(PHP ActiveX) PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

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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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// 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.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Pkcs11')
$pkcs11 = new COM("Chilkat.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';

$success = $pkcs11->QuickSession($userType,$pin);
if ($success == 0) {
    print $pkcs11->LastErrorText . "\n";
    exit;
}

// Get the certificate (on the smart card) that has a private key.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert = new COM("Chilkat.Cert");
$success = $pkcs11->FindCert('privateKey','',$cert);
if ($success == 1) {
    print 'Cert with private key: ' . $cert->SubjectCN . "\n";
}
else {
    print 'No certificates having a private key were found.' . "\n";
    $success = $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>

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml')
$xml = new COM("Chilkat.Xml");
$xml->Tag = 'SOAP-ENV:Envelope';
$xml->AddAttribute('xmlns:SOAP-ENV','http://schemas.xmlsoap.org/soap/envelope/');
$xml->UpdateAttrAt('SOAP-ENV:Header|wsse:Security',1,'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',1,'SOAP-ENV:mustUnderstand','1');
$xml->UpdateAttrAt('SOAP-ENV:Body',1,'xmlns:SOAP-SEC','http://schemas.xmlsoap.org/soap/security/2000-12');
$xml->UpdateAttrAt('SOAP-ENV:Body',1,'SOAP-SEC:id','Body');
$xml->UpdateAttrAt('SOAP-ENV:Body|z:FooBar',1,'xmlns:z','http://example.com');

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.XmlDSigGen')
$gen = new COM("Chilkat.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 = 1;
$success = $gen->SetX509Cert($cert,$bUsePrivateKey);
if ($success != 1) {
    print $gen->LastErrorText . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

// Everything's specified.  Now create and insert the Signature
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbXml = new COM("Chilkat.StringBuilder");
$xml->EmitCompact = 1;
$xml->GetXmlSb($sbXml);

$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != 1) {
    print $gen->LastErrorText . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

// Examine the XML with the digital signature inserted
print $sbXml->getAsString() . "\n";

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

// Revert to an unauthenticated session by calling Logout.
$success = $pkcs11->Logout();
if ($success == 0) {
    print $pkcs11->LastErrorText . "\n";
    $success = $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).
$success = $pkcs11->CloseSession();
if ($success == 0) {
    print $pkcs11->LastErrorText . "\n";
    exit;
}

print 'Success.' . "\n";

?>