(PHP Extension) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

See more ScMinidriver Examples

Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

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

$scmd = new CkScMinidriver();

// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
$readerName = 'SCM Microsystems Inc. SCR33x USB Smart Card Reader 0';
$success = $scmd->AcquireContext($readerName);
if ($success == false) {
    print $scmd->lastErrorText() . "\n";
    exit;
}

// If successful, the name of the currently inserted smart card is available:
print 'Card name: ' . $scmd->cardName() . "\n";

// If desired, perform regular PIN authentication with the smartcard.
// For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
$retval = $scmd->PinAuthenticate('user','000000');
if ($retval != 0) {
    print 'PIN Authentication failed.' . "\n";
}

// You can find a cerficate using any of the following certificate parts:
// "subjectDN" -- The full distinguished name of the cert.
// "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
// "subjectCN" -- The common name part (CN) of the certificate's subject.
// "serial" -- The certificate serial number.
// "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
// These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
// See List Certificates on Smart Card Example
$certPart = 'subjectCN';
$partValue = 'BadSSL Client Certificate';

// If the certificate is found, it is loaded into the cert object.
// Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
$cert = new CkCert();
$success = $scmd->FindCert($certPart,$partValue,$cert);
if ($success == false) {
    print 'Failed to find the certificate.' . "\n";
    $scmd->DeleteContext();
    exit;
}

print 'Successfully loaded the cert object from the smart card / USB token.' . "\n";

// Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
// The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
// If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
// because the smart card ScMinidriver session will no longer be authenticated or deleted.

// ------------------------------------------------------------------------------------------------------------

// Send an HTTPS request to https://client.badssl.com
// https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
// The client certificate can be downloaded from https://badssl.com/download/.
// This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

$http = new CkHttp();

// Provide the client certificate (linked internally to our authenticated smartcard session)
$success = $http->SetSslClientCert($cert);
if ($success == false) {
    print $http->lastErrorText() . "\n";
    $scmd->DeleteContext();
    exit;
}

$responseBody = $http->quickGetStr('https://client.badssl.com/');
if ($http->get_LastMethodSuccess() == false) {
    print $http->lastErrorText() . "\n";
    $scmd->DeleteContext();
    exit;
}

print 'Response status code: ' . $http->get_LastStatus() . "\n";
print 'Response body: ' . "\n";
print $responseBody . "\n";

// ------------------------------------------------------------------------------------------------------------
// Cleanup our ScMinidriver session...

// When finished with operations that required authentication, you may if you wish, deauthenticate the session.
$success = $scmd->PinDeauthenticate('user');
if ($success == false) {
    print $scmd->lastErrorText() . "\n";
}

// Delete the context when finished with the card.
$success = $scmd->DeleteContext();
if ($success == false) {
    print $scmd->lastErrorText() . "\n";
}


?>