PHP

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.

Chilkat2 PHP

<?php

use Chilkat2\Asn;
use Chilkat2\BinData;
use Chilkat2\DateTime;
use Chilkat2\Xml;

// 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 BinData();
try {
    $bdCrl->LoadFile('qa_data/crl/ca1.crl');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load CRL file.\n";
    exit;
}

$asn = new Asn();
try {
    $asn->LoadBd($bdCrl);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
$xml = new Xml();
$xml->LoadXml($asn->AsnToXml());
$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
$j = 0;
$count_j = 0;
$k = 0;
$count_k = 0;

$revokedCertSerialHex = '';
$dateRevoked = '';

$dt = new DateTime();

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

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

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

            // Get the revoked certificate's serial number in uppercase hex.
            $revokedCertSerialHex = $xml->GetChildContent('sequence[i]|sequence[j]|sequence[k]|int');
            echo '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);
            echo 'date revoked: ', $dt->GetAsRfc822(false), "\n";

            $k = $k + 1;
        }

        $j = $j + 1;
    }

    $i = $i + 1;
}