CkPython

Get Certificate CRL Distribution Points

See more Certificates Examples

Demonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point.

Note: This example requires Chilkat v9.5.0.76 or greater.

CkPython

import sys
import chilkat

success = False

cert = chilkat.CkCert()

success = cert.LoadFromFile("qa_data/certs/test_haswdt.cer")
if (success != True):
    print(cert.lastErrorText())
    sys.exit()

# Get the CRL Distribution Points extension, which is at OID 2.5.29.31
extensionXmlStr = cert.getExtensionAsXml("2.5.29.31")
if (cert.get_LastMethodSuccess() == False):
    print("Certificate does not have the CDP extension.")
    sys.exit()

xml = chilkat.CkXml()
xml.LoadXml(extensionXmlStr)

# See what we have..
print(xml.getXml())

# We should get XML like this:

# <?xml version="1.0" encoding="utf-8" ?>
# <sequence>
#     <sequence>
#         <contextSpecific tag="0" constructed="1">
#             <contextSpecific tag="0" constructed="1">
#                 <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
# cmVFbWFpbENBLmNybA==</contextSpecific>
#             </contextSpecific>
#         </contextSpecific>
#     </sequence>
# </sequence>
# 

# Assuming there is one CRL Distribution Point...
sbDistPoint = chilkat.CkStringBuilder()
success = xml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint)
if (success == True):
    sbDistPoint.Decode("base64","utf-8")
    print("CRL Distribution Point:  " + sbDistPoint.getAsString())

# Sample output:
# CRL Distribution Point:  http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl