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handle ML-KEM section for new session and create for new session reply
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This commit is contained in:
orignal 2025-04-01 20:46:41 -04:00
parent 2280338900
commit 78d97179b8
1 changed files with 74 additions and 12 deletions
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86
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -257,27 +257,66 @@ namespace garlic
if (!GetOwner ()) return false;
// we are Bob
// KDF1
i2p::crypto::InitNoiseIKState (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
if (!i2p::crypto::GetElligator ()->Decode (buf, m_Aepk))
{
LogPrint (eLogError, "Garlic: Can't decode elligator");
return false;
}
buf += 32; len -= 32;
MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
uint64_t n = 0;
uint8_t sharedSecret[32];
if (!GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
bool decrypted = false;
#if OPENSSL_PQ
if (GetOwner ()->SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD))
{
LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
return false;
}
MixKey (sharedSecret);
i2p::crypto::InitNoiseIKStateMLKEM512 (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)); // bpk
MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
if (GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
{
MixKey (sharedSecret);
uint8_t nonce[12], encapsKey[i2p::crypto::MLKEM512_KEY_LENGTH];
CreateNonce (n, nonce);
if (i2p::crypto::AEADChaCha20Poly1305 (buf, i2p::crypto::MLKEM512_KEY_LENGTH,
m_H, 32, m_CK + 32, nonce, encapsKey, i2p::crypto::MLKEM512_KEY_LENGTH , false)) // decrypt
{
decrypted = true; // encaps section has right hash
MixHash (buf, i2p::crypto::MLKEM512_KEY_LENGTH);
n++;
m_PQKeys = std::make_unique<i2p::crypto::MLKEM512Keys>();
m_PQKeys->SetPublicKey (encapsKey);
}
}
}
#endif
if (!decrypted)
{
if (GetOwner ()->SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
{
i2p::crypto::InitNoiseIKState (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
if (!GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
{
LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
return false;
}
MixKey (sharedSecret);
}
else
{
LogPrint (eLogWarning, "Garlic: No supported encryption type");
return false;
}
}
// decrypt flags/static
uint8_t nonce[12], fs[32];
CreateNonce (0, nonce);
CreateNonce (n, nonce);
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 32, m_H, 32, m_CK + 32, nonce, fs, 32, false)) // decrypt
{
LogPrint (eLogWarning, "Garlic: Flags/static section AEAD verification failed ");
@ -291,8 +330,13 @@ namespace garlic
if (isStatic)
{
// static key, fs is apk
SetRemoteStaticKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD, fs); // TODO: actual key type
if (!GetOwner ()->Decrypt (fs, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, apk)
#if OPENSSL_PQ
if (m_PQKeys)
SetRemoteStaticKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD, fs);
else
#endif
SetRemoteStaticKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD, fs);
if (!GetOwner ()->Decrypt (fs, sharedSecret, m_RemoteStaticKeyType)) // x25519(bsk, apk)
{
LogPrint (eLogWarning, "Garlic: Incorrect Alice static key");
return false;
@ -596,7 +640,7 @@ namespace garlic
}
memcpy (m_NSREncodedKey, out + offset, 32); // for possible next NSR
memcpy (m_NSRH, m_H, 32);
offset += 32;
offset += 32;
// KDF for Reply Key Section
MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || bepk)
@ -613,8 +657,26 @@ namespace garlic
return false;
}
MixKey (sharedSecret);
uint8_t nonce[12];
CreateNonce (0, nonce);
#if OPENSSL_PQ
if (m_PQKeys)
{
uint8_t kemCiphertext[i2p::crypto::MLKEM512_CIPHER_TEXT_LENGTH];
m_PQKeys->Encaps (kemCiphertext, sharedSecret);
if (!i2p::crypto::AEADChaCha20Poly1305 (kemCiphertext, i2p::crypto::MLKEM512_CIPHER_TEXT_LENGTH,
m_H, 32, m_CK + 32, nonce, out + offset, i2p::crypto::MLKEM512_CIPHER_TEXT_LENGTH + 16, true)) // encrypt
{
LogPrint (eLogWarning, "Garlic: NSR ML-KEM ciphertext section AEAD encryption failed");
return false;
}
MixHash (out + offset, i2p::crypto::MLKEM512_CIPHER_TEXT_LENGTH + 16);
MixKey (sharedSecret);
offset += i2p::crypto::MLKEM512_CIPHER_TEXT_LENGTH + 16;
}
#endif
// calculate hash for zero length
if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + offset, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
{