using System;

using System.Security.Cryptography;

public class Program

{   

    public static void Main(){

        var pass = HashPassword("1234567");

        //Console.WriteLine(System.Text.Encoding.UTF8.GetString(h));

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

            {

              //  Console.WriteLine(pass.Hash[i]);

            }

        Console.WriteLine("----");

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

            {

                //Console.WriteLine(pass.Salt[i]);

            }

        byte[] newpass = Hash("1234567",pass.Salt);

        Console.WriteLine(SlowEquals(newpass,pass.Hash));

    }

      internal struct Password

        {

            public byte[] Hash { get; set; }

            public byte[] Salt { get; set; }

        }

     internal static byte[] Hash(string plaintext, byte[] salt)

     {

         SHA512Cng hashFunc = new SHA512Cng();

         byte[] plainBytes = System.Text.Encoding.ASCII.GetBytes(plaintext);

         byte[] toHash = new byte[plainBytes.Length + salt.Length];

         plainBytes.CopyTo(toHash, 0);

         salt.CopyTo(toHash, plainBytes.Length);

         return hashFunc.ComputeHash(toHash);

     }

    private static byte[] GenerateSalt()

    {

        RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();

        byte[] salt = new byte[256];

        rng.GetBytes(salt);

        return salt;

    }

    internal static bool SlowEquals(byte[] a, byte[] b)

    {

        int diff = a.Length ^ b.Length;

        for (int i = 0; i < a.Length && i < b.Length; i++)

        {

            diff |= a[i] ^ b[i];

            Console.WriteLine(a[i]);

            Console.WriteLine(b[i]);

            Console.WriteLine(diff);

        }

        return diff == 0;

    }

    internal static Password HashPassword(string clearPassword)

    {

        var salt = GenerateSalt();           

        return new Password { Salt = salt, Hash = Hash(clearPassword, salt) };

    }

}