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associate tagset for ECIESx25519 tags

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orignal 2020-04-24 15:46:02 -04:00
parent ad211a63f3
commit ec29597dbd
4 changed files with 49 additions and 38 deletions
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52
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -120,15 +120,15 @@ namespace garlic
return false;
}
uint64_t ECIESX25519AEADRatchetSession::CreateNewSessionTag () const
std::shared_ptr<RatchetTagSet> ECIESX25519AEADRatchetSession::CreateNewSessionTagset ()
{
uint8_t tagsetKey[32];
i2p::crypto::HKDF (m_CK, nullptr, 0, "SessionReplyTags", tagsetKey, 32); // tagsetKey = HKDF(chainKey, ZEROLEN, "SessionReplyTags", 32)
// Session Tag Ratchet
RatchetTagSet tagsetNsr;
tagsetNsr.DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
tagsetNsr.NextSessionTagRatchet ();
return tagsetNsr.GetNextSessionTag ();
auto tagsetNsr = std::make_shared<RatchetTagSet>(shared_from_this ());
tagsetNsr->DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
tagsetNsr->NextSessionTagRatchet ();
return tagsetNsr;
}
bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
@ -283,7 +283,7 @@ namespace garlic
m_State = eSessionStateNewSessionSent;
if (GetOwner ())
GetOwner ()->AddECIESx25519SessionTag (0, CreateNewSessionTag (), shared_from_this ());
GetOwner ()->AddECIESx25519SessionNextTag (CreateNewSessionTagset ());
return true;
}
@ -291,7 +291,7 @@ namespace garlic
bool ECIESX25519AEADRatchetSession::NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
{
// we are Bob
uint64_t tag = CreateNewSessionTag ();
uint64_t tag = CreateNewSessionTagset ()->GetNextSessionTag ();
size_t offset = 0;
memcpy (out + offset, &tag, 8);
@ -325,10 +325,12 @@ namespace garlic
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_ReceiveTagset.DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
m_ReceiveTagset.NextSessionTagRatchet ();
m_SendTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_SendTagset.NextSessionTagRatchet ();
m_ReceiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
m_ReceiveTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
m_ReceiveTagset->NextSessionTagRatchet ();
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 (GetOwner ()->GetNumTags ());
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// encrypt payload
@ -392,10 +394,12 @@ namespace garlic
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_SendTagset.DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
m_SendTagset.NextSessionTagRatchet ();
m_ReceiveTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_ReceiveTagset.NextSessionTagRatchet ();
m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
m_SendTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
m_SendTagset->NextSessionTagRatchet ();
m_ReceiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
m_ReceiveTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
m_ReceiveTagset->NextSessionTagRatchet ();
GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
// decrypt payload
@ -420,14 +424,14 @@ namespace garlic
bool ECIESX25519AEADRatchetSession::NewExistingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
{
uint8_t nonce[12];
auto index = m_SendTagset.GetNextIndex ();
auto index = m_SendTagset->GetNextIndex ();
CreateNonce (index, nonce); // tag's index
uint64_t tag = m_SendTagset.GetNextSessionTag ();
uint64_t tag = m_SendTagset->GetNextSessionTag ();
memcpy (out, &tag, 8);
// ad = The session tag, 8 bytes
// ciphertext = ENCRYPT(k, n, payload, ad)
uint8_t key[32];
m_SendTagset.GetSymmKey (index, key);
m_SendTagset->GetSymmKey (index, key);
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, out, 8, key, nonce, out + 8, outLen - 8, true)) // encrypt
{
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
@ -443,14 +447,14 @@ namespace garlic
len -= 8; // tag
std::vector<uint8_t> payload (len - 16);
uint8_t key[32];
m_ReceiveTagset.GetSymmKey (index, key);
m_ReceiveTagset->GetSymmKey (index, key);
if (!i2p::crypto::AEADChaCha20Poly1305 (buf + 8, len - 16, buf, 8, key, nonce, payload.data (), len - 16, false)) // decrypt
{
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
return false;
}
HandlePayload (payload.data (), len - 16, index);
if (m_ReceiveTagset.GetNextIndex () - index <= GetOwner ()->GetNumTags ()*2/3)
if (m_ReceiveTagset->GetNextIndex () - index <= GetOwner ()->GetNumTags ()*2/3)
GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
return true;
}
@ -532,7 +536,7 @@ namespace garlic
{
// ack request
SetLeaseSetUpdateStatus (eLeaseSetSubmitted);
SetLeaseSetUpdateMsgID (m_SendTagset.GetNextIndex ());
SetLeaseSetUpdateMsgID (m_SendTagset->GetNextIndex ());
SetLeaseSetSubmissionTime (ts);
payloadLen += 4;
}
@ -646,11 +650,7 @@ namespace garlic
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 ());
}
GetOwner ()->AddECIESx25519SessionNextTag (m_ReceiveTagset);
}
bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)