using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        byte[] numArray;

        string base64String;

        byte[] bytes = Encoding.Unicode.GetBytes("P@ssw0rd");

        byte[] numArray2 = Convert.FromBase64String("qtCzmecYHpqANgbFgUkiqA==");

        byte[] numArray3;

        HashAlgorithm hashAlgorithm = new HMACSHA256();

        KeyedHashAlgorithm keyedHashAlgorithm = (KeyedHashAlgorithm)hashAlgorithm;

        numArray = new byte[keyedHashAlgorithm.Key.Length];

        int num = 0;

        while (true)

        {

            if (num >= numArray.Length)

            {

                break;

            }

            int num1 = Math.Min(numArray2.Length, numArray.Length - num);

            Buffer.BlockCopy(numArray2, 0, numArray, num, num1);

            Console.WriteLine(Convert.ToBase64String(numArray));

            num = num + num1;

        }

        keyedHashAlgorithm.Key = numArray;

​

        numArray3 = keyedHashAlgorithm.ComputeHash(bytes);

​

        base64String = Convert.ToBase64String(numArray3);

        Console.WriteLine(base64String);

    }

}