code: public static byte[] decryptAsBytes(final byte[] encryptedIvTextBytes) throws Exception {
          final SecretKey secretKey = KeyManager.getInstance().getSecretKey();
          return decryptAsBytes(secretKey, encryptedIvTextBytes);
      }
docs: Decrypts the specified bytes using AES-256. This method uses the default secret key.
  @param encryptedIvTextBytes the text to decrypt
  @return the decrypted bytes
  @throws Exception a number of exceptions may be thrown
  @since 1.3.0