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<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright 2015 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.
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At this moment, due to the different API between the image and the SDK, they can't be launched.
E.g. Skipping device 'Nexus 5 - MNC', due to different API preview 'MNC' and 'android-MNC'
-->
<sample>
<name>FingerprintDialog</name>
<group>Security</group>
<package>com.example.android.fingerprintdialog</package>
<minSdk>23</minSdk>
<strings>
<intro>
<![CDATA[
This sample demonstrates how you can use registered fingerprints to authenticate the user
before proceeding some actions such as purchasing an item.
]]>
</intro>
</strings>
<template src="base" />
<metadata>
<!-- Values: {DRAFT | PUBLISHED | INTERNAL | DEPRECATED | SUPERCEDED} -->
<status>PUBLISHED</status>
<categories>security</categories>
<technologies>Android</technologies>
<languages>Java</languages>
<solutions>Mobile</solutions>
<level>INTERMEDIATE</level>
<icon>screenshots/big-icon.png</icon>
<screenshots>
<img>screenshots/1-purchase-screen.png</img>
<img>screenshots/2-fingerprint-dialog.png</img>
<img>screenshots/3-fingerprint-authenticated.png</img>
<img>screenshots/4-new-fingerprint-enrolled.png</img>
</screenshots>
<api_refs>
<android>android.hardware.fingerprint.FingerprintManager</android>
<android>android.hardware.fingerprint.FingerprintManager.AuthenticationCallback</android>
<android>android.hardware.fingerprint.FingerprintManager.CryptoObject</android>
<android>android.security.KeyGenParameterSpec</android>
<android>java.security.KeyStore</android>
<android>javax.crypto.Cipher</android>
<android>javax.crypto.KeyGenerator</android>
</api_refs>
<description>
<![CDATA[
A sample that demonstrates to use registered fingerprints to authenticate the user in your app
]]>
</description>
<intro>
<![CDATA[
This sample demonstrates how you can use registered fingerprints in your app to authenticate the user
before proceeding some actions such as purchasing an item.
First you need to create a symmetric key in the Android Key Store using [KeyGenerator][1]
which can be only be used after the user has authenticated with fingerprint and pass
a [KeyGenParameterSpec][2].
By setting [KeyGenParameterSpec.Builder.setUserAuthenticationRequired][3] to true, you can permit the
use of the key only after the user authenticate it including when authenticated with the user's
fingerprint.
Then start listening to a fingerprint on the fingerprint sensor by calling
[FingerprintManager.authenticate][4] with a [Cipher][5] initialized with the symmetric key created.
Or alternatively you can fall back to server-side verified password as an authenticator.
Once the fingerprint (or password) is verified, the
[FingerprintManager.AuthenticationCallback#onAuthenticationSucceeded()][6] callback is called.
[1]: https://developer.android.com/reference/javax/crypto/KeyGenerator.html
[2]: https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.html
[3]: https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.Builder.html#setUserAuthenticationRequired%28boolean%29
[4]: https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.html#authenticate%28android.hardware.fingerprint.FingerprintManager.CryptoObject,%20android.os.CancellationSignal,%20int,%20android.hardware.fingerprint.FingerprintManager.AuthenticationCallback,%20android.os.Handler%29
[5]: https://developer.android.com/reference/javax/crypto/Cipher.html
[6]: https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.AuthenticationCallback.html#onAuthenticationSucceeded%28android.hardware.fingerprint.FingerprintManager.AuthenticationResult%29
]]>
</intro>
</metadata>
</sample>