PHP

Get Certificate User Principal Name (UPN)

See more Certificates Examples

Demonstrates how to get a certificate's UPN from the SAN (Subject Alternative Name). Most certificates do not have a UPN. This example only applies to those certificates that have a User Principal Name.

Note: This example requires Chilkat v9.5.0.90 or greater due to fixes made in getting the UPN from the SAN.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Xml;

$cert = new Cert();

try {
    $cert->LoadFromFile('qa_data/certs/sample.cer');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$xml = new Xml();
$xml->LoadXml($cert->SubjectAlternativeName);
echo $xml->GetXml(), "\n";

// A certificate with a User Principal Name in the SAN might have this:

// <SubjectAltName>
//     <rfc822Name>joe@example.com</rfc822Name>
//     <name type="oid" oid="1.3.6.1.4.1.311.20.2.3">joe@example.com</name>
// </SubjectAltName>

// The OID 1.3.6.1.4.1.311.20.2.3 is for the User Principal Name.
try {
    $upn = $xml->ChilkatPath('/A/name,oid,1.3.6.1.4.1.311.20.2.3|*');
    echo 'User Principle Name = ', $upn, "\n";
} catch (\Chilkat2\Exception $e) {
    echo "No user principle name.\n";
}