(Chilkat2-Python) Sign PDF with Invisible Signature

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Demonstrates how to sign a PDF with an invisible signature.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

pdf = chilkat2.Pdf()

# 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 = chilkat2.JsonObject()

# 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 = chilkat2.Cert()
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: