CkPython

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.

CkPython

import sys
import chilkat

success = False

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

pdf = chilkat.CkPdf()

# Load the PDF that has already been signed.
success = pdf.LoadFile("qa_data/pdf/helloWorld_signed.pdf")
if (success == False):
    print(pdf.lastErrorText())
    sys.exit()

json = chilkat.CkJsonObject()

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):
    print(pdf.lastErrorText())
    sys.exit()

print("Successfully added a Document Timestamp Signature to the PDF")