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/*
* Copyright (C) 2016 Fundación Inria Chile
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_hashes_cmac AES_CMAC
* @ingroup sys_hashes
* @brief Implementation of the AES CMAC hashing function
* @{
*
* @file
* @brief AES_CMAC interface definition
*
* @author José Ignacio Alamos <jose.alamos@inria.cl>
*/
#ifndef HASHES_CMAC_H
#define HASHES_CMAC_H
#include <stdio.h>
#include "crypto/ciphers.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Length of AES_CMAC block in bytes
*/
#define CMAC_BLOCK_SIZE 16
/**
* @brief AES_CMAC calculation context
*/
typedef struct {
/** AES128 context */
cipher_t aes_ctx;
/** auxiliar array for CMAC calculations **/
uint8_t X[CMAC_BLOCK_SIZE];
/** current last block **/
uint8_t M_last[CMAC_BLOCK_SIZE];
/** last byte in last block */
uint32_t M_n;
} cmac_context_t;
/**
* @brief Initialize CMAC message digest context
*
* @param[in] ctx Pointer to the CMAC context to initialize
* @param[in] key Key to be set
* @param[in] key_size Size of the key
*
* @return CIPHER_INIT_SUCCESS if the initialization was successful.
* CIPHER_ERR_INVALID_KEY_SIZE if the key size is not valid.
*/
int cmac_init(cmac_context_t *ctx, const uint8_t *key, uint8_t key_size);
/**
* @brief Update the CMAC context with a portion of the message being hashed
*
* @param[in] ctx Pointer to the CMAC context to update
* @param[in] data Input data
* @param[in] len Length of @p data
*/
void cmac_update(cmac_context_t *ctx, const void *data, size_t len);
/**
* @brief Finalizes the CMAC message digest
*
* @param[in] ctx Pointer to the CMAC context
* @param[out] digest Result location
*/
void cmac_final(cmac_context_t *ctx, void *digest);
#ifdef __cplusplus
}
#endif
#endif /* HASHES_CMAC_H */
/** @} */