using System;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        var secret = "";        

        var apiKey = Guid.NewGuid().ToString().Replace("-", "");

        using (var crypt = SHA256.Create())

        {

            var digest = crypt.ComputeHash(Encoding.UTF8.GetBytes(string.Format("{0}{1}", secret, apiKey)));

            var hash = string.Concat(digest.Select(b => b.ToString("x2")));

            Console.WriteLine("API Key:    " + apiKey);

            Console.WriteLine("Key Hash:   " + hash);

        }

    }

}