154 lines
4.6 KiB
C++
154 lines
4.6 KiB
C++
/*
|
|
|
|
Copyright (c) 2007-2016, Un Shyam & Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
|
|
|
|
#ifndef TORRENT_PE_CRYPTO_HPP_INCLUDED
|
|
#define TORRENT_PE_CRYPTO_HPP_INCLUDED
|
|
|
|
#include "libtorrent/config.hpp"
|
|
|
|
// RC4 state from libtomcrypt
|
|
struct rc4 {
|
|
int x, y;
|
|
unsigned char buf[256];
|
|
};
|
|
|
|
void TORRENT_EXTRA_EXPORT rc4_init(const unsigned char* in, unsigned long len, rc4 *state);
|
|
unsigned long TORRENT_EXTRA_EXPORT rc4_encrypt(unsigned char *out, unsigned long outlen, rc4 *state);
|
|
|
|
#include "libtorrent/aux_/disable_warnings_push.hpp"
|
|
|
|
#include <boost/asio/buffer.hpp>
|
|
#include <list>
|
|
|
|
#include "libtorrent/aux_/disable_warnings_pop.hpp"
|
|
|
|
#include "libtorrent/receive_buffer.hpp"
|
|
#include "libtorrent/peer_id.hpp" // For sha1_hash
|
|
#include "libtorrent/extensions.hpp"
|
|
#include "libtorrent/assert.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
class TORRENT_EXTRA_EXPORT dh_key_exchange
|
|
{
|
|
public:
|
|
dh_key_exchange();
|
|
bool good() const { return true; }
|
|
|
|
// Get local public key, always 96 bytes
|
|
char const* get_local_key() const;
|
|
|
|
// read remote_pubkey, generate and store shared secret in
|
|
// m_dh_shared_secret.
|
|
int compute_secret(const char* remote_pubkey);
|
|
|
|
char const* get_secret() const { return m_dh_shared_secret; }
|
|
|
|
sha1_hash const& get_hash_xor_mask() const { return m_xor_mask; }
|
|
|
|
private:
|
|
|
|
int get_local_key_size() const
|
|
{ return sizeof(m_dh_local_key); }
|
|
|
|
char m_dh_local_key[96];
|
|
char m_dh_local_secret[96];
|
|
char m_dh_shared_secret[96];
|
|
sha1_hash m_xor_mask;
|
|
};
|
|
|
|
struct encryption_handler
|
|
{
|
|
int encrypt(std::vector<boost::asio::mutable_buffer>& iovec);
|
|
int decrypt(crypto_receive_buffer& recv_buffer, std::size_t& bytes_transferred);
|
|
|
|
bool switch_send_crypto(boost::shared_ptr<crypto_plugin> crypto
|
|
, int pending_encryption);
|
|
|
|
void switch_recv_crypto(boost::shared_ptr<crypto_plugin> crypto
|
|
, crypto_receive_buffer& recv_buffer);
|
|
|
|
bool is_send_plaintext() const
|
|
{
|
|
return m_send_barriers.empty() || m_send_barriers.back().next != INT_MAX;
|
|
}
|
|
|
|
bool is_recv_plaintext() const
|
|
{
|
|
return m_dec_handler.get() == NULL;
|
|
}
|
|
|
|
private:
|
|
struct barrier
|
|
{
|
|
barrier(boost::shared_ptr<crypto_plugin> plugin, int n)
|
|
: enc_handler(plugin), next(n) {}
|
|
boost::shared_ptr<crypto_plugin> enc_handler;
|
|
// number of bytes to next barrier
|
|
int next;
|
|
};
|
|
std::list<barrier> m_send_barriers;
|
|
boost::shared_ptr<crypto_plugin> m_dec_handler;
|
|
};
|
|
|
|
struct TORRENT_EXTRA_EXPORT rc4_handler : crypto_plugin
|
|
{
|
|
public:
|
|
rc4_handler();
|
|
|
|
// Input keys must be 20 bytes
|
|
void set_incoming_key(unsigned char const* key, int len) TORRENT_OVERRIDE;
|
|
void set_outgoing_key(unsigned char const* key, int len) TORRENT_OVERRIDE;
|
|
|
|
int encrypt(std::vector<boost::asio::mutable_buffer>& buf) TORRENT_OVERRIDE;
|
|
void decrypt(std::vector<boost::asio::mutable_buffer>& buf
|
|
, int& consume
|
|
, int& produce
|
|
, int& packet_size) TORRENT_OVERRIDE;
|
|
|
|
private:
|
|
rc4 m_rc4_incoming;
|
|
rc4 m_rc4_outgoing;
|
|
|
|
// determines whether or not encryption and decryption is enabled
|
|
bool m_encrypt;
|
|
bool m_decrypt;
|
|
};
|
|
|
|
} // namespace libtorrent
|
|
|
|
#endif // TORRENT_PE_CRYPTO_HPP_INCLUDED
|
|
#endif // TORRENT_DISABLE_ENCRYPTION
|
|
|