(Delphi ActiveX) XML-DSig Add Reference with Transforms Specified Explicitly

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
xmlToSign: TChilkatXml;
gen: TChilkatXmlDSigGen;
object1: TChilkatXml;
xml1: TChilkatXml;
cert: TChilkatCert;
sbXml: TChilkatStringBuilder;
verifier: TChilkatXmlDSig;
numSigs: Integer;
verifyIdx: Integer;
verified: Integer;

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

success := 1;

// 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 := TChilkatXml.Create(Self);
xmlToSign.Tag := 'doc';
xmlToSign.UpdateAttrAt('s',1,'id','s1');
xmlToSign.UpdateChildContent('s','Some text...');
xmlToSign.UpdateChildContent('p','Some text...');
xmlToSign.UpdateAttrAt('p[1]',1,'class','note');
xmlToSign.UpdateChildContent('p[1]','A note...');

Memo1.Lines.Add(xmlToSign.GetXml());

gen := TChilkatXmlDSigGen.Create(Self);

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 := TChilkatXml.Create(Self);
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',1,'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:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod',1,'Algorithm','http://www.w3.org/2000/09/xmldsig#sha1');
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');
object1.UpdateAttrAt('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat',1,'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',1,'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','');

Memo1.Lines.Add(object1.GetXml());

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 := TChilkatXml.Create(Self);
xml1.Tag := 'ds:Transforms';
xml1.UpdateAttrAt('ds:Transform',1,'Algorithm','http://www.w3.org/TR/2001/REC-xml-c14n-20010315');
xml1.UpdateAttrAt('ds:Transform[1]',1,'Algorithm','http://www.w3.org/2000/09/xmldsig#enveloped-signature');
xml1.UpdateAttrAt('ds:Transform[2]',1,'Algorithm','http://www.w3.org/TR/1999/REC-xpath-19991116');
xml1.UpdateAttrAt('ds:Transform[2]|ds:XPath',1,'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.
Memo1.Lines.Add(xml1.GetXml());

gen.AddSameDocRef2('','sha1',xml1.ControlInterface,'');

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 := TChilkatCert.Create(Self);
success := cert.LoadPfxFile('qa_data/pfx/cert_test123.pfx','test123');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;
gen.SetX509Cert(cert.ControlInterface,1);

gen.KeyInfoType := 'X509Data+KeyValue';
gen.X509Type := 'CertChain';

// Load XML to be signed...
sbXml := TChilkatStringBuilder.Create(Self);
xmlToSign.GetXmlSb(sbXml.ControlInterface);

gen.Behaviors := 'IndentedSignature';

// Sign the XML...
success := gen.CreateXmlDSigSb(sbXml.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gen.LastErrorText);
    Exit;
  end;
// -----------------------------------------------

// Save the signed XML to a file.
success := sbXml.WriteFile('qa_output/signedXml.xml','utf-8',0);

Memo1.Lines.Add(sbXml.GetAsString());

// ----------------------------------------
// Verify the signatures we just produced...
verifier := TChilkatXmlDSig.Create(Self);
success := verifier.LoadSignatureSb(sbXml.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(verifier.LastErrorText);
    Exit;
  end;

numSigs := verifier.NumSignatures;
verifyIdx := 0;
while verifyIdx < numSigs do
  begin
    verifier.Selector := verifyIdx;
    verified := verifier.VerifySignature(1);
    if (verified <> 1) then
      begin
        Memo1.Lines.Add(verifier.LastErrorText);
        Exit;
      end;
    verifyIdx := verifyIdx + 1;
  end;

Memo1.Lines.Add('All signatures were successfully verified.');
end;