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- #!/bin/bash
- #
- # Graphical utility to produce symmetric encryption using openssl's aes-256
- # cipher.
- #
- # Does not sign the message or produce public-key encryption. You've been
- # warned!
- #
- # Copyright 2016-2017 - Klaus Zimmermann <https://quitter.se/kzimmermann>
- #
- # This program is free software: you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation, either version 3 of the License, or
- # (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
- #
- crash() {
- # shorthand function that displays an error message and quits
- # $1 is the message to be displayed.
- echo "Error: $1"
- exit 1
- }
- encrypt() {
- # encrypts a message using openssl's aes-256-cbc cipher
- # arguments: MESSAGE, KEY
- tmp=$(echo "$1" | openssl aes-256-cbc -a -salt -pass pass:"$2")
- echo "$tmp" | sed "s/$\n//g"
- }
- decrypt() {
- # decrypts a message encrypted with the encrypt() function
- # arguments: MESSAGE, KEY
- echo "$1" | openssl aes-256-cbc -d -a -salt -pass pass:"$2" ||
- crash "decryption failed."
- }
- which openssl > /dev/null || crash "OpenSSL not found!"
- which zenity > /dev/null || crash "zenity not found!"
- while [[ true ]]
- do
- form_data=$(zenity --forms \
- --title "Simmetric Encryption Applet" \
- --text="Enter some text to encrypt and the session password" \
- --add-entry="Message" \
- --add-password="Session key" \
- --add-combo="Action:" \
- --combo-values="encrypt|decrypt" \
- ) || exit 0
- text=$(echo "$form_data" | cut -d "|" -f 1)
- key=$(echo "$form_data" | cut -d "|" -f 2)
- action=$(echo "$form_data" | cut -d "|" -f 3)
- case "$action" in
- "encrypt" )
- echo "$(encrypt "$text" "$key")"
- echo "$(encrypt "$text" "$key")" |
- zenity --text-info \
- --width 700 \
- --height 400 \
- --title "Encrypted session message"
- ;;
- "decrypt" )
- echo "$(decrypt "$text" "$key")" |
- zenity --text-info \
- --width 700 \
- --height 400 \
- --title "Decrypted session message"
- ;;
- * )
- echo "Please choose an action from the menu."
- ;;
- esac
- done
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