(Delphi ActiveX) 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.

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;
cert: TChilkatCert;
sbXml: TChilkatStringBuilder;
verifier: TChilkatXmlDSig;
verified: Integer;

begin
success := 0;

// Load the XML to be signed.
xmlToSign := TChilkatXml.Create(Self);
success := xmlToSign.LoadXmlFile('qa_data/fattura_electronica/docToSign.xml');
if (success = 0) then
  begin
    Memo1.Lines.Add(xmlToSign.LastErrorText);
    Exit;
  end;

gen := TChilkatXmlDSigGen.Create(Self);

gen.SigLocation := 'p:FatturaElettronica';
gen.SigId := 'xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504';
gen.SigNamespacePrefix := 'ds';
gen.SigNamespaceUri := 'http://www.w3.org/2000/09/xmldsig#';
gen.SigValueId := 'xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue';
gen.SignedInfoCanonAlg := 'C14N';
gen.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 := TChilkatXml.Create(Self);
object1.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',1,'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:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod',1,'Algorithm','http://www.w3.org/2001/04/xmlenc#sha256');
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');

gen.AddObject('',object1.GetXml(),'','');

// -------- Reference 1 --------
gen.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 := TChilkatCert.Create(Self);

//  You may provide the PIN here..
cert.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 = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

gen.SetX509Cert(cert.ControlInterface,1);
gen.KeyInfoType := 'X509Data';
gen.X509Type := 'Certificate';

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

gen.Behaviors := 'IndentedSignature,ForceAddEnvelopedSignatureTransform';

// Sign the XML...
success := gen.CreateXmlDSigSb(sbXml.ControlInterface);
if (success = 0) 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 signature we just produced...
verifier := TChilkatXmlDSig.Create(Self);
success := verifier.LoadSignatureSb(sbXml.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(verifier.LastErrorText);
    Exit;
  end;

verified := verifier.VerifySignature(1);
if (verified <> 1) then
  begin
    Memo1.Lines.Add(verifier.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('This signature was successfully verified.');
end;