using System;

using System.Web;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        var text = "HashKey=m77FPILf84NGRBYY&AllPayLogisticsID=28705941&BookingNote=&CVSPaymentNo=&CVSValidationNo=&GoodsAmount=782&LogisticsSubType=UNIMART&LogisticsType=CVS&MerchantID=2000132&MerchantTradeNo=N202302259563&ReceiverAddress=&ReceiverCellPhone=0960511765&ReceiverEmail=a0960511765@gmail.com&ReceiverName=龔真誼&ReceiverPhone=886-960511765&RtnCode=2074&RtnMsg=消費者七天未取件&UpdateStatusDate=2023/02/27 05:45:37&HashIV=aX3yiDbdC97rxp2E";

        //UrlEncode

        var encodedString = HttpUtility.UrlEncode(text).ToLower();

        byte[] hashedByteArray;

        using (var md5 = MD5.Create())

        {

            // 做md5後得到byte array

            hashedByteArray = md5.ComputeHash(Encoding.UTF8.GetBytes(encodedString));

        }

        var stringBuilder = new StringBuilder();

        foreach (var @byte in hashedByteArray)

        {

            stringBuilder.Append(@byte.ToString("X2"));

        }

        var hexString = stringBuilder.ToString();

        Console.WriteLine(hexString.ToUpper());

    }

}