(PHP ActiveX) 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.

Note: This example requires Chilkat v11.0.0 or greater.

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

$success = 0;

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

$cert = new COM("Chilkat.Cert");

// 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 == 0) {
    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 = new COM("Chilkat.PrivateKey");
$success = $cert->GetPrivateKey($privKey);
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

$dkim = new COM("Chilkat.Dkim");

// Load the private key into the DKIM object:
$success = $dkim->SetDkimPrivateKey($privKey);
if ($success == 0) {
    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...

?>