hondacrx
81 lines
2.3 KiB
C#
81 lines
2.3 KiB
C#
/*
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* Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Security.Cryptography;
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namespace Framework.Cryptography
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{
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public sealed class WorldCrypt : IDisposable
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{
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public void Initialize(byte[] key)
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{
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if (IsInitialized)
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throw new InvalidOperationException("PacketCrypt already initialized!");
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_serverEncrypt = new AesGcm(key);
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_clientDecrypt = new AesGcm(key);
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IsInitialized = true;
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}
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public bool Encrypt(ref byte[] data, ref byte[] tag)
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{
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try
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{
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if (IsInitialized)
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_serverEncrypt.Encrypt(BitConverter.GetBytes(_serverCounter).Combine(BitConverter.GetBytes(0x52565253)), data, data, tag);
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++_serverCounter;
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return true;
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}
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catch (CryptographicException)
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{
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return false;
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}
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}
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public bool Decrypt(byte[] data, byte[] tag)
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{
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try
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{
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if (IsInitialized)
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_clientDecrypt.Decrypt(BitConverter.GetBytes(_clientCounter).Combine(BitConverter.GetBytes(0x544E4C43)), data, tag, data);
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++_clientCounter;
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return true;
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}
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catch (CryptographicException)
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{
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return false;
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}
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}
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public void Dispose()
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{
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IsInitialized = false;
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}
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public bool IsInitialized { get; set; }
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AesGcm _serverEncrypt;
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AesGcm _clientDecrypt;
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ulong _clientCounter;
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ulong _serverCounter;
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}
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}
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