secrand.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.
 *
 * DISCLAIMER:
 * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, SECURITY, OR NON-INFRINGEMENT. QRCS DISCLAIMS ALL
 * 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_SECRAND_H
#define QSC_SECRAND_H
 
#include "qsccommon.h"
#include "async.h"
#include "csg.h"
 
QSC_CPLUSPLUS_ENABLED_START


#define QSC_SECRAND_SEED_SIZE 32ULL

#define QSC_SECRAND_CACHE_SIZE 1024ULL

QSC_EXPORT_API typedef struct
{
    qsc_csg_state hstate;                   
    uint8_t cache[QSC_SECRAND_CACHE_SIZE];  
    size_t cpos;                            
    bool init;                              
    qsc_mutex opmtx;                        
} qsc_secrand_state;

QSC_EXPORT_API int8_t qsc_secrand_next_char(void);

QSC_EXPORT_API uint8_t qsc_secrand_next_uchar(void);

QSC_EXPORT_API double qsc_secrand_next_double(void);

QSC_EXPORT_API int16_t qsc_secrand_next_int16(void);

QSC_EXPORT_API int16_t qsc_secrand_next_int16_max(int16_t maximum);

QSC_EXPORT_API int16_t qsc_secrand_next_int16_maxmin(int16_t maximum, int16_t minimum);

QSC_EXPORT_API uint16_t qsc_secrand_next_uint16(void);

QSC_EXPORT_API uint16_t qsc_secrand_next_uint16_max(uint16_t maximum);

QSC_EXPORT_API uint16_t qsc_secrand_next_uint16_maxmin(uint16_t maximum, uint16_t minimum);

QSC_EXPORT_API int32_t qsc_secrand_next_int32(void);

QSC_EXPORT_API int32_t qsc_secrand_next_int32_max(int32_t maximum);

QSC_EXPORT_API int32_t qsc_secrand_next_int32_maxmin(int32_t maximum, int32_t minimum);

QSC_EXPORT_API uint32_t qsc_secrand_next_uint32(void);

QSC_EXPORT_API uint32_t qsc_secrand_next_uint32_max(uint32_t maximum);

QSC_EXPORT_API uint32_t qsc_secrand_next_uint32_maxmin(uint32_t maximum, uint32_t minimum);

QSC_EXPORT_API int64_t qsc_secrand_next_int64(void);

QSC_EXPORT_API int64_t qsc_secrand_next_int64_max(int64_t maximum);

QSC_EXPORT_API int64_t qsc_secrand_next_int64_maxmin(int64_t maximum, int64_t minimum);

QSC_EXPORT_API uint64_t qsc_secrand_next_uint64(void);

QSC_EXPORT_API uint64_t qsc_secrand_next_uint64_max(uint64_t maximum);

QSC_EXPORT_API uint64_t qsc_secrand_next_uint64_maxmin(uint64_t maximum, uint64_t minimum);

QSC_EXPORT_API void qsc_secrand_dispose(void);

QSC_EXPORT_API void qsc_secrand_initialize(const uint8_t* seed, size_t seedlen, const uint8_t* custom, size_t custlen);

QSC_EXPORT_API bool qsc_secrand_generate(uint8_t* output, size_t length);
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif