(PHP ActiveX) Get Certificate CRL Distribution Points

Demonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point.

Note: This example requires Chilkat v9.5.0.76 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

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

$success = $cert->LoadFromFile('qa_data/certs/test_haswdt.cer');
if ($success != 1) {
    print $cert->LastErrorText . "\n";
    exit;
}

// Get the CRL Distribution Points extension, which is at OID 2.5.29.31
$extensionXmlStr = $cert->getExtensionAsXml('2.5.29.31');
if ($cert->LastMethodSuccess == 0) {
    print 'Certificate does not have the CDP extension.' . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml')
$xml = new COM("Chilkat.Xml");
$xml->LoadXml($extensionXmlStr);

// See what we have..
print $xml->getXml() . "\n";

// We should get XML like this:

// <?xml version="1.0" encoding="utf-8" ?>
// <sequence>
//     <sequence>
//         <contextSpecific tag="0" constructed="1">
//             <contextSpecific tag="0" constructed="1">
//                 <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
// cmVFbWFpbENBLmNybA==</contextSpecific>
//             </contextSpecific>
//         </contextSpecific>
//     </sequence>
// </sequence>
// 

// Assuming there is one CRL Distribution Point...
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbDistPoint = new COM("Chilkat.StringBuilder");
$success = $xml->GetChildContentSb('sequence|contextSpecific|contextSpecific|contextSpecific',$sbDistPoint);
if ($success == 1) {
    $sbDistPoint->Decode('base64','utf-8');
    print 'CRL Distribution Point:  ' . $sbDistPoint->getAsString() . "\n";
}

// Sample output:
// CRL Distribution Point:  http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl

?>