Code example for PBEParameterSpec

  private static Cipher getCipherFromPassphrase(String passphrase, byte[] salt, int opMode) throws GeneralSecurityException {
    SecretKey key              = getKeyFromPassphrase(passphrase, salt);
    Cipher cipher              = Cipher.getInstance(key.getAlgorithm());
    cipher.init(opMode, key, new PBEParameterSpec(salt, 100));
    return cipher;
  private static byte[] encryptWithPassphrase(Context context, byte[] data, String passphrase) throws NoSuchAlgorithmException, GeneralSecurityException {
    byte[] encryptionSalt = generateSalt();
    Cipher cipher         = getCipherFromPassphrase(passphrase, encryptionSalt, Cipher.ENCRYPT_MODE);
    byte[] cipherText     = cipher.doFinal(data);
    save(context, "encryption_salt", encryptionSalt);
    return cipherText;
  private static byte[] decryptWithPassphrase(Context context, byte[] data, String passphrase) throws GeneralSecurityException, IOException {
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