(Delphi ActiveX) 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.

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
pdf: TChilkatPdf;
success: Integer;
json: TChilkatJsonObject;

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

pdf := TChilkatPdf.Create(Self);

// Load the PDF that has already been signed.
success := pdf.LoadFile('qa_data/pdf/helloWorld_signed.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);

json.UpdateBool('invisibleSignature',1);
json.UpdateString('subFilter','/ETSI.RFC3161');

json.UpdateBool('timestampToken.enabled',1);

// 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',1);

success := pdf.SignPdf(json.ControlInterface,'c:/temp/qa_output/helloWorld_signed_2.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Successfully added a Document Timestamp Signature to the PDF');
end;