KeyDerivationWithConceal.java

//transforms into PBKDF2-HMAC-SHA-256.
AndroidConceal.get().nativeLibrary.ensureCryptoLoaded();

PBKDF2Hybrid encryptionKeyGenerator = new PBKDF2Hybrid();
encryptionKeyGenerator.setIterations(KEY_DERIVATION_ROUNDS);
encryptionKeyGenerator.setSalt(encryptionSalt, 0, encryptionSalt.length);
encryptionKeyGenerator.setKeyLengthInBytes(ENC_KEY_SIZE);
encryptionKeyGenerator.setPassword(passwordBytes, 0, passwordBytes.length);

encryptionKeySecret = encryptionKeyGenerator.generate();

PBKDF2Hybrid authenticationKeyGenerator = new PBKDF2Hybrid();
authenticationKeyGenerator.setIterations(KEY_DERIVATION_ROUNDS);
authenticationKeyGenerator.setSalt(authenticationSalt, 0, authenticationSalt.length);
authenticationKeyGenerator.setKeyLengthInBytes(ENC_KEY_SIZE);
authenticationKeyGenerator.setPassword(encryptionKeySecret, 0, encryptionKeySecret.length);

authenticationKeySecret = authenticationKeyGenerator.generate();

SecretKey encKey = new SecretKeySpec(encryptionKeySecret, 0, encryptionKeySecret.length, "AES");
SecretKey authKey = new SecretKeySpec(authenticationKeySecret, 0, authenticationKeySecret.length, "AES");