ntru.h

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/*
 * 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_NTRU_H
#define QSC_NTRU_H
 
#include "common.h"
#include "ntrubase.h"
 
QSC_CPLUSPLUS_ENABLED_START

 
#if defined(QSC_NTRU_S1HPS2048509)

#   define QSC_NTRU_CIPHERTEXT_SIZE 699ULL

#   define QSC_NTRU_PRIVATEKEY_SIZE 6492ULL

#   define QSC_NTRU_PUBLICKEY_SIZE 699ULL
 
#elif defined(QSC_NTRU_S3HPS2048677)

#   define QSC_NTRU_CIPHERTEXT_SIZE 930ULL

#   define QSC_NTRU_PRIVATEKEY_SIZE 1234ULL

#   define QSC_NTRU_PUBLICKEY_SIZE 930ULL
 
#elif defined(QSC_NTRU_S5HPS4096821)

#   define QSC_NTRU_CIPHERTEXT_SIZE 1230ULL

#   define QSC_NTRU_PRIVATEKEY_SIZE 1590ULL

#   define QSC_NTRU_PUBLICKEY_SIZE 1230ULL
 
#elif defined(QSC_NTRU_S5HRSS701)

#   define QSC_NTRU_CIPHERTEXT_SIZE 1138ULL

#   define QSC_NTRU_PRIVATEKEY_SIZE 1450ULL

#   define QSC_NTRU_PUBLICKEY_SIZE 1138ULL
 
#else
#   error "The NTRU parameter set is invalid!"
#endif

#define QSC_NTRU_SEED_SIZE 32ULL

#define QSC_NTRU_SHAREDSECRET_SIZE 32ULL

#define QSC_NTRU_ALGNAME "NTRU"

QSC_EXPORT_API bool qsc_ntru_decapsulate(uint8_t* secret, const uint8_t* ciphertext, const uint8_t* privatekey);

QSC_EXPORT_API bool qsc_ntru_decrypt(uint8_t* secret, const uint8_t* ciphertext, const uint8_t* privatekey);

QSC_EXPORT_API void qsc_ntru_encapsulate(uint8_t* secret, uint8_t* ciphertext, const uint8_t* publickey, bool (*rng_generate)(uint8_t*, size_t));

QSC_EXPORT_API void qsc_ntru_encrypt(uint8_t* secret, uint8_t* ciphertext, const uint8_t* publickey, const uint8_t seed[QSC_NTRU_SEED_SIZE]);

QSC_EXPORT_API void qsc_ntru_generate_keypair(uint8_t* publickey, uint8_t* privatekey, bool (*rng_generate)(uint8_t*, size_t));
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif