(Chilkat2-Python) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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.

# Load the XAdES file to be validated..
sbXml = chilkat2.StringBuilder()
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8")
if (success == False):
    print("Failed to load XAdES input file.")
    sys.exit()

validator = chilkat2.XmlDSig()

# Specify a set of absolute or relative directory paths to be searched for any external file references.
# Directory paths are separated by semicolon chars.
validator.ExternalRefDirs = "qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir"

success = validator.LoadSignatureSb(sbXml)
if (success == False):
    print(validator.LastErrorText)
    sys.exit()

# Validate signatures as usual..
i = 0
while i < validator.NumSignatures :
    validator.Selector = i

    valid = validator.VerifySignature(True)
    print("Signature " + str(i + 1) + " and all reference digests OK = " + str(valid))

    i = i + 1