mirror of
https://github.com/PurpleI2P/i2pd
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105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
#ifndef GARLIC_H__
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#define GARLIC_H__
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#include <inttypes.h>
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#include <map>
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#include <string>
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#include <cryptopp/modes.h>
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#include <cryptopp/aes.h>
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#include <cryptopp/osrng.h>
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#include "I2NPProtocol.h"
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#include "LeaseSet.h"
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namespace i2p
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{
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namespace garlic
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{
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enum GarlicDeliveryType
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{
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eGarlicDeliveryTypeLocal = 0,
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eGarlicDeliveryTypeDestination = 1,
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eGarlicDeliveryTypeRouter = 2,
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eGarlicDeliveryTypeTunnel = 3
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};
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#pragma pack(1)
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struct ElGamalBlock
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{
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uint8_t sessionKey[32];
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uint8_t preIV[32];
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uint8_t padding[158];
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};
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#pragma pack()
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class GarlicRoutingSession
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{
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public:
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GarlicRoutingSession (const i2p::data::RoutingDestination& destination, int numTags);
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~GarlicRoutingSession ();
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I2NPMessage * WrapSingleMessage (I2NPMessage * msg, I2NPMessage * leaseSet);
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int GetNextTag () const { return m_NextTag; };
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uint32_t GetFirstMsgID () const { return m_FirstMsgID; };
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bool IsAcknowledged () const { return m_IsAcknowledged; };
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void SetAcknowledged (bool acknowledged) { m_IsAcknowledged = acknowledged; };
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private:
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size_t CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet);
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size_t CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet);
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size_t CreateGarlicClove (uint8_t * buf, I2NPMessage * msg, bool isDestination);
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size_t CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID);
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void GenerateSessionTags ();
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private:
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const i2p::data::RoutingDestination& m_Destination;
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uint8_t m_SessionKey[32];
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uint32_t m_FirstMsgID; // first message ID
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bool m_IsAcknowledged;
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int m_NumTags, m_NextTag;
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uint8_t * m_SessionTags; // m_NumTags*32 bytes
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CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
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CryptoPP::AutoSeededRandomPool m_Rnd;
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};
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class GarlicRouting
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{
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public:
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GarlicRouting ();
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~GarlicRouting ();
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void HandleGarlicMessage (uint8_t * buf, size_t len, bool isFromTunnel);
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void HandleDeliveryStatusMessage (uint8_t * buf, size_t len);
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I2NPMessage * WrapSingleMessage (const i2p::data::RoutingDestination& destination, I2NPMessage * msg);
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I2NPMessage * WrapMessage (const i2p::data::RoutingDestination& destination,
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I2NPMessage * msg, I2NPMessage * leaseSet = nullptr);
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private:
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void HandleAESBlock (uint8_t * buf, size_t len, uint8_t * sessionKey);
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void HandleGarlicPayload (uint8_t * buf, size_t len);
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private:
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// outgoing sessions
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std::map<i2p::data::IdentHash, GarlicRoutingSession *> m_Sessions;
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std::map<uint32_t, GarlicRoutingSession *> m_CreatedSessions; // msgID -> session
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// incoming session
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std::map<std::string, std::string> m_SessionTags; // tag -> key
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CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;
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};
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extern GarlicRouting routing;
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}
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}
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#endif
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