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save new session with NSR tagset

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orignal 2020-06-04 18:19:38 -04:00
parent 438a225487
commit 4ae41513ac
2 changed files with 19 additions and 6 deletions
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11
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -150,7 +150,8 @@ namespace garlic
uint8_t tagsetKey[32];
i2p::crypto::HKDF (m_CK, nullptr, 0, "SessionReplyTags", tagsetKey, 32); // tagsetKey = HKDF(chainKey, ZEROLEN, "SessionReplyTags", 32)
// Session Tag Ratchet
auto tagsetNsr = std::make_shared<RatchetTagSet>(shared_from_this ());
auto tagsetNsr = (m_State == eSessionStateNewSessionReceived) ? std::make_shared<RatchetTagSet>(shared_from_this ()):
std::make_shared<NSRatchetTagSet>(shared_from_this ());
tagsetNsr->DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
tagsetNsr->NextSessionTagRatchet ();
return tagsetNsr;
@ -416,8 +417,8 @@ namespace garlic
bool ECIESX25519AEADRatchetSession::NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
{
// we are Bob
m_NSRTagset = CreateNewSessionTagset ();
uint64_t tag = m_NSRTagset->GetNextSessionTag ();
m_NSRSendTagset = CreateNewSessionTagset ();
uint64_t tag = m_NSRSendTagset->GetNextSessionTag ();
size_t offset = 0;
memcpy (out + offset, &tag, 8);
@ -475,7 +476,7 @@ namespace garlic
bool ECIESX25519AEADRatchetSession::NextNewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
{
// we are Bob and sent NSR already
uint64_t tag = m_NSRTagset->GetNextSessionTag (); // next tag
uint64_t tag = m_NSRSendTagset->GetNextSessionTag (); // next tag
memcpy (out, &tag, 8);
memcpy (out + 8, m_NSREncodedKey, 32);
// recalculate h with new tag
@ -625,7 +626,7 @@ namespace garlic
{
case eSessionStateNewSessionReplySent:
m_State = eSessionStateEstablished;
m_NSRTagset = nullptr;
m_NSRSendTagset = nullptr;
#if (__cplusplus >= 201703L) // C++ 17 or higher
[[fallthrough]];
#endif

14
libi2pd/ECIESX25519AEADRatchetSession.h
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@ -79,6 +79,18 @@ namespace garlic
uint64_t m_ExpirationTimestamp = 0;
};
class NSRatchetTagSet: public RatchetTagSet
{
public:
NSRatchetTagSet (std::shared_ptr<ECIESX25519AEADRatchetSession> session):
RatchetTagSet (session), m_DummySession (session) {};
private:
std::shared_ptr<ECIESX25519AEADRatchetSession> m_DummySession; // we need a strong pointer for NS
};
enum ECIESx25519BlockType
{
eECIESx25519BlkDateTime = 0,
@ -171,7 +183,7 @@ namespace garlic
i2p::crypto::X25519Keys m_EphemeralKeys;
SessionState m_State = eSessionStateNew;
uint64_t m_SessionCreatedTimestamp = 0, m_LastActivityTimestamp = 0; // incoming
std::shared_ptr<RatchetTagSet> m_SendTagset, m_NSRTagset;
std::shared_ptr<RatchetTagSet> m_SendTagset, m_NSRSendTagset;
std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it
std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)
bool m_SendReverseKey = false, m_SendForwardKey = false;