using System;

using System.Security.Cryptography;

using System.Text;

​

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        var username = "login";

        var password = "password";

        var hash = GetHash(username);

        hash = GetHash(hash + password);

        Console.WriteLine(hash);

    }

    public static string GetHash(string payload)

    {

        SHA1 sha1 = SHA1.Create();

        byte[] hashData = sha1.ComputeHash(Encoding.UTF8.GetBytes(payload));

        StringBuilder returnValue = new StringBuilder();

        foreach (var t in hashData)

        {

            returnValue.Append(t.ToString("x2"));

        }

        return returnValue.ToString();

    }

}