/**
 * \file
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 *
 * \brief MD2 Message-Digest algorithm.
 *
 * The algorithm takes as input a message of arbitrary length and produces
 * as output a 128-bit message digest of the input.
 * It is conjectured that it is computationally infeasible to produce
 * two messages having the same message digest, or to produce any
 * message having a given prespecified target message digest.
 *
 *
 * \author Daniele Basile <asterix@develer.com>
 *
 * $WIZ$ module_name = "md2"
 * $WIZ$ module_configuration = "bertos/cfg/cfg_md2.h"
 */

#ifndef ALGO_MD2_H
#define ALGO_MD2_H

#include "cfg/cfg_md2.h"
#include <cfg/compiler.h>

#define NUM_COMPUTE_ROUNDS 18                           ///< Number of compute rounds.
#define COMPUTE_ARRAY_LEN  CONFIG_MD2_BLOCK_LEN * 3     ///< Lenght of compute array.
#define MD2_DIGEST_LEN CONFIG_MD2_BLOCK_LEN
/**
 * Context for MD2 computation.
 */
typedef struct Md2Context
{
	uint8_t buffer[CONFIG_MD2_BLOCK_LEN];   ///< Input buffer.
	uint8_t state[CONFIG_MD2_BLOCK_LEN];    ///< Current state buffer.
	uint8_t checksum[CONFIG_MD2_BLOCK_LEN]; ///< Checksum.
	size_t counter;                         ///< Counter of remaining bytes.

} Md2Context;

void md2_init(Md2Context *context);
void md2_update(Md2Context *context, const void *block_in, size_t block_len);
uint8_t *md2_end(Md2Context *context);
bool md2_test(void);

#endif /* ALGO_MD2_H */