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/*
* Copyright (C) 2005-2009 MaNGOS <http://www.mangosproject.org/>
*
* Copyright (C) 2008-2009 Trinity <http://www.trinitycore.org/>
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "AuthCrypt.h"
#include "Hmac.h"
AuthCrypt::AuthCrypt()
{
_initialized = false;
}
void AuthCrypt::Init()
{
_send_i = _send_j = _recv_i = _recv_j = 0;
_initialized = true;
}
void AuthCrypt::DecryptRecv(uint8 *data, size_t len)
{
if (!_initialized) return;
if (len < CRYPTED_RECV_LEN) return;
for (size_t t = 0; t < CRYPTED_RECV_LEN; t++)
{
_recv_i %= _key.size();
uint8 x = (data[t] - _recv_j) ^ _key[_recv_i];
++_recv_i;
_recv_j = data[t];
data[t] = x;
}
}
void AuthCrypt::EncryptSend(uint8 *data, size_t len)
{
if (!_initialized) return;
for (size_t t = 0; t < len; t++)
{
_send_i %= _key.size();
uint8 x = (data[t] ^ _key[_send_i]) + _send_j;
++_send_i;
data[t] = _send_j = x;
}
}
void AuthCrypt::SetKey(BigNumber *bn)
{
uint8 *key = new uint8[SHA_DIGEST_LENGTH];
GenerateKey(key, bn);
_key.resize(SHA_DIGEST_LENGTH);
std::copy(key, key + SHA_DIGEST_LENGTH, _key.begin());
delete[] key;
}
AuthCrypt::~AuthCrypt()
{
}
void AuthCrypt::GenerateKey(uint8 *key, BigNumber *bn)
{
HmacHash hash;
hash.UpdateBigNumber(bn);
hash.Finalize();
memcpy(key, hash.GetDigest(), SHA_DIGEST_LENGTH);
}
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