docs: private String aes128WithFirst16Char(String content, String privateKey) throws GeneralSecurityException {
          byte[] crypted = null;
          SecretKeySpec skey = new SecretKeySpec(privateKey.substring(0, 16).getBytes(), "AES");
          Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
          cipher.init(Cipher.ENCRYPT_MODE, skey);
          crypted = cipher.doFinal(content.getBytes());
          return new String(Hex.encodeHex(crypted));
      }