Chilkat2-Python

Load .crl, Convert to XML, Get Revoked Serial Numbers and Dates

See more Certificates Examples

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

import sys
import chilkat2

success = False

# 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