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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_hash.sh - generates SHA512 hash output of the given key + Encryption parameters
# $1 - encrypted symmetric key
#
################################################################################################
# echo and options
# Linux honors escape sequence only when run with -e
# gtmcrypt_ref.h and gen_sym_hash.sh NEED to use the same value for
# the encryption parameter string(defined below).
# This is currently determined by the OS type. If this changes,
# please verify that UNIQ_ENC_PARAM_STRING in gtmcrypt_ref.h
# and encr_param_string in this module match.
if [ $# -lt 1 ]; then
$ECHO "Usage: $0 <encrypted symmetric key file>" ; exit 1
fi
hostos=`uname -s`
basedir=`dirname $0`
if [ ! -x $basedir/show_install_config.sh ]; then
echo "Cannot find show_install_config.sh in $basedir. Exiting"
exit 1
fi
algorithm=`$basedir/show_install_config.sh | awk '/^ALGORITHM/ {print $NF}'`
# temporary file
if [ -x "$(command -v mktemp)" ] ; then tmp_file=`mktemp`
else tmp_file=/tmp/`basename $0`_$$.tmp ; fi
touch $tmp_file
chmod go-rwx $tmp_file
trap 'rm -rf $tmp_file ; stty sane ; exit 1' HUP INT QUIT TERM TRAP
ECHO=/bin/echo
ECHO_OPTIONS=""
if [ "Linux" = $hostos ] ; then ECHO_OPTIONS="-e" ; fi;
encrypted_key_file="$1"
$ECHO $ECHO_OPTIONS $algorithm\\c >$tmp_file
# 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
# Get passphrase for GnuPG keyring
$ECHO $ECHO_OPTIONS Passphrase for keyring: \\c ; stty -echo ; read passphrase ; stty echo ; $ECHO ""
$ECHO $passphrase | $gpg --no-tty --batch --passphrase-fd 0 -d $encrypted_key_file | \
cat - $tmp_file | $gpg --print-md SHA512 | tr -d ' \n'
$ECHO
rm -f $tmp_file
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