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indetification of incoming garlic messages

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orignal 2020-04-13 20:00:19 -04:00
parent 152e579f7e
commit 2fc16ee13d
6 changed files with 30 additions and 25 deletions
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24
libi2pd/Garlic.cpp
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@ -466,8 +466,9 @@ namespace garlic
LogPrint (eLogWarning, "Garlic: message length ", length, " exceeds I2NP message length ", msg->GetLength ());
return;
}
auto mod = length & 0x0f; // %16
buf += 4; // length
auto it = m_Tags.find (SessionTag(buf));
auto it = !mod ? m_Tags.find (SessionTag(buf)) : m_Tags.end (); // AES block is multiple of 16
// AES tag might be used even if encryption type is not ElGamal/AES
if (it != m_Tags.end ())
{
@ -487,15 +488,11 @@ namespace garlic
}
else
{
// tag not found. Handle depending on encryption type
if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET))
{
HandleECIESx25519 (buf, length);
return;
}
// otherwise assume ElGamal/AES
// AES tag not found. Handle depending on encryption type
// try ElGamal/AES first if leading block is 514
ElGamalBlock elGamal;
if (length >= 514 && Decrypt (buf, (uint8_t *)&elGamal, m_Ctx, i2p::data::CRYPTO_KEY_TYPE_ELGAMAL))
if (mod == 2 && length >= 514 && SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ELGAMAL) &&
Decrypt (buf, (uint8_t *)&elGamal, m_Ctx, i2p::data::CRYPTO_KEY_TYPE_ELGAMAL))
{
auto decryption = std::make_shared<AESDecryption>(elGamal.sessionKey);
uint8_t iv[32]; // IV is first 16 bytes
@ -504,8 +501,11 @@ namespace garlic
decryption->Decrypt(buf + 514, length - 514, buf + 514);
HandleAESBlock (buf + 514, length - 514, decryption, msg->from);
}
else if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET))
// otherwise ECIESx25519
HandleECIESx25519 (buf, length); // TODO: check tag first
else
LogPrint (eLogError, "Garlic: Failed to decrypt message");
LogPrint (eLogError, "Garlic: Failed to decrypt message");
}
}
@ -679,8 +679,8 @@ namespace garlic
std::shared_ptr<GarlicRoutingSession> GarlicDestination::GetRoutingSession (
std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet)
{
if (destination->GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET &&
SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET))
if (destination->GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET &&
SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET))
{
ECIESX25519AEADRatchetSessionPtr session;
uint8_t staticKey[32];