#!/bin/bash

# MIT License
#
# Copyright (c) 2020 Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri,
# Iaroslav Gridin, Alejandro Cabrera Aldaya, Billy Bob Brumley
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

if [[ $# -ne 1 ]]; then
    echo "Usage: $0 <path_to_single_json>"
    exit 1
fi

idx=${1}
sig_r=$(sed -n 's/^  "sig_r": "\(.*\)",$/\1/p' $idx)
sig_s=$(sed -n 's/^  "sig_s": "\(.*\)",$/\1/p' $idx)

GENCONF=$(cat <<-EOM
    asn1 = SEQUENCE:sig
    [sig]
    sig_r = INTEGER:$sig_r
    sig_s = INTEGER:$sig_s
EOM
)

openssl asn1parse -genconf <(echo "${GENCONF}") -noout -out /dev/stdout

