CkPython

Sign PDF with Invisible Signature

See more PDF Signatures Examples

Demonstrates how to sign a PDF with an invisible signature.

Note: This example requires Chilkat v9.5.0.85 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 a PDF to be signed.
#  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success = pdf.LoadFile("qa_data/pdf/hello.pdf")
if (success == False):
    print(pdf.lastErrorText())
    sys.exit()

#  Options for signing are specified in JSON.
json = chilkat.CkJsonObject()

#  In most cases, the signingCertificateV2 and signingTime attributes are required.
json.UpdateInt("signingCertificateV2",1)
json.UpdateInt("signingTime",1)

#  Indicate that the signature will be invisible.
json.UpdateBool("invisibleSignature",True)

#  Load the signing certificate. (Use your own certificate.)
cert = chilkat.CkCert()
success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

#  Tell the pdf object to use the certificate for signing.
success = pdf.SetSigningCert(cert)
if (success == False):
    print(pdf.lastErrorText())
    sys.exit()

success = pdf.SignPdf(json,"qa_output/hello_signed.pdf")
if (success == False):
    print(pdf.lastErrorText())
    sys.exit()

print("PDF successfully signed with an invisible signature.")

#  An invisible signature has no appearance within the PDF document itself,
#  but Adobe Acrobat will indicate the document is signed in a toolbar, as shown here:
#