(PHP Extension) Create XAdES using Smart Card or USB Token

Demonstrates how to create an XAdES signed XML document using a certificate located on a smartcard or USB token.

Note: This example requires Chilkat v9.5.0.75 or greater. Also, at the time of this writing this example is restricted to the Windows operating system.

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");

// ----------------------------------------------------------------------
// IMPORTANT: This generated example requires Chilkat v9.5.0.75 or later.
// Contact support@chilkatsoft.com for a pre-release.
// ----------------------------------------------------------------------

// Load the XML to be signed.
$xmlToSign = new CkXml();
$success = $xmlToSign->LoadXmlFile('qa_data/fattura_electronica/docToSign.xml');
if ($success != true) {
    print $xmlToSign->lastErrorText() . "\n";
    exit;
}

$gen = new CkXmlDSigGen();

$gen->put_SigLocation('p:FatturaElettronica');
$gen->put_SigId('xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504');
$gen->put_SigNamespacePrefix('ds');
$gen->put_SigNamespaceUri('http://www.w3.org/2000/09/xmldsig#');
$gen->put_SigValueId('xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue');
$gen->put_SignedInfoCanonAlg('C14N');
$gen->put_SignedInfoDigestMethod('sha256');

// Create an Object to be added to the Signature.
// Note: Chilkat will automatically populate the strings indicated by "TO BE GENERATED BY CHILKAT" with actual/correct values
// when the XML is signed.
$object1 = new CkXml();
$object1->put_Tag('xades:QualifyingProperties');
$object1->AddAttribute('xmlns:xades','http://uri.etsi.org/01903/v1.3.2#');
$object1->AddAttribute('xmlns:xades141','http://uri.etsi.org/01903/v1.4.1#');
$object1->AddAttribute('Target','#xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504');
$object1->UpdateAttrAt('xades:SignedProperties',true,'Id','xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime','TO BE GENERATED BY CHILKAT');
$object1->UpdateAttrAt('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod',true,'Algorithm','http://www.w3.org/2001/04/xmlenc#sha256');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue','TO BE GENERATED BY CHILKAT');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName','TO BE GENERATED BY CHILKAT');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber','TO BE GENERATED BY CHILKAT');

$gen->AddObject('',$object1->getXml(),'','');

// -------- Reference 1 --------
$gen->put_KeyInfoId('xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo');
$gen->AddSameDocRef('xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo','sha256','','','');

// -------- Reference 2 --------
$gen->AddSameDocRef('','sha256','','','');
$gen->SetRefIdAttr('','xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-ref0');

// -------- Reference 3 --------
$gen->AddObjectRef('xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops','sha256','','','http://uri.etsi.org/01903#SignedProperties');

// ----------------------------------------------------------------
//  Load a certificate that has been pre-installed on the Windows system
//  This includes certificates on smartcards and USB tokens
$cert = new CkCert();

//  You may provide the PIN here..
$cert->put_SmartCardPin('000000');

// Load the certificate on the smartcard currently in the reader (or on the USB token).
// Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
// See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
$success = $cert->LoadFromSmartcard('');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$gen->SetX509Cert($cert,true);
$gen->put_KeyInfoType('X509Data');
$gen->put_X509Type('Certificate');

// Load XML to be signed...
$sbXml = new CkStringBuilder();
$xmlToSign->GetXmlSb($sbXml);

$gen->put_Behaviors('IndentedSignature,ForceAddEnvelopedSignatureTransform');

// Sign the XML...
$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != true) {
    print $gen->lastErrorText() . "\n";
    exit;
}

// Save the signed XMl to a file.
$success = $sbXml->WriteFile('qa_output/signedXml.xml','utf-8',false);

print $sbXml->getAsString() . "\n";

// ----------------------------------------
// Verify the signature we just produced...
$verifier = new CkXmlDSig();
$success = $verifier->LoadSignatureSb($sbXml);
if ($success != true) {
    print $verifier->lastErrorText() . "\n";
    exit;
}

$verified = $verifier->VerifySignature(true);
if ($verified != true) {
    print $verifier->lastErrorText() . "\n";
    exit;
}

print 'This signature was successfully verified.' . "\n";

?>