using System;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        var key = "uauiyuanaiuauhoh191890";

        var message = "Titulo|Olá Sr. Macaco, você ja comeu sua banana hoje?|809810981989018198901";

        System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();

        byte[] keyByte = encoding.GetBytes(key);

        HMACSHA256 hmacsha256 = new HMACSHA256(keyByte);

        byte[] messageBytes = encoding.GetBytes(message);

        var hash = hmacsha256.ComputeHash(messageBytes);

        Console.WriteLine(ByteToString(hash));

        Console.ReadLine();

    }

    public static string ByteToString(byte[] buff)

    {

        string sbinary = "";

​

        for (int i = 0; i < buff.Length; i++)

        {

            sbinary += buff[i].ToString("X2"); // hex format

        }

        return (sbinary);

    }

}