blob: 975b27dd602150f64cf4fe213225f5cf2f66f77a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
#!/bin/sh
# Option ROM Signing utility
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
#
# Copyright Novell Inc, 2009
# Authors: Alexander Graf <agraf@suse.de>
#
# Syntax: signrom.sh <input> <output>
# did we get proper arguments?
test "$1" -a "$2" || exit 1
sum=0
# find out the file size
x=`dd if="$1" bs=1 count=1 skip=2 2>/dev/null | od -t u1 -A n`
#size=`expr $x \* 512 - 1`
size=$(( $x * 512 - 1 ))
# now get the checksum
nums=`od -A n -t u1 -v "$1"`
for i in ${nums}; do
# add each byte's value to sum
sum=`expr $sum + $i`
done
sum=$(( $sum % 256 ))
sum=$(( 256 - $sum ))
sum_octal=$( printf "%o" $sum )
# and write the output file
cp "$1" "$2"
printf "\\$sum_octal" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null
|
