PHP Extension

Sign XML (XAdES) using AWS CloudHSM

See more PKCS11 Examples

Demonstrates how to sign XML using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the XML to add the signature happens locally within Chilkat.

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

PHP Extension

<?php

include("chilkat.php");

$success = false;

// 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 CkPkcs11();

// Provide the path to the AWS CloudHSM PKCS11 driver.
// This example runs on Windows, so we'll provide the CloudHSM DLL.
// If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
$pkcs11->put_SharedLibPath('C:\\Program Files\\Amazon\\CloudHSM\\lib\\cloudhsm_pkcs11.dll');

// Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
// See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
$pin = 'user:password';
$userType = 1;

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

$cert = new CkCert();
$success = $cert->LoadFromFile('qa_data/certs/myCert.cer');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// Tell the certificate to link with the PKCS11 session.
// The cert's private key should be installed on the CloudHSM.
// If there are multiple private keys on the CloudHSM, then Chilkat will automatically
// locate and use the private key corresponding to the certificate.
$success = $cert->LinkPkcs11($pkcs11);
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    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 CkXml();
$xml->put_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 CkXmlDSigGen();

// Indicate where the Signature will be inserted.
$gen->put_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->put_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->put_KeyInfoType('X509Data');
$gen->put_X509Type('Certificate');

$bUsePrivateKey = true;
$success = $gen->SetX509Cert($cert,$bUsePrivateKey);
if ($success != true) {
    print $gen->lastErrorText() . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

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

$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != true) {
    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 == false) {
    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 == false) {
    print $pkcs11->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

// --------------------------------------------------------------------------------
// Also see Chilkat's Online WSDL Code Generator
// to generate code and SOAP Request and Response XML for each operation in a WSDL.
// --------------------------------------------------------------------------------

?>