nabstracthash.h

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// LICENSE: (Please see the file COPYING for details)
//
// NUS - Nemesis Utilities System: A C++ application development framework 
// Copyright (C) 2006, 2008 Otavio Rodolfo Piske
//
//  This file is part of NUS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation version 2.1
//  of the License.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
#ifndef NABSTRACTHASH_H
#define NABSTRACTHASH_H

#include <exception>
#include <new>
#include <openssl/evp.h>

#include "ndefs.h"
#include "nobject.h"
#include "nhash.h"
#include "nstring.h"
#include "ndatastream.h"

class NFile;

class DllDeclSpec NAbstractHash: public NObject {
      public:
            NAbstractHash(void);
            
            virtual ~NAbstractHash(void);
            
            virtual NHash calculate(const NString &str) = 0;
            
            virtual NHash calculate(const NDataStream &data, nint32 size) = 0;
            
            virtual NHash calculateFile(const NString &filename) = 0;
            
            virtual NHash calculateFile(NFile *file) = 0;
            
            bool match(const NString &str, const NString &hash);
      
            bool match(const NString &str, const NHash &hash);
            
            bool match(NFile *file, const NString &hash);
            
            bool match(NFile *file, const NHash &hash);
            
      protected:
            void init(const NString &hash_name);
            
            int update(const void *data, int bytes);
            
            NString cleanup(void);
            
            void setHashBufferSize(int size);
            
            int getHashBufferSize(void) const;
      
      private:
            EVP_MD_CTX m_digest_context;
            const EVP_MD *m_message_digest;
            int m_total;
            int m_hash_buffer_size;
            
            NAbstractHash(const NAbstractHash &other);
            NAbstractHash &operator=(const NAbstractHash &rhs);
            
            char *p_cleanup(void);
};

#endif // NABSTRACTHASH_H

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