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handle ECIESFlag in DatabaseLookup at floodfill

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orignal 2020-04-07 11:40:18 -04:00
parent a9436aa9af
commit 4e1319d874
4 changed files with 54 additions and 5 deletions
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35
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -623,6 +623,41 @@ namespace garlic
CleanupUnconfirmedLeaseSet (ts);
return ts > m_LastActivityTimestamp + ECIESX25519_EXPIRATION_TIMEOUT;
}
std::shared_ptr<I2NPMessage> WrapECIESX25519AEADRatchetMessage (std::shared_ptr<const I2NPMessage> msg, const uint8_t * key, uint64_t tag)
{
auto m = NewI2NPMessage ();
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
uint8_t nonce[12];
memset (nonce, 0, 12); // n = 0
size_t offset = 0;
memcpy (buf + offset, &tag, 8); offset += 8;
auto payload = buf + offset;
uint16_t cloveSize = msg->GetPayloadLength () + 9 + 1;
size_t len = cloveSize + 3;
payload[0] = eECIESx25519BlkGalicClove; // clove type
htobe16buf (payload + 1, cloveSize); // size
payload += 3;
*payload = 0; payload++; // flag and delivery instructions
*payload = msg->GetTypeID (); // I2NP msg type
htobe32buf (payload + 1, msg->GetMsgID ()); // msgID
htobe32buf (payload + 5, msg->GetExpiration ()/1000); // expiration in seconds
memcpy (payload + 9, msg->GetPayload (), msg->GetPayloadLength ());
if (!i2p::crypto::AEADChaCha20Poly1305 (buf + offset, len, buf, 8, key, nonce, buf + offset, len + 16, true)) // encrypt
{
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
return nullptr;
}
offset += len + 16;
htobe32buf (m->GetPayload (), offset);
m->len += offset + 4;
m->FillI2NPMessageHeader (eI2NPGarlic);
return m;
}
}
}