kyberbase.h

/* 2025 Quantum Resistant Cryptographic Solutions Corporation
 * All Rights Reserved.
 *
 * NOTICE: This software and all accompanying materials are the exclusive 
 * property of Quantum Resistant Cryptographic Solutions Corporation (QRCS).
 * The intellectual and technical concepts contained within this implementation 
 * are proprietary to QRCS and its authorized licensors and are protected under 
 * applicable U.S. and international copyright, patent, and trade secret laws.
 *
 * CRYPTOGRAPHIC STANDARDS:
 * - This software includes implementations of cryptographic algorithms such as 
 *   SHA3, AES, and others. These algorithms are public domain or standardized 
 *   by organizations such as NIST and are NOT the property of QRCS.
 * - However, all source code, optimizations, and implementations in this library 
 *   are original works of QRCS and are protected under this license.
 *
 * RESTRICTIONS:
 * - Redistribution, modification, or unauthorized distribution of this software, 
 *   in whole or in part, is strictly prohibited.
 * - This software is provided for non-commercial, educational, and research 
 *   purposes only. Commercial use in any form is expressly forbidden.
 * - Licensing and authorized distribution are solely at the discretion of QRCS.
 * - Any use of this software implies acceptance of these restrictions.
 *
 * DISCLAIMER:
 * This software is provided "as is," without warranty of any kind, express or 
 * implied, including but not limited to warranties of merchantability or fitness 
 * for a particular purpose. QRCS disclaims all liability for any direct, indirect, 
 * incidental, or consequential damages resulting from the use or misuse of this software.
 *
 * FULL LICENSE:
 * This software is subject to the **Quantum Resistant Cryptographic Solutions 
 * Proprietary License (QRCS-PL)**. The complete license terms are included 
 * in the LICENSE.txt file distributed with this software.
 *
 * Written by: John G. Underhill
 * Contact: john.underhill@protonmail.com
 */
 
#ifndef QSC_KYBERBASE_H
#define QSC_KYBERBASE_H
 
#include "common.h"
 
 /* \cond */
 
QSC_CPLUSPLUS_ENABLED_START

#if defined(QSC_KYBER_S1P1632)
#   define QSC_KYBER_K 2
#elif defined(QSC_KYBER_S3P2400)
#   define QSC_KYBER_K 3
#elif defined(QSC_KYBER_S5P3168)
#   define QSC_KYBER_K 4
#elif defined(QSC_KYBER_S6P3936)
#   define QSC_KYBER_K 5
#else
#   error "The Kyber parameter set is invalid!"
#endif

#define QSC_KYBER_N 256

#define QSC_KYBER_Q 3329

#define QSC_KYBER_ETA2 2

#define QSC_KYBER_MSGBYTES 32ULL

#define QSC_KYBER_SYMBYTES 32ULL

#define QSC_KYBER_POLYBYTES 384ULL
 
#if (QSC_KYBER_K == 2)
#   define QSC_KYBER_POLYCOMPRESSED_BYTES 128
#   define QSC_KYBER_POLYVECBASE_BYTES 320
#   define QSC_KYBER_ETA1 3
#elif (QSC_KYBER_K == 3)
#   define QSC_KYBER_POLYCOMPRESSED_BYTES 128
#   define QSC_KYBER_POLYVECBASE_BYTES 320
#   define QSC_KYBER_ETA1 2
#elif (QSC_KYBER_K == 4)
#   define QSC_KYBER_POLYCOMPRESSED_BYTES 160
#   define QSC_KYBER_POLYVECBASE_BYTES 352
#   define QSC_KYBER_ETA1 2
#elif (QSC_KYBER_K == 5)
#   define QSC_KYBER_POLYCOMPRESSED_BYTES 160
#   define QSC_KYBER_POLYVECBASE_BYTES 352
#   define QSC_KYBER_ETA1 2
#endif

#define QSC_KYBER_POLYVEC_COMPRESSED_BYTES (QSC_KYBER_K * QSC_KYBER_POLYVECBASE_BYTES)

#define QSC_KYBER_POLYVEC_BYTES (QSC_KYBER_K * QSC_KYBER_POLYBYTES)

#define QSC_KYBER_INDCPA_PUBLICKEY_BYTES (QSC_KYBER_POLYVEC_BYTES + QSC_KYBER_SYMBYTES)

#define QSC_KYBER_INDCPA_SECRETKEY_BYTES (QSC_KYBER_POLYVEC_BYTES)

#define QSC_KYBER_INDCPA_BYTES (QSC_KYBER_POLYVEC_COMPRESSED_BYTES + QSC_KYBER_POLYCOMPRESSED_BYTES)

#define QSC_KYBER_PUBLICKEY_BYTES  (QSC_KYBER_INDCPA_PUBLICKEY_BYTES)

#define QSC_KYBER_SECRETKEY_BYTES  (QSC_KYBER_INDCPA_SECRETKEY_BYTES + QSC_KYBER_INDCPA_PUBLICKEY_BYTES + 2 * QSC_KYBER_SYMBYTES)

#define QSC_KYBER_CIPHERTEXT_BYTES (QSC_KYBER_INDCPA_BYTES)
 
/* kem.h */

bool qsc_kyber_ref_decapsulate(uint8_t ss[QSC_KYBER_MSGBYTES], const uint8_t ct[QSC_KYBER_CIPHERTEXT_BYTES],
    const uint8_t sk[QSC_KYBER_SECRETKEY_BYTES]);

void qsc_kyber_ref_encapsulate(uint8_t ct[QSC_KYBER_CIPHERTEXT_BYTES], uint8_t ss[QSC_KYBER_MSGBYTES],
    const uint8_t pk[QSC_KYBER_PUBLICKEY_BYTES], bool (*rng_generate)(uint8_t*, size_t));

void qsc_kyber_ref_generate_keypair(uint8_t pk[QSC_KYBER_PUBLICKEY_BYTES], uint8_t sk[QSC_KYBER_SECRETKEY_BYTES], 
    bool (*rng_generate)(uint8_t*, size_t));
 
QSC_CPLUSPLUS_ENABLED_END
 
/* \endcond */
 
#endif