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/*
* Copyright (C) 2008-2017 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
*
* 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/>.
*/
#ifndef SessionKeyGeneration_h__
#define SessionKeyGeneration_h__
#include "Define.h"
#include <cstring>
template<class Hash>
class SessionKeyGenerator
{
public:
SessionKeyGenerator(uint8* buff, uint32 size)
{
uint32 halfSize = size / 2;
sh.Initialize();
sh.UpdateData(buff, halfSize);
sh.Finalize();
memcpy(o1, sh.GetDigest(), Hash::DigestLength::value);
sh.Initialize();
sh.UpdateData(buff + halfSize, size - halfSize);
sh.Finalize();
memcpy(o2, sh.GetDigest(), Hash::DigestLength::value);
memset(o0, 0x00, Hash::DigestLength::value);
FillUp();
}
void Generate(uint8* buf, uint32 sz)
{
for (uint32 i = 0; i < sz; ++i)
{
if (taken == Hash::DigestLength::value)
FillUp();
buf[i] = o0[taken];
taken++;
}
}
private:
void FillUp()
{
sh.Initialize();
sh.UpdateData(o1, Hash::DigestLength::value);
sh.UpdateData(o0, Hash::DigestLength::value);
sh.UpdateData(o2, Hash::DigestLength::value);
sh.Finalize();
memcpy(o0, sh.GetDigest(), Hash::DigestLength::value);
taken = 0;
}
Hash sh;
uint32 taken;
uint8 o0[Hash::DigestLength::value];
uint8 o1[Hash::DigestLength::value];
uint8 o2[Hash::DigestLength::value];
};
#endif // SessionKeyGeneration_h__
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