using System;

using OtpNet;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        for (int i = 0; i < 10000; i++)

        {

            var clientSecret = "USER1";

            var _secretKey = "HIHI-SECRET";

            var bytes = System.Text.Encoding.UTF8.GetBytes($"{clientSecret}-{_secretKey}-{i}");

            var totp1 = new Totp(bytes, step: 300);

            var t = DateTime.UtcNow;

            var result = totp1.ComputeTotp(t);

            Console.WriteLine($"{t} - TOTP code: {result}");

            Thread.Sleep(1000);

            var input = result;

            long timeStepMatched;

            var totp2 = new Totp(bytes, step: 300);

            bool verify = totp2.VerifyTotp(DateTime.UtcNow, input, out var window);

            Console.WriteLine("{0}-:{1}", "verify", verify);

        }

    }

}