Inspect TLS server certificate

InspectTLSServerCertificate.cs

using System;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
using static System.Console;

static class Program
{
    static async Task Main(string[] args)
    {
        using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        {
            await socket.ConnectAsync(IPAddress.Parse("52.3.53.115"), 443);

            using (var network = new NetworkStream(socket, FileAccess.ReadWrite, true))
            using (var ssl = new SslStream(network, false, new RemoteCertificateValidationCallback(InspectTlsCertificate), null, EncryptionPolicy.AllowNoEncryption))
            {
                await ssl.AuthenticateAsClientAsync("atom.io");

                WriteLine($"CipherAlgorithm = {ssl.CipherAlgorithm}");
                WriteLine($"HashAlgorithm = {ssl.HashAlgorithm}");
                WriteLine($"KeyExchangeAlgorithm = {ssl.KeyExchangeAlgorithm}");
                WriteLine($"SslProtocol = {ssl.SslProtocol}");

                ssl.WriteByte(0x1);

                await ssl.FlushAsync();
            }
        }
    }

    static bool InspectTlsCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        WriteLine(certificate.Subject);

        if (certificate is X509Certificate2 certificate2)
        {
            WriteLine(certificate2.FriendlyName);

            //X509Certificate2UI.DisplayCertificate(certificate2, NativeMethods.GetConsoleWindow());
        }

        return true;
    }

    static class NativeMethods
    {
        [DllImport("kernel32.dll", SetLastError = false, ExactSpelling = true)]
        internal static extern IntPtr GetConsoleWindow();
    }
}