97 lines
3.1 KiB
Python
97 lines
3.1 KiB
Python
#!/usr/bin/python
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# -*- coding: UTF-8 -*-
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#/**
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# * Software Name : pycrate
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# * Version : 0.2
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# *
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# * Copyright © 2017. Benoit Michau. ANSSI.
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# *
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# * This program is free software: you can redistribute it and/or modify
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# * it under the terms of the GNU General Public License version 2 as published
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# * by the Free Software Foundation.
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# *
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# * This program is distributed in the hope that it will be useful,
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# * GNU General Public License for more details.
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# *
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# * You will find a copy of the terms and conditions of the GNU General Public
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# * License version 2 in the "license.txt" file or
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# * see http://www.gnu.org/licenses/ or write to the Free Software Foundation,
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# * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# *
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# *--------------------------------------------------------
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# * File Name : pycrate_berdecode.py
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# * Created : 2017-07-04
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# * Authors : Benoit Michau
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# *--------------------------------------------------------
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#*/
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import os
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import sys
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import argparse
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import pprint
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from binascii import unhexlify, hexlify
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from pycrate_core.utils import python_version, str_types, bytes_types
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from pycrate_core.charpy import Charpy
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from pycrate_asn1rt.codecs import ASN1CodecBER
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pprint.stdprinter = pprint.PrettyPrinter
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#
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class MyPrettyPrinter(pprint.stdprinter):
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RA = range(128)
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def _format(self, obj, *args, **kwargs):
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if isinstance(obj, str_types + bytes_types) and \
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not all([c in self.RA for c in obj]):
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obj = hexlify(obj)
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return pprint.stdprinter._format(self, obj, *args, **kwargs)
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#
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# enabling this will print hex stream for what looks like non-ascii str / bytes
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#pprint.PrettyPrinter=MyPrettyPrinter
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def main():
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parser = argparse.ArgumentParser(description='print any ASN.1 BER/CER/DER encoded objects '\
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'into a generic and nested tag-length-value structure')
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parser.add_argument('-i', dest='input', type=str,
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help='file containing the binary encoded objects')
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parser.add_argument('-s', dest='stream', type=bytes,
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help='hexadecimal string encoding the objects')
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#
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args = parser.parse_args()
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if args.input:
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try:
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fd = open(args.input, 'rb')
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except:
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print('%s, args error: file %s not found' % (sys.argv[0], args.input))
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return 0
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buf = fd.read()
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fd.close()
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elif args.stream:
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try:
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buf = unhexlify(args.stream)
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except:
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print('%s, args error: invalid hex stream' % (sys.argv[0], args.stream))
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return 0
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else:
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print('%s, args error: missing input encoded object' % sys.argv[0])
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return 0
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#
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char = Charpy(buf)
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cnt = 0
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while char.len_bit() >= 16:
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Obj, V = ASN1CodecBER.decode_tlv_ws(char)
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print('\n' + 14*'--' + ' object %i' % cnt + 14*'--' + '\n')
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pprint.pprint(V)
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cnt += 1
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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