using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        var stopWatch = new System.Diagnostics.Stopwatch();

        stopWatch.Start();

        GetHashWithKey();

        stopWatch.Stop();

        Console.WriteLine(stopWatch.ElapsedMilliseconds);

    }

    public static string GetHashWithKey()

    {

        var keyBytes = new byte[256];

        var saltBytes = new byte[256];

        using (var generator = RandomNumberGenerator.Create())

        {

            generator.GetBytes(keyBytes);

            generator.GetBytes(saltBytes);

        }

​

        var key = Convert.ToBase64String(keyBytes);

        var pbkdf2 = new Rfc2898DeriveBytes(key, saltBytes, 100_000);

        var hashBytes = pbkdf2.GetBytes(256);

​

        return $"{Convert.ToBase64String(saltBytes)}|{100_000}|{Convert.ToBase64String(hashBytes)}";

    }

}