using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var testStr = "Hello World";

        SHA1 sha = new SHA1CryptoServiceProvider();

        byte[] data = sha.ComputeHash(Encoding.UTF8.GetBytes(testStr));

        StringBuilder sBuilder = new StringBuilder();

        for (int i = 0; i < data.Length; i++)

        {

            sBuilder.Append(data[i].ToString("x2"));

        }

​

        Console.WriteLine(sBuilder.ToString());

        Console.WriteLine(sBuilder.ToString().Length);

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

    }

}