/*
 * Copyright (C) 
 * Copyright (C) 
 *
 * 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/>.
 */

#include "SHA1.h"

#ifndef _WARDEN_KEY_GENERATION_H
#define _WARDEN_KEY_GENERATION_H

class SHA1Randx
{
public:
    SHA1Randx(uint8* buff, uint32 size)
    {
        uint32 taken = size/2;

        sh.Initialize();
        sh.UpdateData(buff, taken);
        sh.Finalize();

        memcpy(o1, sh.GetDigest(), 20);

        sh.Initialize();
        sh.UpdateData(buff + taken, size - taken);
        sh.Finalize();

        memcpy(o2, sh.GetDigest(), 20);

        memset(o0, 0x00, 20);

        FillUp();
    }

    void Generate(uint8* buf, uint32 sz)
    {
        for (uint32 i = 0; i < sz; ++i)
        {
            if (taken == 20)
                FillUp();

            buf[i] = o0[taken];
            taken++;
        }
    }

private:
    void FillUp()
    {
        sh.Initialize();
        sh.UpdateData(o1, 20);
        sh.UpdateData(o0, 20);
        sh.UpdateData(o2, 20);
        sh.Finalize();

        memcpy(o0, sh.GetDigest(), 20);

        taken = 0;
    }

    SHA1Hash sh;
    uint32 taken;
    uint8 o0[20], o1[20], o2[20];
};

#endif
