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generate more receive tags when needed

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orignal 2020-02-09 17:19:42 -05:00
parent 694d851cdb
commit 53a6162b0c
2 changed files with 21 additions and 16 deletions
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32
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -295,13 +295,7 @@ namespace garlic
m_ReceiveTagset.NextSessionTagRatchet ();
m_SendTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_SendTagset.NextSessionTagRatchet ();
auto numTags = GetOwner ()->GetNumTags ();
for (int i = 0; i < numTags; i++)
{
auto index = m_ReceiveTagset.GetNextIndex ();
uint64_t tag = m_ReceiveTagset.GetNextSessionTag ();
GetOwner ()->AddECIESx25519SessionTag (index, tag, shared_from_this ());
}
GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// encrypt payload
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, keydata, nonce, out + offset, len + 16, true)) // encrypt
@ -310,7 +304,7 @@ namespace garlic
return false;
}
m_State = eSessionStateEstablished;
return true;
}
@ -353,13 +347,7 @@ namespace garlic
m_SendTagset.NextSessionTagRatchet ();
m_ReceiveTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_ReceiveTagset.NextSessionTagRatchet ();
auto numTags = GetOwner ()->GetNumTags ();
for (int i = 0; i < numTags; i++)
{
auto index = m_ReceiveTagset.GetNextIndex ();
uint64_t tag = m_ReceiveTagset.GetNextSessionTag ();
GetOwner ()->AddECIESx25519SessionTag (index, tag, shared_from_this ());
}
GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
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);
@ -405,6 +393,9 @@ namespace garlic
return false;
}
HandlePayload (payload.data (), len - 16);
if (m_NumReceiveTags > 0)m_NumReceiveTags--;
if (m_NumReceiveTags <= GetOwner ()->GetNumTags ()*2/3)
GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
return true;
}
@ -513,6 +504,17 @@ namespace garlic
memcpy (buf + 9, msg->GetPayload (), msg->GetPayloadLength ());
return cloveSize + 3;
}
void ECIESX25519AEADRatchetSession::GenerateMoreReceiveTags (int numTags)
{
for (int i = 0; i < numTags; i++)
{
auto index = m_ReceiveTagset.GetNextIndex ();
uint64_t tag = m_ReceiveTagset.GetNextSessionTag ();
GetOwner ()->AddECIESx25519SessionTag (index, tag, shared_from_this ());
}
m_NumReceiveTags += numTags;
}
}
}