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#!/bin/sh
FILE=$1
FIRMWARE_KEY=$2
if [[ -f "$FILE" ]]; then
DATA=$(head -2 $FILE | grep "smime." 2>&1)
if [[ $DATA =~ '"smime.' ]]; then
cp $FILE $FILE.bak
OPENSSL_RESULT=$(openssl smime -decrypt -in $FILE.bak -inkey $FIRMWARE_KEY 2>&1 > $FILE)
if [[ -f "$FILE" && $OPENSSL_RESULT == '' ]]; then
echo "${FILE} has been decrypted"
rm -rf $FILE.bak
else
mv $FILE.bak $FILE
echo "${FILE} has not been decrypted, the key is probably invalid !"
echo "Stopping"
exit 1
fi
else
echo "${FILE} seems already decrypted !"
fi
else
echo "${FILE} not found !"
fi
exit 0
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