using System;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        string input = "905321234567";

        HashAlgorithm hashAlgorithm = SHA256.Create();      

        byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);

        byte[] hashBytes = hashAlgorithm.ComputeHash(inputBytes);       

        string hash = System.Convert.ToBase64String(hashBytes);

        Console.WriteLine(hash);

    }

}