(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

$cert = chilkat::CkCert->new();

$success = $cert->LoadFromFile("qa_data/certs/test_haswdt.cer");
if ($success != 1) {
    print $cert->lastErrorText() . "\r\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->get_LastMethodSuccess() == 0) {
    print "Certificate does not have the CDP extension." . "\r\n";
    exit;
}

$xml = chilkat::CkXml->new();
$xml->LoadXml($extensionXmlStr);

#  See what we have..
print $xml->getXml() . "\r\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...
$sbDistPoint = chilkat::CkStringBuilder->new();
$success = $xml->GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",$sbDistPoint);
if ($success == 1) {
    $sbDistPoint->Decode("base64","utf-8");
    print "CRL Distribution Point:  " . $sbDistPoint->getAsString() . "\r\n";
}

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