mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.4 KiB
80 lines
2.4 KiB
/* |
|
* Copyright (c) 2022, The PurpleI2P Project |
|
* |
|
* This file is part of Purple i2pd project and licensed under BSD3 |
|
* |
|
* See full license text in LICENSE file at top of project tree |
|
*/ |
|
|
|
#include <string.h> |
|
#include <openssl/rand.h> |
|
#include "Transports.h" |
|
#include "SSU2.h" |
|
|
|
namespace i2p |
|
{ |
|
namespace transport |
|
{ |
|
SSU2Session::SSU2Session (std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter, |
|
std::shared_ptr<const i2p::data::RouterInfo::Address> addr, bool peerTest): |
|
TransportSession (in_RemoteRouter, SSU2_TERMINATION_TIMEOUT), |
|
m_Address (addr) |
|
{ |
|
m_NoiseState.reset (new i2p::crypto::NoiseSymmetricState); |
|
if (in_RemoteRouter && addr) |
|
{ |
|
// outgoing |
|
InitNoiseXKState1 (*m_NoiseState, addr->s); |
|
} |
|
} |
|
|
|
SSU2Session::~SSU2Session () |
|
{ |
|
} |
|
|
|
void SSU2Session::SendSessionRequest () |
|
{ |
|
m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair (); |
|
m_NoiseState->MixHash (m_EphemeralKeys->GetPublicKey (), 32); |
|
uint8_t sharedSecret[32]; |
|
m_EphemeralKeys->Agree (m_Address->s, sharedSecret); |
|
m_NoiseState->MixKey (sharedSecret); |
|
|
|
Header header; |
|
uint8_t headerX[48], payload[1200]; // TODO: correct payload size |
|
size_t payloadSize = 8; |
|
// fill packet |
|
RAND_bytes (header.h.connID, 8); |
|
memset (header.h.packetNum, 0, 4); |
|
header.h.type = eSSU2SessionRequest; |
|
header.h.flags[0] = 2; // ver |
|
header.h.flags[1] = 2; // netID TODO: |
|
header.h.flags[2] = 0; // flag |
|
RAND_bytes (headerX, 8); // source id |
|
memset (headerX + 8, 0, 8); // token |
|
memcpy (headerX + 16, m_EphemeralKeys->GetPublicKey (), 32); // X |
|
// encrypt |
|
const uint8_t nonce[12] = {0}; |
|
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, m_NoiseState->m_H, 32, m_NoiseState->m_CK + 32, nonce, payload, payloadSize + 16, true); |
|
payloadSize += 16; |
|
CreateHeaderMask (m_Address->i, payload + (payloadSize - 24), m_Address->i, payload + (payloadSize - 12)); |
|
EncryptHeader (header); |
|
i2p::crypto::ChaCha20 (headerX, 48, m_Address->i, nonce, headerX); |
|
|
|
} |
|
|
|
void SSU2Session::EncryptHeader (Header& h) |
|
{ |
|
h.ll[0] ^= m_HeaderMask.ll[0]; |
|
h.ll[1] ^= m_HeaderMask.ll[1]; |
|
} |
|
|
|
void SSU2Session::CreateHeaderMask (const uint8_t * kh1, const uint8_t * nonce1, const uint8_t * kh2, const uint8_t * nonce2) |
|
{ |
|
// Header Encryption KDF |
|
uint8_t data[8] = {0}; |
|
i2p::crypto::ChaCha20 (data, 8, kh1, nonce1, m_HeaderMask.buf); |
|
i2p::crypto::ChaCha20 (data, 8, kh2, nonce2, m_HeaderMask.buf + 8); |
|
} |
|
} |
|
}
|
|
|