[qemu.git] / scripts / signrom.py

#
# Option ROM signing utility
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.

import sys
import struct

if len(sys.argv) < 3:
    print('usage: signrom.py input output')
    sys.exit(1)

fin = open(sys.argv[1], 'rb')
fout = open(sys.argv[2], 'wb')

fin.seek(2)
size = ord(fin.read(1)) * 512 - 1

fin.seek(0)
data = fin.read(size)
fout.write(data)

checksum = 0
for b in data:
    # catch Python 2 vs. 3 differences
    if isinstance(b, int):
        checksum += b
    else:
        checksum += ord(b)
checksum = (256 - checksum) % 256

# Python 3 no longer allows chr(checksum)
fout.write(struct.pack('B', checksum))

fin.close()
fout.close()
Commit	Line	Data
0d6b9cc7 JK	1	#
	2	# Option ROM signing utility
	3	#
	4	# Authors:
	5	# Jan Kiszka <jan.kiszka@siemens.com>
	6	#
	7	# This work is licensed under the terms of the GNU GPL, version 2 or later.
	8	# See the COPYING file in the top-level directory.
	9
	10	import sys
	11	import struct
	12
	13	if len(sys.argv) < 3:
	14	print('usage: signrom.py input output')
	15	sys.exit(1)
	16
	17	fin = open(sys.argv[1], 'rb')
	18	fout = open(sys.argv[2], 'wb')
	19
	20	fin.seek(2)
	21	size = ord(fin.read(1)) * 512 - 1
	22
	23	fin.seek(0)
	24	data = fin.read(size)
	25	fout.write(data)
	26
	27	checksum = 0
	28	for b in data:
	29	# catch Python 2 vs. 3 differences
	30	if isinstance(b, int):
	31	checksum += b
	32	else:
	33	checksum += ord(b)
	34	checksum = (256 - checksum) % 256
	35
	36	# Python 3 no longer allows chr(checksum)
	37	fout.write(struct.pack('B', checksum))
	38
	39	fin.close()
	40	fout.close()