i2pd/Garlic.h

95 lines
2.2 KiB
C++

#ifndef GARLIC_H__
#define GARLIC_H__
#include <inttypes.h>
#include <map>
#include <set>
#include <string>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include <cryptopp/osrng.h>
#include "I2NPProtocol.h"
#include "LeaseSet.h"
namespace i2p
{
namespace garlic
{
enum GarlicDeliveryType
{
eGarlicDeliveryTypeLocal = 0,
eGarlicDeliveryTypeDestination = 1,
eGarlicDeliveryTypeRouter = 2,
eGarlicDeliveryTypeTunnel = 3
};
#pragma pack(1)
struct ElGamalBlock
{
uint8_t sessionKey[32];
uint8_t preIV[32];
uint8_t padding[158];
};
#pragma pack()
class GarlicRoutingSession
{
public:
GarlicRoutingSession (const i2p::data::RoutingDestination * destination, int numTags);
~GarlicRoutingSession ();
I2NPMessage * WrapSingleMessage (I2NPMessage * msg, I2NPMessage * leaseSet);
int GetNumRemainingSessionTags () const { return m_NumTags - m_NextTag; };
private:
size_t CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet);
size_t CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet);
size_t CreateGarlicClove (uint8_t * buf, I2NPMessage * msg, bool isDestination);
private:
const i2p::data::RoutingDestination * m_Destination;
uint8_t m_SessionKey[32];
int m_NumTags, m_NextTag;
uint8_t * m_SessionTags; // m_NumTags*32 bytes
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
CryptoPP::AutoSeededRandomPool m_Rnd;
};
class GarlicRouting
{
public:
GarlicRouting ();
~GarlicRouting ();
void HandleGarlicMessage (uint8_t * buf, size_t len, bool isFromTunnel);
I2NPMessage * WrapSingleMessage (const i2p::data::RoutingDestination * destination,
I2NPMessage * msg, I2NPMessage * leaseSet = nullptr);
private:
void HandleAESBlock (uint8_t * buf, size_t len);
void HandleGarlicPayload (uint8_t * buf, size_t len);
private:
// outgoing sessions
std::map<i2p::data::IdentHash, GarlicRoutingSession *> m_Sessions;
// incoming session
uint8_t m_SessionKey[32];
std::set<std::string> m_SessionTags;
CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;
};
extern GarlicRouting routing;
}
}
#endif