chacha.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_CHACHA20_H
#define QSC_CHACHA20_H
 
#include "common.h"
#include "poly1305.h"
 
QSC_CPLUSPLUS_ENABLED_START


#define QSC_CHACHA_BLOCK_SIZE 64ULL

#define QSC_CHACHA_KEY128_SIZE 16ULL

#define QSC_CHACHA_KEY256_SIZE 32ULL

#define QSC_CHACHA_NONCE_SIZE 12ULL

#define QSC_CHACHA_ROUND_COUNT 20ULL

QSC_EXPORT_API typedef struct
{
    uint32_t state[16]; 
} qsc_chacha_state;

QSC_EXPORT_API typedef struct
{
    const uint8_t* key; 
    size_t keylen;      
    uint8_t* nonce;     
} qsc_chacha_keyparams;

QSC_EXPORT_API void qsc_chacha_dispose(qsc_chacha_state* ctx);

QSC_EXPORT_API void qsc_chacha_initialize(qsc_chacha_state* ctx, const qsc_chacha_keyparams* keyparams);

QSC_EXPORT_API void qsc_chacha_transform(qsc_chacha_state* ctx, uint8_t* output, const uint8_t* input, size_t length);
 
/* chacha-poly1305*/
 
QSC_EXPORT_API typedef struct 
{
    qsc_chacha_state cstate;      
    qsc_poly1305_state pstate;    
    size_t aadlen;                
    size_t msglen;                
} qsc_chacha_poly1305_state;

QSC_EXPORT_API void qsc_chacha_poly1305_set_associated(qsc_chacha_poly1305_state* ctx, const uint8_t* data, size_t datalen);

QSC_EXPORT_API bool qsc_chacha_poly1305_decrypt(qsc_chacha_poly1305_state* ctx, uint8_t* output, const uint8_t* input, size_t length);

QSC_EXPORT_API void qsc_chacha_poly1305_dispose(qsc_chacha_poly1305_state* ctx);

QSC_EXPORT_API void qsc_chacha_poly1305_initialize(qsc_chacha_poly1305_state* ctx, const qsc_chacha_keyparams* keyparams);

QSC_EXPORT_API void qsc_chacha_poly1305_encrypt(qsc_chacha_poly1305_state* ctx, uint8_t* output, const uint8_t* input, size_t length);
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif