(Chilkat2-Python) Load .crl, Convert to XML, Get Revoked Serial Numbers and Dates

Load a binary .crl file (Certificate Revocation List), converts to XML, and then gets the revoked certificate serial numbers and revocation dates.

Note: This example requires Chilkat v9.5.0.77 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.

# Load a binary .crl file.
bdCrl = chilkat2.BinData()
success = bdCrl.LoadFile("qa_data/crl/ca1.crl")
if (success != True):
    print("Failed to load CRL file.")
    sys.exit()

asn = chilkat2.Asn()
success = asn.LoadBd(bdCrl)
if (success != True):
    print(asn.LastErrorText)
    sys.exit()

# Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
xml = chilkat2.Xml()
xml.LoadXml(asn.AsnToXml())
success = xml.SaveXml("qa_output/crl.xml")

# Use this online tool to generate parsing code from CRL XML: 
# Generate Parsing Code from XML

# Here's code to parse the XML.  This code was generated by the above tool,
# and then we modified it by removing unneeded code and changing some names

dt = chilkat2.CkDateTime()

i = 0
count_i = xml.NumChildrenHavingTag("sequence")
while i < count_i :
    xml.I = i

    j = 0
    count_j = xml.NumChildrenHavingTag("sequence[i]|sequence")
    while j < count_j :
        xml.J = j

        k = 0
        count_k = xml.NumChildrenHavingTag("sequence[i]|sequence[j]|sequence")
        while k < count_k :
            xml.K = k

            # Get the revoked certificate's serial number in uppercase hex.
            revokedCertSerialHex = xml.GetChildContent("sequence[i]|sequence[j]|sequence[k]|int")
            print("serial number: " + revokedCertSerialHex)

            # Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
            dateRevoked = xml.GetChildContent("sequence[i]|sequence[j]|sequence[k]|utctime")

            # Starting in Chilkat v9.5.0.77, date/time strings formatted as YYMMDDhhmmssZ can be parsed as follows:
            dt.SetFromTimestamp(dateRevoked)
            print("date revoked: " + dt.GetAsRfc822(False))

            k = k + 1

        j = j + 1

    i = i + 1