hcg.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_HCG_H
#define QSC_HCG_H
 
#include "common.h"
#include "sha2.h"
 
QSC_CPLUSPLUS_ENABLED_START


#define QSC_HCG_KEY_SIZE 64ULL

#define QSC_HCG_INFO_SIZE 19ULL

#define QSC_HCG_MAX_INFO_SIZE 56ULL

#define QSC_HCG_NONCE_SIZE 8ULL

#define QSC_HCG_RESEED_THRESHHOLD 65535ULL

#define QSC_HCG_SEED_SIZE 64ULL

QSC_EXPORT_API typedef struct
{
    uint8_t key[QSC_HCG_KEY_SIZE];          
    uint8_t info[QSC_HCG_MAX_INFO_SIZE];    
    uint8_t nonce[QSC_HCG_NONCE_SIZE];      
    size_t inflen;                          
    size_t rpos;                            
    bool pres;                              
} qsc_hcg_state;

QSC_EXPORT_API void qsc_hcg_dispose(qsc_hcg_state* ctx);

QSC_EXPORT_API void qsc_hcg_initialize(qsc_hcg_state* ctx, const uint8_t* seed, size_t seedlen, const uint8_t* info, size_t infolen, bool pres);

QSC_EXPORT_API void qsc_hcg_generate(qsc_hcg_state* ctx, uint8_t* output, size_t otplen);

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