CODEWITHSUNDEEP
javaandroidsecuritykeystore
Laki
Laki

Reputation: 41

KeyGenerator AES implementation not found in android

I am new to android development and I tried to generate the secret key for encryption and decryption and store that key inside the key store.But I got the below error while the app was being run.

java.security.NoSuchAlgorithmException: KeyGenerator AES implementation not found
 at org.apache.harmony.security.fortress.Engine.notFound(Engine.java:190)
 at org.apache.harmony.security.fortress.Engine.getInstance(Engine.java:183)
 at javax.crypto.KeyGenerator.getInstance(KeyGenerator.java:164)
 at javax.crypto.KeyGenerator.getInstance(KeyGenerator.java:135)
 at com.example.lakshika.seureapp.codes.KeyStore.createSecretKey(KeyStore.java:56)
 at com.example.lakshika.seureapp.codes.KeyStore.<init>(KeyStore.java:37)

This is the code which I have implemented.

public class KeyStore{
private static final String ANDROID_KEY_STORE = "AndroidKeyStore";
private static String DEFAULT_KEY = "";
private java.security.KeyStore keystore;
private String TAG = "Key store";

@TargetApi(Build.VERSION_CODES.M)
@RequiresApi(api = Build.VERSION_CODES.M)
public KeyStore(String alias) {
    this.DEFAULT_KEY = alias;
    Log.w(TAG,"start key store:"+ DEFAULT_KEY);
    loadKeystore();
    if (getSecretKey() == null) {
        createSecretKey();
    }
}

private void loadKeystore() {
    try {
        keystore = java.security.KeyStore.getInstance(ANDROID_KEY_STORE);
        keystore.load(null);
    } catch (IOException | NoSuchAlgorithmException |
            CertificateException | KeyStoreException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }
}

@RequiresApi(api = Build.VERSION_CODES.M)
private void createSecretKey() {
    try {
        KeyGenerator keyGenerator = KeyGenerator
                .getInstance(KeyProperties.KEY_ALGORITHM_AES,
                        ANDROID_KEY_STORE);
        KeyGenParameterSpec.Builder builder = new KeyGenParameterSpec
                .Builder(DEFAULT_KEY, KeyProperties.PURPOSE_ENCRYPT |
                KeyProperties.PURPOSE_DECRYPT)
                .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
                .setUserAuthenticationRequired(true);
        keyGenerator.init(builder.build());
        keyGenerator.generateKey();
    } catch (NoSuchAlgorithmException | NoSuchProviderException | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }
}

SecretKey getSecretKey() {
    try {
        return (SecretKey) keystore.getKey(DEFAULT_KEY, null);
    } catch (KeyStoreException | NoSuchAlgorithmException | UnrecoverableKeyException e) {
        e.printStackTrace();
    }
    return null;
}

}

If anybody knows how to solve this error, please help me.Thank you.

Upvotes: 3

Views: 4536

Answers (1)

pedrofb
pedrofb

Reputation: 39251

AES/CBC/PKCS7Padding is available since Android 23, but you are executing on Android 5 (android 21), so AES can not be used in your device

See https://developer.android.com/training/articles/keystore.html#SupportedCiphers

Upvotes: 2

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