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/*
* onion.h -- Implementation of the onion part of docs/Prevent_Tracking.txt
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef ONION_H
#define ONION_H
#include "DHT.h"
typedef struct {
DHT *dht;
Networking_Core *net;
uint8_t secret_symmetric_key[crypto_secretbox_KEYBYTES];
} Onion;
#define ONION_RETURN_1 (crypto_secretbox_NONCEBYTES + sizeof(IP_Port) + crypto_secretbox_MACBYTES)
#define ONION_RETURN_2 (crypto_secretbox_NONCEBYTES + sizeof(IP_Port) + crypto_secretbox_MACBYTES + ONION_RETURN_1)
#define ONION_RETURN_3 (crypto_secretbox_NONCEBYTES + sizeof(IP_Port) + crypto_secretbox_MACBYTES + ONION_RETURN_2)
#define ONION_SEND_BASE (crypto_box_PUBLICKEYBYTES + sizeof(IP_Port) + crypto_box_MACBYTES)
#define ONION_SEND_3 (crypto_box_NONCEBYTES + ONION_SEND_BASE + ONION_RETURN_2)
#define ONION_SEND_2 (crypto_box_NONCEBYTES + ONION_SEND_BASE*2 + ONION_RETURN_1)
#define ONION_SEND_1 (crypto_box_NONCEBYTES + ONION_SEND_BASE*3)
/* Create and send a onion packet.
*
* nodes is a list of 4 nodes, the packet will route through nodes 0, 1, 2 and the data
* with length length will arrive at 3.
*
* return -1 on failure.
* return 0 on success.
*/
int send_onion_packet(DHT *dht, Node_format *nodes, uint8_t *data, uint32_t length);
/* Create and send a onion response sent initially to dest with.
*
* return -1 on failure.
* return 0 on success.
*/
int send_onion_response(Networking_Core *net, IP_Port dest, uint8_t *data, uint32_t length, uint8_t *ret);
Onion *new_onion(DHT *dht);
void kill_onion(Onion *onion);
#endif
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