tdesktop/Telegram/SourceFiles/mtproto/details/mtproto_dc_key_binder.cpp

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "mtproto/details/mtproto_dc_key_binder.h"
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#include "mtproto/details/mtproto_serialized_request.h"
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#include "mtproto/mtp_instance.h"
#include "base/unixtime.h"
#include "base/openssl_help.h"
#include "base/random.h"
#include "scheme.h"
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#include <QtCore/QPointer>
namespace MTP::details {
namespace {
[[nodiscard]] QByteArray EncryptBindAuthKeyInner(
const AuthKeyPtr &persistentKey,
mtpMsgId realMsgId,
const MTPBindAuthKeyInner &data) {
auto serialized = SerializedRequest::Serialize(data);
serialized.setMsgId(realMsgId);
serialized.setSeqNo(0);
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serialized.addPadding(true);
constexpr auto kMsgIdPosition = SerializedRequest::kMessageIdPosition;
constexpr auto kMinMessageSize = 5;
const auto sizeInPrimes = serialized->size();
const auto messageSize = serialized.messageSize();
Assert(messageSize >= kMinMessageSize);
Assert(sizeInPrimes >= kMsgIdPosition + messageSize);
const auto sizeInBytes = sizeInPrimes * sizeof(mtpPrime);
const auto padding = sizeInBytes
- (kMsgIdPosition + messageSize) * sizeof(mtpPrime);
// session_id, salt - just random here.
bytes::set_random(bytes::make_span(*serialized).subspan(
0,
kMsgIdPosition * sizeof(mtpPrime)));
const auto hash = openssl::Sha1(bytes::make_span(*serialized).subspan(
0,
sizeInBytes - padding));
auto msgKey = MTPint128();
bytes::copy(
bytes::object_as_span(&msgKey),
bytes::make_span(hash).subspan(4));
constexpr auto kAuthKeyIdBytes = 2 * sizeof(mtpPrime);
constexpr auto kMessageKeyPosition = kAuthKeyIdBytes;
constexpr auto kMessageKeyBytes = 4 * sizeof(mtpPrime);
constexpr auto kPrefix = (kAuthKeyIdBytes + kMessageKeyBytes);
auto encrypted = QByteArray(kPrefix + sizeInBytes, Qt::Uninitialized);
*reinterpret_cast<uint64*>(encrypted.data()) = persistentKey->keyId();
*reinterpret_cast<MTPint128*>(encrypted.data() + kMessageKeyPosition)
= msgKey;
aesIgeEncrypt_oldmtp(
serialized->constData(),
encrypted.data() + kPrefix,
sizeInBytes,
persistentKey,
msgKey);
return encrypted;
}
} // namespace
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DcKeyBinder::DcKeyBinder(AuthKeyPtr &&persistentKey)
: _persistentKey(std::move(persistentKey)) {
Expects(_persistentKey != nullptr);
}
SerializedRequest DcKeyBinder::prepareRequest(
const AuthKeyPtr &temporaryKey,
uint64 sessionId) {
Expects(temporaryKey != nullptr);
Expects(temporaryKey->expiresAt() != 0);
const auto nonce = base::RandomValue<uint64>();
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const auto msgId = base::unixtime::mtproto_msg_id();
auto result = SerializedRequest::Serialize(MTPauth_BindTempAuthKey(
MTP_long(_persistentKey->keyId()),
MTP_long(nonce),
MTP_int(temporaryKey->expiresAt()),
MTP_bytes(EncryptBindAuthKeyInner(
_persistentKey,
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msgId,
MTP_bind_auth_key_inner(
MTP_long(nonce),
MTP_long(temporaryKey->keyId()),
MTP_long(_persistentKey->keyId()),
MTP_long(sessionId),
MTP_int(temporaryKey->expiresAt()))))));
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result.setMsgId(msgId);
return result;
}
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DcKeyBindState DcKeyBinder::handleResponse(const mtpBuffer &response) {
Expects(!response.isEmpty());
auto from = response.data();
const auto end = from + response.size();
auto error = MTPRpcError();
if (response[0] == mtpc_boolTrue) {
return DcKeyBindState::Success;
} else if (response[0] == mtpc_rpc_error && error.read(from, end)) {
const auto destroyed = error.match([&](const MTPDrpc_error &data) {
return (data.verror_code().v == 400)
&& (data.verror_message().v == "ENCRYPTED_MESSAGE_INVALID");
});
return destroyed
? DcKeyBindState::DefinitelyDestroyed
: DcKeyBindState::Failed;
} else {
return DcKeyBindState::Failed;
}
}
AuthKeyPtr DcKeyBinder::persistentKey() const {
return _persistentKey;
}
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} // namespace MTP::details