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80 lines
2 KiB
C++
80 lines
2 KiB
C++
/*
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* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "AuthCrypt.h"
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#include "Hmac.h"
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AuthCrypt::AuthCrypt()
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{
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_initialized = false;
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}
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void AuthCrypt::Init()
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{
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_send_i = _send_j = _recv_i = _recv_j = 0;
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_initialized = true;
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}
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void AuthCrypt::DecryptRecv(uint8 *data, size_t len)
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{
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if (!_initialized) return;
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if (len < CRYPTED_RECV_LEN) return;
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for (size_t t = 0; t < CRYPTED_RECV_LEN; t++)
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{
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_recv_i %= _key.size();
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uint8 x = (data[t] - _recv_j) ^ _key[_recv_i];
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++_recv_i;
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_recv_j = data[t];
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data[t] = x;
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}
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}
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void AuthCrypt::EncryptSend(uint8 *data, size_t len)
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{
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if (!_initialized) return;
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for (size_t t = 0; t < len; t++)
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{
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_send_i %= _key.size();
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uint8 x = (data[t] ^ _key[_send_i]) + _send_j;
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++_send_i;
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data[t] = _send_j = x;
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}
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}
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void AuthCrypt::SetKey(BigNumber *bn)
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{
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uint8 *key = new uint8[SHA_DIGEST_LENGTH];
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GenerateKey(key, bn);
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_key.resize(SHA_DIGEST_LENGTH);
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std::copy(key, key + SHA_DIGEST_LENGTH, _key.begin());
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delete key;
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}
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AuthCrypt::~AuthCrypt()
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{
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}
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void AuthCrypt::GenerateKey(uint8 *key, BigNumber *bn)
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{
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HmacHash hash;
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hash.UpdateBigNumber(bn);
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hash.Finalize();
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memcpy(key, hash.GetDigest(), SHA_DIGEST_LENGTH);
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}
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