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#!/bin/sh
#################################################################
# #
# Copyright (c) 2010-2021 Fidelity National Information #
# Services, Inc. and/or its subsidiaries. All rights reserved. #
# #
# This source code contains the intellectual property #
# of its copyright holder(s), and is made available #
# under a license. If you do not know the terms of #
# the license, please stop and do not read further. #
# #
#################################################################
#############################################################################################
#
# gen_sym_key.sh - generates a 32 byte random key using gpg --gen-random.
# The generated key is stored in the output file encrypted with the user's public key.
#
# $1 - Strength of the random bytes (0 - least; 2 - greatest)
# $2 - Output file name for generated key encrypted with user's public key
# $3- Rest of line is treated as a comment
#
#############################################################################################
SYM_KEY_LEN=32
hostos=`uname -s`
# echo and options
ECHO=/bin/echo
ECHO_OPTIONS=""
#Linux honors escape sequence only when run with -e
if [ "Linux" = "$hostos" ] ; then ECHO_OPTIONS="-e" ; fi
if [ $# -lt 2 ] ; then $ECHO Usage: "`basename $0` key_strength[0-2] output_file" ; exit 1 ; fi
# Identify GnuPG - it is required
gpg=`command -v gpg2`
if [ -z "$gpg" ] ; then gpg=`command -v gpg` ; fi
if [ -z "$gpg" ] ; then $ECHO "Unable to find gpg2 or gpg. Exiting" ; exit 1 ; fi
# Confirm ability to create output file
output_dir=`dirname $2` ; if [ -z "$output_dir" ] ; then output_dir=$PWD ; fi
if [ ! -w $output_dir ] ; then $ECHO "$output_dir does not exist or is not writable" ; exit 1 ; fi
if [ -f $2 ] ; then
if [ ! -w $2 ] ; then $ECHO "Unable to overwrite existing output file $2" ; exit 1 ; fi
fi
output_file=$2
random_strength=3
case $1 in
[0-2]) random_strength=$1 ;;
esac
while [ $random_strength -lt 0 -o $random_strength -gt 2 ] ; do
$ECHO $ECHO_OPTIONS "Please enter a preferred strength for the key (0/1/2/[?]):" \\c
read random_strength
case "$random_strength" in
[0-2]) ;;
*) random_strength=3
$ECHO
$ECHO "Choose a key strength 0 (weakest - for testing) through 2 (strongest - for production)."
$ECHO "Since 2 may use up all available entropy on your system and/or take some time"
$ECHO "it is recommended that you choose 2 only on desktop systems where you can"
$ECHO "more easily generate entropy by moving the mouse and typing."
$ECHO ;;
esac
done
# Get comment for key
shift 2
comment="$*" ; if [ -z "$comment" ] ; then comment="Key in $output_file created by $USER `date -u`" ; fi
dir_path=`dirname $0` ; if [ -z "$dir_path" ] ; then dir_path=$PWD ; fi
# If $gtm_encrypt_notty is defined, we want to use it.
notty=$gtm_encrypt_notty
# Generate random key and save the output encrypted and signed
$gpg $notty --gen-random $random_strength $SYM_KEY_LEN | \
$gpg $notty --armor --encrypt --default-recipient-self --comment "$comment" --output $output_file
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