shell script to make a file secured and ready for upload for web UI.

init.sh

sudo apt-get install par2
openssl genrsa -out ~/BACKUPMASTERKEY.pem 8192
openssl rsa -in ~/BACKUPMASTERKEY.pem -pubout >> ~/BACKUPMASTERKEY_pub.pem

lunch.sh

openssl rand -out /tmp/kkbackup.bin 512
openssl rsautl -encrypt -pubin -inkey ~/BACKUPMASTERKEY_pub.pem -in /tmp/kkbackup.bin -out file.secured 
openssl enc -aes-256-xts -salt -in backup.7z -out file.bin -pass file:/tmp/kkbackup.bin
rm /tmp/kkbackup.bin
echo "========================="
sha1sum file.bin
echo "========================="
rm backup.7z
split -b 50M file.bin file.bin.parts_
rm file.bin
par2create -r20 -l file.bin.rep file.bin.parts_* file.secured 

rearm.sh

par2repair file.bin.rep file.bin.parts_* file.secured
rm *.1
cat file.bin.parts_* >> file.bin
openssl rsautl -inkey ~/BACKUPMASTERKEY.pem -decrypt -out /tmp/kkbackup.bin -in file.secured
openssl enc -d -aes-256-xts -salt -in file.bin -out backup.7z -pass file:/tmp/kkbackup.bin
rm /tmp/kkbackup.bin
echo "========================="
sha1sum file.bin
echo "========================="
rm file.bin
rm file.bin.parts_*

Please make sure you have right to use 8192 bit rsa key before running.

backup.7z is the file will be progressed