using System;

                using System.IO;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

​

        GenEncoding();

    }

            static void GenEncoding()

        {

            string Key = "9lVjkBpmDGcggaXSEdwZtIhNxk6ElRGqtwHrTPYrp/Q=";

            string IV = "dkxAOd1tJXXZOUiIl9GsvA==";

            string ret = "";

            byte[] inputByteArray = Encoding.UTF8.GetBytes("{\"TIMESTAMP\":1638173168092,\"ThirdPartyID\":\"BF983477\"}");

​

            AesCryptoServiceProvider csp = new AesCryptoServiceProvider();

​

            byte[] rgbKey = Convert.FromBase64String(Key);

            byte[] rgbIV = Convert.FromBase64String(IV);

​

            using (MemoryStream ms = new MemoryStream())

            {

                var decrptor = csp.CreateDecryptor(rgbKey, rgbIV);

                using (CryptoStream cs = new CryptoStream(ms, csp.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write))

                {

                    cs.Write(inputByteArray, 0, inputByteArray.Length);

                    cs.FlushFinalBlock();

                    ret = Convert.ToBase64String(ms.ToArray());

                }

            }

            System.Console.WriteLine(ret.ToUpper());

        }

}