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handle garlic message

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orignal 2013-12-13 20:07:35 -05:00
parent 7f08f782e0
commit 6f1d4f4300
4 changed files with 128 additions and 1 deletions
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105
Garlic.cpp
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@ -5,6 +5,7 @@
#include "ElGamal.h"
#include "RouterContext.h"
#include "Timestamp.h"
#include "Streaming.h"
#include "Garlic.h"
namespace i2p
@ -158,5 +159,109 @@ namespace garlic
}
return ret;
}
void GarlicRouting::HandleGarlicMessage (uint8_t * buf, size_t len)
{
uint32_t length = be32toh (*(uint32_t *)buf);
buf += 4;
std::string sessionTag((const char *)buf, 32);
if (m_SessionTags.count (sessionTag) > 0)
{
// existing session
uint8_t iv[32]; // IV is first 16 bytes
CryptoPP::SHA256().CalculateDigest(iv, buf, 32);
m_Decryption.SetKeyWithIV (m_SessionKey, 32, iv);
m_Decryption.ProcessData(buf + 32, buf + 32, length - 32);
HandleAESBlock (buf + 32, length - 32);
}
else
{
// new session
ElGamalBlock elGamal;
i2p::crypto::ElGamalDecrypt (i2p::context.GetLeaseSetPrivateKey (), buf, (uint8_t *)&elGamal, true);
memcpy (m_SessionKey, elGamal.sessionKey, 32);
uint8_t iv[32]; // IV is first 16 bytes
CryptoPP::SHA256().CalculateDigest(iv, elGamal.preIV, 32);
m_Decryption.SetKeyWithIV (m_SessionKey, 32, iv);
m_Decryption.ProcessData(buf + 514, buf + 514, length - 514);
HandleAESBlock (buf + 514, length - 514);
}
}
void GarlicRouting::HandleAESBlock (uint8_t * buf, size_t len)
{
uint16_t tagCount = be16toh (*(uint16_t *)buf);
buf += 2;
for (int i = 0; i < tagCount; i++)
m_SessionTags.insert (std::string ((const char *)(buf + i*32), 32));
buf += tagCount*32;
uint32_t payloadSize = be32toh (*(uint32_t *)buf);
buf += 4;
buf += 32;// payload hash. TODO: verify it
if (*buf) // session key?
buf += 32; // new session key
buf++; // flag
// payload
HandleGarlicPayload (buf, payloadSize);
}
void GarlicRouting::HandleGarlicPayload (uint8_t * buf, size_t len)
{
int numCloves = buf[0];
LogPrint (numCloves," cloves");
buf++;
for (int i = 0; i < numCloves; i++)
{
// delivery instructions
uint8_t flag = buf[0];
buf++; // flag
if (flag & 0x80) // encrypted?
{
// TODO: implement
LogPrint ("Clove encrypted");
buf += 32;
}
GarlicDeliveryType deliveryType = (GarlicDeliveryType)((flag >> 5) & 0x03);
switch (deliveryType)
{
case eGarlicDeliveryTypeLocal:
LogPrint ("Garlic type local");
i2p::HandleI2NPMessage (buf, len);
break;
case eGarlicDeliveryTypeDestination:
{
LogPrint ("Garlic type destination");
i2p::data::IdentHash destination (buf);
buf += 32;
// we assume streaming protocol for destination
// later on we should let destination decide
I2NPHeader * header = (I2NPHeader *)buf;
if (header->typeID == eI2NPData)
i2p::stream::HandleDataMessage (&destination, buf + sizeof (I2NPHeader), be16toh (header->size));
else
LogPrint ("Unexpected I2NP garlic message ", (int)header->typeID);
break;
}
case eGarlicDeliveryTypeRouter:
LogPrint ("Garlic type router not implemented");
// TODO: implement
buf += 32;
break;
case eGarlicDeliveryTypeTunnel:
LogPrint ("Garlic type tunnel not implemented");
// TODO: implement
buf += 4;
buf += 32;
break;
default:
LogPrint ("Unknow garlic delivery type ", (int)deliveryType);
}
buf += GetI2NPMessageLength (buf); // I2NP
buf += 4; // CloveID
buf += 8; // Date
buf += 3; // Certificate
}
}
}
}