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130 lines
4.9 KiB
C
130 lines
4.9 KiB
C
/* net_crypto.h
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*
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* Functions for the core network crypto.
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*
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Copyright (C) 2013 Tox project All Rights Reserved.
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This file is part of Tox.
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Tox is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Tox is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NET_CRYPTO_H
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#define NET_CRYPTO_H
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#include "Lossless_UDP.h"
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//Our public key.
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extern uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
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extern uint8_t self_secret_key[crypto_box_SECRETKEYBYTES];
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#define ENCRYPTION_PADDING (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES)
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//encrypts plain of length length to encrypted of length + 16 using the
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//public key(32 bytes) of the receiver and the secret key of the sender and a 24 byte nonce
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//return -1 if there was a problem.
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//return length of encrypted data if everything was fine.
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int encrypt_data(uint8_t * public_key, uint8_t * secret_key, uint8_t * nonce,
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uint8_t * plain, uint32_t length, uint8_t * encrypted);
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//decrypts encrypted of length length to plain of length length - 16 using the
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//public key(32 bytes) of the sender, the secret key of the receiver and a 24 byte nonce
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//return -1 if there was a problem(decryption failed)
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//return length of plain data if everything was fine.
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int decrypt_data(uint8_t * public_key, uint8_t * secret_key, uint8_t * nonce,
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uint8_t * encrypted, uint32_t length, uint8_t * plain);
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//fill the given nonce with random bytes.
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void random_nonce(uint8_t * nonce);
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//return 0 if there is no received data in the buffer
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//return -1 if the packet was discarded.
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//return length of received data if successful
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int read_cryptpacket(int crypt_connection_id, uint8_t * data);
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//return 0 if data could not be put in packet queue
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//return 1 if data was put into the queue
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int write_cryptpacket(int crypt_connection_id, uint8_t * data, uint32_t length);
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//send a friend request to peer with public_key and ip_port.
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//Data represents the data we send with the friends request.
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//returns -1 on failure
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//returns a positive friend request id that can be used later to see if it was sent correctly on success.
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int send_friendrequest(uint8_t * public_key, IP_Port ip_port, uint8_t * data, uint32_t length);
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//return -1 if failure
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//return 0 if connection is still trying to send the request.
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//return 1 if sent correctly
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//return 2 if connection timed out
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int check_friendrequest(int friend_request);
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//puts the public key of the friend if public_key, the data from the request
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//in data if a friend request was sent to us and returns the length of the data.
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//return -1 if no valid friend requests.
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int handle_friendrequest(uint8_t * public_key, uint8_t * data);
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//Start a secure connection with other peer who has public_key and ip_port
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//returns -1 if failure
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//returns crypt_connection_id of the initialized connection if everything went well.
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int crypto_connect(uint8_t * public_key, IP_Port ip_port);
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//kill a crypto connection
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//return 0 if killed successfully
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//return 1 if there was a problem.
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int crypto_kill(int crypt_connection_id);
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//handle an incoming connection
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//return -1 if no crypto inbound connection
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//return incoming connection id (Lossless_UDP one) if there is an incoming crypto connection
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//Put the public key of the peer in public_key, the secret_nonce from the handshake into secret_nonce
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//and the session public key for the connection in session_key
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//to accept it see: accept_crypto_inbound(...)
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//to refuse it just call kill_connection(...) on the connection id
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int crypto_inbound(uint8_t * public_key, uint8_t * secret_nonce, uint8_t * session_key);
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//accept an incoming connection using the parameters provided by crypto_inbound
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//return -1 if not successful
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//returns the crypt_connection_id if successful
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int accept_crypto_inbound(int connection_id, uint8_t * public_key, uint8_t * secret_nonce, uint8_t * session_key);
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//return 0 if no connection, 1 we have sent a handshake, 2 if connexion is not confirmed yet
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//(we have received a handshake but no empty data packet), 3 if the connection is established.
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//4 if the connection is timed out and waiting to be killed
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int is_cryptoconnected(int crypt_connection_id);
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//Generate our public and private keys
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//Only call this function the first time the program starts.
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void new_keys();
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//run this to (re)initialize net_crypto
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//sets all the global connection variables to their default values.
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void initNetCrypto();
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//main loop
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void doNetCrypto();
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#endif
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