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switch to regular ECIES_X25519 crypto if post quantum section if too short in new session message

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orignal
2026-01-26 10:13:10 -05:00
parent 97bbfc3e1d
commit 87cd333255
1 changed files with 12 additions and 18 deletions
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libi2pd/ECIESX25519AEADRatchetSession.cpp
+12 -18
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@@ -297,27 +297,21 @@ namespace garlic
MixKey (sharedSecret);
auto keyLen = i2p::crypto::GetMLKEMPublicKeyLen (cryptoType);
if (keyLen + 16 > len || !keyLen)
if (keyLen + 16 < len && keyLen)
{
LogPrint (eLogWarning, "Garlic: ML-KEM encaps_key section is too short ", len, ". Expected ", keyLen + 16);
return false;
}
std::vector<uint8_t> encapsKey(keyLen);
if (Decrypt (buf, encapsKey.data (), keyLen))
{
decrypted = true; // encaps section has right hash
MixHash (buf, keyLen + 16);
buf += keyLen + 16;
len -= keyLen + 16;
std::vector<uint8_t> encapsKey(keyLen);
if (Decrypt (buf, encapsKey.data (), keyLen))
{
decrypted = true; // encaps section has right hash
MixHash (buf, keyLen + 16);
buf += keyLen + 16;
len -= keyLen + 16;
m_PQKeys = i2p::crypto::CreateMLKEMKeys (cryptoType);
m_PQKeys->SetPublicKey (encapsKey.data ());
}
else
{
LogPrint (eLogWarning, "Garlic: Failed to decrypt ML-KEM encaps_key section");
return false;
m_PQKeys = i2p::crypto::CreateMLKEMKeys (cryptoType);
m_PQKeys->SetPublicKey (encapsKey.data ());
}
}
// if PQ failed it's valid situation meaning regular ECIES_X25519(type 4)
}
}
#endif