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|
#!/bin/sh
# __________ __ ___.
# Open \______ \ ____ ____ | | _\_ |__ _______ ___
# Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
# Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
# Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
# \/ \/ \/ \/ \/
# $Id$
#
# Purpose of this script:
#
# Inputs: music player model name and a file name
#
# Action: Build a valid mi4 file (prepending and appending magic)
# Encrypt the file with TEA encryption so that the model's own
# bootloader accepts this file.
# Sign the file with a DSA signature the bootloader accepts
#
# Output: A built, encrypted and signed mi4 file image.
#
# Requirement:
#
# This script assumes that you have the mi4code tool in your path, that
# you have the environment variable MI4CODE pointing to the tool or that you
# have it in the same dir that you invoke this script with.
#
# mi4 info and tool are here: http://daniel.haxx.se/sansa/mi4.html
#
mkmi4=$0
target=$1
input=$2
output=$3
# scan the $PATH for the given command
findtool(){
file="$1"
IFS=":"
for path in $PATH
do
# echo "checks for $file in $path" >&2
if test -f "$path/$file"; then
echo "$path/$file"
return
fi
done
}
help () {
echo "Usage: mi4fix.sh <e200/h10/h10_5gb/elio> <input> <output>"
exit
}
if test -z "$output"; then
help
fi
# sign - if the firmware should be DSA signed with a dummy (only 010301
# firmwares)
# tea - name of the TEA crypt key to use for encrypting, but only if ...
# encrypt - is set to "yes" for encrypting the firmware
case $target in
# fake example)
# sign="yes"
# encrypt="yes"
# tea=targetkey
# ;;
e200)
sign="yes"
;;
h10)
sign="yes"
;;
h10_5gb)
buildopt="-2"
;;
elio)
buildopt="-2"
;;
*)
echo "unsupported target"
help
;;
esac
if test -z "$MI4CODE"; then
tool=`findtool mi4code`
if test -z "$tool"; then
# not in path
tool=`dirname $mkmi4`/mi4code
if ! test -f $tool; then
echo "Couldn't find mi4code"
exit
fi
fi
else
tool=$MI4CODE
fi
# Use full file plaintext length if not encrypting
if test -z "$encrypt"; then
buildopt="$buildopt -pall"
fi
# build mi4
#echo "$tool build $input $output.raw"
$tool build $buildopt $input $output.raw
# encrypt
if test -n "$encrypt"; then
#echo "$tool encrypt $output.raw $output.encrypt $tea"
$tool encrypt $output.raw $output.encrypt $tea
else
# Even if we don't encrypt we need to do this to ensure the crc gets fixed
$tool encrypt -pall $output.raw $output.encrypt default
fi
# sign
if test -n "$sign"; then
#echo "$tool sign $output.encrypt $output"
$tool sign $output.encrypt $output
else
mv $output.encrypt $output
fi
|
