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create and encrypt SessionRequest

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orignal 2022-02-11 19:21:04 -05:00
parent 73e572b66b
commit 510fe43ec4
2 changed files with 49 additions and 13 deletions
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36
libi2pd/SSU2.cpp
View File

@ -6,6 +6,8 @@
* 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"
@ -37,22 +39,34 @@ namespace transport
uint8_t sharedSecret[32];
m_EphemeralKeys->Agree (m_Address->s, sharedSecret);
m_NoiseState->MixKey (sharedSecret);
uint8_t packet[1200]; // TODO: correct packet size
size_t packetSize = 64;
Header header;
uint8_t headerX[48], payload[1200]; // TODO: correct payload size
size_t payloadSize = 8;
// fill packet
memcpy (packet + 32, m_EphemeralKeys->GetPublicKey (), 32); // X
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
CreateHeaderMask (m_Address->i, packet + (packetSize - 24), m_Address->i, packet + (packetSize - 12));
EncryptHeader (*(i2p::crypto::ChipherBlock *)packet);
uint8_t nonce[12] = {0};
i2p::crypto::ChaCha20 (packet + 16, 48, m_Address->i, nonce, packet + 16);
i2p::crypto::AEADChaCha20Poly1305 (packet + 64, packetSize - 64, m_NoiseState->m_H, 32, m_NoiseState->m_CK, nonce, packet + 64, packetSize - 48, true);
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 (i2p::crypto::ChipherBlock& header)
void SSU2Session::EncryptHeader (Header& h)
{
header ^= m_HeaderMask;
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)

26
libi2pd/SSU2.h
View File

@ -19,9 +19,27 @@ namespace i2p
namespace transport
{
const int SSU2_TERMINATION_TIMEOUT = 330; // 5.5 minutes
enum SSU2MessageType
{
eSSU2SessionRequest = 0
};
class SSU2Session: public TransportSession, public std::enable_shared_from_this<SSU2Session>
{
union Header
{
uint64_t ll[2];
uint8_t buf[16];
struct
{
uint8_t connID[8];
uint8_t packetNum[4];
uint8_t type;
uint8_t flags[3];
} h;
};
public:
SSU2Session (std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr,
@ -31,7 +49,7 @@ namespace transport
private:
void SendSessionRequest ();
void EncryptHeader (i2p::crypto::ChipherBlock& header);
void EncryptHeader (Header& h);
void CreateHeaderMask (const uint8_t * kh1, const uint8_t * nonce1, const uint8_t * kh2, const uint8_t * nonce2);
private:
@ -40,7 +58,11 @@ namespace transport
std::unique_ptr<i2p::crypto::NoiseSymmetricState> m_NoiseState;
std::shared_ptr<const i2p::data::RouterInfo::Address> m_Address;
i2p::crypto::ChipherBlock m_HeaderMask;
union
{
uint64_t ll[2];
uint8_t buf[16];
} m_HeaderMask;
};
}
}