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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 <string>
namespace Botan {
/**
* This class represents hash function (message digest) objects.
*/
class BOTAN_DLL HashFunction : public BufferedComputation
{
public:
/**
* @param hash_len the output length
* @param block_len the internal block size (if applicable)
*/
HashFunction(u32bit hash_len) : BufferedComputation(hash_len) {}
virtual ~HashFunction() {}
/**
* Get a new object representing the same algorithm as *this
*/
virtual HashFunction* clone() const = 0;
/**
* Get the name of this algorithm.
* @return name of this algorithm
*/
virtual std::string name() const = 0;
/**
* The hash block size as defined for this algorithm
*/
virtual size_t hash_block_size() const { return 0; }
/**
* Reset the internal state of this object.
*/
virtual void clear() = 0;
private:
HashFunction& operator=(const HashFunction&);
};
}
#endif
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