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@ -120,15 +120,15 @@ namespace garlic
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return false;
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}
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uint64_t ECIESX25519AEADRatchetSession::CreateNewSessionTag () const
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std::shared_ptr<RatchetTagSet> ECIESX25519AEADRatchetSession::CreateNewSessionTagset ()
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{
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uint8_t tagsetKey[32];
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i2p::crypto::HKDF (m_CK, nullptr, 0, "SessionReplyTags", tagsetKey, 32); // tagsetKey = HKDF(chainKey, ZEROLEN, "SessionReplyTags", 32)
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// Session Tag Ratchet
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RatchetTagSet tagsetNsr;
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tagsetNsr.DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
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tagsetNsr.NextSessionTagRatchet ();
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return tagsetNsr.GetNextSessionTag ();
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auto tagsetNsr = std::make_shared<RatchetTagSet>(shared_from_this ());
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tagsetNsr->DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
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tagsetNsr->NextSessionTagRatchet ();
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return tagsetNsr;
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}
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bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
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@ -283,7 +283,7 @@ namespace garlic
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m_State = eSessionStateNewSessionSent;
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if (GetOwner ())
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GetOwner ()->AddECIESx25519SessionTag (0, CreateNewSessionTag (), shared_from_this ());
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GetOwner ()->AddECIESx25519SessionNextTag (CreateNewSessionTagset ());
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return true;
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}
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@ -291,7 +291,7 @@ namespace garlic
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bool ECIESX25519AEADRatchetSession::NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
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{
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// we are Bob
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uint64_t tag = CreateNewSessionTag ();
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uint64_t tag = CreateNewSessionTagset ()->GetNextSessionTag ();
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size_t offset = 0;
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memcpy (out + offset, &tag, 8);
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@ -325,10 +325,12 @@ namespace garlic
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uint8_t keydata[64];
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i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
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// k_ab = keydata[0:31], k_ba = keydata[32:63]
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m_ReceiveTagset.DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
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m_ReceiveTagset.NextSessionTagRatchet ();
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m_SendTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
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m_SendTagset.NextSessionTagRatchet ();
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m_ReceiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
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m_ReceiveTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
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m_ReceiveTagset->NextSessionTagRatchet ();
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m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
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m_SendTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
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m_SendTagset->NextSessionTagRatchet ();
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GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
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i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
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// encrypt payload
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@ -392,10 +394,12 @@ namespace garlic
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uint8_t keydata[64];
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i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
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// k_ab = keydata[0:31], k_ba = keydata[32:63]
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m_SendTagset.DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
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m_SendTagset.NextSessionTagRatchet ();
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m_ReceiveTagset.DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
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m_ReceiveTagset.NextSessionTagRatchet ();
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m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
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m_SendTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
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m_SendTagset->NextSessionTagRatchet ();
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m_ReceiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
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m_ReceiveTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
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m_ReceiveTagset->NextSessionTagRatchet ();
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GenerateMoreReceiveTags (GetOwner ()->GetNumTags ());
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i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
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// decrypt payload
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@ -420,14 +424,14 @@ namespace garlic
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bool ECIESX25519AEADRatchetSession::NewExistingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
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{
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uint8_t nonce[12];
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auto index = m_SendTagset.GetNextIndex ();
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auto index = m_SendTagset->GetNextIndex ();
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CreateNonce (index, nonce); // tag's index
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uint64_t tag = m_SendTagset.GetNextSessionTag ();
|
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uint64_t tag = m_SendTagset->GetNextSessionTag ();
|
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memcpy (out, &tag, 8);
|
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// ad = The session tag, 8 bytes
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// ciphertext = ENCRYPT(k, n, payload, ad)
|
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|
|
uint8_t key[32];
|
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m_SendTagset.GetSymmKey (index, key);
|
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m_SendTagset->GetSymmKey (index, key);
|
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if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, out, 8, key, nonce, out + 8, outLen - 8, true)) // encrypt
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{
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LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
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|
@ -443,14 +447,14 @@ namespace garlic
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|
len -= 8; // tag
|
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|
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|
std::vector<uint8_t> payload (len - 16);
|
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|
uint8_t key[32];
|
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|
m_ReceiveTagset.GetSymmKey (index, key);
|
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|
m_ReceiveTagset->GetSymmKey (index, key);
|
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|
|
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");
|
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|
|
|
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;
|
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|
|
|
}
|
|
|
|
@ -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);
|
|
|
|
|
}
|
|
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|
|
|
|
|
|
|
bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)
|
|
|
|
|