如何解决Android KeyStore 在 Android Instant App 中崩溃
val masterKey =
MasterKey
.Builder(applicationContext)
.setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
.build()
在 Instant App 中运行此代码会导致我的应用程序崩溃并显示以下堆栈跟踪:
2020-12-21 13:07:29.654 28949-28949/com.example.instantappandroidkeystore E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.instantappandroidkeystore,PID: 28949
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.instantappandroidkeystore/com.example.instantappandroidkeystore.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'int android.security.keystore.IKeystoreService.exist(java.lang.String,int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3448)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2147)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7814)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int android.security.keystore.IKeystoreService.exist(java.lang.String,int)' on a null object reference
at android.security.KeyStore.contains(KeyStore.java:408)
at android.security.keystore.AndroidKeyStoreSpi.engineContainsAlias(AndroidKeyStoreSpi.java:1038)
at java.security.KeyStore.containsAlias(KeyStore.java:1293)
at androidx.security.crypto.MasterKeys.keyExists(MasterKeys.java:154)
at androidx.security.crypto.MasterKeys.getOrCreate(MasterKeys.java:96)
at androidx.security.crypto.MasterKey$Builder.buildOnM(MasterKey.java:357)
at androidx.security.crypto.MasterKey$Builder.build(MasterKey.java:314)
at com.example.instantappandroidkeystore.MainActivity.onCreate(MainActivity.kt:32)
at android.app.Activity.performCreate(Activity.java:7955)
at android.app.Activity.performCreate(Activity.java:7944)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3423)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2147)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7814)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)
我没能在 StackOverflow 中找到这个问题,但我在 Google 问题跟踪器中找到了它,但没有任何回应。所以我创建了一个问题给谷歌,提供更多信息。 https://issuetracker.google.com/issues/176085956
有没有人遇到过这个问题并且能够解决它。
我的工作环境是:
- Mac 操作系统 10.15.7
- Android Studio 4.0.1
- 三星 A70
- Android 版本 10
解决方法
虽然这在 developer.android 论坛上没有正式记录,但 AndroidKeyStore 似乎限制了免安装应用的访问。我发现了这个链接 https://www.reddit.com/r/androiddev/comments/7a4tdw/why_no_hardware_backed_keystore_in_instant_apps/
keystore 受到限制并且没有 android 文档对此进行解释,这很奇怪。我不确定访问 KeyStore 的替代方案,因为我们对常规应用程序(非即时)的密钥库有很多依赖,我想不出更好的选择。期待建议!
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