hash.py

#!/usr/bin/env python3
#
# Copyright (c) 2018 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause


import hashlib
import sys
import argparse
from intelhex import IntelHex


def parse_args():
    parser = argparse.ArgumentParser(
        description='Hash data from file.',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        allow_abbrev=False)

    parser.add_argument('--infile', '-i', '--in', '-in', required=True,
                        help='Hash the contents of the specified file. If a *.hex file is given, the contents will '
                             'first be converted to binary, with all non-specified area being set to 0xff. '
                             'For all other file types, no conversion is done.')
    return parser.parse_args()


if __name__ == '__main__':
    args = parse_args()

    if args.infile.endswith('.hex'):
        ih = IntelHex(args.infile)
        ih.padding = 0xff  # Allows hashing with empty regions
        to_hash = ih.tobinstr()
    else:
        to_hash = open(args.infile, 'rb').read()
    sys.stdout.buffer.write(hashlib.sha256(to_hash).digest())