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