Chilkat2-Python

Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML. Chilkat2-Python

import sys
import chilkat2

success = False

asn = chilkat2.Asn()

# Begin with loading ASN.1 from a binary DER/BER format file.
success = asn.LoadBinaryFile("/Users/chilkat/testData/p7b/test.p7b")
if (success != True):
    print(asn.LastErrorText)
    sys.exit()

# Convert ASN.1 to XML:
strXml = asn.AsnToXml()
if (asn.LastMethodSuccess != True):
    print(asn.LastErrorText)
    sys.exit()

# The XML returned by AsnToXml will be compact and not pretty-formatted.
# Use Chilkat XML to format the XML better:
xml = chilkat2.Xml()
success = xml.LoadXml(strXml)
# Assuming success for this example..
# This is formatted better for human viewing:
print(xml.GetXml())

# Now get the ASN.1 in base64 format.  Any encoding supported
# by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
strBase64 = asn.GetEncodedDer("base64")

# Load the ASN.1 from XML:
asn2 = chilkat2.Asn()
success = asn2.LoadAsnXml(xml.GetXml())
if (success != True):
    print(asn2.LastErrorText)
    sys.exit()

# Load the ASN.1 from an encoded string, such as base64:
asn3 = chilkat2.Asn()
success = asn3.LoadEncoded(strBase64,"base64")
if (success != True):
    print(asn3.LastErrorText)
    sys.exit()