cipher.init 上的 Android 密钥库操作失败

Question

在我的 Android 应用程序中，我将一个项目插入到 KeyStore 中，偶尔我会遇到与InvalidKeyException: Keystore operation failed/相关的崩溃KeyStoreException: Key not found。通常操作会成功，但总体上有大约 10% 的失败率。我认为这可能是一种竞争条件，即 cipher.init 将在密钥创建完成之前发生，但我不确定。关于为什么此代码偶尔会失败或如何解决的任何想法？

下面是错误：

    java.lang.Error: java.security.InvalidKeyException: Keystore operation failed
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1173)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: java.security.InvalidKeyException: Keystore operation failed
        at android.security.KeyStore.getInvalidKeyException(KeyStore.java:901)
        at android.security.KeyStore.getInvalidKeyException(KeyStore.java:926)
        at android.security.keystore.KeyStoreCryptoOperationUtils.getInvalidKeyExceptionForInit(KeyStoreCryptoOperationUtils.java:54)
        at android.security.keystore.KeyStoreCryptoOperationUtils.getExceptionForCipherInit(KeyStoreCryptoOperationUtils.java:89)
        at android.security.keystore.AndroidKeyStoreCipherSpiBase.ensureKeystoreOperationInitialized(AndroidKeyStoreCipherSpiBase.java:265)
        at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineInit(AndroidKeyStoreCipherSpiBase.java:109)
        at javax.crypto.Cipher.tryTransformWithProvider(Cipher.java:2984)
        at javax.crypto.Cipher.tryCombinations(Cipher.java:2891)
        at javax.crypto.Cipher$SpiAndProviderUpdater.updateAndGetSpiAndProvider(Cipher.java:2796)
        at javax.crypto.Cipher.chooseProvider(Cipher.java:773)
        at javax.crypto.Cipher.init(Cipher.java:1143)
        at javax.crypto.Cipher.init(Cipher.java:1084)
        at com.myapp.service.KeyStoreService.createKeysAndEncrypt(KeyStoreService.kt:32)
        at com.myapp.provision.ProvisionPresenter.createKeysAndEncrypt(ProvisionRepository.kt:26)
        at com.myapp.provision.ProvisionPresenter.certRetrieved(ProvisionPresenter.kt:106)
        at com.myapp.provision.ProvisionPresenter.access$certRetrieved(ProvisionPresenter.kt:17)
        at com.myapp.provision.ProvisionPresenter$postCompleted$1.invoke(ProvisionPresenter.kt:88)
        at com.myapp.provision.ProvisionPresenter$postCompleted$1.invoke(ProvisionPresenter.kt:17)
        at com.myapp.service.NetworkingService$getData$1.onResponse(NetworkingService.kt:110)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:153)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 
     Caused by: android.security.KeyStoreException: Key not found
        at android.security.KeyStore.getKeyStoreException(KeyStore.java:821)

这是我的代码：

        val keyGenerator = KeyGenerator
                .getInstance(KeyProperties.KEY_ALGORITHM_AES, context.resources.getString(R.string.key_store_instance))

        val keyGenParameterSpec = KeyGenParameterSpec.Builder(alias,
                KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT)
                .setBlockModes(KeyProperties.BLOCK_MODE_GCM)
                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
                .build()

        keyGenerator.init(keyGenParameterSpec)
        val secretKey = keyGenerator.generateKey()

        val cipher = Cipher.getInstance(context.resources.getString(R.string.key_store_transformation))

        //This is where the crash occurs
        cipher.init(Cipher.ENCRYPT_MODE, secretKey)

        val iv = cipher.iv

        val byteCert = cert.toByteArray()

        val encryption = cipher.doFinal(byteCert)