using System;

using System.Security.Cryptography;

using System.Text;

​

namespace Rextester

{

    public class Program

    {

        public static void Main(string[] args)

        {

            String password = "default";

            HMACSHA256 hash = new HMACSHA256();

​

            hash.Key = Encoding.Unicode.GetBytes(password);

            string encodedPassword = Convert.ToBase64String(hash.ComputeHash(Encoding.Unicode.GetBytes(password)));

            Console.WriteLine(encodedPassword);

        } 

     } 

}