text: /*
   * Copyright (C) 2008-2018 TrinityCore <https://www.trinitycore.org/>
   * Copyright (C) 2005-2009 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 _AUTH_HMAC_H
  #define _AUTH_HMAC_H
  
  #include <string>
  #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 UpdateData(std::string const& str);
  	void UpdateData(uint8 const* data, size_t len);
  	void Finalize();
  	uint8* ComputeHash(BigNumber* bn);
  	uint8* GetDigest() { return m_digest; }
  	int GetLength() const { return SHA_DIGEST_LENGTH; }
  private:
  	HMAC_CTX * m_ctx;
  	uint8 m_digest[SHA_DIGEST_LENGTH];
  };
  #endif
  