using System.Security.Cryptography;

​

static class Extentions

{

​

    public static string Sha256(this string input)

    {

​

        using (SHA256 shA256 = SHA256.Create())

        {

            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(input);

            return System.Convert.ToBase64String(((HashAlgorithm)shA256).ComputeHash(bytes));

        }

    }

}

​

​

public class Program

{

    public void Main()

{

    System.Console.WriteLine( "tester".Sha256());

}

}