/*
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * Copyright (C) 2008-2010 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
 */

#ifndef _AUTH_HMAC_H
#define _AUTH_HMAC_H

#include "Common.h"
#include <openssl/hmac.h>
#include <openssl/sha.h>

class BigNumber;

#define SEED_KEY_SIZE 16

class HmacHash
{
    public:
        HmacHash(uint32 len, uint8 *seed);
        ~HmacHash();
        void UpdateBigNumber(BigNumber *bn);
        void UpdateData(const uint8 *data, int length);
        void UpdateData(const std::string &str);
        void Finalize();
        uint8 *ComputeHash(BigNumber *bn);
        uint8 *GetDigest() { return (uint8*)m_digest; }
        int GetLength() { return SHA_DIGEST_LENGTH; }
    private:
        HMAC_CTX m_ctx;
        uint8 m_digest[SHA_DIGEST_LENGTH];
};
#endif