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initial commit 2019-09-07 14:03:22 +04:00 • committed by vvaltman
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adnl/adnl-proxy-types.cpp Normal file
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/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#include "adnl-proxy-types.hpp"
#include "tl-utils/tl-utils.hpp"
#include "auto/tl/ton_api.hpp"
#include "td/utils/overloaded.h"
#include "td/utils/Time.h"
#include "common/errorcode.h"
namespace ton {
namespace adnl {
td::BufferSlice AdnlProxyFast::encrypt(Packet packet) const {
auto date = static_cast<td::uint32>(td::Clocks::system());
auto signature = create_hash_tl_object<ton_api::adnl_proxyToFastHash>(
packet.ip, packet.port, date, sha256_bits256(packet.data.as_slice()), shared_secret_);
auto obj = create_serialize_tl_object<ton_api::adnl_proxyToFast>(packet.ip, packet.port, date, signature);
td::BufferSlice res{32 + obj.size() + packet.data.size()};
auto S = res.as_slice();
S.copy_from(td::Bits256::zero().as_slice());
S.remove_prefix(32);
S.copy_from(obj.as_slice());
S.remove_prefix(obj.size());
S.copy_from(packet.data.as_slice());
return res;
}
td::Result<AdnlProxy::Packet> AdnlProxyFast::decrypt(td::BufferSlice packet) const {
if (packet.size() < 36) {
return td::Status::Error(ErrorCode::protoviolation, "too short packet");
}
td::Bits256 v;
v.as_slice().copy_from(packet.as_slice().truncate(32));
if (!v.is_zero()) {
return td::Status::Error(ErrorCode::protoviolation, "non-zero DST");
}
packet.confirm_read(32);
TRY_RESULT(R, fetch_tl_prefix<ton_api::adnl_proxyToFast>(packet, true));
if (R->date_ < td::Clocks::system() - 8) {
return td::Status::Error(ErrorCode::protoviolation, "too old date");
}
auto signature = create_hash_tl_object<ton_api::adnl_proxyToFastHash>(
R->ip_, R->port_, R->date_, sha256_bits256(packet.as_slice()), shared_secret_);
if (signature != R->signature_) {
return td::Status::Error(ErrorCode::protoviolation, "bad signature");
}
return Packet{static_cast<td::uint32>(R->ip_), static_cast<td::uint16>(R->port_), std::move(packet)};
}
td::Result<std::shared_ptr<AdnlProxy>> AdnlProxy::create(const ton_api::adnl_Proxy &proxy_type) {
std::shared_ptr<AdnlProxy> R;
ton_api::downcast_call(
const_cast<ton_api::adnl_Proxy &>(proxy_type),
td::overloaded([&](const ton_api::adnl_proxy_none &x) { R = std::make_shared<AdnlProxyNone>(); },
[&](const ton_api::adnl_proxy_fast &x) {
R = std::make_shared<AdnlProxyFast>(x.shared_secret_.as_slice());
}));
return R;
}
} // namespace adnl
} // namespace ton