RLPXFrameCoder.h

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/*
 This file is part of cpp-ethereum.
 
 cpp-ethereum 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.
 
 cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include <memory>
#include <libdevcore/Guards.h>
#include <libdevcrypto/ECDHE.h>
#include <libdevcrypto/CryptoPP.h>
#include "Common.h"

namespace dev
{
namespace p2p
{

struct RLPXFrameDecryptFailed: virtual dev::Exception {};

struct RLPXFrameInfo
{
        RLPXFrameInfo() = default;
        RLPXFrameInfo(bytesConstRef _frameHeader);

        uint32_t const length;                  
        uint8_t const padding;                  
        
        bytes const data;                               
        RLP const header;                               
        
        uint16_t const protocolId;              
        bool const multiFrame;                  
        uint16_t const sequenceId;              
        uint32_t const totalLength;             
};

class RLPXHandshake;

class RLPXFrameCoder
{
        friend class RLPXFrameIOMux;
        friend class Session;
public:
        RLPXFrameCoder(RLPXHandshake const& _init);
        
        RLPXFrameCoder(bool _originated, h512 const& _remoteEphemeral, h256 const& _remoteNonce, crypto::ECDHE const& _ephemeral, h256 const& _nonce, bytesConstRef _ackCipher, bytesConstRef _authCipher);
        
        ~RLPXFrameCoder();
        
        void setup(bool _originated, h512 const& _remoteEphemeral, h256 const& _remoteNonce, crypto::ECDHE const& _ephemeral, h256 const& _nonce, bytesConstRef _ackCipher, bytesConstRef _authCipher);
        
        void writeFrame(uint16_t _protocolType, bytesConstRef _payload, bytes& o_bytes);

        void writeFrame(uint16_t _protocolType, uint16_t _seqId, bytesConstRef _payload, bytes& o_bytes);
        
        void writeFrame(uint16_t _protocolType, uint16_t _seqId, uint32_t _totalSize, bytesConstRef _payload, bytes& o_bytes);
        
        void writeSingleFramePacket(bytesConstRef _packet, bytes& o_bytes);

        bool authAndDecryptHeader(bytesRef io_cipherWithMac);
        
        bool authAndDecryptFrame(bytesRef io_cipherWithMac);
        
        h128 egressDigest();

        h128 ingressDigest();

protected:
        void writeFrame(RLPStream const& _header, bytesConstRef _payload, bytes& o_bytes);
        
        void updateEgressMACWithHeader(bytesConstRef _headerCipher);

        void updateEgressMACWithFrame(bytesConstRef _cipher);
        
        void updateIngressMACWithHeader(bytesConstRef _headerCipher);
        
        void updateIngressMACWithFrame(bytesConstRef _cipher);

private:
        std::unique_ptr<class RLPXFrameCoderImpl> m_impl;
};

}
}