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crypto.ratchet.inboundTags

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orignal 2020-06-12 20:42:54 -04:00
parent 5e0a8ed232
commit 61897ae16c
6 changed files with 35 additions and 9 deletions
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31
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -341,7 +341,8 @@ namespace garlic
newTagset->SetTagSetID (tagsetID);
newTagset->DHInitialize (receiveTagset->GetNextRootKey (), tagsetKey);
newTagset->NextSessionTagRatchet ();
GenerateMoreReceiveTags (newTagset, ECIESX25519_MAX_NUM_GENERATED_TAGS);
GenerateMoreReceiveTags (newTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MAX_NUM_GENERATED_TAGS);
receiveTagset->Expire ();
LogPrint (eLogDebug, "Garlic: next receive tagset ", tagsetID, " created");
}
@ -459,7 +460,8 @@ namespace garlic
m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
m_SendTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_SendTagset->NextSessionTagRatchet ();
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_MIN_NUM_GENERATED_TAGS);
GenerateMoreReceiveTags (receiveTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MIN_NUM_GENERATED_TAGS);
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// encrypt payload
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + offset, len + 16, true)) // encrypt
@ -548,7 +550,8 @@ namespace garlic
auto receiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
receiveTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
receiveTagset->NextSessionTagRatchet ();
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_MIN_NUM_GENERATED_TAGS);
GenerateMoreReceiveTags (receiveTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MIN_NUM_GENERATED_TAGS);
}
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// decrypt payload
@ -610,11 +613,23 @@ namespace garlic
return false;
}
HandlePayload (payload, len - 16, receiveTagset, index);
int moreTags = ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 2); // N/4
if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
moreTags -= (receiveTagset->GetNextIndex () - index);
if (moreTags > 0 && GetOwner ())
GenerateMoreReceiveTags (receiveTagset, moreTags);
if (GetOwner ())
{
int moreTags = 0;
if (GetOwner ()->GetNumRatchetInboundTags () > 0) // override in settings?
{
if (receiveTagset->GetNextIndex () - index < GetOwner ()->GetNumRatchetInboundTags ()/2)
moreTags = GetOwner ()->GetNumRatchetInboundTags ();
}
else
{
moreTags = ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 2); // N/4
if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
moreTags -= (receiveTagset->GetNextIndex () - index);
}
if (moreTags > 0)
GenerateMoreReceiveTags (receiveTagset, moreTags);
}
return true;
}