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check if new tag was created

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orignal 2020-12-26 17:18:29 -05:00
parent b4236b04c6
commit 86ff0d86db
2 changed files with 26 additions and 5 deletions
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18
libi2pd/ECIESX25519AEADRatchetSession.cpp
View File

@ -45,13 +45,13 @@ namespace garlic
uint64_t RatchetTagSet::GetNextSessionTag ()
{
i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), m_SessTagConstant, 32, "SessionTagKeyGen", m_KeyData.buf); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
m_NextIndex++;
if (m_NextIndex >= 65535)
{
LogPrint (eLogError, "Garlic: Tagset ", GetTagSetID (), " is empty");
return 0;
}
i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), m_SessTagConstant, 32, "SessionTagKeyGen", m_KeyData.buf); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
return m_KeyData.GetTag ();
}
@ -687,6 +687,13 @@ namespace garlic
auto index = m_SendTagset->GetNextIndex ();
CreateNonce (index, nonce); // tag's index
uint64_t tag = m_SendTagset->GetNextSessionTag ();
if (!tag)
{
LogPrint (eLogError, "Garlic: can't create new ECIES-X25519-AEAD-Ratchet tag for send tagset");
if (GetOwner ())
GetOwner ()->RemoveECIESx25519Session (m_RemoteStaticKey);
return false;
}
memcpy (out, &tag, 8);
// ad = The session tag, 8 bytes
// ciphertext = ENCRYPT(k, n, payload, ad)
@ -1050,7 +1057,14 @@ namespace garlic
if (GetOwner ())
{
for (int i = 0; i < numTags; i++)
GetOwner ()->AddECIESx25519SessionNextTag (receiveTagset);
{
auto tag = GetOwner ()->AddECIESx25519SessionNextTag (receiveTagset);
if (!tag)
{
LogPrint (eLogError, "Garlic: can't create new ECIES-X25519-AEAD-Ratchet tag for receive tagset");
break;
}
}
}
}

11
libi2pd/Garlic.cpp
View File

@ -546,12 +546,18 @@ namespace garlic
if (!session->HandleNextMessage (buf, length, nullptr, 0))
{
// try to gererate more tags for last tagset
if (m_LastTagset)
if (m_LastTagset && m_LastTagset->GetNextIndex () < 2*ECIESX25519_TAGSET_MAX_NUM_TAGS)
{
auto maxTags = std::max (m_NumRatchetInboundTags, ECIESX25519_MAX_NUM_GENERATED_TAGS);
for (int i = 0; i < maxTags; i++)
{
if (AddECIESx25519SessionNextTag (m_LastTagset) == tag)
auto nextTag = AddECIESx25519SessionNextTag (m_LastTagset);
if (!nextTag)
{
LogPrint (eLogError, "Garlic: can't create new ECIES-X25519-AEAD-Ratchet tag for last tagset");
break;
}
if (nextTag == tag)
{
LogPrint (eLogDebug, "Garlic: Missing ECIES-X25519-AEAD-Ratchet tag was generated");
if (m_LastTagset->HandleNextMessage (buf, length, m_ECIESx25519Tags[tag].index))
@ -1057,6 +1063,7 @@ namespace garlic
{
auto index = tagset->GetNextIndex ();
uint64_t tag = tagset->GetNextSessionTag ();
if (tag)
m_ECIESx25519Tags.emplace (tag, ECIESX25519AEADRatchetIndexTagset{index, tagset});
return tag;
}