(PHP ActiveX) Socket TLS Mutual Authentication (Client-Side Certificate)

This example demonstrates how to provide a client-side certificate, also known as "two-way authentication" or "mutual authentication" for servers that require a client certificate.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Socket')
$sock = new COM("Chilkat.Socket");

// Set the certificate to be used for mutual TLS authentication
// (i.e. sets the client-side certificate for two-way TLS authentication)
$success = $sock->SetSslClientCertPfx('/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx','pfxPassword');
if ($success != 1) {
    print $sock->LastErrorText . "\n";
    exit;
}

// Note: The certificate used for the client-side of TLS mutual authentication
// must have the associated private key available. (.pfx/.p12 files typically store both
// the certificate and associated private key.)

// Establish the connection using the socket object (with client certificate authentication).
$bTls = 1;
$port = 443;
$maxWaitMs = 5000;
$success = $sock->Connect('www.example.com',$port,$bTls,$maxWaitMs);
if ($success != 1) {
    print 'Connect Failure Error Code: ' . $sock->ConnectFailReason . "\n";
    print $sock->LastErrorText . "\n";
    exit;
}

// At this point, the Socket object is connected and authenticated using the client-side cert

// ...
// ..

?>