using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        string Key = "zOkCnPH4ys";

        string Code = "M29751";

        string PaymentID = "1";

        string RefNo = "H5Z6MAY7AHEA2Z0870A5Q8KAB";

        string Amount = "100";

        string Currency = "MYR";

        string Status = "1";

        string RequestToHash = Key + Code + RefNo + Amount + Currency;

        string ResponseToHash = Key + Code + PaymentID + RefNo + Amount + Currency + Status;

        Console.WriteLine(GenerateSHA256(RequestToHash));

        Console.WriteLine(GenerateSHA256(ResponseToHash));

        Console.WriteLine(Environment.NewLine);

        Console.WriteLine("==================================================================================================================================================================================");

        Console.WriteLine(Environment.NewLine);

        Console.WriteLine(GenerateHMACSHA512(RequestToHash, Key));

        Console.WriteLine(GenerateHMACSHA512(ResponseToHash, Key));

    }

    public static string GenerateSHA256(string Input)

    {

        using (var SHA256Crypto = SHA256.Create())

        {

            byte[] InputBytes = Encoding.UTF8.GetBytes(Input);

            byte[] InputHash = SHA256Crypto.ComputeHash(InputBytes);

​

            return GetStringFromHash(InputHash);

        }

    }

    public static string GenerateHMACSHA512(string Input, string Key)

    {

        using (var HMACSHA512Crypto = new HMACSHA512(Encoding.UTF8.GetBytes(Key)))

        {

            byte[] InputBytes = Encoding.UTF8.GetBytes(Input);

            byte[] InputHash = HMACSHA512Crypto.ComputeHash(InputBytes);

​

            return GetStringFromHash(InputHash);

        }

    }

​

    private static string GetStringFromHash(byte[] Input)

    {

        var Builder = new StringBuilder();

​

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

            Builder.Append(Input[i].ToString("X2"));

​

        return Builder.ToString().ToLower();

    }

}