Answered: how to use TlsSocket directly?

Unlike our high-level APIs, the TlsSocket class doesn’t come with sample code, but it resembled System.Net.Sockets.Socket class and its usage is very straightforward.

Its API is documented at help.rebex.net and it can be used like this (enables TLS 1.2 only, configures mutual authentication):

// create TlsSocket instance and connect to a server
var socket = new TlsSocket();
socket.Connect("test.rebex.net", 990);

// configure TLS/SSL to negotiate TLS 1.2 only
socket.Parameters.Version = TlsVersion.TLS12;

// assign handler for client certificate authentication - use Certificate Store
socket.Parameters.CertificateRequestHandler = CertificateRequestHandler.StoreSearch;
// or use a certificate
//var cert = Certificate.LoadPfx("mycert.pfx", "password");
//socket.Parameters.CertificateRequestHandler = CertificateRequestHandler.CreateRequestHandler(cert);
// or implement your ICertificateRequestHandler
//socket.Parameters.CertificateRequestHandler = new MyCertificateRequestHandler();

// assign handler for server certificate authentication - use default verifier which uses Certificate Store
socket.Parameters.CertificateVerifier = CertificateVerifier.Default;
// or implement your ICertificateVerifier
//socket.Parameters.CertificateVerifier = new MyCertificateVerifier();

// negotiate a TLS/SSL session (start encryption)
socket.Negotiate();


// send data to the server over the secure channel
socket.Send(Encoding.ASCII.GetBytes("HELP"));

// receive data from the server over the secure channel
byte[] buffer = new byte[16 * 1024];
int n = socket.Receive(buffer, 0, buffer.Length);

Console.WriteLine(Encoding.ASCII.GetString(buffer, 0, n));