Method SendResponse

src/network/network_crypto.cpp:219–238

* Perform the key exchange, and when that is correct fill the \c Packet with the appropriate data. * @param p The packet that has to be sent. * @param derived_key_extra_payload The extra payload to pass to the key exchange. * @return Whether the key exchange was successful or not. */

 * @return Whether the key exchange was successful or not.
 */
bool X25519AuthenticationHandler::SendResponse(Packet &p, std::string_view derived_key_extra_payload)
{
	if (!this->derived_keys.Exchange(this->peer_public_key, X25519KeyExchangeSide::CLIENT,
			this->our_secret_key, this->our_public_key, derived_key_extra_payload)) {
		Debug(net, 0, "[crypto] Peer sent an illegal public key; authentication aborted.");
		return false;
	}

	X25519KeyExchangeMessage message;
	RandomBytesWithFallback(message);
	X25519Mac mac;

	crypto_aead_lock(message.data(), mac.data(), this->derived_keys.ClientToServer().data(), this->key_exchange_nonce.data(),
			this->our_public_key.data(), this->our_public_key.size(), message.data(), message.size());

	p.Send_bytes(this->our_public_key);
	p.Send_bytes(mac);
	p.Send_bytes(message);
	return true;
}

/**
 * Get the public key the peer provided for the key exchange.