(PHP Extension) Download and Trust the DigiCert Global Root CA

Demonstrates how to download a root certificate and trust it.

For more information, see https://www.digicert.com/digicert-root-certificates.htm

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

// In this example, the URLs for the DigiCert root CA certs are available at this web page:
// https://www.digicert.com/digicert-root-certificates.htm

// This example downloads the "DigiCert Global Root G3"
// Valid until: 15/Jan/2038
// Serial #: 05:55:56:BC:F2:5E:A4:35:35:C3:A4:0F:D5:AB:45:72
// Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

$certUrl = 'https://dl.cacerts.digicert.com/DigiCertGlobalRootG3.crt';

$http = new CkHttp();
$bdCert = new CkBinData();
$success = $http->DownloadBd($certUrl,$bdCert);
if ($success == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

// Load it into a Chilkat cert object.
$cert = new CkCert();
$success = $cert->LoadFromBd($bdCert);
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// Examine the common name,serial, and thumbprint:
print 'CN: ' . $cert->subjectCN() . "\n";
print 'Serial: ' . $cert->serialNumber() . "\n";
print 'Thumbprint: ' . $cert->sha1Thumbprint() . "\n";

// Output from the above:
// CN: DigiCert Global Root G3
// Serial: 055556BCF25EA43535C3A40FD5AB4572
// Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

// If desired, the certificate can be saved to a local file so it does not need
// to be downloaded from the website every time.  
$certPath = 'qa_data/certs/DigiCertGlobalRootG3.crt';
$success = $bdCert->WriteFile($certPath);

// To load the cert from a file...
$success = $cert->LoadFromFile($certPath);

// Do the following to add the cert to the collection of trusted roots
// for this application.  (Note:  The trust is not persisted.  Each time the
// application runs, it should load the cert (from whatever source, whether it is
// a file, a database,etc.) and do the following:
$troots = new CkTrustedRoots();

$troots->AddCert($cert);
$troots->Activate();

print $cert->subjectCN() . ' is now trusted for this run of this application.' . "\n";

?>