csg.h

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/* 2020-2026 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 herein are proprietary to QRCS and are
 * protected under applicable Canadian, U.S., and international copyright,
 * patent, and trade secret laws.
 *
 * CRYPTOGRAPHIC ALGORITHMS AND IMPLEMENTATIONS:
 * - This software includes implementations of cryptographic primitives and
 *   algorithms that are standardized or in the public domain, such as AES
 *   and SHA-3, which are not proprietary to QRCS.
 * - This software also includes cryptographic primitives, constructions, and
 *   algorithms designed by QRCS, including but not limited to RCS, SCB, CSX, QMAC, and
 *   related components, which are proprietary to QRCS.
 * - All source code, implementations, protocol compositions, optimizations,
 *   parameter selections, and engineering work contained in this software are
 *   original works of QRCS and are protected under this license.
 *
 * LICENSE AND USE RESTRICTIONS:
 * - This software is licensed under the Quantum Resistant Cryptographic Solutions
 *   Public Research and Evaluation License (QRCS-PREL), 2025-2026.
 * - Permission is granted solely for non-commercial evaluation, academic research,
 *   cryptographic analysis, interoperability testing, and feasibility assessment.
 * - Commercial use, production deployment, commercial redistribution, or
 *   integration into products or services is strictly prohibited without a
 *   separate written license agreement executed with QRCS.
 * - Licensing and authorized distribution are solely at the discretion of QRCS.
 *
 * EXPERIMENTAL CRYPTOGRAPHY NOTICE:
 * Portions of this software may include experimental, novel, or evolving
 * cryptographic designs. Use of this software is entirely at the user's risk.
 *
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 * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING FROM THE USE OR MISUSE OF THIS SOFTWARE.
 *
 * FULL LICENSE:
 * This software is subject to the Quantum Resistant Cryptographic Solutions
 * Public Research and Evaluation License (QRCS-PREL), 2025-2026. The complete license terms
 * are provided in the accompanying LICENSE file or at https://www.qrcscorp.ca.
 *
 * Written by: John G. Underhill
 * Contact: contact@qrcscorp.ca
 */
 
#ifndef QSC_CSG_H
#define QSC_CSG_H
 
#include "qsccommon.h"
#include "sha3.h"
 
QSC_CPLUSPLUS_ENABLED_START


#define QSC_CSG_256_SEED_SIZE 32UL

#define QSC_CSG_512_SEED_SIZE 64UL

#define QSC_CSG_RESEED_THRESHHOLD 1024000UL

QSC_EXPORT_API typedef struct
{
    qsc_keccak_state kstate;            
    uint8_t cache[QSC_KECCAK_256_RATE]; 
    size_t bctr;                        
    size_t cpos;                        
    size_t crmd;                        
    size_t rate;                        
    bool pres;                          
} qsc_csg_state;

QSC_EXPORT_API void qsc_csg_dispose(qsc_csg_state* ctx);

QSC_EXPORT_API void qsc_csg_initialize(qsc_csg_state* ctx, const uint8_t* seed, size_t seedlen, const uint8_t* info, size_t infolen, bool predres);

QSC_EXPORT_API void qsc_csg_generate(qsc_csg_state* ctx, uint8_t* output, size_t otplen);

QSC_EXPORT_API void qsc_csg_update(qsc_csg_state* ctx, const uint8_t* seed, size_t seedlen);
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif