(PHP Extension) Use Installed Cert on Windows for TLS Client Authentication

Demonstrates how to use a certificate that has already been installed on a Windows PC for TLS client authentication.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$http = new CkHttp();

//  On Windows, a pre-installed certificate can be loaded in a number of different ways.
//  This example loads by the common name:
$cert = new CkCert();
$success = $cert->LoadByCommonName('My ECA Medium Assurance Identity Certificate');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

//  Make sure this certificate has a private key available.
//  It should be a private key such that when the certificate was installed, it was marked as "exportable"
//  so that authorized programs are able to access the private key.
if ($cert->HasPrivateKey() != true) {
    print 'A private key is needed for TLS client authentication.' . "\n";
    print 'This certificate has no private key.' . "\n";
    exit;
}

//  Set the certificate to be used for mutual TLS authentication
//  (i.e. sets the client-side certificate for two-way TLS authentication)
$success = $http->SetSslClientCert($cert);
if ($success != true) {
    print $http->lastErrorText() . "\n";
    exit;
}

//  At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
//  connection will automatically use it if the server demands a client-side cert.

?>