1 files changed, 45 insertions, 0 deletions
diff --git a/scripts/signrom.sh b/scripts/signrom.sh
new file mode 100755
index 0000000..9dc5c63
--- /dev/null
+++ b/scripts/signrom.sh
@@ -0,0 +1,45 @@
+#!/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