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#!/usr/bin/env python
#
# This file is part of pyasn1-modules software.
#
# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
# License: https://www.pysnmp.com/pyasn1/license.html
#
# Read ASN.1/PEM X.509 certificates on stdin, parse each into plain text,
# then build substrate from it
#
import sys
from pyasn1.codec.der import decoder, encoder
from pyasn1_modules import pem, rfc2459
if len(sys.argv) != 1:
print(
"""Usage:
$ cat CACertificate.pem | %s
$ cat userCertificate.pem | %s"""
% (sys.argv[0], sys.argv[0])
)
sys.exit(-1)
certType = rfc2459.Certificate()
certCnt = 0
while True:
idx, substrate = pem.readPemBlocksFromFile(
sys.stdin, ("-----BEGIN CERTIFICATE-----", "-----END CERTIFICATE-----")
)
if not substrate:
break
cert, rest = decoder.decode(substrate, asn1Spec=certType)
if rest:
substrate = substrate[: -len(rest)]
print(cert.prettyPrint())
assert encoder.encode(cert) == substrate, "cert recode fails"
certCnt += 1
print("*** %s PEM cert(s) de/serialized" % certCnt)
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