(Delphi DLL) 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 non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Pdf, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pdf: HCkPdf;
success: Boolean;
json: HCkJsonObject;

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

pdf := CkPdf_Create();

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

json := CkJsonObject_Create();

CkJsonObject_UpdateBool(json,'invisibleSignature',True);
CkJsonObject_UpdateString(json,'subFilter','/ETSI.RFC3161');

CkJsonObject_UpdateBool(json,'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.
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'timestampToken.tsaUsername','the_tsa_username');
CkJsonObject_UpdateString(json,'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.)
CkJsonObject_UpdateBool(json,'timestampToken.requestTsaCert',True);

success := CkPdf_SignPdf(pdf,json,'c:/temp/qa_output/helloWorld_signed_2.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

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

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);

end;