(PHP Extension) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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.

$cert = new CkCert();

// The LoadByCommonName method searches the Windows Local Machine and Current User 
// registry-based certificate stores for a certificate having the common name specified. 
// If found, the certificate is loaded and ready for use.
$success = $cert->LoadByCommonName('My Certificate ABC');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// The certificate must have an associated private key installed, and it must be a
// private key that has been marked "exportable" when it was originally installed.
if (!$cert->HasPrivateKey()) {
    print 'This certificate does not have a private key available.' . "\n";
    exit;
}

// privKey is a CkPrivateKey
$privKey = $cert->ExportPrivateKey();
if ($cert->get_LastMethodSuccess() == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$dkim = new CkDkim();

// Load the private key into the DKIM object:
$success = $dkim->LoadDkimPk($privKey->getPkcs8Pem(),'');
if ($success != true) {
    print $dkim->lastErrorText() . "\n";
    exit;
}

// The private key has been loaded into the DKIM object.  See the other DKIM
// examples for guidance on how to create a DKIM signature...


?>