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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. #
# #
#################################################################
#############################################################################################
#
# encrypt_db_key.sh - encrypts the symmetric database key with the recipient's public key.
# The file is signed by the key provider.
#
# Arguments:
# $1 - Input file with symmetric encryption key protected with user's private key.
# $2 - Path of the output file.
# $3 - Email address of the public key's owner.
# Rest of line is comment for the output file
#
#############################################################################################
hostos=`uname -s`
# echo and options
ECHO=/bin/echo
ECHO_OPTIONS=""
#Linux honors escape sequence only when run with -e
if [ "Linux" = "$hostos" ] ; then ECHO_OPTIONS="-e" ; fi
# Input file, output file and recipient e-mail id are mandatory
if [ $# -lt 3 ]; then
$ECHO "Usage: `basename $0` input_key_file output_key_file recipient_id" ; exit 1
fi
# Identify GnuPG - it is required
gpg=`command -v gpg2`
if [ -z "$gpg" ] ; then gpg=`command -v gpg` ; fi
if [ -z "$gpg" ] ; then $ECHO "Unable to find gpg2 or gpg. Exiting" ; exit 1 ; fi
# Confirm existence of and ability to read input file
if [ ! -r "$1" ] ; then $ECHO $1 does not exist or is not readable ; exit 1 ; fi
input_file=$1
# 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 output file $2 ; exit 1 ; fi
fi
output_file=$2
recipient=$3
# Get comment for key, create default if none provided on command line
shift 3
comment="$*" ; if [ -z "$comment" ] ; then comment="$output_file created from $input_file for $recipient by $USER `date -u`" ; fi
# Get passphrase for GnuPG keyring
$ECHO $ECHO_OPTIONS Passphrase for keyring: \\c ; stty -echo ; read passphrase ; stty echo ; $ECHO ""
# Yes, providing the passphrase on the command line to the second gpg command is not ideal, but that
# is the best we can do with this reference implementation. Otherwise it must prompt twice.
echo $passphrase | $gpg --batch --passphrase-fd 0 --quiet --decrypt $input_file | \
$gpg --encrypt --armor --sign --output $output_file --comment "$comment" --recipient $recipient --batch --passphrase "$passphrase"
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