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PHP Extension

XML-DSig Add Reference with Transforms Specified Explicitly

Demonstrates how to use the new AddSameDocRef2 method to explicitly specify the XML Transforms fragment.

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<?php

include("chilkat.php");

$success = false;

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

$success = true;

// Create the following XML to be signed:

// <doc>
//     <s id="s1">Some text...</s>
//     <p>Some text...</p>
//     <p class="note">A note...</p>
// </doc>

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

$xmlToSign = new CkXml();
$xmlToSign->put_Tag('doc');
$xmlToSign->UpdateAttrAt('s',true,'id','s1');
$xmlToSign->UpdateChildContent('s','Some text...');
$xmlToSign->UpdateChildContent('p','Some text...');
$xmlToSign->UpdateAttrAt('p[1]',true,'class','note');
$xmlToSign->UpdateChildContent('p[1]','A note...');

print $xmlToSign->getXml() . "\n";

$gen = new CkXmlDSigGen();

$gen->put_SigLocation('doc');
$gen->put_SigLocationMod(0);
$gen->put_SigId('Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature');
$gen->put_SigNamespacePrefix('ds');
$gen->put_SigNamespaceUri('http://www.w3.org/2000/09/xmldsig#');
$gen->put_SigValueId('Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue');
$gen->put_SignedInfoCanonAlg('C14N');
$gen->put_SignedInfoDigestMethod('sha1');

// Set the KeyInfoId before adding references..
$gen->put_KeyInfoId('Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo');

// The following XML to be added as an Object to the Signature

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// <xades:QualifyingProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties" Target="#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xades="http://uri.etsi.org/01903/v1.3.2#">
//     <xades:SignedProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties">
//         <xades:SignedSignatureProperties>
//             <xades:SigningTime>TO BE GENERATED BY CHILKAT</xades:SigningTime>
//             <xades:SigningCertificate>
//                 <xades:Cert>
//                     <xades:CertDigest>
//                         <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
//                         <ds:DigestValue>TO BE GENERATED BY CHILKAT</ds:DigestValue>
//                     </xades:CertDigest>
//                     <xades:IssuerSerial>
//                         <ds:X509IssuerName>TO BE GENERATED BY CHILKAT</ds:X509IssuerName>
//                         <ds:X509SerialNumber>TO BE GENERATED BY CHILKAT</ds:X509SerialNumber>
//                     </xades:IssuerSerial>
//                 </xades:Cert>
//             </xades:SigningCertificate>
//         </xades:SignedSignatureProperties>
//         <xades:SignedDataObjectProperties>
//             <xades:DataObjectFormat ObjectReference="#Reference-24eb6003-d41c-442c-a731-d4c58f94790b">
//                 <xades:Description/>
//                 <xades:ObjectIdentifier>
//                     <xades:Identifier Qualifier="OIDAsURN">urn:oid:1.2.840.10003.5.109.10</xades:Identifier>
//                     <xades:Description/>
//                 </xades:ObjectIdentifier>
//                 <xades:MimeType>text/xml</xades:MimeType>
//                 <xades:Encoding/>
//             </xades:DataObjectFormat>
//         </xades:SignedDataObjectProperties>
//     </xades:SignedProperties>
// </xades:QualifyingProperties>

$object1 = new CkXml();
$object1->put_Tag('xades:QualifyingProperties');
$object1->AddAttribute('Id','Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties');
$object1->AddAttribute('Target','#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature');
$object1->AddAttribute('xmlns:ds','http://www.w3.org/2000/09/xmldsig#');
$object1->AddAttribute('xmlns:xades','http://uri.etsi.org/01903/v1.3.2#');
$object1->UpdateAttrAt('xades:SignedProperties',true,'Id','Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime','TO BE GENERATED BY CHILKAT');
// Note: It may be that http://www.w3.org/2001/04/xmlenc#sha256 is needed in the following line instead of http://www.w3.org/2000/09/xmldsig#sha1
$object1->UpdateAttrAt('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod',true,'Algorithm','http://www.w3.org/2000/09/xmldsig#sha1');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue','TO BE GENERATED BY CHILKAT');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2','TO BE GENERATED BY CHILKAT');
$object1->UpdateAttrAt('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat',true,'ObjectReference','#Reference-24eb6003-d41c-442c-a731-d4c58f94790b');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description','');
$object1->UpdateAttrAt('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier',true,'Qualifier','OIDAsURN');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier','urn:oid:1.2.840.10003.5.109.10');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description','');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType','text/xml');
$object1->UpdateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Encoding','');

print $object1->getXml() . "\n";

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

// -------- Reference 1 --------

// Create the following Transforms fragment:

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// <ds:Transforms>
//     <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
//     <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
//     <ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
//         <ds:XPath xmlns:ds="http://www.w3.org/2000/09/xmldsig#">not(ancestor-or-self::ds:Signature)</ds:XPath>
//     </ds:Transform>
// </ds:Transforms>

$xml1 = new CkXml();
$xml1->put_Tag('ds:Transforms');
$xml1->UpdateAttrAt('ds:Transform',true,'Algorithm','http://www.w3.org/TR/2001/REC-xml-c14n-20010315');
$xml1->UpdateAttrAt('ds:Transform[1]',true,'Algorithm','http://www.w3.org/2000/09/xmldsig#enveloped-signature');
$xml1->UpdateAttrAt('ds:Transform[2]',true,'Algorithm','http://www.w3.org/TR/1999/REC-xpath-19991116');
$xml1->UpdateAttrAt('ds:Transform[2]|ds:XPath',true,'xmlns:ds','http://www.w3.org/2000/09/xmldsig#');
$xml1->UpdateChildContent('ds:Transform[2]|ds:XPath','not(ancestor-or-self::ds:Signature)');

// This is the "Transforms" XML fragment passed to AddSameDocRef2.
print $xml1->getXml() . "\n";

$gen->AddSameDocRef2('','sha1',$xml1,'');

$gen->SetRefIdAttr('','Reference-24eb6003-d41c-442c-a731-d4c58f94790b');

// -------- Reference 2 --------
$gen->AddObjectRef('Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties','sha1','','','http://uri.etsi.org/01903#SignedProperties');

// -------- Reference 3 --------
$gen->AddSameDocRef('Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo','sha1','','','');

// Provide a certificate + private key. (PFX password is test123)
$cert = new CkCert();
$success = $cert->LoadPfxFile('qa_data/pfx/cert_test123.pfx','test123');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$gen->SetX509Cert($cert,true);

$gen->put_KeyInfoType('X509Data+KeyValue');
$gen->put_X509Type('CertChain');

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

$gen->put_Behaviors('IndentedSignature');

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

$numSigs = $verifier->get_NumSignatures();
$verifyIdx = 0;
while ($verifyIdx < $numSigs) {
    $verifier->put_Selector($verifyIdx);
    $verified = $verifier->VerifySignature(true);
    if ($verified != true) {
        print $verifier->lastErrorText() . "\n";
        exit;
    }

    $verifyIdx = $verifyIdx + 1;
}

print 'All signatures were successfully verified.' . "\n";

?>