/** * 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: /** * The hash block size as defined for this algorithm. */ const u32bit HASH_BLOCK_SIZE; /** * Get a new object representing the same algorithm as *this */ virtual HashFunction* clone() const = 0; /** * Get the name of this algorithm. * @return the name of this algorithm */ virtual std::string name() const = 0; /** * Reset the internal state of this object. */ virtual void clear() = 0; HashFunction(u32bit hash_len, u32bit block_len = 0) : BufferedComputation(hash_len), HASH_BLOCK_SIZE(block_len) {} virtual ~HashFunction() {} private: HashFunction& operator=(const HashFunction&); }; } #endif