hkds_client.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.
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 * 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.
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 *   are original works of QRCS and are protected under this license.
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 * Written by: John G. Underhill
 * Contact: john.underhill@protonmail.com
 */
 
#ifndef HKDS_CLIENT_H
#define HKDS_CLIENT_H
 
#include "hkds_config.h"


HKDS_EXPORT_API typedef struct
{
    uint8_t edk[HKDS_EDK_SIZE];
    uint8_t ksn[HKDS_KSN_SIZE];
    uint8_t tkc[HKDS_CACHE_SIZE][HKDS_MESSAGE_SIZE];
    bool cache_empty;
} hkds_client_state;

HKDS_EXPORT_API bool hkds_client_decrypt_token(hkds_client_state* state, const uint8_t* etok, uint8_t* token);

HKDS_EXPORT_API bool hkds_client_encrypt_message(hkds_client_state* state, const uint8_t* plaintext, uint8_t* ciphertext);

HKDS_EXPORT_API bool hkds_client_encrypt_authenticate_message(hkds_client_state* state, const uint8_t* plaintext, const uint8_t* data, size_t datalen, uint8_t* ciphertext);

HKDS_EXPORT_API void hkds_client_generate_cache(hkds_client_state* state, const uint8_t* token);

HKDS_EXPORT_API void hkds_client_initialize_state(hkds_client_state* state, const uint8_t* edk, const uint8_t* did);
 
 
#endif