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PHP

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

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

$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 Xml();
$xmlToSign->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...');

echo $xmlToSign->GetXml(), "\n";

$gen = new XmlDSigGen();

$gen->SigLocation = 'doc';
$gen->SigLocationMod = 0;
$gen->SigId = 'Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature';
$gen->SigNamespacePrefix = 'ds';
$gen->SigNamespaceUri = 'http://www.w3.org/2000/09/xmldsig#';
$gen->SigValueId = 'Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue';
$gen->SignedInfoCanonAlg = 'C14N';
$gen->SignedInfoDigestMethod = 'sha1';

// Set the KeyInfoId before adding references..
$gen->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 Xml();
$object1->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', '');

echo $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 Xml();
$xml1->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.
echo $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 Cert();
try {
    $cert->LoadPfxFile('qa_data/pfx/cert_test123.pfx', 'test123');

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

    $gen->KeyInfoType = 'X509Data+KeyValue';
    $gen->X509Type = 'CertChain';

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

    $gen->Behaviors = 'IndentedSignature';

    // Sign the XML...
    $gen->CreateXmlDSigSb($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

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

echo $sbXml->GetAsString(), "\n";

// ----------------------------------------
// Verify the signatures we just produced...
$verifier = new XmlDSig();
try {
    $verifier->LoadSignatureSb($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$numSigs = $verifier->NumSignatures;
$verifyIdx = 0;
while ($verifyIdx < $numSigs) {
    $verifier->Selector = $verifyIdx;
    try {
        $verifier->VerifySignature(true);
    } catch (\Chilkat2\Exception $e) {
        echo $e->getMessage(), "\n";
        exit;
    }

    $verifyIdx = $verifyIdx + 1;
}

echo "All signatures were successfully verified.\n";