chacha.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
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 * 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
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 * - This software is licensed under the Quantum Resistant Cryptographic Solutions
 *   Public Research and Evaluation License (QRCS-PREL), 2025-2026.
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 * EXPERIMENTAL CRYPTOGRAPHY NOTICE:
 * Portions of this software may include experimental, novel, or evolving
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 * 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.
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 * Written by: John G. Underhill
 * Contact: contact@qrcscorp.ca
 */
 
#ifndef QSC_CHACHA20_H
#define QSC_CHACHA20_H
 
#include "qsccommon.h"
#include "poly1305.h"
 
QSC_CPLUSPLUS_ENABLED_START


#define QSC_CHACHA_BLOCK_SIZE 64U

#define QSC_CHACHA_KEY128_SIZE 16U

#define QSC_CHACHA_KEY256_SIZE 32U

#define QSC_CHACHA_NONCE_SIZE 12U

#define QSC_CHACHA_ROUND_COUNT 20U

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