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handle next key forward

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orignal 2020-04-24 21:36:08 -04:00
parent ec29597dbd
commit 30067fc7d7
3 changed files with 96 additions and 35 deletions
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30
libi2pd/ECIESX25519AEADRatchetSession.h
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@ -27,10 +27,13 @@ namespace garlic
void DHInitialize (const uint8_t * rootKey, const uint8_t * k);
void NextSessionTagRatchet ();
uint64_t GetNextSessionTag ();
const uint8_t * GetNextRootKey () const { return m_NextRootKey; };
int GetNextIndex () const { return m_NextIndex; };
void GetSymmKey (int index, uint8_t * key);
std::shared_ptr<ECIESX25519AEADRatchetSession> GetSession () { return m_Session.lock (); };
int GetTagSetID () const { return m_TagSetID; };
void SetTagSetID (int tagsetID) { m_TagSetID = tagsetID; };
private:
@ -44,10 +47,11 @@ namespace garlic
uint64_t GetTag () const { return ll[4]; }; // tag = keydata[32:39]
} m_KeyData;
uint8_t m_SessTagConstant[32], m_SymmKeyCK[32], m_CurrentSymmKeyCK[64];
uint8_t m_SessTagConstant[32], m_SymmKeyCK[32], m_CurrentSymmKeyCK[64], m_NextRootKey[32];
int m_NextIndex, m_NextSymmKeyIndex;
std::unordered_map<int, i2p::data::Tag<32> > m_ItermediateSymmKeys;
std::weak_ptr<ECIESX25519AEADRatchetSession> m_Session;
int m_TagSetID = 0;
};
enum ECIESx25519BlockType
@ -56,14 +60,17 @@ namespace garlic
eECIESx25519BlkSessionID = 1,
eECIESx25519BlkTermination = 4,
eECIESx25519BlkOptions = 5,
eECIESx25519BlkNextSessionKey = 7,
eECIESx25519BlkNextKey = 7,
eECIESx25519BlkAck = 8,
eECIESx25519BlkAckRequest = 9,
eECIESx25519BlkGalicClove = 11,
eECIESx25519BlkPadding = 254
};
const uint8_t ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG = 0x01;
const uint8_t ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG = 0x02;
const uint8_t ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG = 0x04;
const int ECIESX25519_RESTART_TIMEOUT = 120; // number of second of inactivity we should restart after
const int ECIESX25519_EXPIRATION_TIMEOUT = 600; // in seconds
@ -83,7 +90,7 @@ namespace garlic
ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSet);
~ECIESX25519AEADRatchetSession ();
bool HandleNextMessage (const uint8_t * buf, size_t len, int index = 0);
bool HandleNextMessage (const uint8_t * buf, size_t len, std::shared_ptr<RatchetTagSet> receiveTagset, int index = 0);
std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg);
const uint8_t * GetRemoteStaticKey () const { return m_RemoteStaticKey; }
@ -107,9 +114,10 @@ namespace garlic
bool HandleNewIncomingSession (const uint8_t * buf, size_t len);
bool HandleNewOutgoingSessionReply (const uint8_t * buf, size_t len);
bool HandleExistingSessionMessage (const uint8_t * buf, size_t len, int index);
void HandlePayload (const uint8_t * buf, size_t len, int index = 0);
bool HandleExistingSessionMessage (const uint8_t * buf, size_t len, std::shared_ptr<RatchetTagSet> receiveTagset, int index);
void HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<RatchetTagSet>& receiveTagset, int index);
void HandleNextKey (const uint8_t * buf, size_t len, const std::shared_ptr<RatchetTagSet>& receiveTagset);
bool NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
bool NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
bool NextNewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
@ -119,7 +127,7 @@ namespace garlic
size_t CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len, bool isDestination = false);
size_t CreateDeliveryStatusClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len);
void GenerateMoreReceiveTags (int numTags);
void GenerateMoreReceiveTags (std::shared_ptr<RatchetTagSet> receiveTagset, int numTags);
private:
@ -129,10 +137,12 @@ namespace garlic
i2p::crypto::X25519Keys m_EphemeralKeys;
SessionState m_State = eSessionStateNew;
uint64_t m_LastActivityTimestamp = 0; // incoming
std::shared_ptr<RatchetTagSet> m_SendTagset, m_ReceiveTagset;
std::shared_ptr<RatchetTagSet> m_SendTagset;
int m_SendKeyID = 0, m_ReceiveKeyID = 0;
std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it
std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)
};
std::list<std::pair<uint16_t, i2p::data::Tag<32> > > m_ReverseKeys; // (keyid, public key)
};
std::shared_ptr<I2NPMessage> WrapECIESX25519AEADRatchetMessage (std::shared_ptr<const I2NPMessage> msg, const uint8_t * key, uint64_t tag);
}