private void main(String[] args)throws LoginException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
       String s = "ab";
        Cipher cipher = Cipher.getInstance("AES");

       KeyGenerator kgen = KeyGenerator.getInstance("AES");
      kgen.init(128);
        SecretKey key = kgen.generateKey();


        cipher.init(Cipher.ENCRYPT_MODE,key);
        byte[] bytes = cipher.doFinal(s.getBytes());
        for (byte b : bytes){
          //  time.setText(s+" "+ b);

        }
      //  String str = new String(bytes, StandardCharsets.UTF_8);
        Cipher decript = Cipher.getInstance("AES");
        decript.init(Cipher.DECRYPT_MODE,key);
        byte[] decriptedBytes = decript.doFinal(bytes);
        for (byte b : decriptedBytes){

time.setText(String.valueOf((char) b));
        }
    }