tdlight/td/mtproto/Handshake.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/mtproto/AuthKey.h"
#include "td/mtproto/crypto.h"
#include "td/mtproto/DhHandshake.h"
#include "td/utils/buffer.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StorerBase.h"
#include "td/utils/UInt.h"
namespace td {
namespace mtproto {
class AuthKeyHandshakeContext {
public:
virtual ~AuthKeyHandshakeContext() = default;
virtual DhCallback *get_dh_callback() = 0;
virtual PublicRsaKeyInterface *get_public_rsa_key_interface() = 0;
};
class AuthKeyHandshake {
public:
class Callback {
public:
Callback() = default;
Callback(const Callback &) = delete;
Callback &operator=(const Callback &) = delete;
virtual ~Callback() = default;
virtual void send_no_crypto(const Storer &storer) = 0;
};
using Context = AuthKeyHandshakeContext;
enum class Mode { Unknown, Main, Temp };
AuthKey auth_key;
double server_time_diff = 0;
uint64 server_salt = 0;
bool is_ready_for_start();
Status start_main(Callback *connection) TD_WARN_UNUSED_RESULT;
Status start_tmp(Callback *connection, int32 expires_in) TD_WARN_UNUSED_RESULT;
bool is_ready_for_message(const UInt128 &message_nonce);
bool is_ready_for_finish();
void on_finish();
AuthKeyHandshake(int32 dc_id, int32 expires_in) {
dc_id_ = dc_id;
if (expires_in == 0) {
mode_ = Mode::Main;
} else {
mode_ = Mode::Temp;
expires_in_ = expires_in;
}
}
void init_main() {
clear();
mode_ = Mode::Main;
}
void init_temp(int32 expires_in) {
clear();
mode_ = Mode::Temp;
expires_in_ = expires_in;
}
void resume(Callback *connection);
Status on_message(Slice message, Callback *connection, Context *context) TD_WARN_UNUSED_RESULT;
bool is_ready() {
return is_ready_for_finish();
}
void clear();
private:
using State = enum { Start, ResPQ, ServerDHParams, DHGenResponse, Finish };
State state_ = Start;
Mode mode_ = Mode::Unknown;
int32 dc_id_ = 0;
int32 expires_in_ = 0;
double expires_at_ = 0;
UInt128 nonce;
UInt128 server_nonce;
UInt256 new_nonce;
UInt256 tmp_aes_key;
UInt256 tmp_aes_iv;
BufferSlice last_query_;
template <class DataT>
Result<size_t> fill_data_with_hash(uint8 *data_with_hash, const DataT &data) TD_WARN_UNUSED_RESULT;
void send(Callback *connection, const Storer &storer);
void do_send(Callback *connection, const Storer &storer);
Status on_start(Callback *connection) TD_WARN_UNUSED_RESULT;
Status on_res_pq(Slice message, Callback *connection, PublicRsaKeyInterface *public_rsa_key) TD_WARN_UNUSED_RESULT;
Status on_server_dh_params(Slice message, Callback *connection, DhCallback *dh_callback) TD_WARN_UNUSED_RESULT;
Status on_dh_gen_response(Slice message, Callback *connection) TD_WARN_UNUSED_RESULT;
};
} // namespace mtproto
} // namespace td