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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/>.
*/
#ifndef TRINITY_SESSIONKEYGENERATOR_HPP
#define TRINITY_SESSIONKEYGENERATOR_HPP
#include <cstring>
#include "CryptoHash.h"
template <typename Hash>
class SessionKeyGenerator
{
public:
template <typename C>
SessionKeyGenerator(C const& buf) :
o0it(o0.begin())
{
uint8 const* data = std::data(buf);
size_t const len = std::size(buf);
size_t const halflen = (len / 2);
o1 = Hash::GetDigestOf(data, halflen);
o2 = Hash::GetDigestOf(data + halflen, len - halflen);
o0 = Hash::GetDigestOf(o1, o0, o2);
}
void Generate(uint8* buf, uint32 sz)
{
for (uint32 i = 0; i < sz; ++i)
{
if (o0it == o0.end())
{
o0 = Hash::GetDigestOf(o1, o0, o2);
o0it = o0.begin();
}
buf[i] = *(o0it++);
}
}
private:
typename Hash::Digest o0 = { };
typename Hash::Digest o1 = { };
typename Hash::Digest o2 = { };
typename Hash::Digest::const_iterator o0it;
};
#endif
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