fencrypt

#!/bin/bash

#Title: fencrypt
#Author: Nathan Thompson
#Date: Jan 17/17

if [[ $1 = "-e" ]]; then
	
	#first uses tar to archive and zip the folder
	tar -czf "$2.tar.gz" "$2" 

	#gpg is used to encrypt the archive
	gpg -o "encrypted.$2" --symmetric --cipher-algo AES256 "$2.tar.gz"
	
	#the temporary compressed folder is then removed
	rm "$2.tar.gz"

	echo -n "Delete original unencrypted file of $2?(y/N) > "
	read answer
	if [ "$answer" == "y" ]; then
		
		rm -r $2
		echo "Unencrypted original of $2 removed."
	fi

	if [ $? -eq 0 ]; then
		echo "Successfully encrypted $2 as encrypted.$2!"
	else
		echo "Failed to encrypt $2"
	fi

elif [[ $1 = "-d" ]]; then

	#gpg first decrypts the file	
	gpg -o "decrypted$2" -d "$2"

	#next tar decompresses the folder	
	tar -xzf "decrypted$2"

	#next the temporary compressed tar file is removed
	rm "decrypted$2"
	
	if [ $? -eq 0 ]; then
		echo "Successfully decrypted $2"
		echo -n "Remove encrypted original of $2?(y/N) > "
		read answer
		if [ "$answer" == "y" ]; then
		
			rm $2
			echo "Encrypted original of $2 removed."
		fi
	else
		echo "Failed to decrypt $2"
	fi

elif [[ $1 = "-h" ]]; then

	echo "This shell script encrypts or decrypts a specified directory/folder using AES256"
	echo "-------------------------------------"
	echo "Options:"
	echo "	-e: Encrypts specified file"
	echo "	-d: Decrypts specified file"
	echo "-------------------------------------"
	echo "Example of encryption:"
	echo "	bash fencrypt -e mydirectory" 
	echo "Example of decryption:"
	echo "	bash fencrypt -d myencrypteddirectory"
	echo "-------------------------------------"
	echo "Author: Nathan Thompson"

	
else
	echo "Error: invalid option. Try -h for instructions."

fi