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/*
* MDx Hash Function
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MDX_BASE_H__
#define BOTAN_MDX_BASE_H__
#include <botan/hash.h>
namespace Botan {
/**
* MDx Hash Function Base Class
*/
class BOTAN_DLL MDx_HashFunction : public HashFunction
{
public:
/**
* @param hash_length is the output length of this hash
* @param block_length is the number of bytes per block
* @param big_byte_endian specifies if the hash uses big-endian bytes
* @param big_bit_endian specifies if the hash uses big-endian bits
* @param counter_size specifies the size of the counter var in bytes
*/
MDx_HashFunction(size_t block_length,
bool big_byte_endian,
bool big_bit_endian,
size_t counter_size = 8);
size_t hash_block_size() const { return buffer.size(); }
virtual ~MDx_HashFunction() {}
protected:
void add_data(const byte input[], size_t length);
void final_result(byte output[]);
/**
* Run the hash's compression function over a set of blocks
* @param blocks the input
* @param block_n the number of blocks
*/
virtual void compress_n(const byte blocks[], size_t block_n) = 0;
void clear();
/**
* Copy the output to the buffer
* @param buffer to put the output into
*/
virtual void copy_out(byte buffer[]) = 0;
/**
* Write the count, if used, to this spot
* @param out where to write the counter to
*/
virtual void write_count(byte out[]);
private:
SecureVector<byte> buffer;
u64bit count;
size_t position;
const bool BIG_BYTE_ENDIAN, BIG_BIT_ENDIAN;
const size_t COUNT_SIZE;
};
}
#endif
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