#!/usr/bin/python3
#
#
# Formats a new test vector for ModExpNG core model.
#
#
# Copyright 2019 The Commons Conservancy Cryptech Project
# SPDX-License-Identifier: BSD-3-Clause
#
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# modification, are permitted provided that the following conditions are
# met:
#
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#   this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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import sys
import vector_util

SCRIPT_USAGE = "USAGE: vector_format.py [openssl_binary]"

KEY_LENGTH = 512

RNG_SEED_MESSAGE = 1
RNG_SEED_BLINDING = 2


if __name__ == "__main__":

    # ModInv fails otherwise...
    sys.setrecursionlimit(int(1.5 * KEY_LENGTH))

    OPENSSL_BINARY = vector_util.openssl_binary(SCRIPT_USAGE)

    if len(OPENSSL_BINARY) > 0:

        MESSAGE  = vector_util.random_message(RNG_SEED_MESSAGE, KEY_LENGTH)
        BLINDING = vector_util.random_blinding(RNG_SEED_BLINDING, KEY_LENGTH)
        VECTOR   = vector_util.load_vector(OPENSSL_BINARY, KEY_LENGTH)

        vector_ok = VECTOR.selfcheck(MESSAGE, BLINDING)
        if vector_ok:
            vector_util.save_vector(VECTOR)
            print("Test vector formatted.")
        else:
            print("Failed to format test vector.")