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handle new session reply

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orignal 2020-01-29 12:54:26 -05:00
parent abe668f1c3
commit a1dbec0fcb
3 changed files with 56 additions and 13 deletions
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47
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -137,6 +137,7 @@ namespace garlic
}
if (isStatic) MixHash (buf, len); // h = SHA256(h || ciphertext)
m_State = eSessionStateNewSessionReceived;
GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
HandlePayload (payload.data (), len - 16, handleClove);
@ -273,8 +274,52 @@ namespace garlic
bool ECIESX25519AEADRatchetSession::NewOutgoingSessionReply (const uint8_t * buf, size_t len, CloveHandler handleClove)
{
// TODO
// we are Alice
LogPrint (eLogDebug, "Garlic: reply received");
const uint8_t * tag = buf;
buf += 8; len -= 8; // tag
uint8_t bepk[32]; // Bob's ephemeral key
if (!i2p::crypto::GetElligator ()->Decode (buf, bepk))
{
LogPrint (eLogError, "Garlic: Can't decode elligator");
return false;
}
buf += 32; len -= 32;
// KDF for Reply Key Section
MixHash (tag, 8); // h = SHA256(h || tag)
MixHash (bepk, 32); // h = SHA256(h || bepk)
uint8_t sharedSecret[32];
m_EphemeralKeys.Agree (bepk, sharedSecret); // sharedSecret = x25519(aesk, bepk)
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
uint8_t nonce[12];
memset (nonce, 0, 12); // n = 0
// calulate hash for zero length
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 0, m_H, 32, m_CK + 32, nonce, sharedSecret/* can be anyting */, 0, false)) // decrypt, DECRYPT(k, n, ZEROLEN, ad) verification only
{
LogPrint (eLogWarning, "Garlic: Reply key section AEAD decryption failed");
return false;
}
MixHash (buf, 16); // h = SHA256(h || ciphertext)
buf += 16; len -= 16;
// KDF for payload
uint8_t keydata[64];
i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
// k_ab = keydata[0:31], k_ba = keydata[32:63]
m_TagsetAB.DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
m_TagsetBA.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// decrypt payload
std::vector<uint8_t> payload (len - 16);
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, keydata, nonce, payload.data (), len - 16, false)) // decrypt
{
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
return false;
}
// TODO: change state
GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
HandlePayload (payload.data (), len - 16, handleClove);
return true;
}

21
libi2pd/Garlic.cpp
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@ -869,23 +869,14 @@ namespace garlic
{
// TODO
auto session = it->second;
if (session->NewOutgoingSessionReply (buf, len, handleClove))
m_ECIESx25519Sessions.emplace (session->GetRemoteStaticKey (), session);
else
{
if (!session->NewOutgoingSessionReply (buf, len, handleClove))
LogPrint (eLogError, "Garlic: can't decrypt ECIES-X25519-AEAD-Ratchet new session reply");
m_ECIESx25519Tags.erase (tag);
m_ECIESx25519Sessions.erase (session->GetRemoteStaticKey ());
}
m_ECIESx25519Tags.erase (tag);
}
else
{
auto session = std::make_shared<ECIESX25519AEADRatchetSession> (this);
if (session->NewIncomingSession (buf, len, handleClove))
{
m_ECIESx25519Sessions.emplace (session->GetRemoteStaticKey (), session);
}
else
if (!session->NewIncomingSession (buf, len, handleClove))
LogPrint (eLogError, "Garlic: can't decrypt ECIES-X25519-AEAD-Ratchet new session");
}
}
@ -950,5 +941,11 @@ namespace garlic
{
m_ECIESx25519Tags.emplace (tag, session);
}
void GarlicDestination::AddECIESx25519Session (const uint8_t * staticKey, ECIESX25519AEADRatchetSessionPtr session)
{
m_ECIESx25519Sessions.emplace (staticKey, session);
}
}
}

1
libi2pd/Garlic.h
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@ -218,6 +218,7 @@ namespace garlic
virtual bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag); // from different thread
void DeliveryStatusSent (ElGamalAESSessionPtr session, uint32_t msgID);
void AddECIESx25519SessionTag (uint64_t tag, ECIESX25519AEADRatchetSessionPtr session);
void AddECIESx25519Session (const uint8_t * staticKey, ECIESX25519AEADRatchetSessionPtr session);
virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
virtual void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);