PHP Extension

Load .crl, Convert to XML, Get Revoked Serial Numbers and Dates

See more Certificates Examples

Load a binary .crl file (Certificate Revocation List), converts to XML, and then gets the revoked certificate serial numbers and revocation dates.

Note: This example requires Chilkat v9.5.0.77 or greater.

PHP Extension

<?php

include("chilkat.php");

$success = false;

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

// Load a binary .crl file.
$bdCrl = new CkBinData();
$success = $bdCrl->LoadFile('qa_data/crl/ca1.crl');
if ($success != true) {
    print 'Failed to load CRL file.' . "\n";
    exit;
}

$asn = new CkAsn();
$success = $asn->LoadBd($bdCrl);
if ($success != true) {
    print $asn->lastErrorText() . "\n";
    exit;
}

// Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
$xml = new CkXml();
$xml->LoadXml($asn->asnToXml());
$success = $xml->SaveXml('qa_output/crl.xml');

// Use this online tool to generate parsing code from CRL XML: 
// Generate Parsing Code from XML

// Here's code to parse the XML.  This code was generated by the above tool,
// and then we modified it by removing unneeded code and changing some names

$dt = new CkDateTime();

$i = 0;
$count_i = $xml->NumChildrenHavingTag('sequence');
while ($i < $count_i) {
    $xml->put_I($i);

    $j = 0;
    $count_j = $xml->NumChildrenHavingTag('sequence[i]|sequence');
    while ($j < $count_j) {
        $xml->put_J($j);

        $k = 0;
        $count_k = $xml->NumChildrenHavingTag('sequence[i]|sequence[j]|sequence');
        while ($k < $count_k) {
            $xml->put_K($k);

            // Get the revoked certificate's serial number in uppercase hex.
            $revokedCertSerialHex = $xml->getChildContent('sequence[i]|sequence[j]|sequence[k]|int');
            print 'serial number: ' . $revokedCertSerialHex . "\n";

            // Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
            $dateRevoked = $xml->getChildContent('sequence[i]|sequence[j]|sequence[k]|utctime');

            // Starting in Chilkat v9.5.0.77, date/time strings formatted as YYMMDDhhmmssZ can be parsed as follows:
            $dt->SetFromTimestamp($dateRevoked);
            print 'date revoked: ' . $dt->getAsRfc822(false) . "\n";

            $k = $k + 1;
        }

        $j = $j + 1;
    }

    $i = $i + 1;
}


?>