using System;

using System.Web;

public class Program

{

​

    public static void Main()

    {

​

        byte[] key = Convert.FromBase64String("loQj47u9A5Vj6slaKmCShd/wg2hS+Mn5mM2s5NT5GzF3um1WsbFan8y7cxDVEai8ETG5hZ+CqPDrRBJ/V0yRFA==");

        Console.WriteLine(BitConverter.ToString(key));

        byte[] data = System.Text.Encoding.UTF8.GetBytes("9644873");

        byte[] mac = null;

​

        using (System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(key))

        {

            mac = hmac.ComputeHash(data);

        }

        Console.WriteLine(BitConverter.ToString(mac));

        var test = HttpServerUtility.UrlTokenEncode(mac);

        Console.WriteLine(test);

​

    }

}