(CkPython) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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

import sys
import chilkat

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

pdf = chilkat.CkPdf()

# Load a PDF that has cryptographic signatures to be validated
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
if (success == False):
    print(pdf.lastErrorText())
    sys.exit()

# Each time we verify a signature, information about the signature is written into
# sigInfo (replacing whatever sigInfo previously contained).
sigInfo = chilkat.CkJsonObject()

# Iterate over each signature and validate each.
numSignatures = pdf.get_NumSignatures()
validated = False
cert = chilkat.CkCert()
i = 0
while i < numSignatures :
    validated = pdf.VerifySignature(i,sigInfo)
    print("Signature " + str(i) + " validated: " + str(validated))

    # The GetSignerCert method was added in Chilkat v9.5.0.87
    # After calling VerifySignature, you can get the signer certificate by calling
    # GetSignerCert with the same index. 
    success = pdf.GetSignerCert(i,cert)
    if (success != False):
        print("PDF signer certificate: " + cert.subjectDN())

    i = i + 1

print("Finished.")