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I'm having an error while decrypting data using the keystore on about 1% of my users (in different API versions and device models). The crash log is:

Caused by java.lang.RuntimeException: java.security.InvalidKeyException: Keystore operation failed

       at es.xxxx.yyyy.utils.KeyStoreHelperManager.decrypt(KeyStoreHelperManager.java:256)

       at es.xxxx.yyyy.activities.MainActivity.checkKeyStoreCorrecto(MainActivity.java:308)

       at es.xxxx.yyyy.activities.MainActivity.configurarLayout(MainActivity.java:294)

       at es.xxxx.yyyy.activities.MainActivity.onCreate(MainActivity.java:84)

       at android.app.Activity.performCreate(Activity.java:7144)

       at android.app.Activity.performCreate(Activity.java:7135)

       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)

       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2894)

       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049)

       at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)

       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)

       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)

       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809)

       at android.os.Handler.dispatchMessage(Handler.java:106)

       at android.os.Looper.loop(Looper.java:193)

       at android.app.ActivityThread.main(ActivityThread.java:6680)

       at java.lang.reflect.Method.invoke(Method.java)

       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)

       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)



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 es.xxxx.yyyy.utils.KeyStoreHelperManager.decrypt(KeyStoreHelperManager.java:251)

       at es.xxxx.yyyy.activities.MainActivity.checkKeyStoreCorrecto(MainActivity.java:308)

       at es.xxxx.yyyy.activities.MainActivity.configurarLayout(MainActivity.java:294)

       at es.xxxx.yyyy.activities.MainActivity.onCreate(MainActivity.java:84)

       at android.app.Activity.performCreate(Activity.java:7144)

       at android.app.Activity.performCreate(Activity.java:7135)

       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)

       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2894)

       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049)

       at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)

       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)

       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)

       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809)

       at android.os.Handler.dispatchMessage(Handler.java:106)

       at android.os.Looper.loop(Looper.java:193)

       at android.app.ActivityThread.main(ActivityThread.java:6680)

       at java.lang.reflect.Method.invoke(Method.java)

       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)

       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)



Caused by android.security.KeyStoreException: Unsupported digest

       at android.security.KeyStore.getKeyStoreException(KeyStore.java:839)

       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 es.xxxx.yyyy.utils.KeyStoreHelperManager.decrypt(KeyStoreHelperManager.java:251)

       at es.xxxx.yyyy.activities.MainActivity.checkKeyStoreCorrecto(MainActivity.java:308)

       at es.xxxx.yyyy.activities.MainActivity.configurarLayout(MainActivity.java:294)

       at es.xxxx.yyyy.activities.MainActivity.onCreate(MainActivity.java:84)

       at android.app.Activity.performCreate(Activity.java:7144)

       at android.app.Activity.performCreate(Activity.java:7135)

       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)

       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2894)

       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049)

       at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)

       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)

       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)

       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809)

       at android.os.Handler.dispatchMessage(Handler.java:106)

       at android.os.Looper.loop(Looper.java:193)

       at android.app.ActivityThread.main(ActivityThread.java:6680)

       at java.lang.reflect.Method.invoke(Method.java)

       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)

       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)



#0. Crashed: main

       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2914)

       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049)

       at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)

       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)

       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)

       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809)

       at android.os.Handler.dispatchMessage(Handler.java:106)

       at android.os.Looper.loop(Looper.java:193)

       at android.app.ActivityThread.main(ActivityThread.java:6680)

       at java.lang.reflect.Method.invoke(Method.java)

       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)

       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

This is the way we create the KeyPair:

@TargetApi(Build.VERSION_CODES.M)

static void createKeysM(String alias, boolean requireAuth) {

    try {

        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(

                KeyProperties.KEY_ALGORITHM_RSA, SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);

        keyPairGenerator.initialize(

                new KeyGenParameterSpec.Builder(

                        alias,

                        KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)

                        .setAlgorithmParameterSpec(new RSAKeyGenParameterSpec(1024, F4))

                        .setBlockModes(KeyProperties.BLOCK_MODE_CBC)

                        .setRandomizedEncryptionRequired(false)

                        .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)

                        .setDigests(KeyProperties.DIGEST_SHA256,

                                KeyProperties.DIGEST_SHA384,

                                KeyProperties.DIGEST_SHA512)

                        // Only permit the private key to be used if the user authenticated

                        // within the last five minutes.

                        .setUserAuthenticationRequired(requireAuth)

                        .build());

        KeyPair keyPair = keyPairGenerator.generateKeyPair();

        Log.d(TAG, "Public Key is: " + keyPair.getPublic().toString());



    } catch (NoSuchProviderException | NoSuchAlgorithmException | InvalidAlgorithmParameterException e) {

        throw new RuntimeException(e);

    }

}

This is the method we use to encrypt data:

 public static String encrypt(String alias, String plaintext) {

        try {



            KeyStore ks = KeyStore

                    .getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);

            ks.load(null);





            //PrivateKey privateKey = (PrivateKey) keyStore.getKey("alias", null);

            PublicKey publicKey = ks.getCertificate(alias).getPublicKey();





            //PublicKey publicKey = getPrivateKeyEntry(alias).getCertificate().getPublicKey();

            Cipher cipher = getCipher();

            cipher.init(Cipher.ENCRYPT_MODE, publicKey);

            return Base64.encodeToString(cipher.doFinal(plaintext.getBytes()), Base64.NO_WRAP);

        } catch (NullPointerException  ex){

            Logs.logException(ex);

            throw ex;

        }

        catch (Exception e) {

            Logs.logException(e);

            throw new RuntimeException(e);

        }

    }

And this is the method to decrypt data:

public static String decrypt(String alias, String ciphertext) throws IllegalBlockSizeException {

        try {



            KeyStore ks = KeyStore

                    .getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);

            ks.load(null);





            PrivateKey privateKey = (PrivateKey) ks.getKey(alias, null);





            //PrivateKey privateKey = getPrivateKeyEntry(alias).getPrivateKey();

            Cipher cipher = getCipher();

            cipher.init(Cipher.DECRYPT_MODE, privateKey);

            return new String(cipher.doFinal(Base64.decode(ciphertext, Base64.NO_WRAP)));

        }catch (IllegalBlockSizeException ex){

            throw ex;

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

The error is being launched while decrypting, just while doing cipher.init.

Our cypher is created like this:

private static Cipher getCipher() throws NoSuchPaddingException, NoSuchAlgorithmException {

    return Cipher.getInstance(

            String.format("%s/%s/%s",

                    "RSA",

                    "NoPadding",

                    "BLOCKING_MODE"));

}