JavaScript

Upgrade a Plain TCP Connection to TLS

Demonstrates Socket.ConvertToSsl, which upgrades an already-connected plain TCP socket to TLS by performing a client-side TLS handshake over the existing connection.

Background. This supports STARTTLS-style upgrades, where a protocol begins in plaintext and switches to TLS at a defined point. Perform the protocol-specific negotiation first, then call ConvertToSsl.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var socket = new CkSocket();

//  Connect as plain TCP (no TLS yet).
var bTls = false;
var maxWaitMs = 5000;
success = socket.Connect("example.com",5000,bTls,maxWaitMs);
if (success == false) {
    console.log(socket.LastErrorText);
    return;
}

//  At the point where the application protocol permits a STARTTLS-style upgrade, perform any required
//  negotiation, then upgrade the existing connection to TLS with a client-side handshake.
success = socket.ConvertToSsl();
if (success == false) {
    console.log(socket.LastErrorText);
    return;
}

console.log("Connection upgraded to TLS.");