(Delphi ActiveX) PKCS11 Sign PDF using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to sign a PDF 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.

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
pkcs11: TChilkatPkcs11;
pin: WideString;
userType: Integer;
success: Integer;
cert: TChilkatCert;
pdf: TChilkatPdf;
json: TChilkatJsonObject;
i: Integer;

begin
// 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);

pkcs11.SharedLibPath := 'C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll';
pin := '0000';
userType := 1;

// Establish a PKCS11 logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
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.
// There are other ways to locate a certificate on the HSM.
// This example assumes there is a single certificate w/ 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 PDF signing code is the same as for a cert obtained from any other source..

pdf := TChilkatPdf.Create(Self);

// Load a PDF to be signed.
success := pdf.LoadFile('qa_data/pdf/hello.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);

json.UpdateInt('page',1);
json.UpdateString('appearance.y','top');
json.UpdateString('appearance.x','left');
json.UpdateString('appearance.fontScale','10.0');
json.UpdateString('signingAlgorithm','pss');
json.UpdateString('hashAlgorithm','sha256');

i := 0;
json.I := i;
json.UpdateString('appearance.text[i]','Digitaly signed by: Xyz Widgets, Inc.');
i := i + 1;
json.I := i;
json.UpdateString('appearance.text[i]','current_dt');
i := i + 1;
json.I := i;
json.UpdateString('appearance.text[i]','blah blah blah');

// The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
success := pdf.SetSigningCert(cert.ControlInterface);

success := pdf.SignPdf(json.ControlInterface,'qa_output/out.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

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

// 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;