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author | fishsoupisgood <github@madingley.org> | 2019-04-29 01:17:54 +0100 |
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committer | fishsoupisgood <github@madingley.org> | 2019-05-27 03:43:43 +0100 |
commit | 3f2546b2ef55b661fd8dd69682b38992225e86f6 (patch) | |
tree | 65ca85f13617aee1dce474596800950f266a456c /scripts/signrom.py | |
download | qemu-3f2546b2ef55b661fd8dd69682b38992225e86f6.tar.gz qemu-3f2546b2ef55b661fd8dd69682b38992225e86f6.tar.bz2 qemu-3f2546b2ef55b661fd8dd69682b38992225e86f6.zip |
Diffstat (limited to 'scripts/signrom.py')
-rw-r--r-- | scripts/signrom.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/scripts/signrom.py b/scripts/signrom.py new file mode 100644 index 00000000..f9c35ccf --- /dev/null +++ b/scripts/signrom.py @@ -0,0 +1,40 @@ +# +# 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() |