diff --git a/camera/common/1.0/default/Android.bp b/camera/common/1.0/default/Android.bp
index 03a71fa..6209cb8 100644
--- a/camera/common/1.0/default/Android.bp
+++ b/camera/common/1.0/default/Android.bp
@@ -1,10 +1,11 @@
 cc_library_static {
     name: "android.hardware.camera.common@1.0-helper",
-    vendor: true,
+    vendor_available: true,
     defaults: ["hidl_defaults"],
     srcs: [
         "CameraModule.cpp",
         "CameraMetadata.cpp",
+        "CameraParameters.cpp",
         "VendorTagDescriptor.cpp",
         "HandleImporter.cpp"],
     cflags: [
diff --git a/camera/provider/2.4/vts/functional/CameraParameters.cpp b/camera/common/1.0/default/CameraParameters.cpp
similarity index 98%
rename from camera/provider/2.4/vts/functional/CameraParameters.cpp
rename to camera/common/1.0/default/CameraParameters.cpp
index 97b263b..d224483 100644
--- a/camera/provider/2.4/vts/functional/CameraParameters.cpp
+++ b/camera/common/1.0/default/CameraParameters.cpp
@@ -24,6 +24,12 @@
 #include <system/graphics.h>
 
 namespace android {
+namespace hardware {
+namespace camera {
+namespace common {
+namespace V1_0 {
+namespace helper {
+
 // Parameter keys to communicate between camera application and driver.
 const char CameraParameters::KEY_PREVIEW_SIZE[] = "preview-size";
 const char CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES[] = "preview-size-values";
@@ -534,4 +540,9 @@
     return mMap.isEmpty();
 }
 
+};
+};
+};
+};
+};
 }; // namespace android
diff --git a/camera/provider/2.4/vts/functional/CameraParameters.h b/camera/common/1.0/default/include/CameraParameters.h
similarity index 99%
rename from camera/provider/2.4/vts/functional/CameraParameters.h
rename to camera/common/1.0/default/include/CameraParameters.h
index ba33ffe..e4ff6f2 100644
--- a/camera/provider/2.4/vts/functional/CameraParameters.h
+++ b/camera/common/1.0/default/include/CameraParameters.h
@@ -21,6 +21,11 @@
 #include <utils/String8.h>
 
 namespace android {
+namespace hardware {
+namespace camera {
+namespace common {
+namespace V1_0 {
+namespace helper {
 
 struct Size {
     int width;
@@ -694,6 +699,11 @@
     DefaultKeyedVector<String8,String8>    mMap;
 };
 
-}; // namespace android
+};
+};
+};
+};
+};
+}; // namespace
 
 #endif
diff --git a/camera/provider/2.4/vts/functional/Android.bp b/camera/provider/2.4/vts/functional/Android.bp
index 85312c1..eae58ef 100644
--- a/camera/provider/2.4/vts/functional/Android.bp
+++ b/camera/provider/2.4/vts/functional/Android.bp
@@ -17,8 +17,7 @@
 cc_test {
     name: "VtsHalCameraProviderV2_4TargetTest",
     defaults: ["hidl_defaults"],
-    srcs: ["VtsHalCameraProviderV2_4TargetTest.cpp",
-           "CameraParameters.cpp" ],
+    srcs: ["VtsHalCameraProviderV2_4TargetTest.cpp"],
     shared_libs: [
         "liblog",
         "libhidlbase",
@@ -33,7 +32,11 @@
         "libgui",
         "libui"
     ],
-    static_libs: ["VtsHalHidlTargetTestBase", "libgrallocusage"],
+    static_libs: [
+        "VtsHalHidlTargetTestBase",
+        "libgrallocusage",
+        "android.hardware.camera.common@1.0-helper",
+    ],
     cflags: [
         "-O0",
         "-g",
diff --git a/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp b/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
index 8695e4e..49281f5 100644
--- a/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
+++ b/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
@@ -36,7 +36,7 @@
 #include <mutex>
 #include <regex>
 #include <unordered_map>
-#include "CameraParameters.h"
+#include <CameraParameters.h>
 #include "system/camera_metadata.h"
 
 using ::android::hardware::Return;
@@ -52,13 +52,14 @@
 using ::android::BufferQueue;
 using ::android::BufferItemConsumer;
 using ::android::Surface;
-using ::android::CameraParameters;
 using ::android::hardware::graphics::common::V1_0::BufferUsage;
 using ::android::hardware::graphics::common::V1_0::PixelFormat;
 using ::android::hardware::camera::common::V1_0::Status;
 using ::android::hardware::camera::common::V1_0::CameraDeviceStatus;
 using ::android::hardware::camera::common::V1_0::TorchMode;
 using ::android::hardware::camera::common::V1_0::TorchModeStatus;
+using ::android::hardware::camera::common::V1_0::helper::CameraParameters;
+using ::android::hardware::camera::common::V1_0::helper::Size;
 using ::android::hardware::camera::provider::V2_4::ICameraProvider;
 using ::android::hardware::camera::provider::V2_4::ICameraProviderCallback;
 using ::android::hardware::camera::device::V3_2::ICameraDevice;
@@ -564,7 +565,7 @@
             const std::vector<AvailableStream> &streamSizes,
             int32_t format, AvailableStream &result);
     static Status isAutoFocusModeAvailable(
-            ::android::CameraParameters &cameraParams, const char *mode) ;
+            CameraParameters &cameraParams, const char *mode) ;
 
 protected:
     std::mutex mLock;                          // Synchronize access to member variables
@@ -1333,7 +1334,7 @@
             openCameraDevice(name, env, &device1 /*out*/);
             ASSERT_NE(nullptr, device1.get());
 
-            ::android::CameraParameters cameraParams;
+            CameraParameters cameraParams;
             getParameters(device1, &cameraParams /*out*/);
 
             if (Status::OK != isAutoFocusModeAvailable(cameraParams,
@@ -1395,7 +1396,7 @@
             openCameraDevice(name, env, &device1 /*out*/);
             ASSERT_NE(nullptr, device1.get());
 
-            ::android::CameraParameters cameraParams;
+            CameraParameters cameraParams;
             getParameters(device1, &cameraParams /*out*/);
 
             if (Status::OK != isAutoFocusModeAvailable(cameraParams,
@@ -1443,7 +1444,7 @@
             openCameraDevice(name, env, &device1 /*out*/);
             ASSERT_NE(nullptr, device1.get());
 
-            ::android::CameraParameters cameraParams;
+            CameraParameters cameraParams;
             getParameters(device1, &cameraParams /*out*/);
 
             int32_t hwFaces = cameraParams.getInt(
@@ -1506,7 +1507,7 @@
             openCameraDevice(name, env, &device1 /*out*/);
             ASSERT_NE(nullptr, device1.get());
 
-            ::android::CameraParameters cameraParams;
+            CameraParameters cameraParams;
             getParameters(device1, &cameraParams /*out*/);
 
             const char *smoothZoomStr = cameraParams.get(
@@ -1557,7 +1558,7 @@
             openCameraDevice(name, env, &device1 /*out*/);
             ASSERT_NE(nullptr, device1.get());
 
-            ::android::CameraParameters cameraParams;
+            CameraParameters cameraParams;
             getParameters(device1, &cameraParams /*out*/);
 
             int32_t width, height;
@@ -1587,10 +1588,10 @@
             ASSERT_TRUE((nullptr == effect) || (strcmp(
                     CameraParameters::EFFECT_NONE, effect) == 0));
 
-            ::android::Vector<::android::Size> previewSizes;
+            ::android::Vector<Size> previewSizes;
             cameraParams.getSupportedPreviewSizes(previewSizes);
             ASSERT_FALSE(previewSizes.empty());
-            ::android::Vector<::android::Size> pictureSizes;
+            ::android::Vector<Size> pictureSizes;
             cameraParams.getSupportedPictureSizes(pictureSizes);
             ASSERT_FALSE(pictureSizes.empty());
             const char *previewFormats = cameraParams.get(
@@ -3003,7 +3004,7 @@
 
 // Check whether the camera device supports specific focus mode.
 Status CameraHidlTest::isAutoFocusModeAvailable(
-        ::android::CameraParameters &cameraParams,
+        CameraParameters &cameraParams,
         const char *mode) {
     ::android::String8 focusModes(cameraParams.get(
             CameraParameters::KEY_SUPPORTED_FOCUS_MODES));
diff --git a/drm/1.0/Android.bp b/drm/1.0/Android.bp
index 7829de7..731f58f 100644
--- a/drm/1.0/Android.bp
+++ b/drm/1.0/Android.bp
@@ -89,3 +89,5 @@
         "libutils",
     ],
 }
+
+subdirs = ["default"]
diff --git a/drm/1.0/default/Android.bp b/drm/1.0/default/Android.bp
new file mode 100644
index 0000000..ed6bcde
--- /dev/null
+++ b/drm/1.0/default/Android.bp
@@ -0,0 +1,23 @@
+cc_library_static {
+    name: "android.hardware.drm@1.0-helper",
+    vendor_available: true,
+    defaults: ["hidl_defaults"],
+    srcs: [
+        "SharedLibrary.cpp",
+    ],
+    cflags: [
+        "-Werror",
+        "-Wextra",
+        "-Wall",
+    ],
+    shared_libs: [
+        "liblog",
+    ],
+    header_libs: [
+        "libutils_headers",
+    ],
+    export_header_lib_headers: [
+        "libutils_headers",
+    ],
+    export_include_dirs : ["include"]
+}
diff --git a/drm/1.0/default/Android.mk b/drm/1.0/default/Android.mk
index 7084d1b..7916fba 100644
--- a/drm/1.0/default/Android.mk
+++ b/drm/1.0/default/Android.mk
@@ -36,6 +36,9 @@
   libutils \
   libbinder \
 
+LOCAL_STATIC_LIBRARIES := \
+  android.hardware.drm@1.0-helper \
+
 LOCAL_C_INCLUDES := \
   hardware/interfaces/drm
 
@@ -71,10 +74,12 @@
     libhidlmemory \
     libhidltransport \
     liblog \
-    libmediadrm \
     libstagefright_foundation_vendor \
     libutils \
 
+LOCAL_STATIC_LIBRARIES := \
+    android.hardware.drm@1.0-helper \
+
 LOCAL_C_INCLUDES := \
     frameworks/native/include \
     frameworks/av/include
diff --git a/drm/1.0/default/CryptoFactory.h b/drm/1.0/default/CryptoFactory.h
index 412b557..6b1d1ff 100644
--- a/drm/1.0/default/CryptoFactory.h
+++ b/drm/1.0/default/CryptoFactory.h
@@ -19,7 +19,7 @@
 #include <android/hardware/drm/1.0/ICryptoFactory.h>
 #include <hidl/Status.h>
 #include <media/hardware/CryptoAPI.h>
-#include <media/PluginLoader.h>
+#include <PluginLoader.h>
 #include <media/SharedLibrary.h>
 
 namespace android {
@@ -28,6 +28,7 @@
 namespace V1_0 {
 namespace implementation {
 
+using ::android::hardware::drm::V1_0::helper::PluginLoader;
 using ::android::hardware::drm::V1_0::ICryptoFactory;
 using ::android::hardware::drm::V1_0::ICryptoPlugin;
 using ::android::hardware::hidl_array;
@@ -51,7 +52,7 @@
             override;
 
 private:
-    android::PluginLoader<android::CryptoFactory> loader;
+    PluginLoader<android::CryptoFactory> loader;
 
     CryptoFactory(const CryptoFactory &) = delete;
     void operator=(const CryptoFactory &) = delete;
diff --git a/drm/1.0/default/DrmFactory.h b/drm/1.0/default/DrmFactory.h
index a008844..726bf97 100644
--- a/drm/1.0/default/DrmFactory.h
+++ b/drm/1.0/default/DrmFactory.h
@@ -19,7 +19,7 @@
 #include <android/hardware/drm/1.0/IDrmFactory.h>
 #include <hidl/Status.h>
 #include <media/drm/DrmAPI.h>
-#include <media/PluginLoader.h>
+#include <PluginLoader.h>
 #include <media/SharedLibrary.h>
 
 namespace android {
@@ -28,6 +28,7 @@
 namespace V1_0 {
 namespace implementation {
 
+using ::android::hardware::drm::V1_0::helper::PluginLoader;
 using ::android::hardware::drm::V1_0::IDrmFactory;
 using ::android::hardware::drm::V1_0::IDrmPlugin;
 using ::android::hardware::hidl_array;
@@ -53,7 +54,7 @@
             const hidl_string& appPackageName, createPlugin_cb _hidl_cb) override;
 
 private:
-    android::PluginLoader<android::DrmFactory> loader;
+    PluginLoader<android::DrmFactory> loader;
 
     DrmFactory(const DrmFactory &) = delete;
     void operator=(const DrmFactory &) = delete;
diff --git a/drm/1.0/vts/functional/shared_library.cpp b/drm/1.0/default/SharedLibrary.cpp
similarity index 82%
rename from drm/1.0/vts/functional/shared_library.cpp
rename to drm/1.0/default/SharedLibrary.cpp
index 6658150..0a942cd 100644
--- a/drm/1.0/vts/functional/shared_library.cpp
+++ b/drm/1.0/default/SharedLibrary.cpp
@@ -14,17 +14,19 @@
  * limitations under the License.
  */
 
-#define LOG_TAG "drm-vts-shared-library"
+
+#include "SharedLibrary.h"
 
 #include <dlfcn.h>
-#include <shared_library.h>
 
-using std::string;
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace helper {
 
-namespace drm_vts {
-
-SharedLibrary::SharedLibrary(const string& path) {
-    mLibHandle = dlopen(path.c_str(), RTLD_NOW);
+SharedLibrary::SharedLibrary(const String8& path) {
+    mLibHandle = dlopen(path.string(), RTLD_NOW);
 }
 
 SharedLibrary::~SharedLibrary() {
@@ -53,4 +55,9 @@
     const char* error = dlerror();
     return error ? error : "No errors or unknown error";
 }
-};
+
+}
+}
+}
+}
+} // namespace android
diff --git a/drm/1.0/default/include/PluginLoader.h b/drm/1.0/default/include/PluginLoader.h
new file mode 100644
index 0000000..f387b3c
--- /dev/null
+++ b/drm/1.0/default/include/PluginLoader.h
@@ -0,0 +1,107 @@
+/**
+ * Copyright (C) 2016 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 PLUGIN_LOADER_H_
+#define PLUGIN_LOADER_H_
+
+#include "SharedLibrary.h"
+#include <utils/Log.h>
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace helper {
+
+template <class T>
+class PluginLoader {
+
+  public:
+    PluginLoader(const char *dir, const char *entry) {
+        /**
+         * scan all plugins in the plugin directory and add them to the
+         * factories list.
+         */
+        String8 pluginDir(dir);
+
+        DIR* pDir = opendir(pluginDir.string());
+        if (pDir == NULL) {
+            ALOGE("Failed to find plugin directory %s", pluginDir.string());
+        } else {
+            struct dirent* pEntry;
+            while ((pEntry = readdir(pDir))) {
+                String8 file(pEntry->d_name);
+                if (file.getPathExtension() == ".so") {
+                    String8 path = pluginDir + "/" + pEntry->d_name;
+                    T *plugin = loadOne(path, entry);
+                    if (plugin) {
+                        factories.push(plugin);
+                    }
+                }
+            }
+            closedir(pDir);
+        }
+    }
+
+    ~PluginLoader() {
+        for (size_t i = 0; i < factories.size(); i++) {
+            delete factories[i];
+        }
+    }
+
+    T *getFactory(size_t i) const {
+        return factories[i];
+    }
+
+    size_t factoryCount() const {return factories.size();}
+
+  private:
+    T* loadOne(const char *path, const char *entry) {
+        sp<SharedLibrary> library = new SharedLibrary(String8(path));
+        if (!library.get()) {
+            ALOGE("Failed to open plugin library %s: %s", path,
+                    library->lastError());
+        } else {
+            typedef T *(*CreateFactoryFunc)();
+            CreateFactoryFunc createFactoryFunc =
+                    (CreateFactoryFunc)library->lookup(entry);
+            if (createFactoryFunc) {
+                ALOGV("Found plugin factory entry %s in %s", entry, path);
+                libraries.push(library);
+                T* result = createFactoryFunc();
+                return  result;
+           }
+        }
+        return NULL;
+    }
+
+    Vector<T *> factories;
+    Vector<sp<SharedLibrary> > libraries;
+
+    PluginLoader(const PluginLoader &) = delete;
+    void operator=(const PluginLoader &) = delete;
+};
+
+}
+}
+}
+}
+} // namespace android
+
+#endif // PLUGIN_LOADER_H_
+
diff --git a/drm/1.0/vts/functional/shared_library.h b/drm/1.0/default/include/SharedLibrary.h
similarity index 79%
rename from drm/1.0/vts/functional/shared_library.h
rename to drm/1.0/default/include/SharedLibrary.h
index 1f32243..8e174d0 100644
--- a/drm/1.0/vts/functional/shared_library.h
+++ b/drm/1.0/default/include/SharedLibrary.h
@@ -17,13 +17,18 @@
 #ifndef SHARED_LIBRARY_H_
 #define SHARED_LIBRARY_H_
 
-#include <string>
-#include <vector>
+#include <utils/RefBase.h>
+#include <utils/String8.h>
 
-namespace drm_vts {
-class SharedLibrary {
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace helper {
+
+class SharedLibrary : public RefBase {
    public:
-    explicit SharedLibrary(const std::string& path);
+    explicit SharedLibrary(const String8& path);
     ~SharedLibrary();
 
     bool operator!() const;
@@ -36,6 +41,11 @@
     SharedLibrary(const SharedLibrary&) = delete;
     void operator=(const SharedLibrary&) = delete;
 };
-};
+
+}
+}
+}
+}
+}
 
 #endif  // SHARED_LIBRARY_H_
diff --git a/drm/1.0/vts/functional/Android.bp b/drm/1.0/vts/functional/Android.bp
index 43ea372..b45ce84 100644
--- a/drm/1.0/vts/functional/Android.bp
+++ b/drm/1.0/vts/functional/Android.bp
@@ -19,7 +19,6 @@
     srcs: [
         "drm_hal_clearkey_test.cpp",
         "drm_hal_vendor_test.cpp",
-        "shared_library.cpp",
         "vendor_modules.cpp"
         ],
     shared_libs: [
@@ -39,7 +38,8 @@
         "libutils",
     ],
     static_libs: [
-        "VtsHalHidlTargetTestBase"
+        "VtsHalHidlTargetTestBase",
+        "android.hardware.drm@1.0-helper",
     ],
     cflags: [
         "-O0",
diff --git a/drm/1.0/vts/functional/vendor_modules.cpp b/drm/1.0/vts/functional/vendor_modules.cpp
index 2bf0b28..98430f5 100644
--- a/drm/1.0/vts/functional/vendor_modules.cpp
+++ b/drm/1.0/vts/functional/vendor_modules.cpp
@@ -20,13 +20,16 @@
 #include <dlfcn.h>
 #include <log/log.h>
 #include <memory>
+#include <utils/String8.h>
+#include <SharedLibrary.h>
 
-#include "shared_library.h"
 #include "vendor_modules.h"
 
 using std::string;
 using std::vector;
 using std::unique_ptr;
+using ::android::String8;
+using ::android::hardware::drm::V1_0::helper::SharedLibrary;
 
 namespace drm_vts {
 void VendorModules::scanModules(const std::string &directory) {
@@ -48,7 +51,7 @@
 
 DrmHalVTSVendorModule* VendorModules::getModule(const string& path) {
     if (mOpenLibraries.find(path) == mOpenLibraries.end()) {
-        auto library = std::make_unique<SharedLibrary>(path);
+        auto library = std::make_unique<SharedLibrary>(String8(path.c_str()));
         if (!library) {
             ALOGE("failed to map shared library %s", path.c_str());
             return NULL;
diff --git a/drm/1.0/vts/functional/vendor_modules.h b/drm/1.0/vts/functional/vendor_modules.h
index ca538f6..8330b0a 100644
--- a/drm/1.0/vts/functional/vendor_modules.h
+++ b/drm/1.0/vts/functional/vendor_modules.h
@@ -18,8 +18,12 @@
 #define VENDOR_MODULES_H
 
 #include <map>
+#include <vector>
+#include <string>
 
-#include "shared_library.h"
+#include <SharedLibrary.h>
+
+using ::android::hardware::drm::V1_0::helper::SharedLibrary;
 
 class DrmHalVTSVendorModule;
 
diff --git a/keymaster/3.0/vts/functional/keymaster_hidl_hal_test.cpp b/keymaster/3.0/vts/functional/keymaster_hidl_hal_test.cpp
index 570e33f..9854947 100644
--- a/keymaster/3.0/vts/functional/keymaster_hidl_hal_test.cpp
+++ b/keymaster/3.0/vts/functional/keymaster_hidl_hal_test.cpp
@@ -408,7 +408,7 @@
   public:
     void TearDown() override {
         if (key_blob_.size()) {
-            EXPECT_EQ(ErrorCode::OK, DeleteKey());
+            CheckedDeleteKey();
         }
         AbortIfNeeded();
     }
@@ -540,6 +540,13 @@
         return error;
     }
 
+    void CheckedDeleteKey(HidlBuf* key_blob, bool keep_key_blob = false) {
+        auto rc = DeleteKey(key_blob, keep_key_blob);
+        EXPECT_TRUE(rc == ErrorCode::OK || rc == ErrorCode::UNIMPLEMENTED);
+    }
+
+    void CheckedDeleteKey() { CheckedDeleteKey(&key_blob_); }
+
     ErrorCode GetCharacteristics(const HidlBuf& key_blob, const HidlBuf& client_id,
                                  const HidlBuf& app_data, KeyCharacteristics* key_characteristics) {
         ErrorCode error = ErrorCode::UNKNOWN_ERROR;
@@ -760,7 +767,7 @@
                             KeyFormat::RAW, key));
         string signature = MacMessage(message, digest, expected_mac.size() * 8);
         EXPECT_EQ(expected_mac, signature) << "Test vector didn't match for digest " << (int)digest;
-        DeleteKey();
+        CheckedDeleteKey();
     }
 
     void CheckAesCtrTestVector(const string& key, const string& nonce, const string& message,
@@ -1107,7 +1114,7 @@
         EXPECT_TRUE(crypto_params.Contains(TAG_KEY_SIZE, key_size));
         EXPECT_TRUE(crypto_params.Contains(TAG_RSA_PUBLIC_EXPONENT, 3));
 
-        EXPECT_EQ(ErrorCode::OK, DeleteKey(&key_blob));
+        CheckedDeleteKey(&key_blob);
     }
 }
 
@@ -1152,7 +1159,7 @@
         EXPECT_TRUE(crypto_params.Contains(TAG_ALGORITHM, Algorithm::EC));
         EXPECT_TRUE(crypto_params.Contains(TAG_KEY_SIZE, key_size));
 
-        EXPECT_EQ(ErrorCode::OK, DeleteKey(&key_blob));
+        CheckedDeleteKey(&key_blob);
     }
 }
 
@@ -1201,7 +1208,7 @@
         EXPECT_EQ(ErrorCode::OK,
                   GenerateKey(AuthorizationSetBuilder().EcdsaSigningKey(size).Digest(Digest::NONE)))
             << "Failed to generate size: " << size;
-        DeleteKey();
+        CheckedDeleteKey();
     }
 }
 
@@ -1217,7 +1224,7 @@
             ErrorCode::OK,
             GenerateKey(AuthorizationSetBuilder().EcdsaSigningKey(curve).Digest(Digest::SHA_2_512)))
             << "Failed to generate key on curve: " << curve;
-        DeleteKey();
+        CheckedDeleteKey();
     }
 }
 
@@ -1267,7 +1274,7 @@
             EXPECT_TRUE(softwareEnforced.Contains(TAG_KEY_SIZE, key_size));
         }
 
-        EXPECT_EQ(ErrorCode::OK, DeleteKey(&key_blob));
+        CheckedDeleteKey(&key_blob);
     }
 }
 
@@ -1295,7 +1302,7 @@
                                                      .HmacKey(key_size)
                                                      .Digest(Digest::SHA_2_256)
                                                      .Authorization(TAG_MIN_MAC_LENGTH, 256)));
-            DeleteKey();
+            CheckedDeleteKey();
         }
     }
 }
@@ -1327,7 +1334,7 @@
                                       .HmacKey(128)
                                       .Digest(Digest::SHA_2_256)
                                       .Authorization(TAG_MIN_MAC_LENGTH, min_mac_length)));
-            DeleteKey();
+            CheckedDeleteKey();
         }
     }
 }
@@ -1717,7 +1724,7 @@
             string message(1024, 'a');
             if (digest == Digest::NONE) message.resize(key_size / 8);
             SignMessage(message, AuthorizationSetBuilder().Digest(digest));
-            DeleteKey();
+            CheckedDeleteKey();
         }
     }
 }
@@ -1738,7 +1745,7 @@
 
         string message(1024, 'a');
         SignMessage(message, AuthorizationSetBuilder().Digest(Digest::SHA_2_256));
-        DeleteKey();
+        CheckedDeleteKey();
     }
 }
 
@@ -1799,7 +1806,7 @@
         string signature = MacMessage(message, digest, 160);
         EXPECT_EQ(160U / 8U, signature.size())
             << "Failed to sign with HMAC key with digest " << digest;
-        DeleteKey();
+        CheckedDeleteKey();
     }
 }
 
@@ -2186,7 +2193,8 @@
                 << curve << ' ' << digest;
         }
 
-        ASSERT_EQ(ErrorCode::OK, DeleteKey());
+        auto rc = DeleteKey();
+        ASSERT_TRUE(rc == ErrorCode::OK || rc == ErrorCode::UNIMPLEMENTED);
     }
 }
 
@@ -2232,8 +2240,8 @@
     VerifyMessage(verification_key, message, signature,
                   AuthorizationSetBuilder().Digest(Digest::SHA1));
 
-    EXPECT_EQ(ErrorCode::OK, DeleteKey(&signing_key));
-    EXPECT_EQ(ErrorCode::OK, DeleteKey(&verification_key));
+    CheckedDeleteKey(&signing_key);
+    CheckedDeleteKey(&verification_key);
 }
 
 typedef KeymasterHidlTest ExportKeyTest;
@@ -3481,14 +3489,14 @@
     string key = make_string(key_bytes);
     ASSERT_EQ(ErrorCode::OK, ImportKey(import_params, KeyFormat::RAW, key));
     string plaintext = DecryptMessage(ciphertext, params);
-    EXPECT_EQ(ErrorCode::OK, DeleteKey());
+    CheckedDeleteKey();
 
     // Corrupt key and attempt to decrypt
     key[0] = 0;
     ASSERT_EQ(ErrorCode::OK, ImportKey(import_params, KeyFormat::RAW, key));
     EXPECT_EQ(ErrorCode::OK, Begin(KeyPurpose::DECRYPT, params));
     EXPECT_EQ(ErrorCode::VERIFICATION_FAILED, Finish(ciphertext, &plaintext));
-    EXPECT_EQ(ErrorCode::OK, DeleteKey());
+    CheckedDeleteKey();
 }
 
 /*