#!/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 CMP message on stdin, parse into
# plain text, then build substrate from it
#
import sys

from pyasn1 import debug
from pyasn1.codec.der import decoder, encoder

from pyasn1_modules import pem, rfc4210

if len(sys.argv) == 2 and sys.argv[1] == "-d":
    debug.setLogger(debug.Debug("all"))
elif len(sys.argv) != 1:
    print(
        """Usage:
$ cat cmp.pem | %s [-d]"""
        % sys.argv[0]
    )
    sys.exit(-1)

pkiMessage = rfc4210.PKIMessage()

substrate = pem.readBase64FromFile(sys.stdin)
if not substrate:
    sys.exit(0)

pkiMsg, rest = decoder.decode(substrate, asn1Spec=pkiMessage)

print(pkiMsg.prettyPrint())

assert encoder.encode(pkiMsg) == substrate, "CMP message recode fails"