| #!/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 |
