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