mirror of https://github.com/aria2/aria2
182 lines
4.6 KiB
C++
182 lines
4.6 KiB
C++
/* <!-- copyright */
|
|
/*
|
|
* aria2 - The high speed download utility
|
|
*
|
|
* Copyright (C) 2006 Tatsuhiro Tsujikawa
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* In addition, as a special exception, the copyright holders give
|
|
* permission to link the code of portions of this program with the
|
|
* OpenSSL library under certain conditions as described in each
|
|
* individual source file, and distribute linked combinations
|
|
* including the two.
|
|
* You must obey the GNU General Public License in all respects
|
|
* for all of the code used other than OpenSSL. If you modify
|
|
* file(s) with this exception, you may extend this exception to your
|
|
* version of the file(s), but you are not obligated to do so. If you
|
|
* do not wish to do so, delete this exception statement from your
|
|
* version. If you delete this exception statement from all source
|
|
* files in the program, then also delete it here.
|
|
*/
|
|
/* copyright --> */
|
|
#ifndef _D_MSE_HANDSHAKE_H_
|
|
#define _D_MSE_HANDSHAKE_H_
|
|
|
|
#include "common.h"
|
|
#include "SharedHandle.h"
|
|
#include "BtConstants.h"
|
|
|
|
namespace aria2 {
|
|
|
|
class Option;
|
|
class Logger;
|
|
class SocketCore;
|
|
class DHKeyExchange;
|
|
class ARC4Encryptor;
|
|
class ARC4Decryptor;
|
|
|
|
class MSEHandshake {
|
|
public:
|
|
enum HANDSHAKE_TYPE {
|
|
HANDSHAKE_NOT_YET = 0,
|
|
HANDSHAKE_LEGACY,
|
|
HANDSHAKE_ENCRYPTED
|
|
};
|
|
|
|
enum CRYPTO_TYPE {
|
|
CRYPTO_NONE = 0,
|
|
CRYPTO_PLAIN_TEXT = 0x01,
|
|
CRYPTO_ARC4 = 0x02
|
|
};
|
|
|
|
private:
|
|
static const size_t PRIME_BITS = 768;
|
|
|
|
static const size_t KEY_LENGTH = (PRIME_BITS+7)/8;
|
|
|
|
static const size_t MAX_PAD_LENGTH = 512;
|
|
|
|
static const size_t VC_LENGTH = 8;
|
|
|
|
static const size_t CRYPTO_BITFIELD_LENGTH = 4;
|
|
|
|
static const size_t MAX_BUFFER_LENGTH = 6*1024;
|
|
|
|
int32_t _cuid;
|
|
SharedHandle<SocketCore> _socket;
|
|
const Option* _option;
|
|
Logger* _logger;
|
|
|
|
unsigned char _rbuf[MAX_BUFFER_LENGTH];
|
|
size_t _rbufLength;
|
|
|
|
CRYPTO_TYPE _negotiatedCryptoType;
|
|
DHKeyExchange* _dh;
|
|
SharedHandle<ARC4Encryptor> _encryptor;
|
|
SharedHandle<ARC4Decryptor> _decryptor;
|
|
unsigned char _infoHash[INFO_HASH_LENGTH];
|
|
unsigned char _secret[KEY_LENGTH];
|
|
bool _initiator;
|
|
unsigned char _initiatorVCMarker[VC_LENGTH];
|
|
size_t _markerIndex;
|
|
uint16_t _padLength;
|
|
uint16_t _iaLength;
|
|
unsigned char* _ia;
|
|
|
|
static const unsigned char* PRIME;
|
|
|
|
static const unsigned char* GENERATOR;
|
|
|
|
static const unsigned char VC[VC_LENGTH];
|
|
|
|
void encryptAndSendData(const unsigned char* data, size_t length);
|
|
|
|
void createReq1Hash(unsigned char* md) const;
|
|
|
|
void createReq23Hash(unsigned char* md, const unsigned char* infoHash) const;
|
|
|
|
uint16_t decodeLength16(const unsigned char* buffer);
|
|
|
|
uint16_t decodeLength16(const char* buffer)
|
|
{
|
|
return decodeLength16(reinterpret_cast<const unsigned char*>(buffer));
|
|
}
|
|
|
|
uint16_t verifyPadLength(const unsigned char* padlenbuf,
|
|
const std::string& padName);
|
|
|
|
void verifyVC(const unsigned char* vcbuf);
|
|
|
|
void verifyReq1Hash(const unsigned char* req1buf);
|
|
|
|
size_t receiveNBytes(size_t bytes);
|
|
|
|
public:
|
|
MSEHandshake(int32_t cuid, const SharedHandle<SocketCore>& socket,
|
|
const Option* op);
|
|
|
|
~MSEHandshake();
|
|
|
|
HANDSHAKE_TYPE identifyHandshakeType();
|
|
|
|
void initEncryptionFacility(bool initiator);
|
|
|
|
void sendPublicKey();
|
|
|
|
bool receivePublicKey();
|
|
|
|
void initCipher(const unsigned char* infoHash);
|
|
|
|
void sendInitiatorStep2();
|
|
|
|
bool findInitiatorVCMarker();
|
|
|
|
bool receiveInitiatorCryptoSelectAndPadDLength();
|
|
|
|
bool receivePad();
|
|
|
|
bool findReceiverHashMarker();
|
|
|
|
bool receiveReceiverHashAndPadCLength();
|
|
|
|
bool receiveReceiverIALength();
|
|
|
|
bool receiveReceiverIA();
|
|
|
|
void sendReceiverStep2();
|
|
|
|
// returns plain text IA
|
|
const unsigned char* getIA() const;
|
|
|
|
size_t getIALength() const;
|
|
|
|
const unsigned char* getInfoHash() const;
|
|
|
|
CRYPTO_TYPE getNegotiatedCryptoType() const;
|
|
|
|
SharedHandle<ARC4Encryptor> getEncryptor() const;
|
|
|
|
SharedHandle<ARC4Decryptor> getDecryptor() const;
|
|
|
|
const unsigned char* getBuffer() const;
|
|
|
|
size_t getBufferLength() const;
|
|
};
|
|
|
|
} // namespace aria2
|
|
|
|
#endif // _D_MSE_HANDSHAKE_H_
|