kem_combiner.cpp - mozsearch

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/*

 * Copyright (c) 2024, [MTG AG](https://www.mtg.de).

 * All rights reserved.

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 * 1.  Redistributions of source code must retain the above copyright notice,

 *     this list of conditions and the following disclaimer.

 * 2.  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.

 * 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 OWNER 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,

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*/

#include "config.h"

#include "kem_combiner.hpp"

#if defined(ENABLE_PQC_DBG_LOG)

#include "crypto/mem.h"

#endif

namespace rnp {

std::vector<uint8_t>

PqcKemCombiner::compute(const std::vector<uint8_t> &mlkem_key_share,

                        const std::vector<uint8_t> &ecc_key_share,

                        const std::vector<uint8_t> &ecc_ciphertext,

                        const std::vector<uint8_t> &ecc_pub_key,

                        const pgp_pubkey_alg_t      alg_id)

    std::vector<uint8_t> out;

#if defined(ENABLE_PQC_DBG_LOG)

    RNP_LOG_NO_POS_INFO("Key Combiner Input: ");

    RNP_LOG_U8VEC(" - mlkemKeyShare: %s", mlkem_key_share);

    RNP_LOG_U8VEC(" - eccKeyShare: %s", ecc_key_share);

    RNP_LOG_U8VEC(" - eccCipherText: %s", ecc_ciphertext);

    RNP_LOG_U8VEC(" - eccPublicKey: %s", ecc_pub_key);

    RNP_LOG_NO_POS_INFO(" - algID: %d", (uint8_t) alg_id);

    RNP_LOG_NO_POS_INFO("Key Combiner Constants: ");

    RNP_LOG_U8VEC(" - DomSep %s", domSeparation());

#endif

    pgp_hash_alg_t hash_alg = PGP_HASH_SHA3_256;

    auto           hash = rnp::Hash::create(hash_alg);

    hash->add(mlkem_key_share);

    hash->add(ecc_key_share);

    hash->add(ecc_ciphertext);

    hash->add(ecc_pub_key);

    hash->add(&alg_id, 1);

    hash->add(domSeparation());

    out.resize(rnp::Hash::size(hash_alg));

    hash->finish(out.data());

#if defined(ENABLE_PQC_DBG_LOG)

    RNP_LOG_U8VEC("PQC KEM Combiner SHA-3 Output: %s", out);

#endif

    return out;

} // namespace rnp