(Chilkat2-Python) Binary Certificate Extension Data

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Demonstrates how to binary certificate extension data by OID.

The GetExtensionBd method is added in Chilkat v9.5.0.96.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

cert = chilkat2.Cert()

success = cert.LoadFromFile("qa_data/certs/testCert.cer")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

bd = chilkat2.BinData()

# The particular certificate in this test contains the following extensions

oid = "1.2.250.1.71.1.2.5"
success = cert.GetExtensionBd(oid,bd)
if (success == True):
    print(oid + ": " + bd.GetEncoded("hex_lower"))

oid = "1.2.250.1.71.1.2.2"
success = cert.GetExtensionBd(oid,bd)
if (success == True):
    print(oid + ": " + bd.GetEncoded("hex_lower"))

oid = "1.2.250.1.71.1.2.3"
success = cert.GetExtensionBd(oid,bd)
if (success == True):
    print(oid + ": " + bd.GetEncoded("hex_lower"))

oid = "1.2.250.1.71.1.2.7"
success = cert.GetExtensionBd(oid,bd)
if (success == True):
    print(oid + ": " + bd.GetEncoded("hex_lower"))

oid = "1.2.250.1.71.4.2.5"
success = cert.GetExtensionBd(oid,bd)
if (success == True):
    print(oid + ": " + bd.GetEncoded("hex_lower"))

# Sample output:
# 1.2.250.1.71.1.2.5: 040180
# 1.2.250.1.71.1.2.2: 020100
# 1.2.250.1.71.1.2.3: 1315383032353030303030312f32393030303539313432
# 1.2.250.1.71.1.2.7: 02010a
# 1.2.250.1.71.4.2.5: 30060c04534d3236

# The above binary values are actually ASN.1
# You can get the ASN.1 decoed by calling GetExtensionAsXml to get it in XML format,
# and then you extract the values from the XML.

oid = "1.2.250.1.71.1.2.5"
strXml = cert.GetExtensionAsXml(oid)
if (cert.LastMethodSuccess == True):
    print(oid + ": " + strXml)

oid = "1.2.250.1.71.1.2.2"
strXml = cert.GetExtensionAsXml(oid)
if (cert.LastMethodSuccess == True):
    print(oid + ": " + strXml)

oid = "1.2.250.1.71.1.2.3"
strXml = cert.GetExtensionAsXml(oid)
if (cert.LastMethodSuccess == True):
    print(oid + ": " + strXml)

oid = "1.2.250.1.71.1.2.7"
strXml = cert.GetExtensionAsXml(oid)
if (cert.LastMethodSuccess == True):
    print(oid + ": " + strXml)

oid = "1.2.250.1.71.4.2.5"
strXml = cert.GetExtensionAsXml(oid)
if (cert.LastMethodSuccess == True):
    print(oid + ": " + strXml)

# Sample output:
# 1.2.250.1.71.1.2.5: <octets>gA==</octets>
# 1.2.250.1.71.1.2.2: <int>00</int>
# 1.2.250.1.71.1.2.3: <printable>8025000001/2900059142</printable>
# 1.2.250.1.71.1.2.7: <int>0A</int>
# 1.2.250.1.71.4.2.5: <sequence><utf8>SM26</utf8></sequence>

# "gA==" is the base64 encoded byte values
# "0A" is hex for decimal 1