using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        var input = "900116778";

        var id = GetSha256Hash(string.Format("s00000000:{0}", input));

        Console.WriteLine(input + " > " + id);

    }

    public static string GetSha256Hash(string input)

    {

      byte[] hash = new SHA256CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(input));

      StringBuilder stringBuilder = new StringBuilder();

      for (int index = 0; index < hash.Length; ++index)

        stringBuilder.Append(hash[index].ToString("x2"));

      return stringBuilder.ToString();

    }

​

}