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/*
* MDx Hash Function
* (C) 1999-2008 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MDX_BASE_H_
#define BOTAN_MDX_BASE_H_
#include <botan/hash.h>
BOTAN_FUTURE_INTERNAL_HEADER(mdx_hash.h)
namespace Botan {
/**
* MDx Hash Function Base Class
*/
class BOTAN_PUBLIC_API(2,0) MDx_HashFunction : public HashFunction
{
public:
/**
* @param block_length is the number of bytes per block, which must
* be a power of 2 and at least 8.
* @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,
uint8_t counter_size = 8);
size_t hash_block_size() const override final { return m_buffer.size(); }
protected:
void add_data(const uint8_t input[], size_t length) override final;
void final_result(uint8_t output[]) override final;
/**
* 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 uint8_t blocks[], size_t block_n) = 0;
void clear() override;
/**
* Copy the output to the buffer
* @param buffer to put the output into
*/
virtual void copy_out(uint8_t buffer[]) = 0;
/**
* Write the count, if used, to this spot
* @param out where to write the counter to
*/
virtual void write_count(uint8_t out[]);
private:
const uint8_t m_pad_char;
const uint8_t m_counter_size;
const uint8_t m_block_bits;
const bool m_count_big_endian;
uint64_t m_count;
secure_vector<uint8_t> m_buffer;
size_t m_position;
};
}
#endif
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