PHP

PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

See more PKCS11 Examples

Sample code showing how to use PKCS11 to create an XML digital signature with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Pkcs11;
use Chilkat2\StringBuilder;
use Chilkat2\Xml;
use Chilkat2\XmlDSigGen;

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

$pkcs11 = new Pkcs11();

// This example is tested on Windows using a Giesecke and Devrient Sm@rtCafe Expert 3.2 smart card.
// You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
// On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
// Otherwise provide the full path.
$pkcs11->SharedLibPath = 'aetpkss1.dll';

// Make it an authenticated session by calling Login.
$userType = 1;
// Make sure to use the correct PIN for your smart card..
$pin = '0000';

try {
    $pkcs11->QuickSession($userType, $pin);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the certificate (on the smart card) that has a private key.
$cert = new Cert();
try {
    $pkcs11->FindCert('privateKey', '', $cert);
    echo 'Cert with private key: ', $cert->SubjectCN, "\n";
} catch (\Chilkat2\Exception $e) {
    echo "No certificates having a private key were found.\n";
    $pkcs11->CloseSession();
    exit;
}

// --------------------------------------------------------------------------
// At this point, we have the cert to be used for signing.
// Our XML signing code is the same as for a cert obtained from any other source..

// First generate the following XML to be signed:
// Use this online tool to generate code from sample XML:
// Generate Code to Create XML

/*
 * <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
 * <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
 *     <SOAP-ENV:Header>
 *         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
 *     </SOAP-ENV:Header>
 *     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
 *         <z:FooBar xmlns:z="http://example.com" />
 *     </SOAP-ENV:Body>
 * </SOAP-ENV:Envelope>
 */

$xml = new Xml();
$xml->Tag = 'SOAP-ENV:Envelope';
$xml->AddAttribute('xmlns:SOAP-ENV', 'http://schemas.xmlsoap.org/soap/envelope/');
$xml->UpdateAttrAt('SOAP-ENV:Header|wsse:Security', true, 'xmlns:wsse', 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd');
$xml->UpdateAttrAt('SOAP-ENV:Header|wsse:Security', true, 'SOAP-ENV:mustUnderstand', '1');
$xml->UpdateAttrAt('SOAP-ENV:Body', true, 'xmlns:SOAP-SEC', 'http://schemas.xmlsoap.org/soap/security/2000-12');
$xml->UpdateAttrAt('SOAP-ENV:Body', true, 'SOAP-SEC:id', 'Body');
$xml->UpdateAttrAt('SOAP-ENV:Body|z:FooBar', true, 'xmlns:z', 'http://example.com');

$gen = new XmlDSigGen();

// Indicate where the Signature will be inserted.
$gen->SigLocation = 'SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security';

// Add a reference to the fragment of the XML to be signed.

// Note: "Body" refers to the XML element having an "id" equal to "Body", where "id" is case insensitive
// and where any namespace might qualify the attribute.  In this case, the SOAP-ENV:Body fragment is signed
// NOT because the tag = "Body", but because it has SOAP-SEC:id="Body"
$gen->AddSameDocRef('Body', 'sha1', 'EXCL_C14N', '', '');

// (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
$gen->SignedInfoPrefixList = 'wsse SOAP-ENV';

// Provide the private key for signing via the certificate, and indicate that
// we want the base64 of the certificate embedded in the KeyInfo.
$gen->KeyInfoType = 'X509Data';
$gen->X509Type = 'Certificate';

$bUsePrivateKey = true;
try {
    $gen->SetX509Cert($cert, $bUsePrivateKey);

    // Everything's specified.  Now create and insert the Signature
    $sbXml = new StringBuilder();
    $xml->EmitCompact = true;
    $xml->GetXmlSb($sbXml);

    $gen->CreateXmlDSigSb($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    $pkcs11->CloseSession();
    exit;
}

// Examine the XML with the digital signature inserted
echo $sbXml->GetAsString(), "\n";

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

// Revert to an unauthenticated session by calling Logout.
try {
    $pkcs11->Logout();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    $pkcs11->CloseSession();
    exit;
}

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
try {
    $pkcs11->CloseSession();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Success.\n";