatus launchStatus,
+                                      V1_3::ErrorStatus returnStatus,
+                                      const sp<MockPreparedModel>& preparedModel) {
+    return [launchStatus, returnStatus, preparedModel](
+                   const V1_3::OptionalTimePoint& /*deadline*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*modelCache*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*dataCache*/,
+                   const CacheToken& /*token*/, const sp<V1_3::IPreparedModelCallback>& cb)
+                   -> hardware::Return<V1_3::ErrorStatus> {
+        cb->notify_1_3(returnStatus, preparedModel).isOk();
+        return launchStatus;
+    };
+}
+auto makeAllocateReturn(ErrorStatus status, const sp<MockBuffer>& buffer, uint32_t token) {
+    return [status, buffer, token](
+                   const V1_3::BufferDesc& /*desc*/,
+                   const hardware::hidl_vec<sp<V1_3::IPreparedModel>>& /*preparedModels*/,
+                   const hardware::hidl_vec<V1_3::BufferRole>& /*inputRoles*/,
+                   const hardware::hidl_vec<V1_3::BufferRole>& /*outputRoles*/,
+                   const V1_3::IDevice::allocate_cb& cb) -> hardware::Return<void> {
+        cb(status, buffer, token);
+        return hardware::Void();
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(DeviceTest, invalidName) {
+    // run test
+    const auto device = MockDevice::create();
+    const auto result = Device::create(kInvalidName, device);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, invalidDevice) {
+    // run test
+    const auto result = Device::create(kName, kInvalidDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(DeviceTest, getVersionStringError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, "");
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getVersionStringTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getVersionStringDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getTypeError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret =
+            makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, V1_2::DeviceType::OTHER);
+    EXPECT_CALL(*mockDevice, getType(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getTypeTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getType(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getTypeDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getType(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedExtensionsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret =
+            makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE, hidl_vec<V1_2::Extension>{});
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedExtensionsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedExtensionsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::GENERAL_FAILURE,
+                                        nn::kMaxNumberOfCacheFiles, nn::kMaxNumberOfCacheFiles);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, dataCacheFilesExceedsSpecifiedMax) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles + 1,
+                                        nn::kMaxNumberOfCacheFiles);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, modelCacheFilesExceedsSpecifiedMax) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(V1_0::ErrorStatus::NONE, nn::kMaxNumberOfCacheFiles,
+                                        nn::kMaxNumberOfCacheFiles + 1);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getNumberOfCacheFilesNeededDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getCapabilitiesError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = makeCallbackReturn(
+            V1_3::ErrorStatus::GENERAL_FAILURE,
+            V1_3::Capabilities{
+                    .relaxedFloat32toFloat16PerformanceScalar = kNoPerformanceInfo,
+                    .relaxedFloat32toFloat16PerformanceTensor = kNoPerformanceInfo,
+                    .ifPerformance = kNoPerformanceInfo,
+                    .whilePerformance = kNoPerformanceInfo,
+            });
+    EXPECT_CALL(*mockDevice, getCapabilities_1_3(_)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_3(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getCapabilitiesDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getCapabilities_1_3(_))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, linkToDeathError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = Device::create(kName, mockDevice);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getName) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto& name = device->getName();
+
+    // verify result
+    EXPECT_EQ(name, kName);
+}
+
+TEST(DeviceTest, getFeatureLevel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto featureLevel = device->getFeatureLevel();
+
+    // verify result
+    EXPECT_EQ(featureLevel, nn::Version::ANDROID_R);
+}
+
+TEST(DeviceTest, getCachedData) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, getVersionString(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getType(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getSupportedExtensions(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded(_)).Times(1);
+    EXPECT_CALL(*mockDevice, getCapabilities_1_3(_)).Times(1);
+
+    const auto result = Device::create(kName, mockDevice);
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& device = result.value();
+
+    // run test and verify results
+    EXPECT_EQ(device->getVersionString(), device->getVersionString());
+    EXPECT_EQ(device->getType(), device->getType());
+    EXPECT_EQ(device->getSupportedExtensions(), device->getSupportedExtensions());
+    EXPECT_EQ(device->getNumberOfCacheFilesNeeded(), device->getNumberOfCacheFilesNeeded());
+    EXPECT_EQ(device->getCapabilities(), device->getCapabilities());
+}
+
+TEST(DeviceTest, wait) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto ret = []() -> Return<void> { return {}; };
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(DeviceTest, waitTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, waitDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    EXPECT_CALL(*mockDevice, ping()).Times(1).WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+    const auto device = Device::create(kName, mockDevice).value();
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, getSupportedOperations) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& model, const auto& cb) {
+        cb(V1_3::ErrorStatus::NONE, std::vector<bool>(model.main.operations.size(), true));
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_3(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& supportedOperations = result.value();
+    EXPECT_EQ(supportedOperations.size(), kSimpleModel.main.operations.size());
+    EXPECT_THAT(supportedOperations, Each(testing::IsTrue()));
+}
+
+TEST(DeviceTest, getSupportedOperationsError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [](const auto& /*model*/, const auto& cb) {
+        cb(V1_3::ErrorStatus::GENERAL_FAILURE, {});
+        return hardware::Void();
+    };
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_3(_, _)).Times(1).WillOnce(Invoke(ret));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_3(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, getSupportedOperationsDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, getSupportedOperations_1_3(_, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->getSupportedOperations(kSimpleModel);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModel) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_3::ErrorStatus::NONE,
+                                                     V1_3::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelLaunchError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_3::ErrorStatus::GENERAL_FAILURE,
+                                                     V1_3::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelReturnError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_3::ErrorStatus::NONE,
+                                                     V1_3::ErrorStatus::GENERAL_FAILURE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelReturn(V1_3::ErrorStatus::NONE,
+                                                     V1_3::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_3::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_3::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModel_1_3(_, _, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModel(kSimpleModel, nn::ExecutionPreference::DEFAULT,
+                                             nn::Priority::DEFAULT, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCache) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockPreparedModel = MockPreparedModel::create();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(
+                    V1_3::ErrorStatus::NONE, V1_3::ErrorStatus::NONE, mockPreparedModel)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, prepareModelFromCacheError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(V1_3::ErrorStatus::GENERAL_FAILURE,
+                                                              V1_3::ErrorStatus::GENERAL_FAILURE,
+                                                              nullptr)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheNullptrError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makePreparedModelFromCacheReturn(V1_3::ErrorStatus::NONE,
+                                                              V1_3::ErrorStatus::NONE, nullptr)));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, prepareModelFromCacheDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, prepareModelFromCacheAsyncCrash) {
+    // setup test
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto ret = [&mockDevice]() -> hardware::Return<V1_3::ErrorStatus> {
+        mockDevice->simulateCrash();
+        return V1_3::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockDevice, prepareModelFromCache_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(DeviceTest, allocate) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    const auto mockBuffer = MockBuffer::create();
+    constexpr uint32_t token = 1;
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeAllocateReturn(ErrorStatus::NONE, mockBuffer, token)));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_NE(result.value(), nullptr);
+}
+
+TEST(DeviceTest, allocateError) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeAllocateReturn(ErrorStatus::GENERAL_FAILURE, nullptr, 0)));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, allocateTransportFailure) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(DeviceTest, allocateDeadObject) {
+    // setup call
+    const auto mockDevice = createMockDevice();
+    const auto device = Device::create(kName, mockDevice).value();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/test/MockBuffer.h b/neuralnetworks/1.3/utils/test/MockBuffer.h
new file mode 100644
index 0000000..fb31b51
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/MockBuffer.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_BUFFER
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_BUFFER
+
+#include <android/hardware/neuralnetworks/1.3/IBuffer.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class MockBuffer final : public IBuffer {
+  public:
+    static sp<MockBuffer> create();
+
+    // V1_3 methods below.
+    MOCK_METHOD(Return<V1_3::ErrorStatus>, copyTo, (const hidl_memory& dst), (override));
+    MOCK_METHOD(Return<V1_3::ErrorStatus>, copyFrom,
+                (const hidl_memory& src, const hidl_vec<uint32_t>& dimensions), (override));
+};
+
+inline sp<MockBuffer> MockBuffer::create() {
+    return sp<MockBuffer>::make();
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_BUFFER
diff --git a/neuralnetworks/1.3/utils/test/MockDevice.h b/neuralnetworks/1.3/utils/test/MockDevice.h
new file mode 100644
index 0000000..85d3750
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/MockDevice.h
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_DEVICE
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_DEVICE
+
+#include <android/hardware/neuralnetworks/1.3/IDevice.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+using CacheToken =
+        hidl_array<uint8_t, static_cast<uint32_t>(V1_2::Constant::BYTE_SIZE_OF_CACHE_TOKEN)>;
+
+class MockDevice final : public IDevice {
+  public:
+    static sp<MockDevice> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient, uint64_t /*cookie*/);
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities, (getCapabilities_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations,
+                (const V1_0::Model& model, getSupportedOperations_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel,
+                (const V1_0::Model& model, const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::DeviceStatus>, getStatus, (), (override));
+
+    // V1_1 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities_1_1, (getCapabilities_1_1_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_1,
+                (const V1_1::Model& model, getSupportedOperations_1_1_cb cb), (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel_1_1,
+                (const V1_1::Model& model, V1_1::ExecutionPreference preference,
+                 const sp<V1_0::IPreparedModelCallback>& callback),
+                (override));
+
+    // V1_2 methods below.
+    MOCK_METHOD(Return<void>, getVersionString, (getVersionString_cb cb), (override));
+    MOCK_METHOD(Return<void>, getType, (getType_cb cb), (override));
+    MOCK_METHOD(Return<void>, getCapabilities_1_2, (getCapabilities_1_2_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedExtensions, (getSupportedExtensions_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_2,
+                (const V1_2::Model& model, getSupportedOperations_1_2_cb cb), (override));
+    MOCK_METHOD(Return<void>, getNumberOfCacheFilesNeeded, (getNumberOfCacheFilesNeeded_cb cb),
+                (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModel_1_2,
+                (const V1_2::Model& model, V1_1::ExecutionPreference preference,
+                 const hidl_vec<hidl_handle>& modelCache, const hidl_vec<hidl_handle>& dataCache,
+                 const CacheToken& token, const sp<V1_2::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, prepareModelFromCache,
+                (const hidl_vec<hidl_handle>& modelCache, const hidl_vec<hidl_handle>& dataCache,
+                 const CacheToken& token, const sp<V1_2::IPreparedModelCallback>& callback),
+                (override));
+
+    // V1_3 methods below.
+    MOCK_METHOD(Return<void>, getCapabilities_1_3, (getCapabilities_1_3_cb cb), (override));
+    MOCK_METHOD(Return<void>, getSupportedOperations_1_3,
+                (const V1_3::Model& model, getSupportedOperations_1_3_cb cb), (override));
+    MOCK_METHOD(Return<V1_3::ErrorStatus>, prepareModel_1_3,
+                (const V1_3::Model& model, V1_1::ExecutionPreference preference,
+                 V1_3::Priority priority, const V1_3::OptionalTimePoint& deadline,
+                 const hidl_vec<hidl_handle>& modelCache, const hidl_vec<hidl_handle>& dataCache,
+                 const CacheToken& token, const sp<V1_3::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<V1_3::ErrorStatus>, prepareModelFromCache_1_3,
+                (const V1_3::OptionalTimePoint& deadline, const hidl_vec<hidl_handle>& modelCache,
+                 const hidl_vec<hidl_handle>& dataCache, const CacheToken& token,
+                 const sp<V1_3::IPreparedModelCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<void>, allocate,
+                (const V1_3::BufferDesc& desc,
+                 const hidl_vec<sp<V1_3::IPreparedModel>>& preparedModels,
+                 const hidl_vec<V1_3::BufferRole>& inputRoles,
+                 const hidl_vec<V1_3::BufferRole>& outputRoles, allocate_cb cb),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockDevice> MockDevice::create() {
+    auto mockDevice = sp<MockDevice>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+inline Return<bool> MockDevice::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                            uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockDevice::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::Device will not use the `cookie` or `who` arguments, so we pass in 0
+    // and nullptr for these arguments instead. Normally, they are used by the hidl_death_recipient
+    // to determine which object is dead. However, the utils::Device code only pairs a single death
+    // recipient with a single HIDL interface object, so these arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_DEVICE
diff --git a/neuralnetworks/1.3/utils/test/MockFencedExecutionCallback.h b/neuralnetworks/1.3/utils/test/MockFencedExecutionCallback.h
new file mode 100644
index 0000000..fc08a7f
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/MockFencedExecutionCallback.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_FENCED_EXECUTION_CALLBACK
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_FENCED_EXECUTION_CALLBACK
+
+#include <android/hardware/neuralnetworks/1.3/IFencedExecutionCallback.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class MockFencedExecutionCallback final : public IFencedExecutionCallback {
+  public:
+    static sp<MockFencedExecutionCallback> create();
+
+    // V1_3 methods below.
+    MOCK_METHOD(Return<void>, getExecutionInfo, (IFencedExecutionCallback::getExecutionInfo_cb cb),
+                (override));
+};
+
+inline sp<MockFencedExecutionCallback> MockFencedExecutionCallback::create() {
+    return sp<MockFencedExecutionCallback>::make();
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_FENCED_EXECUTION_CALLBACK
diff --git a/neuralnetworks/1.3/utils/test/MockPreparedModel.h b/neuralnetworks/1.3/utils/test/MockPreparedModel.h
new file mode 100644
index 0000000..e441524
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/MockPreparedModel.h
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_PREPARED_MODEL
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_PREPARED_MODEL
+
+#include <android/hardware/neuralnetworks/1.3/IPreparedModel.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/HidlSupport.h>
+#include <hidl/Status.h>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class MockPreparedModel final : public IPreparedModel {
+  public:
+    static sp<MockPreparedModel> create();
+
+    // IBase methods below.
+    MOCK_METHOD(Return<void>, ping, (), (override));
+    MOCK_METHOD(Return<bool>, linkToDeathRet, ());
+    Return<bool> linkToDeath(const sp<hidl_death_recipient>& recipient,
+                             uint64_t /*cookie*/) override;
+
+    // V1_0 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute,
+                (const V1_0::Request& request, const sp<V1_0::IExecutionCallback>& callback),
+                (override));
+
+    // V1_2 methods below.
+    MOCK_METHOD(Return<V1_0::ErrorStatus>, execute_1_2,
+                (const V1_0::Request& request, V1_2::MeasureTiming measure,
+                 const sp<V1_2::IExecutionCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<void>, executeSynchronously,
+                (const V1_0::Request& request, V1_2::MeasureTiming measure,
+                 executeSynchronously_cb cb),
+                (override));
+    MOCK_METHOD(Return<void>, configureExecutionBurst,
+                (const sp<V1_2::IBurstCallback>& callback,
+                 const MQDescriptorSync<V1_2::FmqRequestDatum>& requestChannel,
+                 const MQDescriptorSync<V1_2::FmqResultDatum>& resultChannel,
+                 configureExecutionBurst_cb cb),
+                (override));
+
+    // V1_3 methods below.
+    MOCK_METHOD(Return<V1_3::ErrorStatus>, execute_1_3,
+                (const V1_3::Request& request, V1_2::MeasureTiming measure,
+                 const V1_3::OptionalTimePoint& deadline,
+                 const V1_3::OptionalTimeoutDuration& loopTimeoutDuration,
+                 const sp<V1_3::IExecutionCallback>& callback),
+                (override));
+    MOCK_METHOD(Return<void>, executeSynchronously_1_3,
+                (const V1_3::Request& request, V1_2::MeasureTiming measure,
+                 const V1_3::OptionalTimePoint& deadline,
+                 const V1_3::OptionalTimeoutDuration& loopTimeoutDuration,
+                 executeSynchronously_1_3_cb cb),
+                (override));
+    MOCK_METHOD(Return<void>, executeFenced,
+                (const V1_3::Request& request, const hidl_vec<hidl_handle>& waitFor,
+                 V1_2::MeasureTiming measure, const V1_3::OptionalTimePoint& deadline,
+                 const V1_3::OptionalTimeoutDuration& loopTimeoutDuration,
+                 const V1_3::OptionalTimeoutDuration& duration, executeFenced_cb cb),
+                (override));
+
+    // Helper methods.
+    void simulateCrash();
+
+  private:
+    sp<hidl_death_recipient> mDeathRecipient;
+};
+
+inline sp<MockPreparedModel> MockPreparedModel::create() {
+    auto mockPreparedModel = sp<MockPreparedModel>::make();
+
+    // Setup default actions for each relevant call.
+    const auto ret = []() -> Return<bool> { return true; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockPreparedModel, linkToDeathRet()).WillByDefault(testing::Invoke(ret));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(testing::AnyNumber());
+
+    return mockPreparedModel;
+}
+
+inline Return<bool> MockPreparedModel::linkToDeath(const sp<hidl_death_recipient>& recipient,
+                                                   uint64_t /*cookie*/) {
+    mDeathRecipient = recipient;
+    return linkToDeathRet();
+}
+
+inline void MockPreparedModel::simulateCrash() {
+    ASSERT_NE(nullptr, mDeathRecipient.get());
+
+    // Currently, the utils::PreparedModel will not use the `cookie` or `who` arguments, so we pass
+    // in 0 and nullptr for these arguments instead. Normally, they are used by the
+    // hidl_death_recipient to determine which object is dead. However, the utils::PreparedModel
+    // code only pairs a single death recipient with a single HIDL interface object, so these
+    // arguments are redundant.
+    mDeathRecipient->serviceDied(0, nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_TEST_MOCK_PREPARED_MODEL
diff --git a/neuralnetworks/1.3/utils/test/PreparedModelTest.cpp b/neuralnetworks/1.3/utils/test/PreparedModelTest.cpp
new file mode 100644
index 0000000..11796dd
--- /dev/null
+++ b/neuralnetworks/1.3/utils/test/PreparedModelTest.cpp
@@ -0,0 +1,470 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockFencedExecutionCallback.h"
+#include "MockPreparedModel.h"
+
+#include <android/hardware/neuralnetworks/1.3/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.3/IFencedExecutionCallback.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.3/PreparedModel.h>
+
+#include <functional>
+#include <memory>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::InvokeWithoutArgs;
+
+const sp<V1_3::IPreparedModel> kInvalidPreparedModel;
+constexpr auto kNoTiming = V1_2::Timing{.timeOnDevice = std::numeric_limits<uint64_t>::max(),
+                                        .timeInDriver = std::numeric_limits<uint64_t>::max()};
+
+sp<MockPreparedModel> createMockPreparedModel() {
+    const auto mockPreparedModel = MockPreparedModel::create();
+
+    // Ensure that older calls are not used.
+    EXPECT_CALL(*mockPreparedModel, execute(_, _)).Times(0);
+    EXPECT_CALL(*mockPreparedModel, execute_1_2(_, _, _)).Times(0);
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously(_, _, _)).Times(0);
+
+    return mockPreparedModel;
+}
+
+auto makeExecuteSynchronously(V1_3::ErrorStatus status,
+                              const std::vector<V1_2::OutputShape>& outputShapes,
+                              const V1_2::Timing& timing) {
+    return [status, outputShapes, timing](
+                   const V1_3::Request& /*request*/, V1_2::MeasureTiming /*measureTiming*/,
+                   const V1_3::OptionalTimePoint& /*deadline*/,
+                   const V1_3::OptionalTimeoutDuration& /*loopTimeoutDuration*/,
+                   const V1_3::IPreparedModel::executeSynchronously_1_3_cb& cb) {
+        cb(status, outputShapes, timing);
+        return hardware::Void();
+    };
+}
+auto makeExecuteAsynchronously(V1_3::ErrorStatus launchStatus, V1_3::ErrorStatus returnStatus,
+                               const std::vector<V1_2::OutputShape>& outputShapes,
+                               const V1_2::Timing& timing) {
+    return [launchStatus, returnStatus, outputShapes, timing](
+                   const V1_3::Request& /*request*/, V1_2::MeasureTiming /*measureTiming*/,
+                   const V1_3::OptionalTimePoint& /*deadline*/,
+                   const V1_3::OptionalTimeoutDuration& /*loopTimeoutDuration*/,
+                   const sp<V1_3::IExecutionCallback>& cb) -> Return<V1_3::ErrorStatus> {
+        cb->notify_1_3(returnStatus, outputShapes, timing);
+        return launchStatus;
+    };
+}
+auto makeExecuteFencedReturn(V1_3::ErrorStatus status, const hardware::hidl_handle& syncFence,
+                             const sp<V1_3::IFencedExecutionCallback>& dispatchCallback) {
+    return [status, syncFence, dispatchCallback](
+                   const V1_3::Request& /*request*/,
+                   const hardware::hidl_vec<hardware::hidl_handle>& /*waitFor*/,
+                   V1_2::MeasureTiming /*measure*/, const V1_3::OptionalTimePoint& /*deadline*/,
+                   const V1_3::OptionalTimeoutDuration& /*loopTimeoutDuration*/,
+                   const V1_3::OptionalTimeoutDuration& /*duration*/,
+                   const V1_3::IPreparedModel::executeFenced_cb& cb) {
+        cb(status, syncFence, dispatchCallback);
+        return hardware::Void();
+    };
+}
+auto makeExecuteFencedCallbackReturn(V1_3::ErrorStatus status, const V1_2::Timing& timingA,
+                                     const V1_2::Timing& timingB) {
+    return [status, timingA,
+            timingB](const V1_3::IFencedExecutionCallback::getExecutionInfo_cb& cb) {
+        cb(status, timingA, timingB);
+        return hardware::Void();
+    };
+}
+
+std::function<hardware::Status()> makeTransportFailure(status_t status) {
+    return [status] { return hardware::Status::fromStatusT(status); };
+}
+
+const auto makeGeneralTransportFailure = makeTransportFailure(NO_MEMORY);
+const auto makeDeadObjectFailure = makeTransportFailure(DEAD_OBJECT);
+
+}  // namespace
+
+TEST(PreparedModelTest, invalidPreparedModel) {
+    // run test
+    const auto result = PreparedModel::create(kInvalidPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathError) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto ret = []() -> Return<bool> { return false; };
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet()).Times(1).WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathTransportFailure) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, linkToDeathDeadObject) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModel, linkToDeathRet())
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeSync) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteSynchronously(V1_3::ErrorStatus::NONE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(PreparedModelTest, executeSyncError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(
+                    makeExecuteSynchronously(V1_3::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeSyncTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeSyncDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeSynchronously_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeAsync) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(V1_3::ErrorStatus::NONE,
+                                                       V1_3::ErrorStatus::NONE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    EXPECT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(PreparedModelTest, executeAsyncLaunchError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(V1_3::ErrorStatus::GENERAL_FAILURE,
+                                                       V1_3::ErrorStatus::GENERAL_FAILURE, {},
+                                                       kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncReturnError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteAsynchronously(
+                    V1_3::ErrorStatus::NONE, V1_3::ErrorStatus::GENERAL_FAILURE, {}, kNoTiming)));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeAsyncDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeAsyncCrash) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/false).value();
+    const auto ret = [&mockPreparedModel]() -> hardware::Return<V1_3::ErrorStatus> {
+        mockPreparedModel->simulateCrash();
+        return V1_3::ErrorStatus::NONE;
+    };
+    EXPECT_CALL(*mockPreparedModel, execute_1_3(_, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(ret));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(PreparedModelTest, executeFenced) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    const auto mockCallback = MockFencedExecutionCallback::create();
+    EXPECT_CALL(*mockCallback, getExecutionInfo(_))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteFencedCallbackReturn(V1_3::ErrorStatus::NONE, kNoTiming,
+                                                             kNoTiming)));
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteFencedReturn(V1_3::ErrorStatus::NONE, {}, mockCallback)));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& [syncFence, callback] = result.value();
+    EXPECT_EQ(syncFence.syncWait({}), nn::SyncFence::FenceState::SIGNALED);
+    ASSERT_NE(callback, nullptr);
+
+    // get results from callback
+    const auto callbackResult = callback();
+    ASSERT_TRUE(callbackResult.has_value()) << "Failed with " << callbackResult.error().code << ": "
+                                            << callbackResult.error().message;
+}
+
+TEST(PreparedModelTest, executeFencedCallbackError) {
+    // setup call
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    const auto mockCallback = MockFencedExecutionCallback::create();
+    EXPECT_CALL(*mockCallback, getExecutionInfo(_))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteFencedCallbackReturn(V1_3::ErrorStatus::GENERAL_FAILURE,
+                                                             kNoTiming, kNoTiming)));
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(makeExecuteFencedReturn(V1_3::ErrorStatus::NONE, {}, mockCallback)));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    const auto& [syncFence, callback] = result.value();
+    EXPECT_NE(syncFence.syncWait({}), nn::SyncFence::FenceState::ACTIVE);
+    ASSERT_NE(callback, nullptr);
+
+    // verify callback failure
+    const auto callbackResult = callback();
+    ASSERT_FALSE(callbackResult.has_value());
+    EXPECT_EQ(callbackResult.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeFencedError) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Invoke(
+                    makeExecuteFencedReturn(V1_3::ErrorStatus::GENERAL_FAILURE, {}, nullptr)));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeFencedTransportFailure) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeGeneralTransportFailure));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(PreparedModelTest, executeFencedDeadObject) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(InvokeWithoutArgs(makeDeadObjectFailure));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+// TODO: test burst execution if/when it is added to nn::IPreparedModel.
+
+TEST(PreparedModelTest, getUnderlyingResource) {
+    // setup test
+    const auto mockPreparedModel = createMockPreparedModel();
+    const auto preparedModel =
+            PreparedModel::create(mockPreparedModel, /*executeSynchronously=*/true).value();
+
+    // run test
+    const auto resource = preparedModel->getUnderlyingResource();
+
+    // verify resource
+    const sp<V1_3::IPreparedModel>* maybeMock = std::any_cast<sp<V1_3::IPreparedModel>>(&resource);
+    ASSERT_NE(maybeMock, nullptr);
+    EXPECT_EQ(maybeMock->get(), mockPreparedModel.get());
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/TEST_MAPPING b/neuralnetworks/TEST_MAPPING
index ca5041d..de84624 100644
--- a/neuralnetworks/TEST_MAPPING
+++ b/neuralnetworks/TEST_MAPPING
@@ -1,6 +1,21 @@
 {
   "presubmit": [
     {
+      "name": "neuralnetworks_utils_hal_common_test"
+    },
+    {
+      "name": "neuralnetworks_utils_hal_1_0_test"
+    },
+    {
+      "name": "neuralnetworks_utils_hal_1_1_test"
+    },
+    {
+      "name": "neuralnetworks_utils_hal_1_2_test"
+    },
+    {
+      "name": "neuralnetworks_utils_hal_1_3_test"
+    },
+    {
       "name": "VtsHalNeuralnetworksV1_0TargetTest",
       "options": [
         {
diff --git a/neuralnetworks/utils/common/Android.bp b/neuralnetworks/utils/common/Android.bp
index 21562cf..6c491ae 100644
--- a/neuralnetworks/utils/common/Android.bp
+++ b/neuralnetworks/utils/common/Android.bp
@@ -28,3 +28,28 @@
         "libhidlbase",
     ],
 }
+
+cc_test {
+    name: "neuralnetworks_utils_hal_common_test",
+    srcs: ["test/*.cpp"],
+    static_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "libgmock",
+        "libneuralnetworks_common",
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_common",
+    ],
+    shared_libs: [
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "libhidlmemory",
+        "liblog",
+        "libnativewindow",
+        "libutils",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/InvalidBurst.h b/neuralnetworks/utils/common/include/nnapi/hal/InvalidBurst.h
new file mode 100644
index 0000000..83e60b6
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/InvalidBurst.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_INVALID_BURST_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_INVALID_BURST_H
+
+#include <nnapi/IBurst.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <memory>
+#include <optional>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class InvalidBurst final : public nn::IBurst {
+  public:
+    OptionalCacheHold cacheMemory(const nn::Memory& memory) const override;
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure) const override;
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_INVALID_BURST_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/InvalidDevice.h b/neuralnetworks/utils/common/include/nnapi/hal/InvalidDevice.h
index 5e62b9a..d843526 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/InvalidDevice.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/InvalidDevice.h
@@ -32,7 +32,7 @@
 class InvalidDevice final : public nn::IDevice {
   public:
     InvalidDevice(std::string name, std::string versionString, nn::Version featureLevel,
-                  nn::DeviceType type, std::vector<nn::Extension> extensions,
+                  nn::DeviceType type, bool isUpdatable, std::vector<nn::Extension> extensions,
                   nn::Capabilities capabilities,
                   std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded);
 
@@ -40,6 +40,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
@@ -70,6 +71,7 @@
     const std::string kVersionString;
     const nn::Version kFeatureLevel;
     const nn::DeviceType kType;
+    const bool kIsUpdatable;
     const std::vector<nn::Extension> kExtensions;
     const nn::Capabilities kCapabilities;
     const std::pair<uint32_t, uint32_t> kNumberOfCacheFilesNeeded;
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/InvalidPreparedModel.h b/neuralnetworks/utils/common/include/nnapi/hal/InvalidPreparedModel.h
index 985cddb..3e1dca7 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/InvalidPreparedModel.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/InvalidPreparedModel.h
@@ -40,6 +40,8 @@
             const nn::OptionalDuration& loopTimeoutDuration,
             const nn::OptionalDuration& timeoutDurationAfterFence) const override;
 
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurst() const override;
+
     std::any getUnderlyingResource() const override;
 };
 
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h
index 9d5e3e6..d2c2469 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h
@@ -42,7 +42,7 @@
                              nn::SharedBuffer buffer);
 
     nn::SharedBuffer getBuffer() const;
-    nn::SharedBuffer recover(const nn::IBuffer* failingBuffer, bool blocking) const;
+    nn::GeneralResult<nn::SharedBuffer> recover(const nn::IBuffer* failingBuffer) const;
 
     nn::Request::MemoryDomainToken getToken() const override;
 
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientBurst.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBurst.h
new file mode 100644
index 0000000..0df287f
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBurst.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
+
+#include <android-base/thread_annotations.h>
+#include <nnapi/IBurst.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class ResilientBurst final : public nn::IBurst,
+                             public std::enable_shared_from_this<ResilientBurst> {
+    struct PrivateConstructorTag {};
+
+  public:
+    using Factory = std::function<nn::GeneralResult<nn::SharedBurst>()>;
+
+    static nn::GeneralResult<std::shared_ptr<const ResilientBurst>> create(Factory makeBurst);
+
+    ResilientBurst(PrivateConstructorTag tag, Factory makeBurst, nn::SharedBurst burst);
+
+    nn::SharedBurst getBurst() const;
+    nn::GeneralResult<nn::SharedBurst> recover(const nn::IBurst* failingBurst) const;
+
+    OptionalCacheHold cacheMemory(const nn::Memory& memory) const override;
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure) const override;
+
+  private:
+    const Factory kMakeBurst;
+    mutable std::mutex mMutex;
+    mutable nn::SharedBurst mBurst GUARDED_BY(mMutex);
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h
index 84ae799..8199c52 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h
@@ -53,6 +53,7 @@
     const std::string& getVersionString() const override;
     nn::Version getFeatureLevel() const override;
     nn::DeviceType getType() const override;
+    bool isUpdatable() const override;
     const std::vector<nn::Extension>& getSupportedExtensions() const override;
     const nn::Capabilities& getCapabilities() const override;
     std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h
index faae673..a6c1b19 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h
@@ -30,7 +30,8 @@
 
 namespace android::hardware::neuralnetworks::utils {
 
-class ResilientPreparedModel final : public nn::IPreparedModel {
+class ResilientPreparedModel final : public nn::IPreparedModel,
+                                     public std::enable_shared_from_this<ResilientPreparedModel> {
     struct PrivateConstructorTag {};
 
   public:
@@ -43,8 +44,8 @@
                                     nn::SharedPreparedModel preparedModel);
 
     nn::SharedPreparedModel getPreparedModel() const;
-    nn::SharedPreparedModel recover(const nn::IPreparedModel* failingPreparedModel,
-                                    bool blocking) const;
+    nn::GeneralResult<nn::SharedPreparedModel> recover(
+            const nn::IPreparedModel* failingPreparedModel) const;
 
     nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
             const nn::Request& request, nn::MeasureTiming measure,
@@ -57,9 +58,14 @@
             const nn::OptionalDuration& loopTimeoutDuration,
             const nn::OptionalDuration& timeoutDurationAfterFence) const override;
 
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurst() const override;
+
     std::any getUnderlyingResource() const override;
 
   private:
+    bool isValidInternal() const EXCLUDES(mMutex);
+    nn::GeneralResult<nn::SharedBurst> configureExecutionBurstInternal() const;
+
     const Factory kMakePreparedModel;
     mutable std::mutex mMutex;
     mutable nn::SharedPreparedModel mPreparedModel GUARDED_BY(mMutex);
diff --git a/neuralnetworks/utils/common/src/InvalidBurst.cpp b/neuralnetworks/utils/common/src/InvalidBurst.cpp
new file mode 100644
index 0000000..4ca6603
--- /dev/null
+++ b/neuralnetworks/utils/common/src/InvalidBurst.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "InvalidBurst.h"
+
+#include <nnapi/IBurst.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <memory>
+#include <optional>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::utils {
+
+InvalidBurst::OptionalCacheHold InvalidBurst::cacheMemory(const nn::Memory& /*memory*/) const {
+    return nullptr;
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> InvalidBurst::execute(
+        const nn::Request& /*request*/, nn::MeasureTiming /*measure*/) const {
+    return NN_ERROR() << "InvalidBurst";
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/InvalidDevice.cpp b/neuralnetworks/utils/common/src/InvalidDevice.cpp
index 535ccb4..81bca7f 100644
--- a/neuralnetworks/utils/common/src/InvalidDevice.cpp
+++ b/neuralnetworks/utils/common/src/InvalidDevice.cpp
@@ -32,13 +32,14 @@
 namespace android::hardware::neuralnetworks::utils {
 
 InvalidDevice::InvalidDevice(std::string name, std::string versionString, nn::Version featureLevel,
-                             nn::DeviceType type, std::vector<nn::Extension> extensions,
-                             nn::Capabilities capabilities,
+                             nn::DeviceType type, bool isUpdatable,
+                             std::vector<nn::Extension> extensions, nn::Capabilities capabilities,
                              std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded)
     : kName(std::move(name)),
       kVersionString(std::move(versionString)),
       kFeatureLevel(featureLevel),
       kType(type),
+      kIsUpdatable(isUpdatable),
       kExtensions(std::move(extensions)),
       kCapabilities(std::move(capabilities)),
       kNumberOfCacheFilesNeeded(numberOfCacheFilesNeeded) {}
@@ -59,6 +60,10 @@
     return kType;
 }
 
+bool InvalidDevice::isUpdatable() const {
+    return kIsUpdatable;
+}
+
 const std::vector<nn::Extension>& InvalidDevice::getSupportedExtensions() const {
     return kExtensions;
 }
diff --git a/neuralnetworks/utils/common/src/InvalidPreparedModel.cpp b/neuralnetworks/utils/common/src/InvalidPreparedModel.cpp
index a46f4ac..9081e1f 100644
--- a/neuralnetworks/utils/common/src/InvalidPreparedModel.cpp
+++ b/neuralnetworks/utils/common/src/InvalidPreparedModel.cpp
@@ -42,6 +42,10 @@
     return NN_ERROR() << "InvalidPreparedModel";
 }
 
+nn::GeneralResult<nn::SharedBurst> InvalidPreparedModel::configureExecutionBurst() const {
+    return NN_ERROR() << "InvalidPreparedModel";
+}
+
 std::any InvalidPreparedModel::getUnderlyingResource() const {
     return {};
 }
diff --git a/neuralnetworks/utils/common/src/ResilientBuffer.cpp b/neuralnetworks/utils/common/src/ResilientBuffer.cpp
index cf5496a..47abbe2 100644
--- a/neuralnetworks/utils/common/src/ResilientBuffer.cpp
+++ b/neuralnetworks/utils/common/src/ResilientBuffer.cpp
@@ -20,6 +20,7 @@
 #include <android-base/thread_annotations.h>
 #include <nnapi/IBuffer.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 
 #include <functional>
@@ -29,6 +30,34 @@
 #include <vector>
 
 namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+template <typename FnType>
+auto protect(const ResilientBuffer& resilientBuffer, const FnType& fn)
+        -> decltype(fn(*resilientBuffer.getBuffer())) {
+    auto buffer = resilientBuffer.getBuffer();
+    auto result = fn(*buffer);
+
+    // Immediately return if device is not dead.
+    if (result.has_value() || result.error().code != nn::ErrorStatus::DEAD_OBJECT) {
+        return result;
+    }
+
+    // Attempt recovery and return if it fails.
+    auto maybeBuffer = resilientBuffer.recover(buffer.get());
+    if (!maybeBuffer.has_value()) {
+        const auto& [resultErrorMessage, resultErrorCode] = result.error();
+        const auto& [recoveryErrorMessage, recoveryErrorCode] = maybeBuffer.error();
+        return nn::error(resultErrorCode)
+               << resultErrorMessage << ", and failed to recover dead buffer with error "
+               << recoveryErrorCode << ": " << recoveryErrorMessage;
+    }
+    buffer = std::move(maybeBuffer).value();
+
+    return fn(*buffer);
+}
+
+}  // namespace
 
 nn::GeneralResult<std::shared_ptr<const ResilientBuffer>> ResilientBuffer::create(
         Factory makeBuffer) {
@@ -53,9 +82,16 @@
     std::lock_guard guard(mMutex);
     return mBuffer;
 }
-nn::SharedBuffer ResilientBuffer::recover(const nn::IBuffer* /*failingBuffer*/,
-                                          bool /*blocking*/) const {
+nn::GeneralResult<nn::SharedBuffer> ResilientBuffer::recover(
+        const nn::IBuffer* failingBuffer) const {
     std::lock_guard guard(mMutex);
+
+    // Another caller updated the failing prepared model.
+    if (mBuffer.get() != failingBuffer) {
+        return mBuffer;
+    }
+
+    mBuffer = NN_TRY(kMakeBuffer());
     return mBuffer;
 }
 
@@ -64,12 +100,16 @@
 }
 
 nn::GeneralResult<void> ResilientBuffer::copyTo(const nn::Memory& dst) const {
-    return getBuffer()->copyTo(dst);
+    const auto fn = [&dst](const nn::IBuffer& buffer) { return buffer.copyTo(dst); };
+    return protect(*this, fn);
 }
 
 nn::GeneralResult<void> ResilientBuffer::copyFrom(const nn::Memory& src,
                                                   const nn::Dimensions& dimensions) const {
-    return getBuffer()->copyFrom(src, dimensions);
+    const auto fn = [&src, &dimensions](const nn::IBuffer& buffer) {
+        return buffer.copyFrom(src, dimensions);
+    };
+    return protect(*this, fn);
 }
 
 }  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/ResilientBurst.cpp b/neuralnetworks/utils/common/src/ResilientBurst.cpp
new file mode 100644
index 0000000..0d3cb33
--- /dev/null
+++ b/neuralnetworks/utils/common/src/ResilientBurst.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ResilientBurst.h"
+
+#include <android-base/logging.h>
+#include <android-base/thread_annotations.h>
+#include <nnapi/IBurst.h>
+#include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+template <typename FnType>
+auto protect(const ResilientBurst& resilientBurst, const FnType& fn)
+        -> decltype(fn(*resilientBurst.getBurst())) {
+    auto burst = resilientBurst.getBurst();
+    auto result = fn(*burst);
+
+    // Immediately return if burst is not dead.
+    if (result.has_value() || result.error().code != nn::ErrorStatus::DEAD_OBJECT) {
+        return result;
+    }
+
+    // Attempt recovery and return if it fails.
+    auto maybeBurst = resilientBurst.recover(burst.get());
+    if (!maybeBurst.has_value()) {
+        auto [resultErrorMessage, resultErrorCode, resultOutputShapes] = std::move(result).error();
+        const auto& [recoveryErrorMessage, recoveryErrorCode] = maybeBurst.error();
+        return nn::error(resultErrorCode, std::move(resultOutputShapes))
+               << resultErrorMessage << ", and failed to recover dead burst object with error "
+               << recoveryErrorCode << ": " << recoveryErrorMessage;
+    }
+    burst = std::move(maybeBurst).value();
+
+    return fn(*burst);
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const ResilientBurst>> ResilientBurst::create(Factory makeBurst) {
+    if (makeBurst == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "utils::ResilientBurst::create must have non-empty makeBurst";
+    }
+    auto burst = NN_TRY(makeBurst());
+    CHECK(burst != nullptr);
+    return std::make_shared<ResilientBurst>(PrivateConstructorTag{}, std::move(makeBurst),
+                                            std::move(burst));
+}
+
+ResilientBurst::ResilientBurst(PrivateConstructorTag /*tag*/, Factory makeBurst,
+                               nn::SharedBurst burst)
+    : kMakeBurst(std::move(makeBurst)), mBurst(std::move(burst)) {
+    CHECK(kMakeBurst != nullptr);
+    CHECK(mBurst != nullptr);
+}
+
+nn::SharedBurst ResilientBurst::getBurst() const {
+    std::lock_guard guard(mMutex);
+    return mBurst;
+}
+
+nn::GeneralResult<nn::SharedBurst> ResilientBurst::recover(const nn::IBurst* failingBurst) const {
+    std::lock_guard guard(mMutex);
+
+    // Another caller updated the failing burst.
+    if (mBurst.get() != failingBurst) {
+        return mBurst;
+    }
+
+    mBurst = NN_TRY(kMakeBurst());
+    return mBurst;
+}
+
+ResilientBurst::OptionalCacheHold ResilientBurst::cacheMemory(const nn::Memory& memory) const {
+    return getBurst()->cacheMemory(memory);
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> ResilientBurst::execute(
+        const nn::Request& request, nn::MeasureTiming measure) const {
+    const auto fn = [&request, measure](const nn::IBurst& burst) {
+        return burst.execute(request, measure);
+    };
+    return protect(*this, fn);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/ResilientDevice.cpp b/neuralnetworks/utils/common/src/ResilientDevice.cpp
index 6ad3fad..13965af 100644
--- a/neuralnetworks/utils/common/src/ResilientDevice.cpp
+++ b/neuralnetworks/utils/common/src/ResilientDevice.cpp
@@ -122,12 +122,14 @@
     };
     if (compare(&IDevice::getName) || compare(&IDevice::getVersionString) ||
         compare(&IDevice::getFeatureLevel) || compare(&IDevice::getType) ||
-        compare(&IDevice::getSupportedExtensions) || compare(&IDevice::getCapabilities)) {
+        compare(&IDevice::isUpdatable) || compare(&IDevice::getSupportedExtensions) ||
+        compare(&IDevice::getCapabilities)) {
         LOG(ERROR) << "Recovered device has different metadata than what is cached. Marking "
                       "IDevice object as invalid.";
         device = std::make_shared<const InvalidDevice>(
-                kName, kVersionString, mDevice->getFeatureLevel(), mDevice->getType(), kExtensions,
-                kCapabilities, mDevice->getNumberOfCacheFilesNeeded());
+                kName, kVersionString, mDevice->getFeatureLevel(), mDevice->getType(),
+                mDevice->isUpdatable(), kExtensions, kCapabilities,
+                mDevice->getNumberOfCacheFilesNeeded());
         mIsValid = false;
     }
 
@@ -151,6 +153,10 @@
     return getDevice()->getType();
 }
 
+bool ResilientDevice::isUpdatable() const {
+    return getDevice()->isUpdatable();
+}
+
 const std::vector<nn::Extension>& ResilientDevice::getSupportedExtensions() const {
     return kExtensions;
 }
@@ -180,6 +186,7 @@
         const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
         nn::OptionalTimePoint deadline, const std::vector<nn::SharedHandle>& modelCache,
         const std::vector<nn::SharedHandle>& dataCache, const nn::CacheToken& token) const {
+#if 0
     auto self = shared_from_this();
     ResilientPreparedModel::Factory makePreparedModel = [device = std::move(self), model,
                                                          preference, priority, deadline, modelCache,
@@ -188,29 +195,41 @@
                                             dataCache, token);
     };
     return ResilientPreparedModel::create(std::move(makePreparedModel));
+#else
+    return prepareModelInternal(model, preference, priority, deadline, modelCache, dataCache,
+                                token);
+#endif
 }
 
 nn::GeneralResult<nn::SharedPreparedModel> ResilientDevice::prepareModelFromCache(
         nn::OptionalTimePoint deadline, const std::vector<nn::SharedHandle>& modelCache,
         const std::vector<nn::SharedHandle>& dataCache, const nn::CacheToken& token) const {
+#if 0
     auto self = shared_from_this();
     ResilientPreparedModel::Factory makePreparedModel = [device = std::move(self), deadline,
                                                          modelCache, dataCache, token] {
         return device->prepareModelFromCacheInternal(deadline, modelCache, dataCache, token);
     };
     return ResilientPreparedModel::create(std::move(makePreparedModel));
+#else
+    return prepareModelFromCacheInternal(deadline, modelCache, dataCache, token);
+#endif
 }
 
 nn::GeneralResult<nn::SharedBuffer> ResilientDevice::allocate(
         const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
         const std::vector<nn::BufferRole>& inputRoles,
         const std::vector<nn::BufferRole>& outputRoles) const {
+#if 0
     auto self = shared_from_this();
     ResilientBuffer::Factory makeBuffer = [device = std::move(self), desc, preparedModels,
                                            inputRoles, outputRoles] {
         return device->allocateInternal(desc, preparedModels, inputRoles, outputRoles);
     };
     return ResilientBuffer::create(std::move(makeBuffer));
+#else
+    return allocateInternal(desc, preparedModels, inputRoles, outputRoles);
+#endif
 }
 
 bool ResilientDevice::isValidInternal() const {
@@ -225,8 +244,8 @@
     if (!isValidInternal()) {
         return std::make_shared<const InvalidPreparedModel>();
     }
-    const auto fn = [&model, preference, priority, deadline, &modelCache, &dataCache,
-                     token](const nn::IDevice& device) {
+    const auto fn = [&model, preference, priority, &deadline, &modelCache, &dataCache,
+                     &token](const nn::IDevice& device) {
         return device.prepareModel(model, preference, priority, deadline, modelCache, dataCache,
                                    token);
     };
@@ -239,7 +258,7 @@
     if (!isValidInternal()) {
         return std::make_shared<const InvalidPreparedModel>();
     }
-    const auto fn = [deadline, &modelCache, &dataCache, token](const nn::IDevice& device) {
+    const auto fn = [&deadline, &modelCache, &dataCache, &token](const nn::IDevice& device) {
         return device.prepareModelFromCache(deadline, modelCache, dataCache, token);
     };
     return protect(*this, fn, /*blocking=*/false);
diff --git a/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp b/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp
index b8acee1..5dd5f99 100644
--- a/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp
+++ b/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp
@@ -16,19 +16,52 @@
 
 #include "ResilientPreparedModel.h"
 
+#include "InvalidBurst.h"
+#include "ResilientBurst.h"
+
 #include <android-base/logging.h>
 #include <android-base/thread_annotations.h>
 #include <nnapi/IPreparedModel.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 
 #include <functional>
 #include <memory>
 #include <mutex>
+#include <sstream>
 #include <utility>
 #include <vector>
 
 namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+template <typename FnType>
+auto protect(const ResilientPreparedModel& resilientPreparedModel, const FnType& fn)
+        -> decltype(fn(*resilientPreparedModel.getPreparedModel())) {
+    auto preparedModel = resilientPreparedModel.getPreparedModel();
+    auto result = fn(*preparedModel);
+
+    // Immediately return if prepared model is not dead.
+    if (result.has_value() || result.error().code != nn::ErrorStatus::DEAD_OBJECT) {
+        return result;
+    }
+
+    // Attempt recovery and return if it fails.
+    auto maybePreparedModel = resilientPreparedModel.recover(preparedModel.get());
+    if (!maybePreparedModel.has_value()) {
+        const auto& [message, code] = maybePreparedModel.error();
+        std::ostringstream oss;
+        oss << ", and failed to recover dead prepared model with error " << code << ": " << message;
+        result.error().message += oss.str();
+        return result;
+    }
+    preparedModel = std::move(maybePreparedModel).value();
+
+    return fn(*preparedModel);
+}
+
+}  // namespace
 
 nn::GeneralResult<std::shared_ptr<const ResilientPreparedModel>> ResilientPreparedModel::create(
         Factory makePreparedModel) {
@@ -55,9 +88,16 @@
     return mPreparedModel;
 }
 
-nn::SharedPreparedModel ResilientPreparedModel::recover(
-        const nn::IPreparedModel* /*failingPreparedModel*/, bool /*blocking*/) const {
+nn::GeneralResult<nn::SharedPreparedModel> ResilientPreparedModel::recover(
+        const nn::IPreparedModel* failingPreparedModel) const {
     std::lock_guard guard(mMutex);
+
+    // Another caller updated the failing prepared model.
+    if (mPreparedModel.get() != failingPreparedModel) {
+        return mPreparedModel;
+    }
+
+    mPreparedModel = NN_TRY(kMakePreparedModel());
     return mPreparedModel;
 }
 
@@ -65,7 +105,11 @@
 ResilientPreparedModel::execute(const nn::Request& request, nn::MeasureTiming measure,
                                 const nn::OptionalTimePoint& deadline,
                                 const nn::OptionalDuration& loopTimeoutDuration) const {
-    return getPreparedModel()->execute(request, measure, deadline, loopTimeoutDuration);
+    const auto fn = [&request, measure, &deadline,
+                     &loopTimeoutDuration](const nn::IPreparedModel& preparedModel) {
+        return preparedModel.execute(request, measure, deadline, loopTimeoutDuration);
+    };
+    return protect(*this, fn);
 }
 
 nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
@@ -75,12 +119,43 @@
                                       const nn::OptionalTimePoint& deadline,
                                       const nn::OptionalDuration& loopTimeoutDuration,
                                       const nn::OptionalDuration& timeoutDurationAfterFence) const {
-    return getPreparedModel()->executeFenced(request, waitFor, measure, deadline,
-                                             loopTimeoutDuration, timeoutDurationAfterFence);
+    const auto fn = [&request, &waitFor, measure, &deadline, &loopTimeoutDuration,
+                     &timeoutDurationAfterFence](const nn::IPreparedModel& preparedModel) {
+        return preparedModel.executeFenced(request, waitFor, measure, deadline, loopTimeoutDuration,
+                                           timeoutDurationAfterFence);
+    };
+    return protect(*this, fn);
+}
+
+nn::GeneralResult<nn::SharedBurst> ResilientPreparedModel::configureExecutionBurst() const {
+#if 0
+    auto self = shared_from_this();
+    ResilientBurst::Factory makeBurst =
+            [preparedModel = std::move(self)]() -> nn::GeneralResult<nn::SharedBurst> {
+        return preparedModel->configureExecutionBurst();
+    };
+    return ResilientBurst::create(std::move(makeBurst));
+#else
+    return configureExecutionBurstInternal();
+#endif
 }
 
 std::any ResilientPreparedModel::getUnderlyingResource() const {
     return getPreparedModel()->getUnderlyingResource();
 }
 
+bool ResilientPreparedModel::isValidInternal() const {
+    return true;
+}
+
+nn::GeneralResult<nn::SharedBurst> ResilientPreparedModel::configureExecutionBurstInternal() const {
+    if (!isValidInternal()) {
+        return std::make_shared<const InvalidBurst>();
+    }
+    const auto fn = [](const nn::IPreparedModel& preparedModel) {
+        return preparedModel.configureExecutionBurst();
+    };
+    return protect(*this, fn);
+}
+
 }  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/test/MockBuffer.h b/neuralnetworks/utils/common/test/MockBuffer.h
new file mode 100644
index 0000000..c5405fb
--- /dev/null
+++ b/neuralnetworks/utils/common/test/MockBuffer.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_BUFFER
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_BUFFER
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/Types.h>
+
+namespace android::nn {
+
+class MockBuffer final : public IBuffer {
+  public:
+    MOCK_METHOD(Request::MemoryDomainToken, getToken, (), (const, override));
+    MOCK_METHOD(GeneralResult<void>, copyTo, (const Memory& dst), (const, override));
+    MOCK_METHOD(GeneralResult<void>, copyFrom, (const Memory& src, const Dimensions& dimensions),
+                (const, override));
+};
+
+}  // namespace android::nn
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_BUFFER
diff --git a/neuralnetworks/utils/common/test/MockDevice.h b/neuralnetworks/utils/common/test/MockDevice.h
new file mode 100644
index 0000000..5566968
--- /dev/null
+++ b/neuralnetworks/utils/common/test/MockDevice.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_DEVICE
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_DEVICE
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IDevice.h>
+
+namespace android::nn {
+
+class MockDevice final : public IDevice {
+  public:
+    MOCK_METHOD(const std::string&, getName, (), (const, override));
+    MOCK_METHOD(const std::string&, getVersionString, (), (const, override));
+    MOCK_METHOD(Version, getFeatureLevel, (), (const, override));
+    MOCK_METHOD(DeviceType, getType, (), (const, override));
+    MOCK_METHOD(bool, isUpdatable, (), (const, override));
+    MOCK_METHOD(const std::vector<Extension>&, getSupportedExtensions, (), (const, override));
+    MOCK_METHOD(const Capabilities&, getCapabilities, (), (const, override));
+    MOCK_METHOD((std::pair<uint32_t, uint32_t>), getNumberOfCacheFilesNeeded, (),
+                (const, override));
+    MOCK_METHOD(GeneralResult<void>, wait, (), (const, override));
+    MOCK_METHOD(GeneralResult<std::vector<bool>>, getSupportedOperations, (const Model& model),
+                (const, override));
+    MOCK_METHOD(GeneralResult<SharedPreparedModel>, prepareModel,
+                (const Model& model, ExecutionPreference preference, Priority priority,
+                 OptionalTimePoint deadline, const std::vector<SharedHandle>& modelCache,
+                 const std::vector<SharedHandle>& dataCache, const CacheToken& token),
+                (const, override));
+    MOCK_METHOD(GeneralResult<SharedPreparedModel>, prepareModelFromCache,
+                (OptionalTimePoint deadline, const std::vector<SharedHandle>& modelCache,
+                 const std::vector<SharedHandle>& dataCache, const CacheToken& token),
+                (const, override));
+    MOCK_METHOD(GeneralResult<SharedBuffer>, allocate,
+                (const BufferDesc& desc, const std::vector<SharedPreparedModel>& preparedModels,
+                 const std::vector<BufferRole>& inputRoles,
+                 const std::vector<BufferRole>& outputRoles),
+                (const, override));
+};
+
+}  // namespace android::nn
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_DEVICE
diff --git a/neuralnetworks/utils/common/test/MockPreparedModel.h b/neuralnetworks/utils/common/test/MockPreparedModel.h
new file mode 100644
index 0000000..418af61
--- /dev/null
+++ b/neuralnetworks/utils/common/test/MockPreparedModel.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_PREPARED_MODEL
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_PREPARED_MODEL
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <nnapi/IPreparedModel.h>
+
+namespace android::nn {
+
+class MockPreparedModel final : public IPreparedModel {
+  public:
+    MOCK_METHOD((ExecutionResult<std::pair<std::vector<OutputShape>, Timing>>), execute,
+                (const Request& request, MeasureTiming measure, const OptionalTimePoint& deadline,
+                 const OptionalDuration& loopTimeoutDuration),
+                (const, override));
+    MOCK_METHOD((GeneralResult<std::pair<SyncFence, ExecuteFencedInfoCallback>>), executeFenced,
+                (const Request& request, const std::vector<SyncFence>& waitFor,
+                 MeasureTiming measure, const OptionalTimePoint& deadline,
+                 const OptionalDuration& loopTimeoutDuration,
+                 const OptionalDuration& timeoutDurationAfterFence),
+                (const, override));
+    MOCK_METHOD(GeneralResult<SharedBurst>, configureExecutionBurst, (), (const, override));
+    MOCK_METHOD(std::any, getUnderlyingResource, (), (const, override));
+};
+
+}  // namespace android::nn
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_TEST_MOCK_PREPARED_MODEL
diff --git a/neuralnetworks/utils/common/test/ResilientBufferTest.cpp b/neuralnetworks/utils/common/test/ResilientBufferTest.cpp
new file mode 100644
index 0000000..deb9b7c
--- /dev/null
+++ b/neuralnetworks/utils/common/test/ResilientBufferTest.cpp
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gmock/gmock.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientBuffer.h>
+#include <tuple>
+#include <utility>
+#include "MockBuffer.h"
+
+namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::InvokeWithoutArgs;
+using ::testing::Return;
+
+constexpr auto kToken = nn::Request::MemoryDomainToken{1};
+
+using SharedMockBuffer = std::shared_ptr<const nn::MockBuffer>;
+using MockBufferFactory = ::testing::MockFunction<nn::GeneralResult<nn::SharedBuffer>()>;
+
+SharedMockBuffer createConfiguredMockBuffer() {
+    return std::make_shared<const nn::MockBuffer>();
+}
+
+std::tuple<std::shared_ptr<const nn::MockBuffer>, std::unique_ptr<MockBufferFactory>,
+           std::shared_ptr<const ResilientBuffer>>
+setup() {
+    auto mockBuffer = std::make_shared<const nn::MockBuffer>();
+
+    auto mockBufferFactory = std::make_unique<MockBufferFactory>();
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(Return(mockBuffer));
+
+    auto buffer = ResilientBuffer::create(mockBufferFactory->AsStdFunction()).value();
+    return std::make_tuple(std::move(mockBuffer), std::move(mockBufferFactory), std::move(buffer));
+}
+
+constexpr auto makeError = [](nn::ErrorStatus status) {
+    return [status](const auto&... /*args*/) { return nn::error(status); };
+};
+const auto kReturnGeneralFailure = makeError(nn::ErrorStatus::GENERAL_FAILURE);
+const auto kReturnDeadObject = makeError(nn::ErrorStatus::DEAD_OBJECT);
+
+const auto kNoError = nn::GeneralResult<void>{};
+
+}  // namespace
+
+TEST(ResilientBufferTest, invalidBufferFactory) {
+    // setup call
+    const auto invalidBufferFactory = ResilientBuffer::Factory{};
+
+    // run test
+    const auto result = ResilientBuffer::create(invalidBufferFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(ResilientBufferTest, bufferFactoryFailure) {
+    // setup call
+    const auto invalidBufferFactory = kReturnGeneralFailure;
+
+    // run test
+    const auto result = ResilientBuffer::create(invalidBufferFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientBufferTest, getBuffer) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+
+    // run test
+    const auto result = buffer->getBuffer();
+
+    // verify result
+    EXPECT_TRUE(result == mockBuffer);
+}
+
+TEST(ResilientBufferTest, getToken) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, getToken()).Times(1).WillOnce(Return(kToken));
+
+    // run test
+    const auto token = buffer->getToken();
+
+    // verify result
+    EXPECT_EQ(token, kToken);
+}
+
+TEST(ResilientBufferTest, copyTo) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(Return(kNoError));
+
+    // run test
+    const auto result = buffer->copyTo({});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientBufferTest, copyToError) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = buffer->copyTo({});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientBufferTest, copyToDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = buffer->copyTo({});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientBufferTest, copyToDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyTo(_)).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockBuffer = createConfiguredMockBuffer();
+    EXPECT_CALL(*recoveredMockBuffer, copyTo(_)).Times(1).WillOnce(Return(kNoError));
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(Return(recoveredMockBuffer));
+
+    // run test
+    const auto result = buffer->copyTo({});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientBufferTest, copyFrom) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(Return(kNoError));
+
+    // run test
+    const auto result = buffer->copyFrom({}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientBufferTest, copyFromError) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = buffer->copyFrom({}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientBufferTest, copyFromDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = buffer->copyFrom({}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientBufferTest, copyFromDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    EXPECT_CALL(*mockBuffer, copyFrom(_, _)).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockBuffer = createConfiguredMockBuffer();
+    EXPECT_CALL(*recoveredMockBuffer, copyFrom(_, _)).Times(1).WillOnce(Return(kNoError));
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(Return(recoveredMockBuffer));
+
+    // run test
+    const auto result = buffer->copyFrom({}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientBufferTest, recover) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    const auto recoveredMockBuffer = createConfiguredMockBuffer();
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(Return(recoveredMockBuffer));
+
+    // run test
+    const auto result = buffer->recover(mockBuffer.get());
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockBuffer);
+}
+
+TEST(ResilientBufferTest, recoverFailure) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    const auto recoveredMockBuffer = createConfiguredMockBuffer();
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = buffer->recover(mockBuffer.get());
+
+    // verify result
+    EXPECT_FALSE(result.has_value());
+}
+
+TEST(ResilientBufferTest, someoneElseRecovered) {
+    // setup call
+    const auto [mockBuffer, mockBufferFactory, buffer] = setup();
+    const auto recoveredMockBuffer = createConfiguredMockBuffer();
+    EXPECT_CALL(*mockBufferFactory, Call()).Times(1).WillOnce(Return(recoveredMockBuffer));
+    buffer->recover(mockBuffer.get());
+
+    // run test
+    const auto result = buffer->recover(mockBuffer.get());
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockBuffer);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/test/ResilientDeviceTest.cpp b/neuralnetworks/utils/common/test/ResilientDeviceTest.cpp
new file mode 100644
index 0000000..3abd724
--- /dev/null
+++ b/neuralnetworks/utils/common/test/ResilientDeviceTest.cpp
@@ -0,0 +1,725 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gmock/gmock.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientDevice.h>
+#include <tuple>
+#include <utility>
+#include "MockBuffer.h"
+#include "MockDevice.h"
+#include "MockPreparedModel.h"
+
+namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::InvokeWithoutArgs;
+using ::testing::Return;
+
+using SharedMockDevice = std::shared_ptr<const nn::MockDevice>;
+using MockDeviceFactory = ::testing::MockFunction<nn::GeneralResult<nn::SharedDevice>(bool)>;
+
+const std::string kName = "Google-MockV1";
+const std::string kVersionString = "version1";
+const auto kExtensions = std::vector<nn::Extension>{};
+constexpr auto kNoInfo = std::numeric_limits<float>::max();
+constexpr auto kNoPerformanceInfo =
+        nn::Capabilities::PerformanceInfo{.execTime = kNoInfo, .powerUsage = kNoInfo};
+const auto kCapabilities = nn::Capabilities{
+        .relaxedFloat32toFloat16PerformanceScalar = kNoPerformanceInfo,
+        .relaxedFloat32toFloat16PerformanceTensor = kNoPerformanceInfo,
+        .operandPerformance = nn::Capabilities::OperandPerformanceTable::create({}).value(),
+        .ifPerformance = kNoPerformanceInfo,
+        .whilePerformance = kNoPerformanceInfo};
+constexpr auto kNumberOfCacheFilesNeeded = std::pair<uint32_t, uint32_t>(5, 3);
+
+SharedMockDevice createConfiguredMockDevice() {
+    auto mockDevice = std::make_shared<const nn::MockDevice>();
+
+    // Setup default actions for each relevant call.
+    constexpr auto getName_ret = []() -> const std::string& { return kName; };
+    constexpr auto getVersionString_ret = []() -> const std::string& { return kVersionString; };
+    constexpr auto kFeatureLevel = nn::Version::ANDROID_OC_MR1;
+    constexpr auto kDeviceType = nn::DeviceType::ACCELERATOR;
+    constexpr auto getSupportedExtensions_ret = []() -> const std::vector<nn::Extension>& {
+        return kExtensions;
+    };
+    constexpr auto getCapabilities_ret = []() -> const nn::Capabilities& { return kCapabilities; };
+
+    // Setup default actions for each relevant call.
+    ON_CALL(*mockDevice, getName()).WillByDefault(getName_ret);
+    ON_CALL(*mockDevice, getVersionString()).WillByDefault(getVersionString_ret);
+    ON_CALL(*mockDevice, getFeatureLevel()).WillByDefault(Return(kFeatureLevel));
+    ON_CALL(*mockDevice, getType()).WillByDefault(Return(kDeviceType));
+    ON_CALL(*mockDevice, getSupportedExtensions()).WillByDefault(getSupportedExtensions_ret);
+    ON_CALL(*mockDevice, getCapabilities()).WillByDefault(getCapabilities_ret);
+    ON_CALL(*mockDevice, getNumberOfCacheFilesNeeded())
+            .WillByDefault(Return(kNumberOfCacheFilesNeeded));
+
+    // These EXPECT_CALL(...).Times(testing::AnyNumber()) calls are to suppress warnings on the
+    // uninteresting methods calls.
+    EXPECT_CALL(*mockDevice, getName()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getVersionString()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getFeatureLevel()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getType()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getSupportedExtensions()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getCapabilities()).Times(testing::AnyNumber());
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded()).Times(testing::AnyNumber());
+
+    return mockDevice;
+}
+
+std::tuple<SharedMockDevice, std::unique_ptr<MockDeviceFactory>,
+           std::shared_ptr<const ResilientDevice>>
+setup() {
+    auto mockDevice = createConfiguredMockDevice();
+
+    auto mockDeviceFactory = std::make_unique<MockDeviceFactory>();
+    EXPECT_CALL(*mockDeviceFactory, Call(true)).Times(1).WillOnce(Return(mockDevice));
+
+    auto device = ResilientDevice::create(mockDeviceFactory->AsStdFunction()).value();
+    return std::make_tuple(std::move(mockDevice), std::move(mockDeviceFactory), std::move(device));
+}
+
+constexpr auto makeError = [](nn::ErrorStatus status) {
+    return [status](const auto&... /*args*/) { return nn::error(status); };
+};
+const auto kReturnGeneralFailure = makeError(nn::ErrorStatus::GENERAL_FAILURE);
+const auto kReturnDeadObject = makeError(nn::ErrorStatus::DEAD_OBJECT);
+
+}  // namespace
+
+TEST(ResilientDeviceTest, invalidDeviceFactory) {
+    // setup call
+    const auto invalidDeviceFactory = ResilientDevice::Factory{};
+
+    // run test
+    const auto result = ResilientDevice::create(invalidDeviceFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(ResilientDeviceTest, preparedModelFactoryFailure) {
+    // setup call
+    const auto invalidDeviceFactory = kReturnGeneralFailure;
+
+    // run test
+    const auto result = ResilientDevice::create(invalidDeviceFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, cachedData) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+
+    // run test and verify results
+    EXPECT_EQ(device->getName(), kName);
+    EXPECT_EQ(device->getVersionString(), kVersionString);
+    EXPECT_EQ(device->getSupportedExtensions(), kExtensions);
+    EXPECT_EQ(device->getCapabilities(), kCapabilities);
+}
+
+TEST(ResilientDeviceTest, getFeatureLevel) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    constexpr auto kFeatureLevel = nn::Version::ANDROID_OC_MR1;
+    EXPECT_CALL(*mockDevice, getFeatureLevel()).Times(1).WillOnce(Return(kFeatureLevel));
+
+    // run test
+    const auto featureLevel = device->getFeatureLevel();
+
+    // verify results
+    EXPECT_EQ(featureLevel, kFeatureLevel);
+}
+
+TEST(ResilientDeviceTest, getType) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    constexpr auto kDeviceType = nn::DeviceType::ACCELERATOR;
+    EXPECT_CALL(*mockDevice, getType()).Times(1).WillOnce(Return(kDeviceType));
+
+    // run test
+    const auto type = device->getType();
+
+    // verify results
+    EXPECT_EQ(type, kDeviceType);
+}
+
+TEST(ResilientDeviceTest, getNumberOfCacheFilesNeeded) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, getNumberOfCacheFilesNeeded())
+            .Times(1)
+            .WillOnce(Return(kNumberOfCacheFilesNeeded));
+
+    // run test
+    const auto numberOfCacheFilesNeeded = device->getNumberOfCacheFilesNeeded();
+
+    // verify results
+    EXPECT_EQ(numberOfCacheFilesNeeded, kNumberOfCacheFilesNeeded);
+}
+
+TEST(ResilientDeviceTest, getDevice) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+
+    // run test
+    const auto result = device->getDevice();
+
+    // verify result
+    EXPECT_TRUE(result == mockDevice);
+}
+
+TEST(ResilientDeviceTest, wait) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, wait()).Times(1).WillOnce(Return(nn::GeneralResult<void>{}));
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, waitError) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, wait()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, waitDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, wait()).Times(1).WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockDeviceFactory, Call(true)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientDeviceTest, waitDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, wait()).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, wait()).Times(1).WillOnce(Return(nn::GeneralResult<void>{}));
+    EXPECT_CALL(*mockDeviceFactory, Call(true)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->wait();
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, getSupportedOperations) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_))
+            .Times(1)
+            .WillOnce(Return(nn::GeneralResult<std::vector<bool>>{}));
+
+    // run test
+    const auto result = device->getSupportedOperations({});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, getSupportedOperationsError) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->getSupportedOperations({});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, getSupportedOperationsDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_)).Times(1).WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->getSupportedOperations({});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientDeviceTest, getSupportedOperationsDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, getSupportedOperations(_)).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getSupportedOperations(_))
+            .Times(1)
+            .WillOnce(Return(nn::GeneralResult<std::vector<bool>>{}));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->getSupportedOperations({});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, prepareModel) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto mockPreparedModel = std::make_shared<const nn::MockPreparedModel>();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Return(mockPreparedModel));
+
+    // run test
+    const auto result = device->prepareModel({}, {}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, prepareModelError) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->prepareModel({}, {}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, prepareModelDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->prepareModel({}, {}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientDeviceTest, prepareModelDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModel(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const auto mockPreparedModel = std::make_shared<const nn::MockPreparedModel>();
+    EXPECT_CALL(*recoveredMockDevice, prepareModel(_, _, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Return(mockPreparedModel));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->prepareModel({}, {}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, prepareModelFromCache) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto mockPreparedModel = std::make_shared<const nn::MockPreparedModel>();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(Return(mockPreparedModel));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, prepareModelFromCacheError) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, prepareModelFromCacheDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientDeviceTest, prepareModelFromCacheDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const auto mockPreparedModel = std::make_shared<const nn::MockPreparedModel>();
+    EXPECT_CALL(*recoveredMockDevice, prepareModelFromCache(_, _, _, _))
+            .Times(1)
+            .WillOnce(Return(mockPreparedModel));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, allocate) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto mockBuffer = std::make_shared<const nn::MockBuffer>();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _)).Times(1).WillOnce(Return(mockBuffer));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, allocateError) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientDeviceTest, allocateDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _)).Times(1).WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientDeviceTest, allocateDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    EXPECT_CALL(*mockDevice, allocate(_, _, _, _)).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const auto mockBuffer = std::make_shared<const nn::MockBuffer>();
+    EXPECT_CALL(*recoveredMockDevice, allocate(_, _, _, _)).Times(1).WillOnce(Return(mockBuffer));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientDeviceTest, recover) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverFailure) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*mockDeviceFactory, Call(_)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    EXPECT_FALSE(result.has_value());
+}
+
+TEST(ResilientDeviceTest, someoneElseRecovered) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+    device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetName) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const std::string kDifferentName = "Google-DifferentName";
+    const auto ret = [&kDifferentName]() -> const std::string& { return kDifferentName; };
+    EXPECT_CALL(*recoveredMockDevice, getName()).Times(1).WillOnce(ret);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetVersionString) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const std::string kDifferentVersionString = "differentversion";
+    const auto ret = [&kDifferentVersionString]() -> const std::string& {
+        return kDifferentVersionString;
+    };
+    EXPECT_CALL(*recoveredMockDevice, getVersionString()).Times(1).WillOnce(ret);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetFeatureLevel) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getFeatureLevel())
+            .Times(1)
+            .WillOnce(Return(nn::Version::ANDROID_P));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetType) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getType()).Times(1).WillOnce(Return(nn::DeviceType::GPU));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetSupportedExtensions) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const auto kDifferentExtensions =
+            std::vector<nn::Extension>{nn::Extension{.name = "", .operandTypes = {}}};
+    const auto ret = [&kDifferentExtensions]() -> const std::vector<nn::Extension>& {
+        return kDifferentExtensions;
+    };
+    EXPECT_CALL(*recoveredMockDevice, getSupportedExtensions()).Times(1).WillOnce(ret);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchGetCapabilities) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    const auto kDifferentCapabilities = nn::Capabilities{
+            .relaxedFloat32toFloat16PerformanceTensor = {.execTime = 0.5f, .powerUsage = 0.5f},
+            .operandPerformance = nn::Capabilities::OperandPerformanceTable::create({}).value()};
+    const auto ret = [&kDifferentCapabilities]() -> const nn::Capabilities& {
+        return kDifferentCapabilities;
+    };
+    EXPECT_CALL(*recoveredMockDevice, getCapabilities()).Times(1).WillOnce(ret);
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+
+    // run test
+    const auto result = device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+    EXPECT_TRUE(result.value() != mockDevice);
+    EXPECT_TRUE(result.value() != recoveredMockDevice);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchInvalidPrepareModel) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getType()).Times(1).WillOnce(Return(nn::DeviceType::GPU));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+    device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // run test
+    auto result = device->prepareModel({}, {}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchInvalidPrepareModelFromCache) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getType()).Times(1).WillOnce(Return(nn::DeviceType::GPU));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+    device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // run test
+    auto result = device->prepareModelFromCache({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+}
+
+TEST(ResilientDeviceTest, recoverCacheMismatchInvalidAllocate) {
+    // setup call
+    const auto [mockDevice, mockDeviceFactory, device] = setup();
+    const auto recoveredMockDevice = createConfiguredMockDevice();
+    EXPECT_CALL(*recoveredMockDevice, getType()).Times(1).WillOnce(Return(nn::DeviceType::GPU));
+    EXPECT_CALL(*mockDeviceFactory, Call(false)).Times(1).WillOnce(Return(recoveredMockDevice));
+    device->recover(mockDevice.get(), /*blocking=*/false);
+
+    // run test
+    auto result = device->allocate({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() != nullptr);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/test/ResilientPreparedModelTest.cpp b/neuralnetworks/utils/common/test/ResilientPreparedModelTest.cpp
new file mode 100644
index 0000000..6d86e10
--- /dev/null
+++ b/neuralnetworks/utils/common/test/ResilientPreparedModelTest.cpp
@@ -0,0 +1,297 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gmock/gmock.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientPreparedModel.h>
+#include <utility>
+#include "MockPreparedModel.h"
+
+namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+using ::testing::_;
+using ::testing::InvokeWithoutArgs;
+using ::testing::Return;
+
+using SharedMockPreparedModel = std::shared_ptr<const nn::MockPreparedModel>;
+using MockPreparedModelFactory =
+        ::testing::MockFunction<nn::GeneralResult<nn::SharedPreparedModel>()>;
+
+SharedMockPreparedModel createConfiguredMockPreparedModel() {
+    return std::make_shared<const nn::MockPreparedModel>();
+}
+
+std::tuple<std::shared_ptr<const nn::MockPreparedModel>, std::unique_ptr<MockPreparedModelFactory>,
+           std::shared_ptr<const ResilientPreparedModel>>
+setup() {
+    auto mockPreparedModel = std::make_shared<const nn::MockPreparedModel>();
+
+    auto mockPreparedModelFactory = std::make_unique<MockPreparedModelFactory>();
+    EXPECT_CALL(*mockPreparedModelFactory, Call()).Times(1).WillOnce(Return(mockPreparedModel));
+
+    auto buffer = ResilientPreparedModel::create(mockPreparedModelFactory->AsStdFunction()).value();
+    return std::make_tuple(std::move(mockPreparedModel), std::move(mockPreparedModelFactory),
+                           std::move(buffer));
+}
+
+constexpr auto makeError = [](nn::ErrorStatus status) {
+    return [status](const auto&... /*args*/) { return nn::error(status); };
+};
+const auto kReturnGeneralFailure = makeError(nn::ErrorStatus::GENERAL_FAILURE);
+const auto kReturnDeadObject = makeError(nn::ErrorStatus::DEAD_OBJECT);
+
+const auto kNoExecutionError =
+        nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>{};
+const auto kNoFencedExecutionError =
+        nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>(
+                std::make_pair(nn::SyncFence::createAsSignaled(), nullptr));
+
+struct FakeResource {};
+
+}  // namespace
+
+TEST(ResilientPreparedModelTest, invalidPreparedModelFactory) {
+    // setup call
+    const auto invalidPreparedModelFactory = ResilientPreparedModel::Factory{};
+
+    // run test
+    const auto result = ResilientPreparedModel::create(invalidPreparedModelFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::INVALID_ARGUMENT);
+}
+
+TEST(ResilientPreparedModelTest, preparedModelFactoryFailure) {
+    // setup call
+    const auto invalidPreparedModelFactory = kReturnGeneralFailure;
+
+    // run test
+    const auto result = ResilientPreparedModel::create(invalidPreparedModelFactory);
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientPreparedModelTest, getPreparedModel) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+
+    // run test
+    const auto result = preparedModel->getPreparedModel();
+
+    // verify result
+    EXPECT_TRUE(result == mockPreparedModel);
+}
+
+TEST(ResilientPreparedModelTest, execute) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _, _, _))
+            .Times(1)
+            .WillOnce(Return(kNoExecutionError));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientPreparedModelTest, executeError) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _, _, _)).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientPreparedModelTest, executeDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _, _, _)).Times(1).WillOnce(kReturnDeadObject);
+    constexpr auto ret = [] { return nn::error(nn::ErrorStatus::GENERAL_FAILURE); };
+    EXPECT_CALL(*mockPreparedModelFactory, Call()).Times(1).WillOnce(ret);
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientPreparedModelTest, executeDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, execute(_, _, _, _)).Times(1).WillOnce(kReturnDeadObject);
+    const auto recoveredMockPreparedModel = createConfiguredMockPreparedModel();
+    EXPECT_CALL(*recoveredMockPreparedModel, execute(_, _, _, _))
+            .Times(1)
+            .WillOnce(Return(kNoExecutionError));
+    EXPECT_CALL(*mockPreparedModelFactory, Call())
+            .Times(1)
+            .WillOnce(Return(recoveredMockPreparedModel));
+
+    // run test
+    const auto result = preparedModel->execute({}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientPreparedModelTest, executeFenced) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Return(kNoFencedExecutionError));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientPreparedModelTest, executeFencedError) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::GENERAL_FAILURE);
+}
+
+TEST(ResilientPreparedModelTest, executeFencedDeadObjectFailedRecovery) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    EXPECT_CALL(*mockPreparedModelFactory, Call()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_FALSE(result.has_value());
+    EXPECT_EQ(result.error().code, nn::ErrorStatus::DEAD_OBJECT);
+}
+
+TEST(ResilientPreparedModelTest, executeFencedDeadObjectSuccessfulRecovery) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, executeFenced(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(kReturnDeadObject);
+    const auto recoveredMockPreparedModel = createConfiguredMockPreparedModel();
+    EXPECT_CALL(*recoveredMockPreparedModel, executeFenced(_, _, _, _, _, _))
+            .Times(1)
+            .WillOnce(Return(kNoFencedExecutionError));
+    EXPECT_CALL(*mockPreparedModelFactory, Call())
+            .Times(1)
+            .WillOnce(Return(recoveredMockPreparedModel));
+
+    // run test
+    const auto result = preparedModel->executeFenced({}, {}, {}, {}, {}, {});
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+}
+
+TEST(ResilientPreparedModelTest, getUnderlyingResource) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    EXPECT_CALL(*mockPreparedModel, getUnderlyingResource())
+            .Times(1)
+            .WillOnce(Return(FakeResource{}));
+
+    // run test
+    const auto resource = preparedModel->getUnderlyingResource();
+
+    // verify resource
+    const FakeResource* maybeFakeResource = std::any_cast<FakeResource>(&resource);
+    EXPECT_NE(maybeFakeResource, nullptr);
+}
+
+TEST(ResilientPreparedModelTest, recover) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    const auto recoveredMockPreparedModel = createConfiguredMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModelFactory, Call())
+            .Times(1)
+            .WillOnce(Return(recoveredMockPreparedModel));
+
+    // run test
+    const auto result = preparedModel->recover(mockPreparedModel.get());
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockPreparedModel);
+}
+
+TEST(ResilientPreparedModelTest, recoverFailure) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    const auto recoveredMockPreparedModel = createConfiguredMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModelFactory, Call()).Times(1).WillOnce(kReturnGeneralFailure);
+
+    // run test
+    const auto result = preparedModel->recover(mockPreparedModel.get());
+
+    // verify result
+    EXPECT_FALSE(result.has_value());
+}
+
+TEST(ResilientPreparedModelTest, someoneElseRecovered) {
+    // setup call
+    const auto [mockPreparedModel, mockPreparedModelFactory, preparedModel] = setup();
+    const auto recoveredMockPreparedModel = createConfiguredMockPreparedModel();
+    EXPECT_CALL(*mockPreparedModelFactory, Call())
+            .Times(1)
+            .WillOnce(Return(recoveredMockPreparedModel));
+    preparedModel->recover(mockPreparedModel.get());
+
+    // run test
+    const auto result = preparedModel->recover(mockPreparedModel.get());
+
+    // verify result
+    ASSERT_TRUE(result.has_value())
+            << "Failed with " << result.error().code << ": " << result.error().message;
+    EXPECT_TRUE(result.value() == recoveredMockPreparedModel);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/oemlock/aidl/Android.bp b/oemlock/aidl/Android.bp
new file mode 100644
index 0000000..bfc99e7
--- /dev/null
+++ b/oemlock/aidl/Android.bp
@@ -0,0 +1,16 @@
+aidl_interface {
+    name: "android.hardware.oemlock",
+    vendor_available: true,
+    srcs: ["android/hardware/oemlock/*.aidl"],
+    stability: "vintf",
+    backend: {
+        java: {
+            platform_apis: true,
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+    },
+}
diff --git a/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/IOemLock.aidl b/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/IOemLock.aidl
new file mode 100644
index 0000000..e3c974d
--- /dev/null
+++ b/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/IOemLock.aidl
@@ -0,0 +1,27 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.oemlock;
+@VintfStability
+interface IOemLock {
+  String getName();
+  boolean isOemUnlockAllowedByCarrier();
+  boolean isOemUnlockAllowedByDevice();
+  android.hardware.oemlock.OemLockSecureStatus setOemUnlockAllowedByCarrier(in boolean allowed, in byte[] signature);
+  void setOemUnlockAllowedByDevice(in boolean allowed);
+}
diff --git a/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/OemLockSecureStatus.aidl b/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/OemLockSecureStatus.aidl
new file mode 100644
index 0000000..9d1327d
--- /dev/null
+++ b/oemlock/aidl/aidl_api/android.hardware.oemlock/current/android/hardware/oemlock/OemLockSecureStatus.aidl
@@ -0,0 +1,25 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.oemlock;
+@Backing(type="int") @VintfStability
+enum OemLockSecureStatus {
+  OK = 0,
+  FAILED = 1,
+  INVALID_SIGNATURE = 2,
+}
diff --git a/oemlock/aidl/android/hardware/oemlock/IOemLock.aidl b/oemlock/aidl/android/hardware/oemlock/IOemLock.aidl
new file mode 100644
index 0000000..674ff85
--- /dev/null
+++ b/oemlock/aidl/android/hardware/oemlock/IOemLock.aidl
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.oemlock;
+
+import android.hardware.oemlock.OemLockSecureStatus;
+
+/*
+ * The OEM lock prevents the bootloader from allowing the device to be flashed.
+ *
+ * Both the carrier and the device itself have a say as to whether OEM unlock is
+ * allowed and both must agree that is allowed in order for unlock to be
+ * possible.
+ */
+@VintfStability
+interface IOemLock {
+    /**
+     * Returns a vendor specific identifier of the HAL.
+     *
+     * The name returned must not be interpreted by the framework but must be
+     * passed to vendor code which may use it to identify the security protocol
+     * used by setOemUnlockAllowedByCarrier. This allows the vendor to identify
+     * the protocol without having to maintain a device-to-protocol mapping.
+     *
+     * @return name of the implementation and STATUS_OK if get name successfully
+     */
+    String getName();
+
+    /**
+     * Returns whether OEM unlock is allowed by the carrier.
+     *
+     * @return the current state(allowed/not allowed) of the flag
+     * and STATUS_OK if the flag was successfully read.
+     */
+    boolean isOemUnlockAllowedByCarrier();
+
+    /**
+     * Returns whether OEM unlock ia allowed by the device.
+     *
+     * @return the current state(allowed/not allowed) of the flag
+     * and STATUS_OK if the flag was successfully read.
+     */
+    boolean isOemUnlockAllowedByDevice();
+
+    /**
+     * Updates whether OEM unlock is allowed by the carrier.
+     *
+     * The implementation may require a vendor defined signature to prove the
+     * validity of this request in order to harden its security.
+     *
+     * @param allowed is the new value of the flag.
+     * @param signature to prove validity of this request or empty if not
+     *        required.
+     * @return OK if the flag was successfully updated,
+     *         INVALID_SIGNATURE if a signature is required but the wrong one
+     *         was provided
+     *         FAILED if the update was otherwise unsuccessful.
+     */
+    OemLockSecureStatus setOemUnlockAllowedByCarrier(in boolean allowed, in byte[] signature);
+
+    /**
+     * Updates whether OEM unlock is allowed by the device.
+     *
+     * @param allowed the new value of the flag.
+     * @return STATUS_OK if the flag was successfully updated.
+     */
+    void setOemUnlockAllowedByDevice(in boolean allowed);
+}
diff --git a/oemlock/aidl/android/hardware/oemlock/OemLockSecureStatus.aidl b/oemlock/aidl/android/hardware/oemlock/OemLockSecureStatus.aidl
new file mode 100644
index 0000000..3c11377
--- /dev/null
+++ b/oemlock/aidl/android/hardware/oemlock/OemLockSecureStatus.aidl
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.oemlock;
+
+@VintfStability
+@Backing(type="int")
+enum OemLockSecureStatus {
+    /**
+     * The operation completed successfully.
+     */
+    OK,
+    /**
+     * The operation encountered a problem.
+     */
+    FAILED,
+    /**
+     * An invalid signature was provided so the operation was not performed.
+     */
+    INVALID_SIGNATURE,
+}
diff --git a/oemlock/aidl/default/Android.bp b/oemlock/aidl/default/Android.bp
new file mode 100644
index 0000000..b9872d7
--- /dev/null
+++ b/oemlock/aidl/default/Android.bp
@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_binary {
+    name: "android.hardware.oemlock-service.example",
+    relative_install_path: "hw",
+    init_rc: ["android.hardware.oemlock-service.example.rc"],
+    vintf_fragments: ["android.hardware.oemlock-service.example.xml"],
+    vendor: true,
+    srcs: [
+        "service.cpp",
+        "OemLock.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.oemlock-ndk_platform",
+        "libbase",
+        "libbinder_ndk",
+    ],
+}
diff --git a/oemlock/aidl/default/OemLock.cpp b/oemlock/aidl/default/OemLock.cpp
new file mode 100644
index 0000000..646b532
--- /dev/null
+++ b/oemlock/aidl/default/OemLock.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "OemLock.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace oemlock {
+
+// Methods from ::android::hardware::oemlock::IOemLock follow.
+
+::ndk::ScopedAStatus OemLock::getName(std::string *out_name) {
+    (void)out_name;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus OemLock::setOemUnlockAllowedByCarrier(bool in_allowed, const std::vector<uint8_t> &in_signature, OemLockSecureStatus *_aidl_return) {
+    (void)in_allowed;
+    (void)in_signature;
+    (void)_aidl_return;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus OemLock::isOemUnlockAllowedByCarrier(bool *out_allowed) {
+    (void)out_allowed;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus OemLock::setOemUnlockAllowedByDevice(bool in_allowed) {
+    (void)in_allowed;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus OemLock::isOemUnlockAllowedByDevice(bool *out_allowed) {
+    (void)out_allowed;
+    return ::ndk::ScopedAStatus::ok();
+}
+
+} // namespace oemlock
+} // namespace hardware
+} // namespace android
+} // aidl
diff --git a/oemlock/aidl/default/OemLock.h b/oemlock/aidl/default/OemLock.h
new file mode 100644
index 0000000..b0df414
--- /dev/null
+++ b/oemlock/aidl/default/OemLock.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/oemlock/BnOemLock.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace oemlock {
+
+using ::aidl::android::hardware::oemlock::IOemLock;
+using ::aidl::android::hardware::oemlock::OemLockSecureStatus;
+
+struct OemLock : public BnOemLock {
+public:
+    OemLock() = default;
+
+    // Methods from ::android::hardware::oemlock::IOemLock follow.
+    ::ndk::ScopedAStatus getName(std::string* out_name) override;
+    ::ndk::ScopedAStatus isOemUnlockAllowedByCarrier(bool* out_allowed) override;
+    ::ndk::ScopedAStatus isOemUnlockAllowedByDevice(bool* out_allowed) override;
+    ::ndk::ScopedAStatus setOemUnlockAllowedByCarrier(bool in_allowed, const std::vector<uint8_t>& in_signature, OemLockSecureStatus* _aidl_return) override;
+    ::ndk::ScopedAStatus setOemUnlockAllowedByDevice(bool in_allowed) override;
+};
+
+} // namespace oemlock
+} // namespace hardware
+} // namespace android
+} // aidl
diff --git a/oemlock/aidl/default/android.hardware.oemlock-service.example.rc b/oemlock/aidl/default/android.hardware.oemlock-service.example.rc
new file mode 100644
index 0000000..57b79d3
--- /dev/null
+++ b/oemlock/aidl/default/android.hardware.oemlock-service.example.rc
@@ -0,0 +1,4 @@
+service vendor.oemlock_default /vendor/bin/hw/android.hardware.oemlock-service.example
+    class hal
+    user hsm
+    group hsm
diff --git a/oemlock/aidl/default/android.hardware.oemlock-service.example.xml b/oemlock/aidl/default/android.hardware.oemlock-service.example.xml
new file mode 100644
index 0000000..b9f137f
--- /dev/null
+++ b/oemlock/aidl/default/android.hardware.oemlock-service.example.xml
@@ -0,0 +1,9 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.oemlock</name>
+        <interface>
+            <name>IOemLock</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>
diff --git a/oemlock/aidl/default/service.cpp b/oemlock/aidl/default/service.cpp
new file mode 100644
index 0000000..af828a0
--- /dev/null
+++ b/oemlock/aidl/default/service.cpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+#include "OemLock.h"
+
+using ::aidl::android::hardware::oemlock::OemLock;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<OemLock> oemlock = ndk::SharedRefBase::make<OemLock>();
+
+    const std::string instance = std::string() + OemLock::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(oemlock->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return -1; // Should never be reached
+}
diff --git a/oemlock/aidl/vts/Android.bp b/oemlock/aidl/vts/Android.bp
new file mode 100644
index 0000000..a13dbe2
--- /dev/null
+++ b/oemlock/aidl/vts/Android.bp
@@ -0,0 +1,33 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_test {
+    name: "VtsHalOemLockTargetTest",
+    defaults: [
+        "VtsHalTargetTestDefaults",
+        "use_libaidlvintf_gtest_helper_static",
+    ],
+    srcs: ["VtsHalOemLockTargetTest.cpp"],
+    shared_libs: [
+        "libbinder_ndk",
+        "libbase",
+    ],
+    static_libs: ["android.hardware.oemlock-ndk_platform"],
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+}
diff --git a/oemlock/aidl/vts/VtsHalOemLockTargetTest.cpp b/oemlock/aidl/vts/VtsHalOemLockTargetTest.cpp
new file mode 100644
index 0000000..6bf6298
--- /dev/null
+++ b/oemlock/aidl/vts/VtsHalOemLockTargetTest.cpp
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <aidl/Gtest.h>
+#include <aidl/Vintf.h>
+
+#include <aidl/android/hardware/oemlock/IOemLock.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::aidl::android::hardware::oemlock::IOemLock;
+using ::aidl::android::hardware::oemlock::OemLockSecureStatus;
+
+using ndk::SpAIBinder;
+
+struct OemLockAidlTest : public ::testing::TestWithParam<std::string> {
+    virtual void SetUp() override {
+        oemlock = IOemLock::fromBinder(
+            SpAIBinder(AServiceManager_waitForService(GetParam().c_str())));
+        ASSERT_NE(oemlock, nullptr);
+    }
+
+    virtual void TearDown() override {}
+
+    std::shared_ptr<IOemLock> oemlock;
+};
+
+/*
+ * Check the name can be retrieved
+ */
+TEST_P(OemLockAidlTest, GetName) {
+    std::string name;
+
+    const auto ret = oemlock->getName(&name);
+
+    ASSERT_TRUE(ret.isOk());
+    // Any value acceptable
+};
+
+/*
+ * Check the unlock allowed by device state can be queried
+ */
+TEST_P(OemLockAidlTest, QueryUnlockAllowedByDevice) {
+    bool allowed;
+
+    const auto ret = oemlock->isOemUnlockAllowedByDevice(&allowed);
+
+    ASSERT_TRUE(ret.isOk());
+    // Any value acceptable
+}
+
+/*
+ * Check unlock allowed by device state can be toggled
+ */
+TEST_P(OemLockAidlTest, AllowedByDeviceCanBeToggled) {
+    bool allowed;
+
+    // Get the original state so it can be restored
+    const auto get_ret = oemlock->isOemUnlockAllowedByDevice(&allowed);
+    ASSERT_TRUE(get_ret.isOk());
+    const bool originallyAllowed = allowed;
+
+    // Toggle the state
+    const auto set_ret = oemlock->setOemUnlockAllowedByDevice(!originallyAllowed);
+    ASSERT_TRUE(set_ret.isOk());
+
+    const auto check_set_ret = oemlock->isOemUnlockAllowedByDevice(&allowed);
+    ASSERT_TRUE(check_set_ret.isOk());
+    ASSERT_EQ(allowed, !originallyAllowed);
+
+    // Restore the state
+    const auto restore_ret = oemlock->setOemUnlockAllowedByDevice(originallyAllowed);
+    ASSERT_TRUE(restore_ret.isOk());
+
+    const auto check_restore_ret = oemlock->isOemUnlockAllowedByDevice(&allowed);
+    ASSERT_TRUE(check_restore_ret.isOk());
+    ASSERT_EQ(allowed, originallyAllowed);
+}
+
+/*
+ * Check the unlock allowed by device state can be queried
+ */
+TEST_P(OemLockAidlTest, QueryUnlockAllowedByCarrier) {
+    bool allowed;
+
+    const auto ret = oemlock->isOemUnlockAllowedByCarrier(&allowed);
+
+    ASSERT_TRUE(ret.isOk());
+    // Any value acceptable
+}
+
+/*
+ * Attempt to check unlock allowed by carrier can be toggled
+ *
+ * The implementation may involve a signature which cannot be tested here. That
+ * is a valid implementation so the test will pass. If there is no signature
+ * required, the test will toggle the value.
+ */
+TEST_P(OemLockAidlTest, CarrierUnlock) {
+    const std::vector<uint8_t> noSignature = {};
+    bool allowed;
+    OemLockSecureStatus secure_status;
+
+    // Get the original state so it can be restored
+    const auto get_ret = oemlock->isOemUnlockAllowedByCarrier(&allowed);
+    ASSERT_TRUE(get_ret.isOk());
+    const bool originallyAllowed = allowed;
+
+    if (originallyAllowed) {
+       // Only applied to locked devices
+       return;
+    }
+
+    // Toggle the state
+    const auto set_ret = oemlock->setOemUnlockAllowedByCarrier(!originallyAllowed, noSignature, &secure_status);
+    ASSERT_TRUE(set_ret.isOk());
+    ASSERT_NE(secure_status, OemLockSecureStatus::FAILED);
+    const auto set_status = secure_status;
+
+    const auto check_set_ret = oemlock->isOemUnlockAllowedByCarrier(&allowed);
+    ASSERT_TRUE(check_set_ret.isOk());
+
+    if (set_status == OemLockSecureStatus::INVALID_SIGNATURE) {
+       // Signature is required so we cannot toggle the value in the test, but this is allowed
+       ASSERT_EQ(allowed, originallyAllowed);
+       return;
+    }
+
+    ASSERT_EQ(set_status, OemLockSecureStatus::OK);
+    ASSERT_EQ(allowed, !originallyAllowed);
+
+    // Restore the state
+    const auto restore_ret = oemlock->setOemUnlockAllowedByCarrier(originallyAllowed, noSignature, &secure_status);
+    ASSERT_TRUE(restore_ret.isOk());
+    ASSERT_EQ(secure_status, OemLockSecureStatus::OK);
+
+    const auto check_restore_ret = oemlock->isOemUnlockAllowedByCarrier(&allowed);
+    ASSERT_TRUE(check_restore_ret.isOk());
+    ASSERT_EQ(allowed, originallyAllowed);
+}
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(OemLockAidlTest);
+INSTANTIATE_TEST_SUITE_P(
+        PerInstance, OemLockAidlTest,
+        testing::ValuesIn(android::getAidlHalInstanceNames(IOemLock::descriptor)),
+        android::PrintInstanceNameToString);
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    ABinderProcess_setThreadPoolMaxThreadCount(1);
+    ABinderProcess_startThreadPool();
+    return RUN_ALL_TESTS();
+}
diff --git a/radio/1.0/vts/functional/vts_test_util.h b/radio/1.0/vts/functional/vts_test_util.h
index 1625f11..218e823 100644
--- a/radio/1.0/vts/functional/vts_test_util.h
+++ b/radio/1.0/vts/functional/vts_test_util.h
@@ -35,6 +35,12 @@
 
 static constexpr const char* FEATURE_VOICE_CALL = "android.software.connectionservice";
 
+static constexpr const char* FEATURE_TELEPHONY = "android.hardware.telephony";
+
+static constexpr const char* FEATURE_TELEPHONY_GSM = "android.hardware.telephony.gsm";
+
+static constexpr const char* FEATURE_TELEPHONY_CDMA = "android.hardware.telephony.cdma";
+
 /*
  * Generate random serial number for radio test
  */
diff --git a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
index 1b254a1..b0b984c 100644
--- a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
+++ b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
@@ -34,6 +34,10 @@
     if (!deviceSupportsFeature(FEATURE_VOICE_CALL)) {
         ALOGI("Skipping emergencyDial because voice call is not supported in device");
         return;
+    } else if (!deviceSupportsFeature(FEATURE_TELEPHONY_GSM) &&
+               !deviceSupportsFeature(FEATURE_TELEPHONY_CDMA)) {
+        ALOGI("Skipping emergencyDial because gsm/cdma radio is not supported in device");
+        return;
     } else {
         ALOGI("Running emergencyDial because voice call is supported in device");
     }
@@ -86,6 +90,10 @@
     if (!deviceSupportsFeature(FEATURE_VOICE_CALL)) {
         ALOGI("Skipping emergencyDial because voice call is not supported in device");
         return;
+    } else if (!deviceSupportsFeature(FEATURE_TELEPHONY_GSM) &&
+               !deviceSupportsFeature(FEATURE_TELEPHONY_CDMA)) {
+        ALOGI("Skipping emergencyDial because gsm/cdma radio is not supported in device");
+        return;
     } else {
         ALOGI("Running emergencyDial because voice call is supported in device");
     }
@@ -138,6 +146,10 @@
     if (!deviceSupportsFeature(FEATURE_VOICE_CALL)) {
         ALOGI("Skipping emergencyDial because voice call is not supported in device");
         return;
+    } else if (!deviceSupportsFeature(FEATURE_TELEPHONY_GSM) &&
+               !deviceSupportsFeature(FEATURE_TELEPHONY_CDMA)) {
+        ALOGI("Skipping emergencyDial because gsm/cdma radio is not supported in device");
+        return;
     } else {
         ALOGI("Running emergencyDial because voice call is supported in device");
     }
diff --git a/radio/1.5/vts/functional/radio_hidl_hal_api.cpp b/radio/1.5/vts/functional/radio_hidl_hal_api.cpp
index 7166654..0b49b36 100644
--- a/radio/1.5/vts/functional/radio_hidl_hal_api.cpp
+++ b/radio/1.5/vts/functional/radio_hidl_hal_api.cpp
@@ -236,7 +236,12 @@
 
     ALOGI("setSignalStrengthReportingCriteria_1_5_NGRAN_SSRSRP, rspInfo.error = %s\n",
           toString(radioRsp_v1_5->rspInfo.error).c_str());
-    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error, {RadioError::NONE}));
+
+    // Allow REQUEST_NOT_SUPPORTED because some non-5G device may not support NGRAN for
+    // setSignalStrengthReportingCriteria_1_5()
+    ASSERT_TRUE(
+            CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error,
+                             {RadioError::NONE, RadioError::REQUEST_NOT_SUPPORTED}));
 }
 
 /*
@@ -261,7 +266,12 @@
 
     ALOGI("setSignalStrengthReportingCriteria_1_5_NGRAN_SSRSRQ, rspInfo.error = %s\n",
           toString(radioRsp_v1_5->rspInfo.error).c_str());
-    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error, {RadioError::NONE}));
+
+    // Allow REQUEST_NOT_SUPPORTED because some non-5G device may not support NGRAN for
+    // setSignalStrengthReportingCriteria_1_5()
+    ASSERT_TRUE(
+            CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error,
+                             {RadioError::NONE, RadioError::REQUEST_NOT_SUPPORTED}));
 }
 
 /*
@@ -307,7 +317,12 @@
 
     ALOGI("setSignalStrengthReportingCriteria_1_5_NGRAN_SSSINR, rspInfo.error = %s\n",
           toString(radioRsp_v1_5->rspInfo.error).c_str());
-    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error, {RadioError::NONE}));
+
+    // Allow REQUEST_NOT_SUPPORTED because some non-5G device may not support NGRAN for
+    // setSignalStrengthReportingCriteria_1_5()
+    ASSERT_TRUE(
+            CheckAnyOfErrors(radioRsp_v1_5->rspInfo.error,
+                             {RadioError::NONE, RadioError::REQUEST_NOT_SUPPORTED}));
 }
 
 /*
diff --git a/radio/1.6/IRadioIndication.hal b/radio/1.6/IRadioIndication.hal
index 1b56d40..a53d7c1 100644
--- a/radio/1.6/IRadioIndication.hal
+++ b/radio/1.6/IRadioIndication.hal
@@ -23,6 +23,7 @@
 import @1.6::NetworkScanResult;
 import @1.6::SignalStrength;
 import @1.6::SetupDataCallResult;
+import @1.6::PhysicalChannelConfig;
 
 /**
  * Interface declaring unsolicited radio indications.
@@ -101,4 +102,15 @@
      * CellInfo.
      */
     oneway networkScanResult_1_6(RadioIndicationType type, NetworkScanResult result);
+
+    /**
+     * Indicates physical channel configurations.
+     *
+     * An empty configs list indicates that the radio is in idle mode.
+     *
+     * @param type Type of radio indication
+     * @param configs Vector of PhysicalChannelConfigs
+     */
+    oneway currentPhysicalChannelConfigs_1_6(RadioIndicationType type,
+            vec<PhysicalChannelConfig> configs);
 };
diff --git a/radio/1.6/types.hal b/radio/1.6/types.hal
index f4dc0bd..6dd8315 100644
--- a/radio/1.6/types.hal
+++ b/radio/1.6/types.hal
@@ -23,7 +23,10 @@
 import @1.0::RadioError;
 import @1.0::RadioResponseType;
 import @1.0::RegState;
+import @1.1::EutranBands;
+import @1.1::GeranBands;
 import @1.1::ScanStatus;
+import @1.1::UtranBands;
 import @1.2::Call;
 import @1.2::CellInfoCdma;
 import @1.2::CellConnectionStatus;
@@ -41,6 +44,7 @@
 import @1.5::CellInfoWcdma;
 import @1.5::CellInfoTdscdma;
 import @1.5::LinkAddress;
+import @1.5::NgranBands;
 import @1.5::RegStateResult.AccessTechnologySpecificInfo.Cdma2000RegistrationInfo;
 import @1.5::RegStateResult.AccessTechnologySpecificInfo.EutranRegistrationInfo;
 import @1.5::RegistrationFailCause;
@@ -281,7 +285,7 @@
      * suggestion. 0 indicates retry should be performed immediately. 0x7fffffffffffffff indicates
      * the device should not retry data setup anymore.
      */
-    uint64_t suggestedRetryTime;
+    int64_t suggestedRetryTime;
 
     /** Context ID, uniquely identifies this data connection. */
     int32_t cid;
@@ -347,7 +351,7 @@
 
     /**
      * The allocated pdu session id for this data call.
-     * A value of -1 means no pdu session id was attached to this call.
+     * A value of 0 means no pdu session id was attached to this call.
      *
      * Reference: 3GPP TS 24.007 section 11.2.3.1b
      */
@@ -733,3 +737,70 @@
      */
     string forwardedNumber;
 };
+
+struct PhysicalChannelConfig {
+    /** Connection status for cell. Valid values are PRIMARY_SERVING and SECONDARY_SERVING */
+    CellConnectionStatus status;
+
+    /** The radio technology for this physical channel */
+    RadioTechnology rat;
+
+    /** Downlink Absolute Radio Frequency Channel Number */
+    int32_t downlinkChannelNumber;
+
+    /** Uplink Absolute Radio Frequency Channel Number */
+    int32_t uplinkChannelNumber;
+
+    /** Downlink cell bandwidth, in kHz */
+    int32_t cellBandwidthDownlink;
+
+    /** Uplink cell bandwidth, in kHz */
+    int32_t cellBandwidthUplink;
+
+    /**
+     * A list of data calls mapped to this physical channel. The context id must match the cid of
+     * @1.5::SetupDataCallResult. An empty list means the physical channel has no data call mapped
+     * to it.
+     */
+    vec<int32_t> contextIds;
+
+    /**
+     * The physical cell identifier for this cell.
+     *
+     * In UTRAN, this value is primary scrambling code. The range is [0, 511].
+     * Reference: 3GPP TS 25.213 section 5.2.2.
+     *
+     * In EUTRAN, this value is physical layer cell identity. The range is [0, 503].
+     * Reference: 3GPP TS 36.211 section 6.11.
+     *
+     * In 5G RAN, this value is physical layer cell identity. The range is [0, 1007].
+     * Reference: 3GPP TS 38.211 section 7.4.2.1.
+     */
+    uint32_t physicalCellId;
+
+    /**
+     * The frequency band to scan.
+     */
+    safe_union Band {
+        /** Valid only if radioAccessNetwork = GERAN. */
+        GeranBands geranBand;
+        /** Valid only if radioAccessNetwork = UTRAN. */
+        UtranBands utranBand;
+        /** Valid only if radioAccessNetwork = EUTRAN. */
+        EutranBands eutranBand;
+        /** Valid only if radioAccessNetwork = NGRAN. */
+        NgranBands ngranBand;
+    } band;
+};
+
+/**
+ * Extended from @1.5 NgranBands
+ * IRadio 1.6 supports NGRAN bands up to V16.5.0
+ */
+enum NgranBands  : @1.5::NgranBands {
+    /** 3GPP TS 38.101-1, Table 5.2-1: FR1 bands */
+    BAND_26 = 26,
+    BAND_46 = 46,
+    BAND_53 = 53,
+    BAND_96 = 96,
+};
diff --git a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
index fbcd7a9..5fcfa3b 100644
--- a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
+++ b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
@@ -857,6 +857,11 @@
             const ::android::hardware::hidl_vec<::android::hardware::radio::V1_6::CellInfo>&
                     records);
 
+    Return<void> currentPhysicalChannelConfigs_1_6(
+            RadioIndicationType type,
+            const ::android::hardware::hidl_vec<
+                    ::android::hardware::radio::V1_6::PhysicalChannelConfig>& configs);
+
     /* 1.5 Api */
     Return<void> uiccApplicationsEnablementChanged(RadioIndicationType type, bool enabled);
 
diff --git a/radio/1.6/vts/functional/radio_indication.cpp b/radio/1.6/vts/functional/radio_indication.cpp
index bfc54c0..e7a9680 100644
--- a/radio/1.6/vts/functional/radio_indication.cpp
+++ b/radio/1.6/vts/functional/radio_indication.cpp
@@ -30,6 +30,13 @@
     return Void();
 }
 
+Return<void> RadioIndication_v1_6::currentPhysicalChannelConfigs_1_6(
+        RadioIndicationType /*type*/,
+        const ::android::hardware::hidl_vec<
+                ::android::hardware::radio::V1_6::PhysicalChannelConfig>& /*configs*/) {
+    return Void();
+}
+
 /* 1.5 Apis */
 Return<void> RadioIndication_v1_6::uiccApplicationsEnablementChanged(RadioIndicationType /*type*/,
                                                                      bool /*enabled*/) {
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Algorithm.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Algorithm.aidl
index 46e0ae0..a6c3e65 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Algorithm.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Algorithm.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BeginResult.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BeginResult.aidl
index ed96485..84395af 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BeginResult.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BeginResult.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BlockMode.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BlockMode.aidl
index dddc9d8..e914823 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BlockMode.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/BlockMode.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ByteArray.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ByteArray.aidl
index 3d18a26..cef8eca 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ByteArray.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ByteArray.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Certificate.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Certificate.aidl
index 9e0f8dc..2277831 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Certificate.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Certificate.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Digest.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Digest.aidl
index 8fc4d42..2e583ce 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Digest.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Digest.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
index 7c3f2f3..b372822 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ErrorCode.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ErrorCode.aidl
index 8694b32..aa8c071 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ErrorCode.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/ErrorCode.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthToken.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthToken.aidl
index 9ea24f5..0d43d8d 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthToken.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthToken.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthenticatorType.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthenticatorType.aidl
index aef5ee0..9ab00c1 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthenticatorType.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/HardwareAuthenticatorType.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintDevice.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintDevice.aidl
index 3d08cfe..07c2844 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintDevice.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintDevice.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
@@ -21,9 +22,9 @@
   android.hardware.security.keymint.KeyMintHardwareInfo getHardwareInfo();
   android.hardware.security.keymint.VerificationToken verifyAuthorization(in long challenge, in android.hardware.security.keymint.HardwareAuthToken token);
   void addRngEntropy(in byte[] data);
-  void generateKey(in android.hardware.security.keymint.KeyParameter[] keyParams, out android.hardware.security.keymint.ByteArray generatedKeyBlob, out android.hardware.security.keymint.KeyCharacteristics generatedKeyCharacteristics, out android.hardware.security.keymint.Certificate[] outCertChain);
-  void importKey(in android.hardware.security.keymint.KeyParameter[] inKeyParams, in android.hardware.security.keymint.KeyFormat inKeyFormat, in byte[] inKeyData, out android.hardware.security.keymint.ByteArray outImportedKeyBlob, out android.hardware.security.keymint.KeyCharacteristics outImportedKeyCharacteristics, out android.hardware.security.keymint.Certificate[] outCertChain);
-  void importWrappedKey(in byte[] inWrappedKeyData, in byte[] inWrappingKeyBlob, in byte[] inMaskingKey, in android.hardware.security.keymint.KeyParameter[] inUnwrappingParams, in long inPasswordSid, in long inBiometricSid, out android.hardware.security.keymint.ByteArray outImportedKeyBlob, out android.hardware.security.keymint.KeyCharacteristics outImportedKeyCharacteristics);
+  android.hardware.security.keymint.KeyCreationResult generateKey(in android.hardware.security.keymint.KeyParameter[] keyParams);
+  android.hardware.security.keymint.KeyCreationResult importKey(in android.hardware.security.keymint.KeyParameter[] keyParams, in android.hardware.security.keymint.KeyFormat keyFormat, in byte[] keyData);
+  android.hardware.security.keymint.KeyCreationResult importWrappedKey(in byte[] wrappedKeyData, in byte[] wrappingKeyBlob, in byte[] maskingKey, in android.hardware.security.keymint.KeyParameter[] unwrappingParams, in long passwordSid, in long biometricSid);
   byte[] upgradeKey(in byte[] inKeyBlobToUpgrade, in android.hardware.security.keymint.KeyParameter[] inUpgradeParams);
   void deleteKey(in byte[] inKeyBlob);
   void deleteAllKeys();
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintOperation.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintOperation.aidl
index 8e3b0fc..08aa00a 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintOperation.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/IKeyMintOperation.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCharacteristics.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCharacteristics.aidl
index fb4214c..49ea8af 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCharacteristics.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCharacteristics.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
@@ -18,6 +19,6 @@
 package android.hardware.security.keymint;
 @VintfStability
 parcelable KeyCharacteristics {
-  android.hardware.security.keymint.KeyParameter[] softwareEnforced;
-  android.hardware.security.keymint.KeyParameter[] hardwareEnforced;
+  android.hardware.security.keymint.SecurityLevel securityLevel;
+  android.hardware.security.keymint.KeyParameter[] authorizations;
 }
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCreationResult.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCreationResult.aidl
new file mode 100644
index 0000000..4b9ac79
--- /dev/null
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyCreationResult.aidl
@@ -0,0 +1,25 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.security.keymint;
+@VintfStability
+parcelable KeyCreationResult {
+  byte[] keyBlob;
+  android.hardware.security.keymint.KeyCharacteristics[] keyCharacteristics;
+  android.hardware.security.keymint.Certificate[] certificateChain;
+}
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyFormat.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyFormat.aidl
index f701c80..4eb5a78 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyFormat.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyFormat.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyMintHardwareInfo.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyMintHardwareInfo.aidl
index 5e9f7ae..0390ec9 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyMintHardwareInfo.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyMintHardwareInfo.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyOrigin.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyOrigin.aidl
index 9728bf9..e84cf74 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyOrigin.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyOrigin.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameter.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameter.aidl
index 4985768..6829a2b 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameter.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameter.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterArray.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterArray.aidl
index 2c3b768..882ca89 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterArray.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterArray.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterValue.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterValue.aidl
index ecf20ad..6c11a92 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterValue.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyParameterValue.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyPurpose.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyPurpose.aidl
index a6fd8c3..ff8d85a 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyPurpose.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/KeyPurpose.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/PaddingMode.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/PaddingMode.aidl
index 2ecfa1e..6c61312 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/PaddingMode.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/PaddingMode.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/SecurityLevel.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/SecurityLevel.aidl
index 601693f..c4812ed 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/SecurityLevel.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/SecurityLevel.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Tag.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Tag.aidl
index 814405c..ce12fed 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Tag.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Tag.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/TagType.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/TagType.aidl
index bb2766c..41c8832 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/TagType.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/TagType.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Timestamp.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Timestamp.aidl
index 4d5b659..963e66e 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Timestamp.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/Timestamp.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/VerificationToken.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/VerificationToken.aidl
index 5c76816..7dc556c 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/VerificationToken.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/VerificationToken.aidl
@@ -2,13 +2,14 @@
 // THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file built
 // with the aidl_interface module type with versions property set. The module
 // type is used to build AIDL files in a way that they can be used across
 // independently updatable components of the system. If a device is shipped
diff --git a/security/keymint/aidl/android/hardware/security/keymint/Certificate.aidl b/security/keymint/aidl/android/hardware/security/keymint/Certificate.aidl
index a953859..0e5d898 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/Certificate.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/Certificate.aidl
@@ -17,9 +17,8 @@
 package android.hardware.security.keymint;
 
 /**
- * This encodes the IKeyMintDevice attestation generated certificate.
+ * This encodes an IKeyMintDevice certificate, generated for a KeyMint asymmetric public key.
  */
-
 @VintfStability
 parcelable Certificate {
     /**
diff --git a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
index 4944acb..820e135 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
@@ -18,10 +18,9 @@
 
 import android.hardware.security.keymint.BeginResult;
 import android.hardware.security.keymint.ByteArray;
-import android.hardware.security.keymint.Certificate;
 import android.hardware.security.keymint.HardwareAuthToken;
 import android.hardware.security.keymint.IKeyMintOperation;
-import android.hardware.security.keymint.KeyCharacteristics;
+import android.hardware.security.keymint.KeyCreationResult;
 import android.hardware.security.keymint.KeyFormat;
 import android.hardware.security.keymint.KeyParameter;
 import android.hardware.security.keymint.KeyMintHardwareInfo;
@@ -126,16 +125,22 @@
  * attacker can use them at will (though they're more secure than keys which can be
  * exfiltrated).  Therefore, IKeyMintDevice must enforce access controls.
  *
- * Access controls are defined as an "authorization list" of tag/value pairs.  Authorization tags
- * are 32-bit integers from the Tag enum, and the values are a variety of types, defined in the
- * TagType enum.  Some tags may be repeated to specify multiple values.  Whether a tag may be
- * repeated is specified in the documentation for the tag and in the TagType.  When a key is
- * created or imported, the caller specifies an authorization list.  The IKeyMintDevice must divide
- * the caller-provided authorizations into two lists, those it enforces in tee secure zone and
- * those enforced in the strongBox hardware.  These two lists are returned as the "teeEnforced"
- * and "strongboxEnforced" elements of the KeyCharacteristics struct. Note that software enforced
- * authorization list entries are not returned because they are not enforced by keymint.  The
- * IKeyMintDevice must also add the following authorizations to the appropriate list:
+ * Access controls are defined as "authorization lists" of tag/value pairs.  Authorization tags are
+ * 32-bit integers from the Tag enum, and the values are a variety of types, defined in the TagType
+ * enum.  Some tags may be repeated to specify multiple values.  Whether a tag may be repeated is
+ * specified in the documentation for the tag and in the TagType.  When a key is created or
+ * imported, the caller specifies a `key_description` authorization list.  The IKeyMintDevice must
+ * determine which tags it can and cannot enforce, and at what SecurityLevel, and return an array of
+ * `KeyCharacteristics` structures that contains everything it will enforce, associated with the
+ * appropriate security level, which is one of SOFTWARE, TRUSTED_ENVIRONMENT and STRONGBOX.
+ * Typically, implementations will only return a single KeyCharacteristics structure, because
+ * everything they enforce is enforced at the same security level.  There may be cases, however, for
+ * which multiple security levels are relevant. One example is that of a StrongBox IKeyMintDevice
+ * that relies on a TEE to enforce biometric user authentication.  In that case, the generate/import
+ * methods must return two KeyCharacteristics structs, one with SecurityLevel::TRUSTED_ENVIRONMENT
+ * and the biometric authentication-related tags, and another with SecurityLevel::STRONGBOX and
+ * everything else.  The IKeyMintDevice must also add the following authorizations to the
+ * appropriate list:
  *
  * o    Tag::OS_VERSION
  * o    Tag::OS_PATCHLEVEL
@@ -148,26 +153,27 @@
  * The caller must always provide the current date time in the keyParameter CREATION_DATETIME
  * tags.
  *
- * All authorization tags and their values, both teeEnforced and strongboxEnforced, including
- * unknown tags, must be cryptographically bound to the private/secret key material such that any
- * modification of the portion of the key blob that contains the authorization list makes it
- * impossible for the secure environment to obtain the private/secret key material.  The
- * recommended approach to meet this requirement is to use the full set of authorization tags
- * associated with a key as input to a secure key derivation function used to derive a key that
- * is used to encrypt the private/secret key material.
+ * All authorization tags and their values enforced by an IKeyMintDevice must be cryptographically
+ * bound to the private/secret key material such that any modification of the portion of the key
+ * blob that contains the authorization list makes it impossible for the secure environment to
+ * obtain the private/secret key material.  The recommended approach to meet this requirement is to
+ * use the full set of authorization tags associated with a key as input to a secure key derivation
+ * function used to derive a key (the KEK) that is used to encrypt the private/secret key material.
+ * Note that it is NOT acceptable to use a static KEK to encrypt the private/secret key material
+ * with an AEAD cipher mode, using the enforced authorization tags as AAD.  This is because
+ * Tag::APPLICATION_DATA must not be included in the authorization tags stored in the key blob, but
+ * must be provided by the caller for every use.  Assuming the Tag::APPLICATION_DATA value has
+ * sufficient entropy, this provides a cryptographic guarantee that an attacker cannot use a key
+ * without knowing the Tag::APPLICATION_DATA value, even if they compromise the IKeyMintDevice.
  *
- * IKeyMintDevice implementations ignore any tags they cannot enforce and do not return them
- * in KeyCharacteristics.  For example, Tag::ORIGINATION_EXPIRE_DATETIME provides the date and
- * time after which a key may not be used to encrypt or sign new messages.  Unless the
- * IKeyMintDevice has access to a secure source of current date/time information, it is not
- * possible for the IKeyMintDevice to enforce this tag.  An IKeyMintDevice implementation will
- * not rely on the non-secure world's notion of time, because it could be controlled by an
- * attacker. Similarly, it cannot rely on GPSr time, even if it has exclusive control of the
- * GPSr, because that might be spoofed by attacker RF signals.
- *
- * IKeyMintDevices do not use or enforce any tags they place in the softwareEnforced
- * list.  The IKeyMintDevice caller must enforce them, and it is unnecessary to enforce them
- * twice.
+ * IKeyMintDevice implementations must ignore any tags they cannot enforce and must not return them
+ * in KeyCharacteristics.  For example, Tag::ORIGINATION_EXPIRE_DATETIME provides the date and time
+ * after which a key may not be used to encrypt or sign new messages.  Unless the IKeyMintDevice has
+ * access to a secure source of current date/time information, it is not possible for the
+ * IKeyMintDevice to enforce this tag.  An IKeyMintDevice implementation will not rely on the
+ * non-secure world's notion of time, because it could be controlled by an attacker. Similarly, it
+ * cannot rely on GPSr time, even if it has exclusive control of the GPSr, because that might be
+ * spoofed by attacker RF signals.
  *
  * Some tags must be enforced by the IKeyMintDevice.  See the detailed documentation on each Tag
  * in Tag.aidl.
@@ -337,38 +343,9 @@
      *        provided in params.  See above for detailed specifications of which tags are required
      *        for which types of keys.
      *
-     * @return generatedKeyBlob Opaque descriptor of the generated key.  The recommended
-     *         implementation strategy is to include an encrypted copy of the key material, wrapped
-     *         in a key unavailable outside secure hardware.
-     *
-     * @return generatedKeyCharacteristics Description of the generated key, divided into two sets:
-     *         hardware-enforced and software-enforced.  The description here applies equally
-     *         to the key characteristics lists returned by generateKey, importKey and
-     *         importWrappedKey.  The characteristics returned by this parameter completely
-     *         describe the type and usage of the specified key.
-     *
-     *         The rule that IKeyMintDevice implementations must use for deciding whether a
-     *         given tag belongs in the hardware-enforced or software-enforced list is that if
-     *         the meaning of the tag is fully assured by secure hardware, it is hardware
-     *         enforced.  Otherwise, it's software enforced.
-     *
-     * @return outCertChain If the key is an asymmetric key, and proper keyparameters for
-     *         attestation (such as challenge) is provided, then this parameter will return the
-     *         attestation certificate.  If the signing of the attestation certificate is from a
-     *         factory key, additional certificates back to the root attestation certificate will
-     *         also be provided. Clients will need to check root certificate against a known-good
-     *         value. The certificates must be DER-encoded.  Caller needs to provide
-     *         CREATION_DATETIME as one of the attestation parameters, otherwise the attestation
-     *         certificate will not contain the creation datetime.  The first certificate in the
-     *         vector is the attestation for the generated key itself, the next certificate is
-     *         the key that signs the first certificate, and so forth.  The last certificate in
-     *         the chain is the root certificate.  If the key is a symmetric key, then no
-     *         certificate will be returned and this variable will return empty. TODO: change
-     *         certificate return to a single certificate and make it nullable b/163604282.
+     * @return The result of key creation.  See KeyCreationResult.aidl.
      */
-    void generateKey(in KeyParameter[] keyParams, out ByteArray generatedKeyBlob,
-                     out KeyCharacteristics generatedKeyCharacteristics,
-                     out Certificate[] outCertChain);
+    KeyCreationResult generateKey(in KeyParameter[] keyParams);
 
     /**
      * Imports key material into an IKeyMintDevice.  Key definition parameters and return values
@@ -396,29 +373,10 @@
      *
      * @param inKeyData The key material to import, in the format specified in keyFormat.
      *
-     * @return outImportedKeyBlob descriptor of the imported key.  The format of the keyblob will
-     *         be the google specified keyblob format.
-     *
-     * @return outImportedKeyCharacteristics Description of the generated key.  See the
-     *         keyCharacteristics description in generateKey.
-     *
-     * @return outCertChain If the key is an asymmetric key, and proper keyparameters for
-     *         attestation (such as challenge) is provided, then this parameter will return the
-     *         attestation certificate.  If the signing of the attestation certificate is from a
-     *         factory key, additional certificates back to the root attestation certificate will
-     *         also be provided. Clients will need to check root certificate against a known-good
-     *         value. The certificates must be DER-encoded.  Caller needs to provide
-     *         CREATION_DATETIME as one of the attestation parameters, otherwise the attestation
-     *         certificate will not contain the creation datetime.  The first certificate in the
-     *         vector is the attestation for the generated key itself, the next certificate is
-     *         the key that signs the first certificate, and so forth.  The last certificate in
-     *         the chain is the root certificate.  If the key is a symmetric key, then no
-     *         certificate will be returned and this variable will return empty.
+     * @return The result of key creation.  See KeyCreationResult.aidl.
      */
-    void importKey(in KeyParameter[] inKeyParams, in KeyFormat inKeyFormat,
-                   in byte[] inKeyData, out ByteArray outImportedKeyBlob,
-                   out KeyCharacteristics outImportedKeyCharacteristics,
-                   out Certificate[] outCertChain);
+    KeyCreationResult importKey(in KeyParameter[] keyParams, in KeyFormat keyFormat,
+                                in byte[] keyData);
 
     /**
      * Securely imports a key, or key pair, returning a key blob and a description of the imported
@@ -474,45 +432,38 @@
      *     5. Perform the equivalent of calling importKey(keyParams, keyFormat, keyData), except
      *        that the origin tag should be set to SECURELY_IMPORTED.
      *
-     * @param inWrappingKeyBlob The opaque key descriptor returned by generateKey() or importKey().
+     * @param wrappingKeyBlob The opaque key descriptor returned by generateKey() or importKey().
      *        This key must have been created with Purpose::WRAP_KEY.
      *
-     * @param inMaskingKey The 32-byte value XOR'd with the transport key in the SecureWrappedKey
+     * @param maskingKey The 32-byte value XOR'd with the transport key in the SecureWrappedKey
      *        structure.
      *
-     * @param inUnwrappingParams must contain any parameters needed to perform the unwrapping
-     *        operation.  For example, if the wrapping key is an AES key the block and padding
-     *        modes must be specified in this argument.
+     * @param unwrappingParams must contain any parameters needed to perform the unwrapping
+     *        operation.  For example, if the wrapping key is an AES key the block and padding modes
+     *        must be specified in this argument.
      *
-     * @param inPasswordSid specifies the password secure ID (SID) of the user that owns the key
-     *        being installed.  If the authorization list in wrappedKeyData contains a
-     *        Tag::USER_SECURE_IDwith a value that has the HardwareAuthenticatorType::PASSWORD
-     *        bit set, the constructed key must be bound to the SID value provided by this
-     *        argument.  If the wrappedKeyData does not contain such a tag and value, this argument
-     *        must be ignored.
+     * @param passwordSid specifies the password secure ID (SID) of the user that owns the key being
+     *        installed.  If the authorization list in wrappedKeyData contains a
+     *        Tag::USER_SECURE_IDwith a value that has the HardwareAuthenticatorType::PASSWORD bit
+     *        set, the constructed key must be bound to the SID value provided by this argument.  If
+     *        the wrappedKeyData does not contain such a tag and value, this argument must be
+     *        ignored.
      *
-     * @param inBiometricSid specifies the biometric secure ID (SID) of the user that owns the key
+     * @param biometricSid specifies the biometric secure ID (SID) of the user that owns the key
      *        being installed.  If the authorization list in wrappedKeyData contains a
      *        Tag::USER_SECURE_ID with a value that has the HardwareAuthenticatorType::FINGERPRINT
      *        bit set, the constructed key must be bound to the SID value provided by this argument.
      *        If the wrappedKeyData does not contain such a tag and value, this argument must be
      *        ignored.
      *
-     * @return outImportedKeyBlob Opaque descriptor of the imported key.  It is recommended that
-     *         the keyBlob contain a copy of the key material, wrapped in a key unavailable outside
-     *         secure hardware.
-     *
-     * @return outImportedKeyCharacteristics Description of the generated key.  See the description
-     *         of keyCharacteristics parameter in generateKey.
+     * @return The result of key creation.  See KeyCreationResult.aidl.
      */
-    void importWrappedKey(in byte[] inWrappedKeyData,
-                          in byte[] inWrappingKeyBlob,
-                          in byte[] inMaskingKey,
-                          in KeyParameter[] inUnwrappingParams,
-                          in long inPasswordSid,
-                          in long inBiometricSid,
-                          out ByteArray outImportedKeyBlob,
-                          out KeyCharacteristics outImportedKeyCharacteristics);
+     KeyCreationResult importWrappedKey(in byte[] wrappedKeyData,
+                                        in byte[] wrappingKeyBlob,
+                                        in byte[] maskingKey,
+                                        in KeyParameter[] unwrappingParams,
+                                        in long passwordSid,
+                                        in long biometricSid);
 
     /**
      * Upgrades an old key blob.  Keys can become "old" in two ways: IKeyMintDevice can be
diff --git a/security/keymint/aidl/android/hardware/security/keymint/KeyCharacteristics.aidl b/security/keymint/aidl/android/hardware/security/keymint/KeyCharacteristics.aidl
index 0801868..edd4d8f 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/KeyCharacteristics.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/KeyCharacteristics.aidl
@@ -17,25 +17,20 @@
 package android.hardware.security.keymint;
 
 import android.hardware.security.keymint.KeyParameter;
+import android.hardware.security.keymint.SecurityLevel;
 
 /**
- * KeyCharacteristics defines the attributes of a key, including cryptographic parameters, and usage
- * restrictions.  It consits of two vectors of KeyParameters, one for "softwareEnforced" attributes
- * and one for "hardwareEnforced" attributes.
+ * KeyCharacteristics defines the attributes of a key that are enforced by KeyMint, and the security
+ * level (see SecurityLevel.aidl) of that enforcement.
  *
- * KeyCharacteristics objects are returned by generateKey, importKey, importWrappedKey and
- * getKeyCharacteristics.  The IKeyMintDevice secure environment is responsible for allocating the
- * parameters, all of which are Tags with associated values, to the correct vector.  The
- * hardwareEnforced vector must contain only those attributes which are enforced by secure hardware.
- * All others should be in the softwareEnforced vector.  See the definitions of individual Tag enums
- * for specification of which must be hardware-enforced, which may be software-enforced and which
- * must never appear in KeyCharacteristics.
+ * The `generateKey` `importKey` and `importWrappedKey` methods each return an array of
+ * KeyCharacteristics, specifying the security levels of enforcement and the authorizations
+ * enforced.  Note that enforcement at a given security level means that the semantics of the tag
+ * and value are fully enforced.  See the definition of individual tags for specifications of what
+ * must be enforced.
  */
 @VintfStability
 parcelable KeyCharacteristics {
-    /* TODO(seleneh) get rid of the software enforced in keymint.  replace hardware enforced with
-     * tee enforced and strongbox enforced.
-     */
-    KeyParameter[] softwareEnforced;
-    KeyParameter[] hardwareEnforced;
+    SecurityLevel securityLevel;
+    KeyParameter[] authorizations;
 }
diff --git a/security/keymint/aidl/android/hardware/security/keymint/KeyCreationResult.aidl b/security/keymint/aidl/android/hardware/security/keymint/KeyCreationResult.aidl
new file mode 100644
index 0000000..b149ac9
--- /dev/null
+++ b/security/keymint/aidl/android/hardware/security/keymint/KeyCreationResult.aidl
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.security.keymint;
+
+import android.hardware.security.keymint.Certificate;
+import android.hardware.security.keymint.KeyCharacteristics;
+
+/**
+ * This structure is returned when a new key is created with generateKey(), importKey() or
+ * importWrappedKey().
+ */
+@VintfStability
+parcelable KeyCreationResult {
+    /**
+     * `keyBlob` is an descriptor of the generated/imported key key.
+     */
+    byte[] keyBlob;
+
+    /**
+     * `keyCharacteristics` is a description of the generated key in the form of authorization lists
+     * associated with security levels.  The rules that IKeyMintDevice implementations must use for
+     * deciding whether a given tag from `keyParams` argument to the generation/import method should
+     * be returned in `keyCharacteristics` are:
+     *
+     * - If the IKeyMintDevice cannot fully enforce the semantics of the tag, it should be omitted.
+     * - If the semantics of the tag are fully enforced by the IKeyMintDevice, without any
+     *   assistance from components running at other security levels, it should be included in an
+     *   entry with the SecurityLevel of the IKeyMintDevice.
+     * - If the semantics of the tag are fully enforced, but with the assistance of components
+     *   running at another SecurityLevel, it should be included in an entry with the minimum
+     *   SecurityLevel of the involved components.  For example if a StrongBox IKeyMintDevice relies
+     *   on a TEE to validate biometric authentication, biometric authentication tags go in an entry
+     *   with SecurityLevel::TRUSTED_ENVIRONMENT.
+     */
+    KeyCharacteristics[] keyCharacteristics;
+
+    /**
+     * If the generated/imported key is an asymmetric key, `certificateChain` will contain a chain
+     * of one or more certificates.  If the key parameters provided to the generate/import method
+     * contains Tag::ATTESTATION_CHALLENGE the first certificate will contain an attestation
+     * extension, and will be signed by a factory-installed attestation key and followed by a chain
+     * of certificates leading to an authoritative root.  If there is no attestation challenge, only
+     * one certificate will be returned, and it will be self-signed or contain a fake signature,
+     * depending on whether the key has KeyPurpose::SIGN.  If the generated key is symmetric,
+     * certificateChain will be empty.
+     */
+    Certificate[] certificateChain;
+}
diff --git a/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl b/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
index 9f41b4e..f92bf00 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
@@ -512,10 +512,10 @@
 
     /**
      * Tag::APPLICATION_DATA.  When provided to generateKey or importKey, this tag specifies data
-     * that is necessary during all uses of the key.  In particular, calls to exportKey() and
-     * getKeyCharacteristics() must provide the same value to the appData parameter, and calls to
-     * begin must provide this tag and the same associated data as part of the inParams set.  If
-     * the correct data is not provided, the method must return ErrorCode::INVALID_KEY_BLOB.
+     * that is necessary during all uses of the key.  In particular, calls to begin() and
+     * exportKey() must provide the same value to the appData parameter, and calls to begin must
+     * provide this tag and the same associated data as part of the inParams set.  If the correct
+     * data is not provided, the method must return ErrorCode::INVALID_KEY_BLOB.
      *
      * The content of this tag msut be bound to the key cryptographically, meaning it must not be
      * possible for an adversary who has access to all of the secure world secrets but does not have
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
index 94bc199..93a216f 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
@@ -17,6 +17,7 @@
 #include "KeyMintAidlTestBase.h"
 
 #include <chrono>
+#include <unordered_set>
 #include <vector>
 
 #include <android-base/logging.h>
@@ -43,6 +44,34 @@
 
 namespace test {
 
+namespace {
+
+// Predicate for testing basic characteristics validity in generation or import.
+bool KeyCharacteristicsBasicallyValid(SecurityLevel secLevel,
+                                      const vector<KeyCharacteristics>& key_characteristics) {
+    if (key_characteristics.empty()) return false;
+
+    std::unordered_set<SecurityLevel> levels_seen;
+    for (auto& entry : key_characteristics) {
+        if (entry.authorizations.empty()) return false;
+
+        if (levels_seen.find(entry.securityLevel) != levels_seen.end()) return false;
+        levels_seen.insert(entry.securityLevel);
+
+        // Generally, we should only have one entry, at the same security level as the KM
+        // instance.  There is an exception: StrongBox KM can have some authorizations that are
+        // enforced by the TEE.
+        bool isExpectedSecurityLevel = secLevel == entry.securityLevel ||
+                                       (secLevel == SecurityLevel::STRONGBOX &&
+                                        entry.securityLevel == SecurityLevel::TRUSTED_ENVIRONMENT);
+
+        if (!isExpectedSecurityLevel) return false;
+    }
+    return true;
+}
+
+}  // namespace
+
 ErrorCode KeyMintAidlTestBase::GetReturnErrorCode(const Status& result) {
     if (result.isOk()) return ErrorCode::OK;
 
@@ -78,35 +107,30 @@
 }
 
 ErrorCode KeyMintAidlTestBase::GenerateKey(const AuthorizationSet& key_desc,
-                                           vector<uint8_t>* keyBlob, KeyCharacteristics* keyChar) {
-    EXPECT_NE(keyBlob, nullptr) << "Key blob pointer must not be null.  Test bug";
-    EXPECT_NE(keyChar, nullptr)
+                                           vector<uint8_t>* key_blob,
+                                           vector<KeyCharacteristics>* key_characteristics) {
+    EXPECT_NE(key_blob, nullptr) << "Key blob pointer must not be null.  Test bug";
+    EXPECT_NE(key_characteristics, nullptr)
             << "Previous characteristics not deleted before generating key.  Test bug.";
 
     // Aidl does not clear these output parameters if the function returns
     // error.  This is different from hal where output parameter is always
     // cleared due to hal returning void.  So now we need to do our own clearing
     // of the output variables prior to calling keyMint aidl libraries.
-    keyBlob->clear();
-    keyChar->softwareEnforced.clear();
-    keyChar->hardwareEnforced.clear();
-    certChain_.clear();
+    key_blob->clear();
+    key_characteristics->clear();
+    cert_chain_.clear();
 
-    Status result;
-    ByteArray blob;
+    KeyCreationResult creationResult;
+    Status result = keymint_->generateKey(key_desc.vector_data(), &creationResult);
 
-    result = keymint_->generateKey(key_desc.vector_data(), &blob, keyChar, &certChain_);
-
-    // On result, blob & characteristics should be empty.
     if (result.isOk()) {
-        if (SecLevel() != SecurityLevel::SOFTWARE) {
-            EXPECT_GT(keyChar->hardwareEnforced.size(), 0);
-        }
-        EXPECT_GT(keyChar->softwareEnforced.size(), 0);
-        // TODO(seleneh) in a later version where we return @nullable
-        // single Certificate, check non-null single certificate is always
-        // non-empty.
-        *keyBlob = blob.data;
+        EXPECT_PRED2(KeyCharacteristicsBasicallyValid, SecLevel(),
+                     creationResult.keyCharacteristics);
+        EXPECT_GT(creationResult.keyBlob.size(), 0);
+        *key_blob = std::move(creationResult.keyBlob);
+        *key_characteristics = std::move(creationResult.keyCharacteristics);
+        cert_chain_ = std::move(creationResult.certificateChain);
     }
 
     return GetReturnErrorCode(result);
@@ -118,25 +142,26 @@
 
 ErrorCode KeyMintAidlTestBase::ImportKey(const AuthorizationSet& key_desc, KeyFormat format,
                                          const string& key_material, vector<uint8_t>* key_blob,
-                                         KeyCharacteristics* key_characteristics) {
+                                         vector<KeyCharacteristics>* key_characteristics) {
     Status result;
 
-    certChain_.clear();
-    key_characteristics->softwareEnforced.clear();
-    key_characteristics->hardwareEnforced.clear();
+    cert_chain_.clear();
+    key_characteristics->clear();
     key_blob->clear();
 
-    ByteArray blob;
+    KeyCreationResult creationResult;
     result = keymint_->importKey(key_desc.vector_data(), format,
-                                 vector<uint8_t>(key_material.begin(), key_material.end()), &blob,
-                                 key_characteristics, &certChain_);
+                                 vector<uint8_t>(key_material.begin(), key_material.end()),
+                                 &creationResult);
 
     if (result.isOk()) {
-        if (SecLevel() != SecurityLevel::SOFTWARE) {
-            EXPECT_GT(key_characteristics->hardwareEnforced.size(), 0);
-        }
-        EXPECT_GT(key_characteristics->softwareEnforced.size(), 0);
-        *key_blob = blob.data;
+        EXPECT_PRED2(KeyCharacteristicsBasicallyValid, SecLevel(),
+                     creationResult.keyCharacteristics);
+        EXPECT_GT(creationResult.keyBlob.size(), 0);
+
+        *key_blob = std::move(creationResult.keyBlob);
+        *key_characteristics = std::move(creationResult.keyCharacteristics);
+        cert_chain_ = std::move(creationResult.certificateChain);
     }
 
     return GetReturnErrorCode(result);
@@ -151,25 +176,25 @@
                                                 const AuthorizationSet& wrapping_key_desc,
                                                 string masking_key,
                                                 const AuthorizationSet& unwrapping_params) {
-    Status result;
     EXPECT_EQ(ErrorCode::OK, ImportKey(wrapping_key_desc, KeyFormat::PKCS8, wrapping_key));
 
-    ByteArray outBlob;
-    key_characteristics_.softwareEnforced.clear();
-    key_characteristics_.hardwareEnforced.clear();
+    key_characteristics_.clear();
 
-    result = keymint_->importWrappedKey(vector<uint8_t>(wrapped_key.begin(), wrapped_key.end()),
-                                        key_blob_,
-                                        vector<uint8_t>(masking_key.begin(), masking_key.end()),
-                                        unwrapping_params.vector_data(), 0 /* passwordSid */,
-                                        0 /* biometricSid */, &outBlob, &key_characteristics_);
+    KeyCreationResult creationResult;
+    Status result = keymint_->importWrappedKey(
+            vector<uint8_t>(wrapped_key.begin(), wrapped_key.end()), key_blob_,
+            vector<uint8_t>(masking_key.begin(), masking_key.end()),
+            unwrapping_params.vector_data(), 0 /* passwordSid */, 0 /* biometricSid */,
+            &creationResult);
 
     if (result.isOk()) {
-        key_blob_ = outBlob.data;
-        if (SecLevel() != SecurityLevel::SOFTWARE) {
-            EXPECT_GT(key_characteristics_.hardwareEnforced.size(), 0);
-        }
-        EXPECT_GT(key_characteristics_.softwareEnforced.size(), 0);
+        EXPECT_PRED2(KeyCharacteristicsBasicallyValid, SecLevel(),
+                     creationResult.keyCharacteristics);
+        EXPECT_GT(creationResult.keyBlob.size(), 0);
+
+        key_blob_ = std::move(creationResult.keyBlob);
+        key_characteristics_ = std::move(creationResult.keyCharacteristics);
+        cert_chain_ = std::move(creationResult.certificateChain);
     }
 
     return GetReturnErrorCode(result);
@@ -754,6 +779,15 @@
     return {};
 }
 
+static const vector<KeyParameter> kEmptyAuthList{};
+
+const vector<KeyParameter>& KeyMintAidlTestBase::SecLevelAuthorizations(
+        const vector<KeyCharacteristics>& key_characteristics) {
+    auto found = std::find_if(key_characteristics.begin(), key_characteristics.end(),
+                              [this](auto& entry) { return entry.securityLevel == SecLevel(); });
+    return (found == key_characteristics.end()) ? kEmptyAuthList : found->authorizations;
+}
+
 }  // namespace test
 
 }  // namespace aidl::android::hardware::security::keymint
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
index f73c26d..f36c397 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
@@ -56,13 +56,13 @@
 
     ErrorCode GetReturnErrorCode(const Status& result);
     ErrorCode GenerateKey(const AuthorizationSet& key_desc, vector<uint8_t>* key_blob,
-                          KeyCharacteristics* key_characteristics);
+                          vector<KeyCharacteristics>* key_characteristics);
 
     ErrorCode GenerateKey(const AuthorizationSet& key_desc);
 
     ErrorCode ImportKey(const AuthorizationSet& key_desc, KeyFormat format,
                         const string& key_material, vector<uint8_t>* key_blob,
-                        KeyCharacteristics* key_characteristics);
+                        vector<KeyCharacteristics>* key_characteristics);
     ErrorCode ImportKey(const AuthorizationSet& key_desc, KeyFormat format,
                         const string& key_material);
 
@@ -147,8 +147,8 @@
 
     std::pair<ErrorCode, vector<uint8_t>> UpgradeKey(const vector<uint8_t>& key_blob);
 
-    bool IsSecure() { return securityLevel_ != SecurityLevel::SOFTWARE; }
-    SecurityLevel SecLevel() { return securityLevel_; }
+    bool IsSecure() const { return securityLevel_ != SecurityLevel::SOFTWARE; }
+    SecurityLevel SecLevel() const { return securityLevel_; }
 
     vector<uint32_t> ValidKeySizes(Algorithm algorithm);
     vector<uint32_t> InvalidKeySizes(Algorithm algorithm);
@@ -164,9 +164,15 @@
     }
 
     std::shared_ptr<IKeyMintOperation> op_;
-    vector<Certificate> certChain_;
+    vector<Certificate> cert_chain_;
     vector<uint8_t> key_blob_;
-    KeyCharacteristics key_characteristics_;
+    vector<KeyCharacteristics> key_characteristics_;
+
+    const vector<KeyParameter>& SecLevelAuthorizations(
+            const vector<KeyCharacteristics>& key_characteristics);
+    inline const vector<KeyParameter>& SecLevelAuthorizations() {
+        return SecLevelAuthorizations(key_characteristics_);
+    }
 
   private:
     std::shared_ptr<IKeyMintDevice> keymint_;
diff --git a/security/keymint/aidl/vts/functional/KeyMintTest.cpp b/security/keymint/aidl/vts/functional/KeyMintTest.cpp
index eeb7491..bd36b8e 100644
--- a/security/keymint/aidl/vts/functional/KeyMintTest.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintTest.cpp
@@ -56,18 +56,16 @@
 template <>
 struct std::equal_to<KeyCharacteristics> {
     bool operator()(const KeyCharacteristics& a, const KeyCharacteristics& b) const {
-        // This isn't very efficient. Oh, well.
-        AuthorizationSet a_sw(a.softwareEnforced);
-        AuthorizationSet b_sw(b.softwareEnforced);
-        AuthorizationSet a_tee(b.hardwareEnforced);
-        AuthorizationSet b_tee(b.hardwareEnforced);
+        if (a.securityLevel != b.securityLevel) return false;
 
-        a_sw.Sort();
-        b_sw.Sort();
-        a_tee.Sort();
-        b_tee.Sort();
+        // this isn't very efficient. Oh, well.
+        AuthorizationSet a_auths(a.authorizations);
+        AuthorizationSet b_auths(b.authorizations);
 
-        return ((a_sw == b_sw) && (a_tee == b_tee));
+        a_auths.Sort();
+        b_auths.Sort();
+
+        return a_auths == b_auths;
     }
 };
 
@@ -229,19 +227,20 @@
 
 class NewKeyGenerationTest : public KeyMintAidlTestBase {
   protected:
-    void CheckBaseParams(const KeyCharacteristics& keyCharacteristics) {
+    void CheckBaseParams(const vector<KeyCharacteristics>& keyCharacteristics) {
         // TODO(swillden): Distinguish which params should be in which auth list.
 
-        AuthorizationSet auths(keyCharacteristics.hardwareEnforced);
-        auths.push_back(AuthorizationSet(keyCharacteristics.softwareEnforced));
+        AuthorizationSet auths;
+        for (auto& entry : keyCharacteristics) {
+            auths.push_back(AuthorizationSet(entry.authorizations));
+        }
 
         EXPECT_TRUE(auths.Contains(TAG_ORIGIN, KeyOrigin::GENERATED));
         EXPECT_TRUE(auths.Contains(TAG_PURPOSE, KeyPurpose::SIGN));
         EXPECT_TRUE(auths.Contains(TAG_PURPOSE, KeyPurpose::VERIFY));
 
-        // Verify that App ID, App data and ROT are NOT included.
+        // Verify that App data and ROT are NOT included.
         EXPECT_FALSE(auths.Contains(TAG_ROOT_OF_TRUST));
-        EXPECT_FALSE(auths.Contains(TAG_APPLICATION_ID));
         EXPECT_FALSE(auths.Contains(TAG_APPLICATION_DATA));
 
         // Check that some unexpected tags/values are NOT present.
@@ -249,15 +248,13 @@
         EXPECT_FALSE(auths.Contains(TAG_PURPOSE, KeyPurpose::DECRYPT));
         EXPECT_FALSE(auths.Contains(TAG_AUTH_TIMEOUT, 301U));
 
-        // Now check that unspecified, defaulted tags are correct.
-        EXPECT_TRUE(auths.Contains(TAG_CREATION_DATETIME));
+        auto os_ver = auths.GetTagValue(TAG_OS_VERSION);
+        ASSERT_TRUE(os_ver);
+        EXPECT_EQ(*os_ver, os_version());
 
-        EXPECT_TRUE(auths.Contains(TAG_OS_VERSION, os_version()))
-                << "OS version is " << os_version() << " key reported "
-                << auths.GetTagValue(TAG_OS_VERSION)->get();
-        EXPECT_TRUE(auths.Contains(TAG_OS_PATCHLEVEL, os_patch_level()))
-                << "OS patch level is " << os_patch_level() << " key reported "
-                << auths.GetTagValue(TAG_OS_PATCHLEVEL)->get();
+        auto os_pl = auths.GetTagValue(TAG_OS_PATCHLEVEL);
+        ASSERT_TRUE(os_pl);
+        EXPECT_EQ(*os_pl, os_patch_level());
     }
 };
 
@@ -270,7 +267,7 @@
 TEST_P(NewKeyGenerationTest, Rsa) {
     for (auto key_size : ValidKeySizes(Algorithm::RSA)) {
         vector<uint8_t> key_blob;
-        KeyCharacteristics key_characteristics;
+        vector<KeyCharacteristics> key_characteristics;
         ASSERT_EQ(ErrorCode::OK, GenerateKey(AuthorizationSetBuilder()
                                                      .RsaSigningKey(key_size, 65537)
                                                      .Digest(Digest::NONE)
@@ -280,12 +277,7 @@
         ASSERT_GT(key_blob.size(), 0U);
         CheckBaseParams(key_characteristics);
 
-        AuthorizationSet crypto_params;
-        if (IsSecure()) {
-            crypto_params = key_characteristics.hardwareEnforced;
-        } else {
-            crypto_params = key_characteristics.softwareEnforced;
-        }
+        AuthorizationSet crypto_params = SecLevelAuthorizations(key_characteristics);
 
         EXPECT_TRUE(crypto_params.Contains(TAG_ALGORITHM, Algorithm::RSA));
         EXPECT_TRUE(crypto_params.Contains(TAG_KEY_SIZE, key_size))
@@ -304,7 +296,7 @@
 TEST_P(NewKeyGenerationTest, NoInvalidRsaSizes) {
     for (auto key_size : InvalidKeySizes(Algorithm::RSA)) {
         vector<uint8_t> key_blob;
-        KeyCharacteristics key_characteristics;
+        vector<KeyCharacteristics> key_characteristics;
         ASSERT_EQ(ErrorCode::UNSUPPORTED_KEY_SIZE,
                   GenerateKey(AuthorizationSetBuilder()
                                       .RsaSigningKey(key_size, 65537)
@@ -337,7 +329,7 @@
 TEST_P(NewKeyGenerationTest, Ecdsa) {
     for (auto key_size : ValidKeySizes(Algorithm::EC)) {
         vector<uint8_t> key_blob;
-        KeyCharacteristics key_characteristics;
+        vector<KeyCharacteristics> key_characteristics;
         ASSERT_EQ(ErrorCode::OK,
                   GenerateKey(
                           AuthorizationSetBuilder().EcdsaSigningKey(key_size).Digest(Digest::NONE),
@@ -345,12 +337,7 @@
         ASSERT_GT(key_blob.size(), 0U);
         CheckBaseParams(key_characteristics);
 
-        AuthorizationSet crypto_params;
-        if (IsSecure()) {
-            crypto_params = key_characteristics.hardwareEnforced;
-        } else {
-            crypto_params = key_characteristics.softwareEnforced;
-        }
+        AuthorizationSet crypto_params = SecLevelAuthorizations(key_characteristics);
 
         EXPECT_TRUE(crypto_params.Contains(TAG_ALGORITHM, Algorithm::EC));
         EXPECT_TRUE(crypto_params.Contains(TAG_KEY_SIZE, key_size))
@@ -383,7 +370,7 @@
 TEST_P(NewKeyGenerationTest, EcdsaInvalidSize) {
     for (auto key_size : InvalidKeySizes(Algorithm::EC)) {
         vector<uint8_t> key_blob;
-        KeyCharacteristics key_characteristics;
+        vector<KeyCharacteristics> key_characteristics;
         ASSERT_EQ(ErrorCode::UNSUPPORTED_KEY_SIZE,
                   GenerateKey(
                           AuthorizationSetBuilder().EcdsaSigningKey(key_size).Digest(Digest::NONE),
@@ -454,7 +441,7 @@
 TEST_P(NewKeyGenerationTest, Hmac) {
     for (auto digest : ValidDigests(false /* withNone */, true /* withMD5 */)) {
         vector<uint8_t> key_blob;
-        KeyCharacteristics key_characteristics;
+        vector<KeyCharacteristics> key_characteristics;
         constexpr size_t key_size = 128;
         ASSERT_EQ(ErrorCode::OK,
                   GenerateKey(
@@ -465,17 +452,10 @@
         ASSERT_GT(key_blob.size(), 0U);
         CheckBaseParams(key_characteristics);
 
-        AuthorizationSet hardwareEnforced = key_characteristics.hardwareEnforced;
-        AuthorizationSet softwareEnforced = key_characteristics.softwareEnforced;
-        if (IsSecure()) {
-            EXPECT_TRUE(hardwareEnforced.Contains(TAG_ALGORITHM, Algorithm::HMAC));
-            EXPECT_TRUE(hardwareEnforced.Contains(TAG_KEY_SIZE, key_size))
-                    << "Key size " << key_size << "missing";
-        } else {
-            EXPECT_TRUE(softwareEnforced.Contains(TAG_ALGORITHM, Algorithm::HMAC));
-            EXPECT_TRUE(softwareEnforced.Contains(TAG_KEY_SIZE, key_size))
-                    << "Key size " << key_size << "missing";
-        }
+        AuthorizationSet crypto_params = SecLevelAuthorizations(key_characteristics);
+        EXPECT_TRUE(crypto_params.Contains(TAG_ALGORITHM, Algorithm::HMAC));
+        EXPECT_TRUE(crypto_params.Contains(TAG_KEY_SIZE, key_size))
+                << "Key size " << key_size << "missing";
 
         CheckedDeleteKey(&key_blob);
     }
@@ -600,7 +580,7 @@
 /*
  * SigningOperationsTest.RsaUseRequiresCorrectAppIdAppData
  *
- * Verifies that using an RSA key requires the correct app ID/data.
+ * Verifies that using an RSA key requires the correct app data.
  */
 TEST_P(SigningOperationsTest, RsaUseRequiresCorrectAppIdAppData) {
     ASSERT_EQ(ErrorCode::OK, GenerateKey(AuthorizationSetBuilder()
@@ -1412,7 +1392,7 @@
     string key_material = "HelloThisIsAKey";
 
     vector<uint8_t> signing_key, verification_key;
-    KeyCharacteristics signing_key_chars, verification_key_chars;
+    vector<KeyCharacteristics> signing_key_chars, verification_key_chars;
     EXPECT_EQ(ErrorCode::OK,
               ImportKey(AuthorizationSetBuilder()
                                 .Authorization(TAG_NO_AUTH_REQUIRED)
@@ -1466,28 +1446,22 @@
     template <TagType tag_type, Tag tag, typename ValueT>
     void CheckCryptoParam(TypedTag<tag_type, tag> ttag, ValueT expected) {
         SCOPED_TRACE("CheckCryptoParam");
-        if (IsSecure()) {
-            EXPECT_TRUE(contains(key_characteristics_.hardwareEnforced, ttag, expected))
-                    << "Tag " << tag << " with value " << expected << " not found";
-            EXPECT_FALSE(contains(key_characteristics_.softwareEnforced, ttag))
-                    << "Tag " << tag << " found";
-        } else {
-            EXPECT_TRUE(contains(key_characteristics_.softwareEnforced, ttag, expected))
-                    << "Tag " << tag << " with value " << expected << " not found";
-            EXPECT_FALSE(contains(key_characteristics_.hardwareEnforced, ttag))
-                    << "Tag " << tag << " found";
+        for (auto& entry : key_characteristics_) {
+            if (entry.securityLevel == SecLevel()) {
+                EXPECT_TRUE(contains(entry.authorizations, ttag, expected))
+                        << "Tag " << tag << " with value " << expected
+                        << " not found at security level" << entry.securityLevel;
+            } else {
+                EXPECT_FALSE(contains(entry.authorizations, ttag, expected))
+                        << "Tag " << tag << " found at security level " << entry.securityLevel;
+            }
         }
     }
 
     void CheckOrigin() {
         SCOPED_TRACE("CheckOrigin");
-        if (IsSecure()) {
-            EXPECT_TRUE(contains(key_characteristics_.hardwareEnforced, TAG_ORIGIN,
-                                 KeyOrigin::IMPORTED));
-        } else {
-            EXPECT_TRUE(contains(key_characteristics_.softwareEnforced, TAG_ORIGIN,
-                                 KeyOrigin::IMPORTED));
-        }
+        // Origin isn't a crypto param, but it always lives with them.
+        return CheckCryptoParam(TAG_ORIGIN, KeyOrigin::IMPORTED);
     }
 };
 
@@ -3950,7 +3924,7 @@
 
     // Delete must work if rollback protection is implemented
     if (error == ErrorCode::OK) {
-        AuthorizationSet hardwareEnforced(key_characteristics_.hardwareEnforced);
+        AuthorizationSet hardwareEnforced(SecLevelAuthorizations());
         ASSERT_TRUE(hardwareEnforced.Contains(TAG_ROLLBACK_RESISTANCE));
 
         ASSERT_EQ(ErrorCode::OK, DeleteKey(true /* keep key blob */));
@@ -3983,8 +3957,8 @@
 
     // Delete must work if rollback protection is implemented
     if (error == ErrorCode::OK) {
-        AuthorizationSet hardwareEnforced(key_characteristics_.hardwareEnforced);
-        ASSERT_TRUE(hardwareEnforced.Contains(TAG_ROLLBACK_RESISTANCE));
+        AuthorizationSet enforced(SecLevelAuthorizations());
+        ASSERT_TRUE(enforced.Contains(TAG_ROLLBACK_RESISTANCE));
 
         // Delete the key we don't care about the result at this point.
         DeleteKey();
@@ -4019,7 +3993,7 @@
 
     // Delete must work if rollback protection is implemented
     if (error == ErrorCode::OK) {
-        AuthorizationSet hardwareEnforced(key_characteristics_.hardwareEnforced);
+        AuthorizationSet hardwareEnforced(SecLevelAuthorizations());
         ASSERT_TRUE(hardwareEnforced.Contains(TAG_ROLLBACK_RESISTANCE));
 
         ASSERT_EQ(ErrorCode::OK, DeleteAllKeys());
diff --git a/security/keymint/support/include/keymint_support/key_param_output.h b/security/keymint/support/include/keymint_support/key_param_output.h
index 5f004fe..c2b0029 100644
--- a/security/keymint/support/include/keymint_support/key_param_output.h
+++ b/security/keymint/support/include/keymint_support/key_param_output.h
@@ -84,8 +84,10 @@
 ::std::ostream& operator<<(::std::ostream& os, const KeyParameter& param);
 
 inline ::std::ostream& operator<<(::std::ostream& os, const KeyCharacteristics& value) {
-    return os << "SW: " << value.softwareEnforced << ::std::endl
-              << "HW: " << value.hardwareEnforced << ::std::endl;
+    for (auto& entry : value.authorizations) {
+        os << value.securityLevel << ": " << entry;
+    }
+    return os;
 }
 
 inline ::std::ostream& operator<<(::std::ostream& os, KeyPurpose value) {
diff --git a/security/secureclock/aidl/Android.bp b/security/secureclock/aidl/Android.bp
new file mode 100644
index 0000000..7d26a9b
--- /dev/null
+++ b/security/secureclock/aidl/Android.bp
@@ -0,0 +1,24 @@
+aidl_interface {
+    name: "android.hardware.security.secureclock",
+    vendor_available: true,
+    srcs: [
+        "android/hardware/security/secureclock/*.aidl",
+    ],
+    stability: "vintf",
+    imports: [
+        "android.hardware.security.keymint",
+    ],
+    backend: {
+        java: {
+            sdk_version: "module_current",
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+        rust: {
+            enabled: true,
+        },
+    },
+}
diff --git a/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/ISecureClock.aidl b/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/ISecureClock.aidl
new file mode 100644
index 0000000..c16b312
--- /dev/null
+++ b/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/ISecureClock.aidl
@@ -0,0 +1,24 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.security.secureclock;
+@VintfStability
+interface ISecureClock {
+  android.hardware.security.secureclock.TimeStampToken generateTimeStamp(in long challenge);
+  const String TIME_STAMP_MAC_LABEL = "Time Verification";
+}
diff --git a/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/TimeStampToken.aidl b/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/TimeStampToken.aidl
new file mode 100644
index 0000000..c23ddca
--- /dev/null
+++ b/security/secureclock/aidl/aidl_api/android.hardware.security.secureclock/current/android/hardware/security/secureclock/TimeStampToken.aidl
@@ -0,0 +1,26 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.security.secureclock;
+@VintfStability
+parcelable TimeStampToken {
+  long challenge;
+  android.hardware.security.keymint.Timestamp timestamp;
+  android.hardware.security.keymint.SecurityLevel securityLevel;
+  byte[] mac;
+}
diff --git a/security/secureclock/aidl/android/hardware/security/secureclock/ISecureClock.aidl b/security/secureclock/aidl/android/hardware/security/secureclock/ISecureClock.aidl
new file mode 100644
index 0000000..7d416dd
--- /dev/null
+++ b/security/secureclock/aidl/android/hardware/security/secureclock/ISecureClock.aidl
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * limitations under the License.
+ */
+
+package android.hardware.security.secureclock;
+import android.hardware.security.secureclock.TimeStampToken;
+
+/**
+ * Secure Clock definition.
+ *
+ * An ISecureClock provides a keymint service to generate secure timestamp using a secure platform.
+ * The secure time stamp contains time in milliseconds. This time stamp also contains a 256-bit MAC
+ * which provides integrity protection. The MAC is generated using HMAC-SHA-256 and a shared
+ * secret. The shared secret must be available to secure clock service by implementing
+ * ISharedSecret aidl. Note: ISecureClock depends on the shared secret, without which the secure
+ * time stamp token cannot be generated.
+ */
+
+@VintfStability
+interface ISecureClock {
+    /**
+     * String used as context in the HMAC computation signing the generated time stamp.
+     * See TimeStampToken.mac for details.
+     */
+    const String TIME_STAMP_MAC_LABEL = "Time Verification";
+
+    /**
+     * Generates an authenticated timestamp.
+     *
+     * @param A challenge value provided by the relying party. It will be included in the generated
+     *        TimeStampToken to ensure freshness. The relying service must ensure that the
+     *        challenge cannot be specified or predicted by an attacker.
+     *
+     * @return the TimeStampToken, see the definition for details.
+     */
+    TimeStampToken generateTimeStamp(in long challenge);
+}
diff --git a/security/secureclock/aidl/android/hardware/security/secureclock/TimeStampToken.aidl b/security/secureclock/aidl/android/hardware/security/secureclock/TimeStampToken.aidl
new file mode 100644
index 0000000..76a2d28
--- /dev/null
+++ b/security/secureclock/aidl/android/hardware/security/secureclock/TimeStampToken.aidl
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.security.secureclock;
+
+import android.hardware.security.keymint.SecurityLevel;
+import android.hardware.security.keymint.Timestamp;
+
+/**
+ * TimeStampToken instances are used for secure environments that requires secure time information.
+ */
+
+@VintfStability
+parcelable TimeStampToken {
+    /**
+     * The challenge that was provided as argument to ISecureClock.generateTimeStamp by the client.
+     */
+    long challenge;
+
+    /**
+     * The current time of the secure environment that generates the TimeStampToken.
+     */
+    Timestamp timestamp;
+
+    /**
+     * SecurityLevel of the secure environment that generated the token.
+     */
+    SecurityLevel securityLevel;
+
+    /**
+     * 32-byte HMAC-SHA256 of the above values, computed as:
+     *
+     *    HMAC(H,
+     *         ISecureClock.TIME_STAMP_MAC_LABEL || challenge || timestamp)
+     *
+     * where:
+     *
+     *   ``ISecureClock.TIME_STAMP_MAC_LABEL'' is a sting constant defined in ISecureClock.aidl.
+     *
+     *   ``H'' is the shared HMAC key (see computeSharedHmac() in ISharedHmacSecret).
+     *
+     *   ``||'' represents concatenation
+     *
+     * The representation of challenge and timestamp is as 64-bit unsigned integers in big-endian
+     * order.  securityLevel is represented as a 32-bit unsigned integer in big-endian order.
+     */
+    byte[] mac;
+}
diff --git a/security/sharedsecret/aidl/Android.bp b/security/sharedsecret/aidl/Android.bp
new file mode 100644
index 0000000..ab44110
--- /dev/null
+++ b/security/sharedsecret/aidl/Android.bp
@@ -0,0 +1,21 @@
+aidl_interface {
+    name: "android.hardware.security.sharedsecret",
+    vendor_available: true,
+    srcs: [
+        "android/hardware/security/sharedsecret/*.aidl",
+    ],
+    stability: "vintf",
+    backend: {
+        java: {
+            sdk_version: "module_current",
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+        rust: {
+            enabled: true,
+        },
+    },
+}
diff --git a/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/ISharedSecret.aidl b/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/ISharedSecret.aidl
new file mode 100644
index 0000000..2509936
--- /dev/null
+++ b/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/ISharedSecret.aidl
@@ -0,0 +1,26 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.security.sharedsecret;
+@VintfStability
+interface ISharedSecret {
+  android.hardware.security.sharedsecret.SharedSecretParameters getSharedSecretParameters();
+  byte[] computeSharedSecret(in android.hardware.security.sharedsecret.SharedSecretParameters[] params);
+  const String KEY_AGREEMENT_LABEL = "KeymasterSharedMac";
+  const String KEY_CHECK_LABEL = "Keymaster HMAC Verification";
+}
diff --git a/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/SharedSecretParameters.aidl b/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/SharedSecretParameters.aidl
new file mode 100644
index 0000000..9b65046
--- /dev/null
+++ b/security/sharedsecret/aidl/aidl_api/android.hardware.security.sharedsecret/current/android/hardware/security/sharedsecret/SharedSecretParameters.aidl
@@ -0,0 +1,24 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.security.sharedsecret;
+@VintfStability
+parcelable SharedSecretParameters {
+  byte[] seed;
+  byte[] nonce;
+}
diff --git a/security/sharedsecret/aidl/android/hardware/security/sharedsecret/ISharedSecret.aidl b/security/sharedsecret/aidl/android/hardware/security/sharedsecret/ISharedSecret.aidl
new file mode 100644
index 0000000..906303f
--- /dev/null
+++ b/security/sharedsecret/aidl/android/hardware/security/sharedsecret/ISharedSecret.aidl
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * limitations under the License.
+ */
+
+package android.hardware.security.sharedsecret;
+import android.hardware.security.sharedsecret.SharedSecretParameters;
+
+/**
+ * Shared Secret definition.
+ *
+ * An ISharedSecret enables any service that implements this interface to establish a shared secret
+ * with one or more other services such as ISecureClock, TEE IKeymintDevice, StrongBox
+ * IKeymintDevice, etc. The shared secret is a 256-bit HMAC key and it is further used to generate
+ * secure tokens with integrity protection. There are two steps to establish a shared secret between
+ * the collaborating services:
+ *
+ * Step 1: During Android startup the system calls each service that implements this interface to
+ * get the shared secret parameters. This is done using getSharedSecretParameters method defined
+ * below.
+ * Step 2: The system lexicographically sorts the shared secret parameters received from each
+ * service and then sends these sorted parameter list to each service in a computeSharedSecret
+ * method defined below. The services individually computes the shared secret and returns back
+ * the 32 byte sharing check hash value generated by using the computed shared secret.
+ * Step 3: The system collects sharing check hash values from each service and evaluates them. If
+ * they are all equal, then the shared secret generation is considered to be successful else it is
+ * considered to have failed.
+ */
+
+@VintfStability
+interface ISharedSecret {
+    /**
+     * String used as label in the shared key derivation. See computeSharedSecret below.
+     */
+    const String KEY_AGREEMENT_LABEL = "KeymasterSharedMac";
+
+    /**
+     * String used as context in the computation of the sharingCheck. See computeSharedSecret
+     * below.
+     */
+    const String KEY_CHECK_LABEL = "Keymaster HMAC Verification";
+
+    /**
+     * This method is the first step in the process for agreeing on a shared key.  It is called by
+     * Android during startup.  The system calls it on each of the HAL instances and collects the
+     * results in preparation for the second step.
+     *
+     * @return The SharedSecretParameters to use.  As specified in the SharedSecretParameters
+     *         documentation, the seed must contain the same value in every invocation
+     *         of the method on a given device, and the nonce must return the same value for every
+     *         invocation during a boot session.
+     */
+    SharedSecretParameters getSharedSecretParameters();
+
+    /**
+     * This method is the second and final step in the process for agreeing on a shared key.  It is
+     * called by Android during startup.  The system calls it on each of the keymint services, and
+     * sends to it all of the SharedSecretParameters returned by all keymint services.
+     *
+     * This method computes the shared 32-byte HMAC key ``H'' as follows (all keymint services
+     * instances perform the same computation to arrive at the same result):
+     *
+     *     H = CKDF(key = K,
+     *              context = P1 || P2 || ... || Pn,
+     *              label = KEY_AGREEMENT_LABEL)
+     *
+     * where:
+     *
+     *     ``CKDF'' is the standard AES-CMAC KDF from NIST SP 800-108 in counter mode (see Section
+     *           5.1 of the referenced publication).  ``key'', ``context'', and ``label'' are
+     *           defined in the standard.  The counter is prefixed and length L appended, as shown
+     *           in the construction on page 12 of the standard.  The label string is UTF-8 encoded.
+     *
+     *     ``K'' is a pre-established shared secret, set up during factory reset.  The mechanism for
+     *           establishing this shared secret is implementation-defined.Any method of securely
+     *           establishing K that ensures that an attacker cannot obtain or derive its value is
+     *           acceptable.
+     *
+     *           CRITICAL SECURITY REQUIREMENT: All keys created by a IKeymintDevice instance must
+     *           be cryptographically bound to the value of K, such that establishing a new K
+     *           permanently destroys them.
+     *
+     *     ``||'' represents concatenation.
+     *
+     *     ``Pi'' is the i'th SharedSecretParameters value in the params vector. Encoding of an
+     *           SharedSecretParameters is the concatenation of its two fields, i.e. seed || nonce.
+     *
+     * Note that the label "KeymasterSharedMac" is the 18-byte UTF-8 encoding of the string.
+     *
+     * @param params is an array of SharedSecretParameters The lexicographically sorted
+     * SharedSecretParameters data returned by all keymint services when getSharedSecretParameters
+     * was called.
+     *
+     * @return sharingCheck A 32-byte value used to verify that all the keymint services have
+     *         computed the same shared HMAC key.  The sharingCheck value is computed as follows:
+     *
+     *             sharingCheck = HMAC(H, KEY_CHECK_LABEL)
+     *
+     *         The string is UTF-8 encoded, 27 bytes in length.  If the returned values of all
+     *         keymint services don't match, clients must assume that HMAC agreement
+     *         failed.
+     */
+    byte[] computeSharedSecret(in SharedSecretParameters[] params);
+}
diff --git a/security/sharedsecret/aidl/android/hardware/security/sharedsecret/SharedSecretParameters.aidl b/security/sharedsecret/aidl/android/hardware/security/sharedsecret/SharedSecretParameters.aidl
new file mode 100644
index 0000000..691b3f1
--- /dev/null
+++ b/security/sharedsecret/aidl/android/hardware/security/sharedsecret/SharedSecretParameters.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.security.sharedsecret;
+
+/**
+ * SharedSecretParameters holds the data used in the process of establishing a shared secret i.e.
+ * HMAC key between multiple keymint services.  These parameters are returned in by
+ * getSharedSecretParameters() and send to computeShareSecret().  See the named methods in
+ * ISharedSecret for details of usage.
+ */
+
+@VintfStability
+parcelable SharedSecretParameters {
+    /**
+     * Either empty or contains a non zero persistent value that is associated with the pre-shared
+     * HMAC agreement key.  It is either empty or 32 bytes in length.
+     */
+    byte[] seed;
+
+    /**
+     * A 32-byte value which is guaranteed to be different each time
+     * getSharedSecretParameters() is called.  Probabilistic uniqueness (i.e. random) is acceptable,
+     * though a stronger uniqueness guarantee (e.g. counter) is recommended where possible.
+     */
+    byte[] nonce;
+}
diff --git a/tests/lazy/1.1/ILazy.hal b/tests/lazy/1.1/ILazy.hal
index a15e0e3..b0a6a2a 100644
--- a/tests/lazy/1.1/ILazy.hal
+++ b/tests/lazy/1.1/ILazy.hal
@@ -18,4 +18,12 @@
 
 import android.hardware.tests.lazy@1.0;
 
-interface ILazy extends @1.0::ILazy {};
+interface ILazy extends @1.0::ILazy {
+    /**
+     * Ask the process hosting the service to install a callback that notifies
+     * it when the number of active (i.e. with clients) services changes.
+     * For testing purposes, this callback exercises the code to unregister/re-register
+     * the services and eventually shuts down the process.
+     */
+    setCustomActiveServicesCountCallback();
+};
diff --git a/tv/input/1.0/default/TvInput.cpp b/tv/input/1.0/default/TvInput.cpp
index 4ea1dec..7583a67 100644
--- a/tv/input/1.0/default/TvInput.cpp
+++ b/tv/input/1.0/default/TvInput.cpp
@@ -142,7 +142,7 @@
 
 // static
 void TvInput::notify(struct tv_input_device* __unused, tv_input_event_t* event,
-        void* __unused) {
+                     void* optionalStatus) {
     if (mCallback != nullptr && event != nullptr) {
         // Capturing is no longer supported.
         if (event->type >= TV_INPUT_EVENT_CAPTURE_SUCCEEDED) {
@@ -154,7 +154,17 @@
         tvInputEvent.deviceInfo.type = static_cast<TvInputType>(
                 event->device_info.type);
         tvInputEvent.deviceInfo.portId = event->device_info.hdmi.port_id;
-        tvInputEvent.deviceInfo.cableConnectionStatus = CableConnectionStatus::UNKNOWN;
+        CableConnectionStatus connectionStatus = CableConnectionStatus::UNKNOWN;
+        if (optionalStatus != nullptr &&
+            ((event->type == TV_INPUT_EVENT_STREAM_CONFIGURATIONS_CHANGED) ||
+             (event->type == TV_INPUT_EVENT_DEVICE_AVAILABLE))) {
+            int newStatus = *reinterpret_cast<int*>(optionalStatus);
+            if (newStatus <= static_cast<int>(CableConnectionStatus::DISCONNECTED) &&
+                newStatus >= static_cast<int>(CableConnectionStatus::UNKNOWN)) {
+                connectionStatus = static_cast<CableConnectionStatus>(newStatus);
+            }
+        }
+        tvInputEvent.deviceInfo.cableConnectionStatus = connectionStatus;
         // TODO: Ensure the legacy audio type code is the same once audio HAL default
         // implementation is ready.
         tvInputEvent.deviceInfo.audioType = static_cast<AudioDevice>(