Delphi DLL Requires Chilkat v9.5.0.85+

Sign PDF with Timestamp from TSA (Timestamp Server Authority)

See more PDF Signatures Examples

This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). Delphi DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
cert: HCkCert;

begin
success := False;

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

pdf := CkPdf_Create();

//  Load a PDF to be signed.
//  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success := CkPdf_LoadFile(pdf,'qa_data/pdf/hello.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

//  Options for signing are specified in JSON.
json := CkJsonObject_Create();

//  In most cases, the signingCertificateV2 and signingTime attributes are required.
CkJsonObject_UpdateInt(json,'signingCertificateV2',1);
CkJsonObject_UpdateInt(json,'signingTime',1);

//  Tell Chilkat to create an LTV-enabled (long term validation) signature.
//  See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
CkJsonObject_UpdateBool(json,'ltvOcsp',True);

//  Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
//  in the CMS signature's authentication attributes
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);

//  Define the appearance of the signature.
CkJsonObject_UpdateInt(json,'page',1);
CkJsonObject_UpdateString(json,'appearance.y','top');
CkJsonObject_UpdateString(json,'appearance.x','left');
CkJsonObject_UpdateString(json,'appearance.fontScale','10.0');
CkJsonObject_UpdateString(json,'appearance.text[0]','Digitally signed by: cert_cn');
CkJsonObject_UpdateString(json,'appearance.text[1]','current_dt');
CkJsonObject_UpdateString(json,'appearance.text[2]','This is an LTV-enabled signature with a TSA timestamp.');

//  Load the signing certificate. (Use your own certificate.)
cert := CkCert_Create();
success := CkCert_LoadPfxFile(cert,'qa_data/pfx/myPdfSigningCert.pfx','pfxPassword');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

//  Tell the pdf object to use the certificate for signing.
success := CkPdf_SetSigningCert(pdf,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

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

Memo1.Lines.Add('The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.');

//  If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
//  and contains an embedded timestamp:
//  

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);
CkCert_Dispose(cert);