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40 lines
778 B
40 lines
778 B
#
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# Option ROM signing utility
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#
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# Authors:
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# Jan Kiszka <jan.kiszka@siemens.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or later.
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# See the COPYING file in the top-level directory.
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import sys
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import struct
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if len(sys.argv) < 3:
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print('usage: signrom.py input output')
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sys.exit(1)
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fin = open(sys.argv[1], 'rb')
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fout = open(sys.argv[2], 'wb')
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fin.seek(2)
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size = ord(fin.read(1)) * 512 - 1
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fin.seek(0)
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data = fin.read(size)
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fout.write(data)
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checksum = 0
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for b in data:
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# catch Python 2 vs. 3 differences
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if isinstance(b, int):
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checksum += b
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else:
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checksum += ord(b)
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checksum = (256 - checksum) % 256
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# Python 3 no longer allows chr(checksum)
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fout.write(struct.pack('B', checksum))
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fin.close()
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fout.close()
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