Pascal (Lazarus/Delphi)

Add a Document Timestamp Signature to an already-signed PDF

See more PDF Signatures Examples

Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Pdf,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  pdf: TPdf;
  json: TJsonObject;

begin
  success := False;

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

  pdf := TPdf.Create;

  //  Load the PDF that has already been signed.
  success := pdf.LoadFile('qa_data/pdf/helloWorld_signed.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;

  json.UpdateBool('invisibleSignature',True);
  json.UpdateString('subFilter','/ETSI.RFC3161');

  json.UpdateBool('timestampToken.enabled',True);

  //  In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
  json.UpdateString('timestampToken.tsaUrl','http://timestamp.digicert.com');

  //  If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
  json.UpdateString('timestampToken.tsaUsername','the_tsa_username');
  json.UpdateString('timestampToken.tsaPassword','the_tsa_password');

  //  When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
  //  This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
  //  has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
  json.UpdateBool('timestampToken.requestTsaCert',True);

  success := pdf.SignPdf(json,'c:/temp/qa_output/helloWorld_signed_2.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  WriteLn('Successfully added a Document Timestamp Signature to the PDF');


  pdf.Free;
  json.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.