code: public static String decrypt(byte[] key256Bits, String encrypted) {
          SecretKey secretKey = new SecretKeySpec(key256Bits, "AES");
          return decryptBouncyCastle(secretKey, encrypted);
      }
docs: Decrypt text that was encrypted with the provided encrypt method in this class.
  
  @param key256Bits
  256 bit key
  @param encrypted
  encrypted text
  @return plain text