gpgit

#!/bin/bash

# GPGit
#
# Linux bash script to strengthen symmetric file encryption by GnuPG.
#
# Usage:      gpgit <filename> [-c]
#
#                 -c to apply cascade encryption
#
# Author:     Martin Latter, 23/03/2016, 18/10/2016
# Version:    0.14
# License:    GNU GPL version 3.0 (GPL v3); http://www.gnu.org/licenses/gpl.html
# Link:       https://github.com/Tinram/GPGit.git


if [ "$#" -lt 1 ] || [ "$1" == "-c" ] ; then
    echo "usage: gpgit <filename> [-c]"
    exit 1
fi


FILENAME="$1"
CASCADE="$2"


# can use either gpg or gpg2
# replace 'gpg' with 'gpg2' below if gpg2 is available
gpg -c --s2k-mode 3 --s2k-count 65011712 --s2k-digest-algo SHA512 --cipher-algo AES256 --require-secmem -z 9 "$FILENAME"


# cascade encryption: two passphrases required, take the resulting <filename>.gpg.gpg file
if [ "$CASCADE" == "-c" ]; then
    echo "applying cascade encryption: second password required ..."
    gpg -c --s2k-mode 3 --s2k-count 65011712 --s2k-digest-algo SHA512 --cipher-algo TWOFISH --require-secmem -z 9 "$FILENAME.gpg"
fi