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- #!/usr/bin/env bash
- if [ -z "$1" ] || [ -z "$2" ] || [[ $2 != "encode" && $2 != "decode" && $2 != "encode_enc" ]]
- then echo "launch the script with the desired filename and operation"
- echo "./AmazonPrimeWhatever.sh FILENAME OPERATION(encode or decode)"
- exit
- fi
- # check for prerequisites:
- if ! [ -x "$(command -v convert)" ]; then
- echo 'Error: convert (part of the imagemagick suite) is not installed.' >&2
- exit 1
- fi
- if [ $2 = "encode_enc" ] || [ $(echo $1 | cut -d "_" -f1) = "FakeKittenENC" ]; then
- if ! [ -x "$(command -v gpg)" ]; then
- echo 'Error: gpg is not installed, it is needed for encryption/decryption' >&2
- exit 1
- fi
- fi
- if [ $2 = "encode" ] || [ $2 = "encode_enc" ]; then
- imagejpg="random.jpg"
- image="random.DNG"
- #generate random image:
- mx=320;my=256;head -c "$((3*mx*my))" /dev/urandom | convert -depth 8 -size "${mx}x${my}" RGB:- $imagejpg
- mv $imagejpg $image
- imagesize=$(du -b $image | cut -f1)
- if [ $2 = "encode" ]; then
- origsha=$(sha1sum $1 | cut -d " " -f1)
- destimage="FakeKitten_"$imagesize"_"$1"_"$origsha"_"$image
- mv $image $destimage
- dd if=$1 bs=1M >> "$destimage"
- echo "encode completed in $destimage"
- fi
- if [ $2 = "encode_enc" ]; then
- #
- gpg --symmetric --cipher-algo AES256 $1
- #
- origsha=$(sha1sum $1.gpg | cut -d " " -f1)
- destimage="FakeKittenENC_"$imagesize"_"$1.gpg"_"$origsha"_"$image
- mv $image $destimage
- dd if=$1.gpg bs=1M >> "$destimage"
- echo "encode completed in $destimage"
- fi
- fi
- if [ $2 = "decode" ]; then
- imageconst=$(echo $1 | cut -d "_" -f1)
- imagebs=$(echo $1 | cut -d "_" -f2)
- origname=$(echo $1 | cut -d "_" -f3)
- origsha=$(echo $1 | cut -d "_" -f4)
- origimage=$(echo $1 | cut -d "_" -f5)
- dd if=$1 bs=1M skip=$imagebs iflag=skip_bytes > "$origname"
- if [ $imageconst = "FakeKittenENC" ]; then
- #decrypt the file
- orignamenogpg=$(echo "$origname" | sed 's/.gpg//')
- gpg --output $orignamenogpg --decrypt $origname
- fi
- echo "decode completed in $origname, checking file integrity"
- echo $origsha" "$origname > $origname".sha1"
- shaoutput=$(sha1sum -c $origname".sha1")
- echo $shaoutput
- if [[ $shaoutput != *"OK"* ]]; then
- echo ""
- echo "!!! FAILED SHA VERIFICATION!!! EXITING"
- echo "!!! DELETING ALL CREATED FILES !!!"
- rm $origname
- rm $origname".sha1"
- exit
- fi
- if [ $imageconst = "FakeKittenENC" ]; then
- #remove the file that contains .gpg at the end
- rm $origname
- fi
- rm $origname".sha1"
- fi
- echo ""
- echo "end of my job"
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