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/*
* Hash Function Base Class
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/

#ifndef BOTAN_HASH_FUNCTION_BASE_CLASS_H__
#define BOTAN_HASH_FUNCTION_BASE_CLASS_H__

#include <botan/buf_comp.h>
#include <botan/algo_base.h>
#include <string>

namespace Botan {

/**
* This class represents hash function (message digest) objects
*/
class BOTAN_DLL HashFunction : public Buffered_Computation,
                               public Algorithm
   {
   public:
      /**
      * Get a new object representing the same algorithm as *this
      */
      virtual HashFunction* clone() const = 0;

      /**
      * The hash block size as defined for this algorithm
      */
      virtual size_t hash_block_size() const { return 0; }
   };

}

#endif