kex.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 QSMP_KEX_H
#define QSMP_KEX_H
 
#include "common.h"
#include "../QSMP/qsmp.h"


typedef struct qsmp_kex_duplex_client_state
{
    uint8_t keyid[QSMP_KEYID_SIZE];                         
    uint8_t schash[QSMP_DUPLEX_SCHASH_SIZE];               
    uint8_t prikey[QSMP_ASYMMETRIC_PRIVATE_KEY_SIZE];     
    uint8_t pubkey[QSMP_ASYMMETRIC_PUBLIC_KEY_SIZE];       
    uint8_t rverkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];     
    uint8_t sigkey[QSMP_ASYMMETRIC_SIGNING_KEY_SIZE];     
    uint8_t ssec[QSMP_SECRET_SIZE];                         
    uint8_t verkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];       
    uint64_t expiration;                                  
} qsmp_kex_duplex_client_state;

typedef struct qsmp_kex_duplex_server_state
{
    uint8_t keyid[QSMP_KEYID_SIZE];                         
    uint8_t schash[QSMP_DUPLEX_SCHASH_SIZE];               
    uint8_t prikey[QSMP_ASYMMETRIC_PRIVATE_KEY_SIZE];     
    uint8_t pubkey[QSMP_ASYMMETRIC_PUBLIC_KEY_SIZE];       
    uint8_t rverkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];     
    uint8_t sigkey[QSMP_ASYMMETRIC_SIGNING_KEY_SIZE];     
    uint8_t verkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];       
    uint64_t expiration;                                  
    bool (*key_query)(uint8_t*, const uint8_t*);           
} qsmp_kex_duplex_server_state;

typedef struct qsmp_kex_simplex_client_state
{
    uint8_t keyid[QSMP_KEYID_SIZE];                         
    uint8_t rverkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];     
    uint8_t sigkey[QSMP_ASYMMETRIC_SIGNING_KEY_SIZE];     
    uint8_t schash[QSMP_SIMPLEX_SCHASH_SIZE];             
    uint8_t verkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];       
    uint64_t expiration;                                  
} qsmp_kex_simplex_client_state;

typedef struct qsmp_kex_simplex_server_state
{
    uint8_t keyid[QSMP_KEYID_SIZE];                         
    uint8_t schash[QSMP_SIMPLEX_SCHASH_SIZE];             
    uint8_t prikey[QSMP_ASYMMETRIC_PRIVATE_KEY_SIZE];     
    uint8_t pubkey[QSMP_ASYMMETRIC_PUBLIC_KEY_SIZE];       
    uint8_t sigkey[QSMP_ASYMMETRIC_SIGNING_KEY_SIZE];     
    uint8_t verkey[QSMP_ASYMMETRIC_VERIFY_KEY_SIZE];       
    uint64_t expiration;                                  
} qsmp_kex_simplex_server_state;

qsmp_errors qsmp_kex_duplex_server_key_exchange(qsmp_kex_duplex_server_state* kss, qsmp_connection_state* cns);

qsmp_errors qsmp_kex_duplex_client_key_exchange(qsmp_kex_duplex_client_state* kcs, qsmp_connection_state* cns);

qsmp_errors qsmp_kex_simplex_server_key_exchange(qsmp_kex_simplex_server_state* kss, qsmp_connection_state* cns);

qsmp_errors qsmp_kex_simplex_client_key_exchange(qsmp_kex_simplex_client_state* kcs, qsmp_connection_state* cns);

bool qsmp_kex_test();
 
 
#endif