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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "WorldPacketCrypt.h"
#include <array>
#include <cstring>
WorldPacketCrypt::WorldPacketCrypt() : _clientDecrypt(false, 256), _serverEncrypt(true, 256), _clientCounter(0), _serverCounter(0), _initialized(false)
{
}
void WorldPacketCrypt::Init(Key const& key)
{
_clientDecrypt.Init(key);
_serverEncrypt.Init(key);
_initialized = true;
}
struct WorldPacketCryptIV
{
WorldPacketCryptIV(uint64 counter, uint32 magic)
{
memcpy(Value.data(), &counter, sizeof(uint64));
memcpy(Value.data() + sizeof(uint64), &magic, sizeof(uint32));
}
std::array<uint8, 12> Value;
};
bool WorldPacketCrypt::PeekDecryptRecv(uint8* data, size_t length)
{
if (_initialized)
{
WorldPacketCryptIV iv{ _clientCounter, 0x544E4C43 };
if (!_clientDecrypt.ProcessNoIntegrityCheck(iv.Value, data, length))
return false;
}
return true;
}
bool WorldPacketCrypt::DecryptRecv(uint8* data, size_t length, Trinity::Crypto::AES::Tag& tag)
{
if (_initialized)
{
WorldPacketCryptIV iv{ _clientCounter, 0x544E4C43 };
if (!_clientDecrypt.Process(iv.Value, data, length, tag))
return false;
}
else
memset(tag, 0, sizeof(tag));
++_clientCounter;
return true;
}
bool WorldPacketCrypt::EncryptSend(uint8* data, size_t length, Trinity::Crypto::AES::Tag& tag)
{
if (_initialized)
{
WorldPacketCryptIV iv{ _serverCounter, 0x52565253 };
if (!_serverEncrypt.Process(iv.Value, data, length, tag))
return false;
}
else
memset(tag, 0, sizeof(tag));
++_serverCounter;
return true;
}
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