PHP Extension

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.

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PHP Extension

<?php

include("chilkat.php");

$success = false;

$socket = new CkSocket();

//  Connect as plain TCP (no TLS yet).
$bTls = false;
$maxWaitMs = 5000;
$success = $socket->Connect('example.com',5000,$bTls,$maxWaitMs);
if ($success == false) {
    print $socket->lastErrorText() . "\n";
    exit;
}

//  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) {
    print $socket->lastErrorText() . "\n";
    exit;
}

print 'Connection upgraded to TLS.' . "\n";

?>