Question

尝试解密已加密的文件时，我当前收到AEADBadTagException。我已经在stackoverflow上的很多地方进行了搜索，并且找不到解决方案，并且希望我犯了一个小错误或与编码有关，等等，因为GCM无法验证它正在生成的标签。 >

我认为问题出在我要加密/解密的文件中。相同的代码也可以在图像上使用，但是，当我尝试加密PDF时，它会失败并出现上述错误。

下面的代码没有使用CipherOutputStream / CipherInputStream，但是我都没有运气尝试过。

我知道，加密/解密方法不应该这样写，尤其是对于硬编码的IV，但是现在我只是想使其工作，然后在以后适当保护这些方法。

我正在使用Android KeyStore来获取我的秘密密钥。我知道这部分是可行的，因为我在应用程序中还有很多其他使用Keystore的方法。另外，此方法适用于图像。

该错误发生在cipher.doFinal（encryptedBytes）上。当我使用CipherInputStream时，它发生在CipherInputStream（EncryptedFileStream，cipher）

以下是代码以及错误堆栈，非常感谢您的帮助：

加密

        val fileBytes = inputStream.readBytes()
        val cipher = Cipher.getInstance("AES/GCM/NoPadding")
        keyStoreService.checkKeyAndCreate(ALIAS_FILE_KEY)
        val key = keyStoreService.getFileKey(ALIAS_FILE_KEY)
        val iv = byteArrayOf(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
        cipher.init(Cipher.ENCRYPT_MODE, key, GCMParameterSpec(128, iv))
        val encryptedBytes = cipher.doFinal(fileBytes)
        outputStream = FileOutputStream(file)
        outputStream.write(encryptedBytes)
        outputStream.flush()
        inputStream.close()
        outputStream.close()

解密

    val encryptedFile = File(filePath)
    val encryptedBytes = encryptedFile.readBytes()
    val cipher = Cipher.getInstance("AES/GCM/NoPadding")
    val key = keyStoreService.getFileKey(ALIAS_FILE_KEY)
    val iv = byteArrayOf(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
    cipher.init(Cipher.DECRYPT_MODE, key, GCMParameterSpec(128, iv))
    val decryptedBytes = cipher.doFinal(encryptedBytes)

    return ByteArrayInputStream(decryptedBytes)

Stacktrace

E/AndroidRuntime: FATAL EXCEPTION: main
Process: onboard.app.passageways, PID: 15441
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:503)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
 Caused by: javax.crypto.AEADBadTagException
    at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:517)
    at javax.crypto.Cipher.doFinal(Cipher.java:2055)
    at passageways.android.onboard.services.EncryptionService.readEncryptedFile(EncryptionService.kt:79)
    at passageways.android.onboard.fragments.MeetingBookDialogFragment.onViewCreated(Fragment.kt:38)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471)
    at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
    at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
    at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
    at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
    at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
 Caused by: android.security.KeyStoreException: Signature/MAC verification failed
    at android.security.KeyStore.getKeyStoreException(KeyStore.java:839)
    at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.doFinal(KeyStoreCryptoOperationChunkedStreamer.java:224)
    at android.security.keystore.AndroidKeyStoreAuthenticatedAESCipherSpi$BufferAllOutputUntilDoFinalStreamer.doFinal(AndroidKeyStoreAuthenticatedAESCipherSpi.java:373)
    at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:506)
    at javax.crypto.Cipher.doFinal(Cipher.java:2055) 
    at passageways.android.onboard.services.EncryptionService.readEncryptedFile(EncryptionService.kt:79) 
    at passageways.android.onboard.fragments.MeetingBookDialogFragment.onViewCreated(Fragment.kt:38) 
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471) 
    at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784) 
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852) 
    at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802) 
    at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625) 
    at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411) 
    at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366) 
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273) 
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733) 
    at android.os.Handler.handleCallback(Handler.java:873) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6669)

Answer 1

结果为readBytes（）使用默认的缓冲区大小，并且仅返回该长度的字节缓冲区。因此，实际上并没有以字节为单位返回整个文件，而只是返回缓冲区的长度。

我已切换为使用CipherOutputStream，请确保在将您的内容写入标签后，包括flush（）！

Android-javax.crypto.AEADBadTagException

1 个答案: