SessionKeyGenerator.h

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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 "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