using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

          using (var sha = new SHA1CryptoServiceProvider())

            {             

              String hash = Convert.ToBase64String(sha.ComputeHash(Encoding.Unicode.GetBytes("abc123")));

              Console.WriteLine(hash);

​

            }

​

    }

}