skdpserver.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.
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 * 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 SKDP_SERVER_H
#define SKDP_SERVER_H
 
#include "common.h"
#include "skdp.h"
#include "../../QSC/QSC/rcs.h"
#include "../../QSC/QSC/socketserver.h"


SKDP_EXPORT_API typedef struct skdp_server_state
{
    qsc_rcs_state rxcpr;               
    qsc_rcs_state txcpr;               
    uint8_t did[SKDP_KID_SIZE];         
    uint8_t dsh[SKDP_STH_SIZE];         
    uint8_t kid[SKDP_KID_SIZE];         
    uint8_t ssh[SKDP_STH_SIZE];         
    uint8_t sdk[SKDP_SDK_SIZE];         
    uint64_t expiration;              
    uint64_t rxseq;                        
    uint64_t txseq;                        
    skdp_flags exflag;                  
} skdp_server_state;

SKDP_EXPORT_API void skdp_server_connection_close(skdp_server_state* ctx, qsc_socket* sock, skdp_errors error);

SKDP_EXPORT_API void skdp_server_send_error(const qsc_socket* sock, skdp_errors error);

SKDP_EXPORT_API skdp_errors skdp_server_send_keep_alive(skdp_keep_alive_state* kctx, const qsc_socket* sock);

SKDP_EXPORT_API void skdp_server_initialize(skdp_server_state* ctx, const skdp_server_key* skey);

SKDP_EXPORT_API skdp_errors skdp_server_listen_ipv4(skdp_server_state* ctx, qsc_socket* sock, const qsc_ipinfo_ipv4_address* address, uint16_t port);

SKDP_EXPORT_API skdp_errors skdp_server_listen_ipv6(skdp_server_state* ctx, qsc_socket* sock, const qsc_ipinfo_ipv6_address* address, uint16_t port);

SKDP_EXPORT_API skdp_errors skdp_server_decrypt_packet(skdp_server_state* ctx, const skdp_network_packet* packetin, uint8_t* message, size_t* msglen);

SKDP_EXPORT_API skdp_errors skdp_server_encrypt_packet(skdp_server_state* ctx, const uint8_t* message, size_t msglen, skdp_network_packet* packetout);

SKDP_EXPORT_API skdp_errors skdp_server_ratchet_response(skdp_server_state* ctx, skdp_network_packet* packetout);
 
#endif