46 lines
1.3 KiB
Bash
Executable File
46 lines
1.3 KiB
Bash
Executable File
#!/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 -N $size "$1"`
|
|
for i in ${nums}; do
|
|
# add each byte's value to sum
|
|
sum=`expr \( $sum + $i \) % 256`
|
|
done
|
|
|
|
sum=$(( (256 - $sum) % 256 ))
|
|
sum_octal=$( 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
|