tls13-serverconfig-extension-supportedgroups.md

/*
 * Neuroxiq 2022
 * Arctium Project / Code example
 * TLS 1.3 - 
 * Example demonstrates how to configure Supported Groups
 * 
 */


using Arctium.Standards.Connection.Tls.Tls13.API;
using Arctium.Standards.Connection.Tls.Tls13.API.Extensions;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Web;

namespace ConsoleAppTest
{
    internal class MainProgram
    {
        static Socket socket;

        static void Main()
        {
            socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
            socket.Bind(new IPEndPoint(IPAddress.Loopback, 444));
            socket.Listen(20);

            StartServer();
        }

        static void StartServer()
        {
            var certificateWithPrivateKey = Tls13Resources.CERT_WITH_KEY_cert_rsaencrypt_2048_sha256_1;
            var serverContext = Tls13ServerContext.Default(new[] { certificateWithPrivateKey });

            /*  Configuration for supported groups */
            // Server will use only x25519 and x448
            // Any other group will not be accepted
            var supportedGroups = new NamedGroup[] { NamedGroup.X25519, NamedGroup.Xx448 };
            var supportedGroupsConfig = new ExtensionServerConfigSupportedGroups(supportedGroups);
            serverContext.Config.ConfigueExtensionSupportedGroups(supportedGroupsConfig);

            // After configuration - create server and accept client 

            var tlsServer = new Tls13Server(serverContext);
            var networkStream = AcceptSocketNetworkStream();
            var tlsStream = tlsServer.Accept(networkStream);

            // read from stream, do something etc. ...
            // tlsstream.read(...)
        }

        static NetworkStream AcceptSocketNetworkStream()
        {
            var rawSocket = socket.Accept();
            return new NetworkStream(rawSocket);
        }
    }
}