#
# regenerate_test_vector.py
# -----------------------------------------------------------
# Generates a new randomized test vector for ecdsa_fpga_model
#
# Author: Pavel Shatov
# Copyright (c) 2017-2018, NORDUnet A/S
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# - Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
#
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
# - Neither the name of the NORDUnet nor the names of its contributors may
#   be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

#
USAGE = "USAGE: regenerate_test_vector.py [openssl_binary]"
#

# This script generates a test vector. The test vector contains two
# private keys. One is for P-256, the other one is for P-384.
#

#
# imports
#
import sys
import subprocess

OPENSSL = ""

CURVE_P256 = "prime256v1"
CURVE_P384 = "secp384r1"

SECRET_CHARLIE_256 = "charlie_p256.key"
SECRET_CHARLIE_384 = "charlie_p384.key"

def openssl_ecparam_genkey(openssl, curve, file):
    subprocess.call([openssl, "ecparam", "-genkey", "-name", curve, "-out", file])

#
# __main__
#
if __name__ == "__main__":

    # detect whether user requested some specific binary
    if len(sys.argv) == 1:
        OPENSSL = "openssl"
        print("Using system OpenSSL library.")
    elif len(sys.argv) == 2:
        OPENSSL = sys.argv[1]
        print("Using OpenSSL binary '" + OPENSSL + "'...")
    else:
        print(USAGE)

    if len(OPENSSL) > 0:
        
        # generate a new private key for P-256 curve
        openssl_ecparam_genkey(OPENSSL, CURVE_P256, SECRET_CHARLIE_256)
    
        # generate a new private key for P-384 curve
        openssl_ecparam_genkey(OPENSSL, CURVE_P384, SECRET_CHARLIE_384)
        
        # done
        print("New randomized test vector generated.")


#
# End of file
#