diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 5f5f95d..20ba9a9 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -208,6 +208,14 @@
         </interface>
     </hal>
     <hal format="aidl" optional="true">
+        <name>android.hardware.confirmationui</name>
+        <version>1</version>
+        <interface>
+            <name>IConfirmationUI</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+    <hal format="aidl" optional="true">
         <name>android.hardware.contexthub</name>
         <interface>
             <name>IContextHub</name>
diff --git a/confirmationui/OWNERS b/confirmationui/OWNERS
new file mode 100644
index 0000000..2bcdb0e
--- /dev/null
+++ b/confirmationui/OWNERS
@@ -0,0 +1,2 @@
+swillden@google.com
+subrahmanyaman@google.com
diff --git a/confirmationui/aidl/Android.bp b/confirmationui/aidl/Android.bp
new file mode 100644
index 0000000..4ba4acd
--- /dev/null
+++ b/confirmationui/aidl/Android.bp
@@ -0,0 +1,38 @@
+// Copyright (C) 2022 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 {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+aidl_interface {
+    name: "android.hardware.confirmationui",
+    vendor_available: true,
+    imports: [
+        "android.hardware.security.keymint-V2",
+    ],
+    srcs: ["android/hardware/confirmationui/*.aidl"],
+    stability: "vintf",
+    backend: {
+        java: {
+            platform_apis: true,
+        },
+        ndk: {
+            apps_enabled: false,
+        },
+        cpp: {
+            enabled: false,
+        },
+    },
+}
diff --git a/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationResultCallback.aidl b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationResultCallback.aidl
new file mode 100644
index 0000000..6d6ec97
--- /dev/null
+++ b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationResultCallback.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.confirmationui;
+@VintfStability
+interface IConfirmationResultCallback {
+  void result(in int error, in byte[] formattedMessage, in byte[] confirmationToken);
+}
diff --git a/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationUI.aidl b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationUI.aidl
new file mode 100644
index 0000000..c5c7aa7
--- /dev/null
+++ b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/IConfirmationUI.aidl
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.confirmationui;
+@VintfStability
+interface IConfirmationUI {
+  void abort();
+  void deliverSecureInputEvent(in android.hardware.security.keymint.HardwareAuthToken secureInputToken);
+  void promptUserConfirmation(in android.hardware.confirmationui.IConfirmationResultCallback resultCB, in byte[] promptText, in byte[] extraData, in @utf8InCpp String locale, in android.hardware.confirmationui.UIOption[] uiOptions);
+  const int OK = 0;
+  const int CANCELED = 1;
+  const int ABORTED = 2;
+  const int OPERATION_PENDING = 3;
+  const int IGNORED = 4;
+  const int SYSTEM_ERROR = 5;
+  const int UNIMPLEMENTED = 6;
+  const int UNEXPECTED = 7;
+  const int UI_ERROR = 65536;
+  const int UI_ERROR_MISSING_GLYPH = 65537;
+  const int UI_ERROR_MESSAGE_TOO_LONG = 65538;
+  const int UI_ERROR_MALFORMED_UTF8ENCODING = 65539;
+  const int TEST_KEY_BYTE = 165;
+  const int MAX_MESSAGE_SIZE = 6144;
+}
diff --git a/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/TestModeCommands.aidl b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/TestModeCommands.aidl
new file mode 100644
index 0000000..b8629d1
--- /dev/null
+++ b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/TestModeCommands.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.confirmationui;
+@Backing(type="int") @VintfStability
+enum TestModeCommands {
+  OK_EVENT = 0,
+  CANCEL_EVENT = 1,
+}
diff --git a/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/UIOption.aidl b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/UIOption.aidl
new file mode 100644
index 0000000..ebecf9e
--- /dev/null
+++ b/confirmationui/aidl/aidl_api/android.hardware.confirmationui/current/android/hardware/confirmationui/UIOption.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.confirmationui;
+@Backing(type="int") @VintfStability
+enum UIOption {
+  ACCESSIBILITY_INVERTED = 0,
+  ACCESSIBILITY_MAGNIFIED = 1,
+}
diff --git a/confirmationui/aidl/android/hardware/confirmationui/IConfirmationResultCallback.aidl b/confirmationui/aidl/android/hardware/confirmationui/IConfirmationResultCallback.aidl
new file mode 100644
index 0000000..2165fdd
--- /dev/null
+++ b/confirmationui/aidl/android/hardware/confirmationui/IConfirmationResultCallback.aidl
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2022 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.confirmationui;
+
+import android.hardware.confirmationui.IConfirmationUI;
+
+/**
+ * Callback interface passed to IConfirmationUI::promptUserConfirmation().
+ * Informs the caller about the result of the prompt operation.
+ */
+@VintfStability
+interface IConfirmationResultCallback {
+    /**
+     * This callback is called by the confirmation provider when it stops prompting the user.
+     * Iff the user has confirmed the prompted text, error is ErrorCode::OK and the
+     * parameters formattedMessage and confirmationToken hold the values needed to request
+     * a signature from keymaster.
+     * In all other cases formattedMessage and confirmationToken must be of length 0.
+     *
+     * @param error - OK: IFF the user has confirmed the prompt.
+     *              - CANCELED: If the user has pressed the cancel button.
+     *              - ABORTED: If IConfirmationUI::abort() was called.
+     *              - SYSTEM_ERROR: If an unexpected System error occurred that prevented the TUI
+     *                             from being shut down gracefully.
+     *
+     * @param formattedMessage holds the prompt text and extra data.
+     *                         The message is CBOR (RFC 7049) encoded and has the following format:
+     *                         CBOR_MAP{ "prompt", <promptText>, "extra", <extraData> }
+     *                         The message is a CBOR encoded map (type 5) with the keys
+     *                         "prompt" and "extra". The keys are encoded as CBOR text string
+     *                         (type 3). The value <promptText> is encoded as CBOR text string
+     *                         (type 3), and the value <extraData> is encoded as CBOR byte string
+     *                         (type 2). The map must have exactly one key value pair for each of
+     *                         the keys "prompt" and "extra". Other keys are not allowed.
+     *                         The value of "prompt" is given by the proptText argument to
+     *                         IConfirmationUI::promptUserConfirmation and must not be modified
+     *                         by the implementation.
+     *                         The value of "extra" is given by the extraData argument to
+     *                         IConfirmationUI::promptUserConfirmation and must not be modified
+     *                         or interpreted by the implementation.
+     *
+     * @param confirmationToken a 32-byte HMAC-SHA256 value, computed over
+     *                          "confirmation token" || <formattedMessage>
+     *                          i.e. the literal UTF-8 encoded string "confirmation token", without
+     *                          the "", concatenated with the formatted message as returned in the
+     *                          formattedMessage argument. The HMAC is keyed with a 256-bit secret
+     *                          which is shared with Keymaster. In test mode the test key MUST be
+     *                          used (see types.hal TestModeCommands and
+     * IConfirmationUI::TEST_KEY_BYTE).
+     */
+    void result(in int error, in byte[] formattedMessage, in byte[] confirmationToken);
+}
diff --git a/confirmationui/aidl/android/hardware/confirmationui/IConfirmationUI.aidl b/confirmationui/aidl/android/hardware/confirmationui/IConfirmationUI.aidl
new file mode 100644
index 0000000..f071126
--- /dev/null
+++ b/confirmationui/aidl/android/hardware/confirmationui/IConfirmationUI.aidl
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2022 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.confirmationui;
+
+import android.hardware.confirmationui.IConfirmationResultCallback;
+import android.hardware.confirmationui.UIOption;
+import android.hardware.security.keymint.HardwareAuthToken;
+
+@VintfStability
+interface IConfirmationUI {
+    // Possible Errors.
+    /**
+     * API call succeeded or the user gave approval (result callback).
+     */
+    const int OK = 0;
+    /**
+     * The user canceled the TUI (result callback).
+     */
+    const int CANCELED = 1;
+    /**
+     * IConfirmationUI::abort() was called. (result callback).
+     */
+    const int ABORTED = 2;
+    /**
+     * Cannot start another prompt.
+     */
+    const int OPERATION_PENDING = 3;
+    /**
+     * IConfirmationUI::deliverSecureInputEvent call was ignored.
+     */
+    const int IGNORED = 4;
+    /**
+     * An unexpected system error occurred.
+     */
+    const int SYSTEM_ERROR = 5;
+    /**
+     * Returned by an unimplemented API call.
+     */
+    const int UNIMPLEMENTED = 6;
+    /**
+     * This is returned when an error is diagnosed that should have been
+     * caught by earlier input sanitization. Should never be seen in production.
+     */
+    const int UNEXPECTED = 7;
+    /**
+     * General UI error.
+     */
+    const int UI_ERROR = 0x10000;
+    /**
+     * This is returned if there is no corresponding glyph for a character.
+     */
+    const int UI_ERROR_MISSING_GLYPH = 0x10001;
+    /**
+     * The implementation must return this error code on promptUserConfirmation if the
+     * resulting formatted message does not fit into MAX_MESSAGE_SIZE bytes. It is
+     * advised that the implementation formats the message upon receiving this API call to
+     * be able to diagnose this syndrome.
+     */
+    const int UI_ERROR_MESSAGE_TOO_LONG = 0x10002;
+    /**
+     * This is returned if the UTF8 encoding is malformed.
+     */
+    const int UI_ERROR_MALFORMED_UTF8ENCODING = 0x10003;
+
+    // Constants
+    /**
+     * The test key is 32byte word with all bytes set to TEST_KEY_BYTE.
+     */
+    const int TEST_KEY_BYTE = 0xA5;
+    /**
+     * This defines the maximum message size. This indirectly limits the size of the prompt text
+     * and the extra data that can be passed to the confirmation UI. The prompt text and extra data
+     * must fit in to this size including CBOR header information.
+     */
+    const int MAX_MESSAGE_SIZE = 0x1800;
+
+    /**
+     * Aborts a pending user prompt. This allows the framework to gracefully end a TUI dialog.
+     * If a TUI operation was pending the corresponding call back is informed with
+     * ErrorCode::Aborted.
+     */
+    void abort();
+
+    /**
+     * DeliverSecureInput is used by the framework to deliver a secure input event to the
+     * confirmation provider.
+     *
+     * VTS test mode:
+     * This function can be used to test certain code paths non-interactively.
+     * See TestModeCommands.aidl for details.
+     *
+     * @param secureInputToken An authentication token as generated by Android authentication
+     *                         providers.
+     */
+    void deliverSecureInputEvent(in HardwareAuthToken secureInputToken);
+
+    /**
+     * Asynchronously initiates a confirmation UI dialog prompting the user to confirm a given text.
+     * The TUI prompt must be implemented in such a way that a positive response indicates with
+     * high confidence that a user has seen the given prompt text even if the Android framework
+     * including the kernel was compromised.
+     *
+     * Service status return:
+     *
+     * OK IFF the dialog was successfully started. In this case, and only in this
+     *                      case, the implementation must, eventually, call the callback to
+     *                      indicate completion.
+     * OPERATION_PENDING is returned when the confirmation provider is currently
+     *                      in use.
+     * SYSTEM_ERROR an error occurred trying to communicate with the confirmation
+     *                      provider (e.g. trusted app).
+     * UI_ERROR the confirmation provider encountered an issue with displaying
+     *                      the prompt text to the user.
+     *
+     * @param resultCB Implementation of IResultCallback. Used by the implementation to report
+     *                 the result of the current pending user prompt.
+     *
+     * @param promptText UTF-8 encoded bytes which is to be presented to the user.
+     *
+     * @param extraData A binary blob that must be included in the formatted output message as is.
+     *                  It is opaque to the implementation. Implementations must neither interpret
+     *                  nor modify the content.
+     *
+     * @param locale String specifying the locale that must be used by the TUI dialog. The string
+     *                      is an IETF BCP 47 tag.
+     *
+     * @param uiOptions A set of uiOptions manipulating how the confirmation prompt is displayed.
+     *                  Refer to UIOption in types.hal for possible options.
+     */
+    void promptUserConfirmation(in IConfirmationResultCallback resultCB, in byte[] promptText,
+            in byte[] extraData, in @utf8InCpp String locale, in UIOption[] uiOptions);
+}
diff --git a/confirmationui/aidl/android/hardware/confirmationui/TestModeCommands.aidl b/confirmationui/aidl/android/hardware/confirmationui/TestModeCommands.aidl
new file mode 100644
index 0000000..5b1d8fb
--- /dev/null
+++ b/confirmationui/aidl/android/hardware/confirmationui/TestModeCommands.aidl
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 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.confirmationui;
+
+/**
+ * Test mode commands.
+ *
+ * IConfirmationUI::deliverSecureInputEvent can be used to test certain code paths.
+ * To that end, the caller passes an auth token that has an HMAC keyed with the test key
+ * (see IConfirmationUI::TEST_KEY_BYTE). Implementations first check the HMAC against test key.
+ * If the test key produces a matching HMAC, the implementation evaluates the challenge field
+ * of the auth token against the values defined in TestModeCommand.
+ * If the command indicates that a confirmation token is to be generated the test key MUST be used
+ * to generate this confirmation token.
+ *
+ * See command code for individual test command descriptions.
+ */
+@VintfStability
+@Backing(type="int")
+enum TestModeCommands {
+    /**
+     * Simulates the user pressing the OK button on the UI. If no operation is pending
+     * ResponseCode::Ignored must be returned. A pending operation is finalized successfully
+     * see IConfirmationResultCallback::result, however, the test key
+     * (see IConfirmationUI::TEST_KEY_BYTE) MUST be used to generate the confirmation token.
+     */
+    OK_EVENT = 0,
+    /**
+     * Simulates the user pressing the CANCEL button on the UI. If no operation is pending
+     * Result::Ignored must be returned. A pending operation is finalized as specified in
+     * IConfirmationResultCallback.hal.
+     */
+    CANCEL_EVENT = 1,
+}
diff --git a/confirmationui/aidl/android/hardware/confirmationui/UIOption.aidl b/confirmationui/aidl/android/hardware/confirmationui/UIOption.aidl
new file mode 100644
index 0000000..b242c53
--- /dev/null
+++ b/confirmationui/aidl/android/hardware/confirmationui/UIOption.aidl
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2022 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.confirmationui;
+
+/**
+ * UI modification options.
+ */
+@VintfStability
+@Backing(type="int")
+enum UIOption {
+    /**
+     * Accessibility: Requests color inverted style.
+     */
+    ACCESSIBILITY_INVERTED = 0,
+    /**
+     * Accessibility: Requests magnified style.
+     */
+    ACCESSIBILITY_MAGNIFIED = 1,
+}
diff --git a/confirmationui/aidl/vts/functional/Android.bp b/confirmationui/aidl/vts/functional/Android.bp
new file mode 100644
index 0000000..3649c87
--- /dev/null
+++ b/confirmationui/aidl/vts/functional/Android.bp
@@ -0,0 +1,45 @@
+//
+// Copyright (C) 2022 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 {
+    // See: http://go/android-license-faq
+    default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+cc_test {
+    name: "VtsHalConfirmationUITargetTest",
+    defaults: [
+        "VtsHalTargetTestDefaults",
+        "keymint_use_latest_hal_aidl_ndk_shared",
+        "use_libaidlvintf_gtest_helper_static",
+    ],
+    srcs: [
+        "VtsHalConfirmationUITargetTest.cpp",
+    ],
+    static_libs: [
+        "android.hardware.confirmationui-V1-ndk",
+        "libcn-cbor",
+        "android.hardware.confirmationui-support-lib",
+    ],
+    shared_libs: [
+        "libbinder_ndk",
+        "libcrypto",
+    ],
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+}
diff --git a/confirmationui/aidl/vts/functional/VtsHalConfirmationUITargetTest.cpp b/confirmationui/aidl/vts/functional/VtsHalConfirmationUITargetTest.cpp
new file mode 100644
index 0000000..bf1f1c8
--- /dev/null
+++ b/confirmationui/aidl/vts/functional/VtsHalConfirmationUITargetTest.cpp
@@ -0,0 +1,535 @@
+/*
+ * Copyright (C) 2022 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 "ConfirmationIOAidlHalTest"
+
+#include <algorithm>
+#include <condition_variable>
+#include <future>
+#include <iostream>
+#include <memory>
+#include <mutex>
+
+#include <aidl/Gtest.h>
+#include <aidl/Vintf.h>
+#include <aidl/android/hardware/confirmationui/BnConfirmationResultCallback.h>
+#include <aidl/android/hardware/confirmationui/IConfirmationUI.h>
+#include <aidl/android/hardware/confirmationui/TestModeCommands.h>
+#include <aidl/android/hardware/confirmationui/UIOption.h>
+#include <android-base/thread_annotations.h>
+#include <android/hardware/confirmationui/support/confirmationui_utils.h>
+#include <cutils/log.h>
+
+#include <openssl/hmac.h>
+#include <openssl/sha.h>
+
+#include <cn-cbor/cn-cbor.h>
+
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+#include <android/binder_status.h>
+
+static constexpr int TIMEOUT_PERIOD = 10;
+
+namespace aidl::android::hardware::confirmationui::test {
+using ::aidl::android::hardware::security::keymint::HardwareAuthenticatorType;
+using ::aidl::android::hardware::security::keymint::HardwareAuthToken;
+using ::android::hardware::confirmationui::support::auth_token_key_t;
+using ::android::hardware::confirmationui::support::ByteBufferProxy;
+using ::android::hardware::confirmationui::support::HMac;
+using ::android::hardware::confirmationui::support::hmac_t;
+using ::android::hardware::confirmationui::support::hton;
+using ::android::hardware::confirmationui::support::NullOr;
+using std::shared_ptr;
+using std::string;
+using std::vector;
+
+namespace {
+const auth_token_key_t testKey(static_cast<uint8_t>(IConfirmationUI::TEST_KEY_BYTE));
+
+class HMacImplementation {
+  public:
+    static NullOr<hmac_t> hmac256(const auth_token_key_t& key,
+                                  std::initializer_list<ByteBufferProxy> buffers) {
+        HMAC_CTX hmacCtx;
+        HMAC_CTX_init(&hmacCtx);
+        if (!HMAC_Init_ex(&hmacCtx, key.data(), key.size(), EVP_sha256(), nullptr)) {
+            return {};
+        }
+        for (auto& buffer : buffers) {
+            if (!HMAC_Update(&hmacCtx, buffer.data(), buffer.size())) {
+                return {};
+            }
+        }
+        hmac_t result;
+        if (!HMAC_Final(&hmacCtx, result.data(), nullptr)) {
+            return {};
+        }
+        return result;
+    }
+};
+
+using HMacer = HMac<HMacImplementation>;
+
+template <typename... Data>
+vector<uint8_t> testHMAC(const Data&... data) {
+    auto hmac = HMacer::hmac256(testKey, data...);
+    if (!hmac.isOk()) {
+        ADD_FAILURE() << "Failed to compute test hmac.  This is a self-test error.";
+        return {};
+    }
+    vector<uint8_t> result(hmac.value().size());
+    std::copy(hmac.value().data(), hmac.value().data() + hmac.value().size(), result.data());
+    return result;
+}
+
+template <typename T>
+auto toBytes(const T& v) -> const uint8_t (&)[sizeof(T)] {
+    return *reinterpret_cast<const uint8_t(*)[sizeof(T)]>(&v);
+}
+
+HardwareAuthToken makeTestToken(const TestModeCommands command, uint64_t timestamp = 0) {
+    HardwareAuthToken auth_token;
+    auth_token.challenge = static_cast<uint64_t>(command);
+    auth_token.userId = 0;
+    auth_token.authenticatorId = 0;
+    auth_token.authenticatorType = HardwareAuthenticatorType::NONE;
+    auth_token.timestamp = {static_cast<int64_t>(timestamp)};
+
+    // Canonical form  of auth-token v0
+    // version (1 byte)
+    // challenge (8 bytes)
+    // user_id (8 bytes)
+    // authenticator_id (8 bytes)
+    // authenticator_type (4 bytes)
+    // timestamp (8 bytes)
+    // total 37 bytes
+    auth_token.mac = testHMAC("\0",
+                              toBytes(auth_token.challenge),                //
+                              toBytes(auth_token.userId),                   //
+                              toBytes(auth_token.authenticatorId),          //
+                              toBytes(hton(auth_token.authenticatorType)),  //
+                              toBytes(hton(auth_token.timestamp)));         //
+
+    return auth_token;
+}
+
+#define DEBUG_CONFRIMATIONUI_UTILS_TEST
+
+#ifdef DEBUG_CONFRIMATIONUI_UTILS_TEST
+std::ostream& hexdump(std::ostream& out, const uint8_t* data, size_t size) {
+    for (size_t i = 0; i < size; ++i) {
+        uint8_t byte = data[i];
+        out << std::hex << std::setw(2) << std::setfill('0') << (unsigned)byte;
+        switch (i & 0xf) {
+            case 0xf:
+                out << "\n";
+                break;
+            case 7:
+                out << "  ";
+                break;
+            default:
+                out << " ";
+                break;
+        }
+    }
+    return out;
+}
+#endif
+
+constexpr char hex_value[256] = {0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 1,  2,  3,  4,  5,  6,  7, 8, 9, 0, 0, 0, 0, 0, 0,  // '0'..'9'
+                                 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 'A'..'F'
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 'a'..'f'
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  //
+                                 0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+std::string hex2str(std::string a) {
+    std::string b;
+    size_t num = a.size() / 2;
+    b.resize(num);
+    for (size_t i = 0; i < num; i++) {
+        b[i] = (hex_value[a[i * 2] & 0xFF] << 4) + (hex_value[a[i * 2 + 1] & 0xFF]);
+    }
+    return b;
+}
+
+int getReturnCode(const ::ndk::ScopedAStatus& result) {
+    if (result.isOk()) return IConfirmationUI::OK;
+
+    if (result.getExceptionCode() == EX_SERVICE_SPECIFIC) {
+        return static_cast<int>(result.getServiceSpecificError());
+    }
+    return result.getStatus();
+}
+
+}  // namespace
+
+class ConfirmationUIAidlTest : public ::testing::TestWithParam<std::string> {
+  public:
+    void TearDown() override { confirmator_->abort(); }
+    void SetUp() override {
+        std::string name = GetParam();
+        ASSERT_TRUE(AServiceManager_isDeclared(name.c_str())) << name;
+        ndk::SpAIBinder binder(AServiceManager_waitForService(name.c_str()));
+        ASSERT_NE(binder, nullptr);
+        confirmator_ = IConfirmationUI::fromBinder(binder);
+        ASSERT_NE(confirmator_, nullptr);
+    }
+
+    // Used as a mechanism to inform the test about data/event callback
+    inline void notify() {
+        std::unique_lock<std::mutex> lock(mtx_);
+        cv_.notify_one();
+    }
+
+    // Test code calls this function to wait for data/event callback
+    inline std::cv_status wait() {
+        std::unique_lock<std::mutex> lock(mtx_);
+        auto now = std::chrono::system_clock::now();
+        std::cv_status status = cv_.wait_until(lock, now + std::chrono::seconds(TIMEOUT_PERIOD));
+        return status;
+    }
+
+  protected:
+    shared_ptr<IConfirmationUI> confirmator_;
+
+  private:
+    // synchronization objects
+    std::mutex mtx_;
+    std::condition_variable cv_;
+};
+
+class ConfirmationTestCallback
+    : public ::aidl::android::hardware::confirmationui::BnConfirmationResultCallback {
+  public:
+    ConfirmationTestCallback(ConfirmationUIAidlTest& parent) : parent_(parent){};
+    virtual ~ConfirmationTestCallback() = default;
+
+    ::ndk::ScopedAStatus result(int32_t err, const vector<uint8_t>& msg,
+                                const vector<uint8_t>& confToken) override {
+        error_ = err;
+        formattedMessage_ = msg;
+        confirmationToken_ = confToken;
+        parent_.notify();
+        return ndk::ScopedAStatus::ok();
+    }
+
+    bool verifyConfirmationToken() {
+        static constexpr char confirmationPrefix[] = "confirmation token";
+        EXPECT_EQ(32U, confirmationToken_.size());
+        return 32U == confirmationToken_.size() &&
+               !memcmp(confirmationToken_.data(),
+                       testHMAC(confirmationPrefix, formattedMessage_).data(), 32);
+    }
+
+    int error_;
+    vector<uint8_t> formattedMessage_;
+    vector<uint8_t> confirmationToken_;
+
+  private:
+    ConfirmationUIAidlTest& parent_;
+};
+
+struct CnCborDeleter {
+    void operator()(cn_cbor* ptr) { cn_cbor_free(ptr); }
+};
+
+typedef std::unique_ptr<cn_cbor, CnCborDeleter> CnCborPtr;
+
+// Simulates the User taping Ok
+TEST_P(ConfirmationUIAidlTest, UserOkTest) {
+    static constexpr char test_prompt[] = "Me first, gimme gimme!";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {}).isOk());
+    // Simulate the user taping ok.
+    ASSERT_TRUE(confirmator_->deliverSecureInputEvent(makeTestToken(TestModeCommands::OK_EVENT))
+                        .isOk());
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::OK, conf_cb->error_);
+
+    ASSERT_TRUE(conf_cb->verifyConfirmationToken());
+
+    cn_cbor_errback cn_cbor_error;
+    auto parsed_message = CnCborPtr(cn_cbor_decode(
+            conf_cb->formattedMessage_.data(), conf_cb->formattedMessage_.size(), &cn_cbor_error));
+    // is parsable CBOR
+    ASSERT_TRUE(parsed_message.get());
+    // is a map
+    ASSERT_EQ(CN_CBOR_MAP, parsed_message->type);
+
+    // the message must have exactly 2 key value pairs.
+    // cn_cbor holds 2*<no_of_pairs> in the length field
+    ASSERT_EQ(4, parsed_message->length);
+    // map has key "prompt"
+    auto prompt = cn_cbor_mapget_string(parsed_message.get(), "prompt");
+    ASSERT_TRUE(prompt);
+    ASSERT_EQ(CN_CBOR_TEXT, prompt->type);
+    ASSERT_EQ(22, prompt->length);
+    ASSERT_EQ(0, memcmp(test_prompt, prompt->v.str, 22));
+    // map has key "extra"
+    auto extra_out = cn_cbor_mapget_string(parsed_message.get(), "extra");
+    ASSERT_TRUE(extra_out);
+    ASSERT_EQ(CN_CBOR_BYTES, extra_out->type);
+    ASSERT_EQ(3, extra_out->length);
+    ASSERT_EQ(0, memcmp(test_extra, extra_out->v.bytes, 3));
+}
+
+// Initiates a confirmation prompt with a message that is too long
+TEST_P(ConfirmationUIAidlTest, MessageTooLongTest) {
+    static constexpr uint8_t test_extra[IConfirmationUI::MAX_MESSAGE_SIZE] = {};
+    static constexpr char test_prompt[] = "D\'oh!";
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + sizeof(test_extra));
+    auto result = confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {});
+    ASSERT_EQ(IConfirmationUI::UI_ERROR_MESSAGE_TOO_LONG, getReturnCode(result));
+}
+
+// If the message gets very long some HAL implementations might fail even before the message
+// reaches the trusted app implementation. But the HAL must still diagnose the correct error.
+TEST_P(ConfirmationUIAidlTest, MessageWayTooLongTest) {
+    static constexpr uint8_t test_extra[(IConfirmationUI::MAX_MESSAGE_SIZE)*10] = {};
+    static constexpr char test_prompt[] = "D\'oh!";
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + sizeof(test_extra));
+    auto result = confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {});
+    ASSERT_EQ(IConfirmationUI::UI_ERROR_MESSAGE_TOO_LONG, getReturnCode(result));
+}
+
+// Simulates the User tapping the Cancel
+TEST_P(ConfirmationUIAidlTest, UserCancelTest) {
+    static constexpr char test_prompt[] = "Me first, gimme gimme!";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {}).isOk());
+
+    // Simulate the user taping ok.
+    ASSERT_TRUE(confirmator_->deliverSecureInputEvent(makeTestToken(TestModeCommands::CANCEL_EVENT))
+                        .isOk());
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::CANCELED, conf_cb->error_);
+
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Simulates the framework cancelling an ongoing prompt
+TEST_P(ConfirmationUIAidlTest, AbortTest) {
+    static constexpr char test_prompt[] = "Me first, gimme gimme!";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {}).isOk());
+
+    confirmator_->abort();
+
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::ABORTED, conf_cb->error_);
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Tests if the confirmation dialog can successfully render 100 'W' characters as required by
+// the design guidelines.
+TEST_P(ConfirmationUIAidlTest, PortableMessageTest1) {
+    static constexpr char test_prompt[] =
+            "WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW"
+            "WWWWWWWWWWWWWW";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {}).isOk());
+
+    confirmator_->abort();
+
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::ABORTED, conf_cb->error_);
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Tests if the confirmation dialog can successfully render 100 'W' characters as required by
+// the design guidelines in magnified mode.
+TEST_P(ConfirmationUIAidlTest, PortableMessageTest1Magnified) {
+    static constexpr char test_prompt[] =
+            "WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW"
+            "WWWWWWWWWWWWWW";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_
+                        ->promptUserConfirmation(conf_cb, prompt_text, extra, "en",
+                                                 {UIOption::ACCESSIBILITY_MAGNIFIED})
+                        .isOk());
+
+    confirmator_->abort();
+
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::ABORTED, conf_cb->error_);
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Tests if the confirmation dialog can successfully render 8 groups of 12 'W' characters as
+// required by the design guidelines.
+TEST_P(ConfirmationUIAidlTest, PortableMessageTest2) {
+    static constexpr char test_prompt[] =
+            "WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW "
+            "WWWWWWWWWWWW WWWWWWWWWWWW";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {}).isOk());
+
+    confirmator_->abort();
+
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::ABORTED, conf_cb->error_);
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Tests if the confirmation dialog can successfully render 8 groups of 12 'W' characters as
+// required by the design guidelines in magnified mode.
+TEST_P(ConfirmationUIAidlTest, PortableMessageTest2Magnified) {
+    static constexpr char test_prompt[] =
+            "WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW WWWWWWWWWWWW "
+            "WWWWWWWWWWWW WWWWWWWWWWWW";
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    ASSERT_TRUE(confirmator_
+                        ->promptUserConfirmation(conf_cb, prompt_text, extra, "en",
+                                                 {UIOption::ACCESSIBILITY_MAGNIFIED})
+                        .isOk());
+
+    confirmator_->abort();
+
+    // Wait for the callback.
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+    ASSERT_EQ(IConfirmationUI::ABORTED, conf_cb->error_);
+    ASSERT_EQ(0U, conf_cb->confirmationToken_.size());
+    ASSERT_EQ(0U, conf_cb->formattedMessage_.size());
+}
+
+// Passing malformed UTF-8 to the confirmation UI
+// This test passes a string that ends in the middle of a multibyte character
+TEST_P(ConfirmationUIAidlTest, MalformedUTF8Test1) {
+    static constexpr char test_prompt[] = {char(0xc0), 0};
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    auto result = confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {});
+    ASSERT_EQ(IConfirmationUI::UI_ERROR_MALFORMED_UTF8ENCODING, getReturnCode(result));
+}
+
+// Passing malformed UTF-8 to the confirmation UI
+// This test passes a string with a 5-byte character.
+TEST_P(ConfirmationUIAidlTest, MalformedUTF8Test2) {
+    static constexpr char test_prompt[] = {char(0xf8), char(0x82), char(0x82),
+                                           char(0x82), char(0x82), 0};
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    auto result = confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {});
+    ASSERT_EQ(IConfirmationUI::UI_ERROR_MALFORMED_UTF8ENCODING, getReturnCode(result));
+}
+
+// Passing malformed UTF-8 to the confirmation UI
+// This test passes a string with a 2-byte character followed by a stray non UTF-8 character.
+TEST_P(ConfirmationUIAidlTest, MalformedUTF8Test3) {
+    static constexpr char test_prompt[] = {char(0xc0), char(0x82), char(0x83), 0};
+    static constexpr uint8_t test_extra[] = {0x1, 0x2, 0x3};
+    shared_ptr<ConfirmationTestCallback> conf_cb =
+            ::ndk::SharedRefBase::make<ConfirmationTestCallback>(*this);
+    vector<uint8_t> prompt_text(test_prompt, test_prompt + sizeof(test_prompt));
+    vector<uint8_t> extra(test_extra, test_extra + 3);
+    auto result = confirmator_->promptUserConfirmation(conf_cb, prompt_text, extra, "en", {});
+    ASSERT_EQ(IConfirmationUI::UI_ERROR_MALFORMED_UTF8ENCODING, getReturnCode(result));
+}
+
+// Test the implementation of HMAC SHA 256 against a golden blob.
+TEST(ConfirmationUITestSelfTest, HMAC256SelfTest) {
+    const char key_str[32] = "keykeykeykeykeykeykeykeykeykeyk";
+    const uint8_t(&key)[32] = *reinterpret_cast<const uint8_t(*)[32]>(key_str);
+    auto expected = hex2str("2377fbcaa7fb3f6c20cfa1d9ebc60e9922cf58c909e25e300f3cb57f7805c886");
+    auto result = HMacer::hmac256(key, "value1", "value2", "value3");
+
+#ifdef DEBUG_CONFRIMATIONUI_UTILS_TEST
+    hexdump(std::cout, reinterpret_cast<const uint8_t*>(expected.data()), 32) << std::endl;
+    hexdump(std::cout, result.value().data(), 32) << std::endl;
+#endif
+
+    ByteBufferProxy expected_bytes(expected);
+    ASSERT_TRUE(result.isOk());
+    ASSERT_EQ(expected, result.value());
+}
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(ConfirmationUIAidlTest);
+INSTANTIATE_TEST_SUITE_P(
+        PerInstance, ConfirmationUIAidlTest,
+        testing::ValuesIn(::android::getAidlHalInstanceNames(IConfirmationUI::descriptor)),
+        ::android::PrintInstanceNameToString);
+
+}  // namespace aidl::android::hardware::confirmationui::test
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    ABinderProcess_setThreadPoolMaxThreadCount(1);
+    ABinderProcess_startThreadPool();
+    return RUN_ALL_TESTS();
+}