Chilkat2-Python

Binary Certificate Extension Data

See more Certificates Examples

Demonstrates how to binary certificate extension data by OID.

The GetExtensionBd method is added in Chilkat v9.5.0.96.

Chilkat2-Python

import sys
import chilkat2

success = False

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