Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson

lnSuccess = 0

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

loPdf = CreateObject('Chilkat.Pdf')

* Load the PDF that has already been signed.
lnSuccess = loPdf.LoadFile("qa_data/pdf/helloWorld_signed.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

loJson = CreateObject('Chilkat.JsonObject')

loJson.UpdateBool("invisibleSignature",1)
loJson.UpdateString("subFilter","/ETSI.RFC3161")

loJson.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.
loJson.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.
loJson.UpdateString("timestampToken.tsaUsername","the_tsa_username")
loJson.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.)
loJson.UpdateBool("timestampToken.requestTsaCert",1)

lnSuccess = loPdf.SignPdf(loJson,"c:/temp/qa_output/helloWorld_signed_2.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    CANCEL
ENDIF

? "Successfully added a Document Timestamp Signature to the PDF"

RELEASE loPdf
RELEASE loJson