sha2.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 Underhill
 * Contact: john.underhill@protonmail.com
 */
 
#ifndef QSC_SHA2_H
#define QSC_SHA2_H
 
#include "common.h"
 
QSC_CPLUSPLUS_ENABLED_START

 
#if !defined(QSC_SHA2_SHANI_ENABLED)
//#define QSC_SHA2_SHANI_ENABLED
#endif

#define QSC_HKDF_256_KEY_SIZE 32ULL

#define QSC_HKDF_512_KEY_SIZE 64ULL

#define QSC_HMAC_256_KEY_SIZE 32ULL

#define QSC_HMAC_512_KEY_SIZE 64ULL

#define QSC_HMAC_256_MAC_SIZE 32ULL

#define QSC_HMAC_512_MAC_SIZE 64ULL

#define QSC_HMAC_256_RATE 64ULL

#define QSC_HMAC_512_RATE 128ULL

#define QSC_SHA2_256_HASH_SIZE 32ULL

#define QSC_SHA2_384_HASH_SIZE 48ULL

#define QSC_SHA2_512_HASH_SIZE 64ULL

#define QSC_SHA2_256_RATE 64ULL

#define QSC_SHA2_384_RATE 128ULL

#define QSC_SHA2_512_RATE 128ULL

#define QSC_SHA2_STATE_SIZE 8ULL
 
/* SHA2-256 */

QSC_EXPORT_API typedef struct
{
    uint32_t state[QSC_SHA2_STATE_SIZE];    
    uint8_t  buffer[QSC_SHA2_256_RATE];     
    uint64_t t;                             
    size_t   position;                      
} qsc_sha256_state;

QSC_EXPORT_API void qsc_sha256_compute(uint8_t* output, const uint8_t* message, size_t msglen);

QSC_EXPORT_API void qsc_sha256_dispose(qsc_sha256_state* ctx);

QSC_EXPORT_API void qsc_sha256_finalize(qsc_sha256_state* ctx, uint8_t* output);

QSC_EXPORT_API void qsc_sha256_initialize(qsc_sha256_state* ctx);

QSC_EXPORT_API void qsc_sha256_permute(uint32_t* output, const uint8_t* input);

QSC_EXPORT_API void qsc_sha256_update(qsc_sha256_state* ctx, const uint8_t* message, size_t msglen);
 
/* SHA2-384 */

QSC_EXPORT_API typedef struct
{
    uint64_t state[QSC_SHA2_STATE_SIZE];    
    uint64_t t[2];                          
    uint8_t  buffer[QSC_SHA2_384_RATE];     
    size_t   position;                      
} qsc_sha384_state;

QSC_EXPORT_API void qsc_sha384_compute(uint8_t* output, const uint8_t* message, size_t msglen);

QSC_EXPORT_API void qsc_sha384_dispose(qsc_sha384_state* ctx);

QSC_EXPORT_API void qsc_sha384_finalize(qsc_sha384_state* ctx, uint8_t* output);

QSC_EXPORT_API void qsc_sha384_initialize(qsc_sha384_state* ctx);

QSC_EXPORT_API void qsc_sha384_update(qsc_sha384_state* ctx, const uint8_t* message, size_t msglen);
 
/* SHA2-512 */

QSC_EXPORT_API typedef struct
{
    uint64_t state[QSC_SHA2_STATE_SIZE];    
    uint64_t t[2];                          
    uint8_t  buffer[QSC_SHA2_512_RATE];     
    size_t   position;                      
} qsc_sha512_state;

QSC_EXPORT_API void qsc_sha512_compute(uint8_t* output, const uint8_t* message, size_t msglen);

QSC_EXPORT_API void qsc_sha512_dispose(qsc_sha512_state* ctx);

QSC_EXPORT_API void qsc_sha512_finalize(qsc_sha512_state* ctx, uint8_t* output);

QSC_EXPORT_API void qsc_sha512_initialize(qsc_sha512_state* ctx);

QSC_EXPORT_API void qsc_sha512_permute(uint64_t* output, const uint8_t* input);

QSC_EXPORT_API void qsc_sha512_update(qsc_sha512_state* ctx, const uint8_t* message, size_t msglen);
 
/* HMAC-256 */

QSC_EXPORT_API typedef struct
{
    qsc_sha256_state pstate;            
    uint8_t ipad[QSC_SHA2_256_RATE];    
    uint8_t opad[QSC_SHA2_256_RATE];    
} qsc_hmac256_state;

QSC_EXPORT_API void qsc_hmac256_compute(uint8_t* output, const uint8_t* message, size_t msglen, const uint8_t* key, size_t keylen);

QSC_EXPORT_API void qsc_hmac256_dispose(qsc_hmac256_state* ctx);

QSC_EXPORT_API void qsc_hmac256_finalize(qsc_hmac256_state* ctx, uint8_t* output);

QSC_EXPORT_API void qsc_hmac256_initialize(qsc_hmac256_state* ctx, const uint8_t* key, size_t keylen);

QSC_EXPORT_API void qsc_hmac256_update(qsc_hmac256_state* ctx, const uint8_t* message, size_t msglen);
 
/* HMAC-512 */

QSC_EXPORT_API typedef struct
{
    qsc_sha512_state pstate;            
    uint8_t ipad[QSC_SHA2_512_RATE];    
    uint8_t opad[QSC_SHA2_512_RATE];    
} qsc_hmac512_state;

QSC_EXPORT_API void qsc_hmac512_compute(uint8_t* output, const uint8_t* message, size_t msglen, const uint8_t* key, size_t keylen);

QSC_EXPORT_API void qsc_hmac512_dispose(qsc_hmac512_state* ctx);

QSC_EXPORT_API void qsc_hmac512_finalize(qsc_hmac512_state* ctx, uint8_t* output);

QSC_EXPORT_API void qsc_hmac512_initialize(qsc_hmac512_state* ctx, const uint8_t* key, size_t keylen);

QSC_EXPORT_API void qsc_hmac512_update(qsc_hmac512_state* ctx, const uint8_t* message, size_t msglen);
 
/* HKDF */

QSC_EXPORT_API void qsc_hkdf256_expand(uint8_t* output, size_t otplen, const uint8_t* key, size_t keylen, const uint8_t* info, size_t infolen);

QSC_EXPORT_API void qsc_hkdf256_extract(uint8_t* output, size_t otplen, const uint8_t* key, size_t keylen, const uint8_t* salt, size_t saltlen);

QSC_EXPORT_API void qsc_hkdf512_expand(uint8_t* output, size_t otplen, const uint8_t* key, size_t keylen, const uint8_t* info, size_t infolen);

QSC_EXPORT_API void qsc_hkdf512_extract(uint8_t* output, size_t otplen, const uint8_t* key, size_t keylen, const uint8_t* salt, size_t saltlen);
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif