Delphi ActiveX

PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

See more PKCS11 Examples

Sample code showing how to use PKCS11 to create an XML digital signature with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

Delphi ActiveX

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;
pkcs11: TChilkatPkcs11;
userType: Integer;
pin: WideString;
cert: TChilkatCert;
xml: TChilkatXml;
gen: TChilkatXmlDSigGen;
bUsePrivateKey: Integer;
sbXml: TChilkatStringBuilder;

begin
success := 0;

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

pkcs11 := TChilkatPkcs11.Create(Self);

// This example is tested on Windows using a Giesecke and Devrient Sm@rtCafe Expert 3.2 smart card.
// You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
// On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
// Otherwise provide the full path.
pkcs11.SharedLibPath := 'aetpkss1.dll';

// Make it an authenticated session by calling Login.
userType := 1;
// Make sure to use the correct PIN for your smart card..
pin := '0000';

success := pkcs11.QuickSession(userType,pin);
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    Exit;
  end;

// Get the certificate (on the smart card) that has a private key.
cert := TChilkatCert.Create(Self);
success := pkcs11.FindCert('privateKey','',cert.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Cert with private key: ' + cert.SubjectCN);
  end
else
  begin
    Memo1.Lines.Add('No certificates having a private key were found.');
    success := pkcs11.CloseSession();
    Exit;
  end;

// --------------------------------------------------------------------------
// At this point, we have the cert to be used for signing.
// Our XML signing code is the same as for a cert obtained from any other source..

// First generate the following XML to be signed:
// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
// <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
//     <SOAP-ENV:Header>
//         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
//     </SOAP-ENV:Header>
//     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
//         <z:FooBar xmlns:z="http://example.com" />
//     </SOAP-ENV:Body>
// </SOAP-ENV:Envelope>

xml := TChilkatXml.Create(Self);
xml.Tag := 'SOAP-ENV:Envelope';
xml.AddAttribute('xmlns:SOAP-ENV','http://schemas.xmlsoap.org/soap/envelope/');
xml.UpdateAttrAt('SOAP-ENV:Header|wsse:Security',1,'xmlns:wsse','http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd');
xml.UpdateAttrAt('SOAP-ENV:Header|wsse:Security',1,'SOAP-ENV:mustUnderstand','1');
xml.UpdateAttrAt('SOAP-ENV:Body',1,'xmlns:SOAP-SEC','http://schemas.xmlsoap.org/soap/security/2000-12');
xml.UpdateAttrAt('SOAP-ENV:Body',1,'SOAP-SEC:id','Body');
xml.UpdateAttrAt('SOAP-ENV:Body|z:FooBar',1,'xmlns:z','http://example.com');

gen := TChilkatXmlDSigGen.Create(Self);

// Indicate where the Signature will be inserted.
gen.SigLocation := 'SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security';

// Add a reference to the fragment of the XML to be signed.

// Note: "Body" refers to the XML element having an "id" equal to "Body", where "id" is case insensitive
// and where any namespace might qualify the attribute.  In this case, the SOAP-ENV:Body fragment is signed
// NOT because the tag = "Body", but because it has SOAP-SEC:id="Body"
gen.AddSameDocRef('Body','sha1','EXCL_C14N','','');

// (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
gen.SignedInfoPrefixList := 'wsse SOAP-ENV';

// Provide the private key for signing via the certificate, and indicate that
// we want the base64 of the certificate embedded in the KeyInfo.
gen.KeyInfoType := 'X509Data';
gen.X509Type := 'Certificate';

bUsePrivateKey := 1;
success := gen.SetX509Cert(cert.ControlInterface,bUsePrivateKey);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gen.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// Everything's specified.  Now create and insert the Signature
sbXml := TChilkatStringBuilder.Create(Self);
xml.EmitCompact := 1;
xml.GetXmlSb(sbXml.ControlInterface);

success := gen.CreateXmlDSigSb(sbXml.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gen.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// Examine the XML with the digital signature inserted
Memo1.Lines.Add(sbXml.GetAsString());

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

// Revert to an unauthenticated session by calling Logout.
success := pkcs11.Logout();
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
success := pkcs11.CloseSession();
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Success.');
end;