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|
#!/bin/bash
#
# Copyright (C) 2016 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Exit in error if we use an undefined variable (i.e. commit a typo).
set -u
terminate() { #cleanup and exit
rm -rf $stage
exit $1
}
usage () { #show usage and bail out
echo "USAGE:" >&2
echo " $1 [-e <ENCR_KEY_NUM> <ENCR_KEY_FILE>] [-s <PRIV_KEY_FILE> <PUB_KEY_FILE> [<SIG_TO_CHAIN_1> [<SIG_TO_CHAIN_2> [...]]]] < app.napp > app.final.napp" >&2
terminate -1
}
putchar() {
hexch="0123456789abcdef"
h=$[$1/16]
l=$[$1%16]
h=${hexch:$h:1}
l=${hexch:$l:1}
e="\x"$h$l
echo -ne $e
}
printhex() {
w3=$[$1/16777216]
t=$[$w3*16777216]
a=$[$1-$t]
w2=$[$a/65536]
t=$[$w2*65536]
a=$[$a-$t]
w1=$[$a/256]
w0=$[$a%256]
putchar $w0
putchar $w1
putchar $w2
putchar $w3
}
#save args and create temp dir
stage=$(mktemp -dt "$(basename $0).XXXXXXXXXX")
args=( "$@" )
#sanity checks (on the user)
if [ -t 1 ]
then
usage $0
fi
if [ -t 0 ]
then
usage $0
fi
#get encryption key if it exists & encrypt app
encr_key_num=""
if [ ${#args[@]} -ge 1 ]
then
if [[ ${args[0]} = "-e" ]]
then
if [ ${#args[@]} -lt 3 ]
then
usage $0
fi
encr_key_num=${args[1]}
encr_key_file=${args[2]}
args=("${args[@]:3}")
if [ ! -f "$encr_key_file" ]; then
usage $0
fi
nanoapp_encr encr "$encr_key_num" "$encr_key_file" > "$stage/postencr"
fi
fi
#if app is not encrypted, just copy it to staging area
if [ ! -f "$stage/postencr" ]; then
cat > "$stage/postencr"
fi
#handle signing
if [ ${#args[@]} -ge 1 ]
then
if [[ ${args[0]} = "-s" ]]
then
if [ ${#args[@]} -lt 3 ]
then
usage $0
fi
priv1=${args[1]}
pub1=${args[2]}
#make sure files exist
i=1
while [ $i -lt ${#args[@]} ]
do
if [ ! -f "${args[$i]}" ]; then
usage $0
fi
i=$[$i+1]
done
#get and save file size
signed_sz=$(du -b "$stage/postencr" | cut -f1)
nanoapp_sign sign "$priv1" "$pub1" < "$stage/postencr" > "$stage/sig"
#pad data to 16 bytes
t=$signed_sz
while [ $[$t%16] -ne 0 ]
do
echo -ne "\0" >> "$stage/postencr"
t=$(du -b "$stage/postencr" | cut -f1)
done
#produce signed output
cat "$stage/postencr" "$stage/sig" "$pub1" > "$stage/signed"
#append remaining chunks
i=3
while [ $i -lt ${#args[@]} ]
do
cat "${args[$i]}" >> "$stage/signed"
i=$[$i+1]
done
#create header
num_sigs=$[${#args[@]}-2]
echo -n SigndApp > "$stage/finished"
printhex $signed_sz >> "$stage/finished"
printhex $num_sigs >> "$stage/finished"
echo -ne "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" >> "$stage/finished"
cat "$stage/signed" >> "$stage/finished"
else
usage $0
fi
fi
#if app is not signed, just copy it to staging area
if [ ! -f "$stage/finished" ]; then
mv "$stage/postencr" "$stage/finished"
fi
#produce output
cat "$stage/finished"
terminate 0
|
