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92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
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* Copyright (c) 2016, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-cbc-mac
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* @{
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*
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* \file
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* Implementation of the cc2538 AES-CBC-MAC driver
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*/
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#include "contiki.h"
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#include "dev/rom-util.h"
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#include "dev/cbc-mac.h"
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#include <stdbool.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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uint8_t
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cbc_mac_auth_start(uint8_t key_area, const void *mdata, uint16_t mdata_len,
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struct process *process)
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{
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uint32_t ctrl;
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uint32_t iv[AES_IV_LEN / sizeof(uint32_t)];
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/* Program AES-CBC-MAC authentication operation */
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ctrl = AES_AES_CTRL_SAVE_CONTEXT | /* Save context */
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AES_AES_CTRL_CBC_MAC | /* CBC-MAC */
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AES_AES_CTRL_DIRECTION_ENCRYPT; /* Encryption */
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/* Prepare the crypto initialization vector
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* Set initialization vector to 0 */
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rom_util_memset(iv, 0, AES_IV_LEN);
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return aes_auth_crypt_start(ctrl, key_area, iv, NULL, 0,
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mdata, NULL, mdata_len, process);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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cbc_mac_auth_get_result(const void *mac_in, void *mac_out)
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{
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uint32_t tag[AES_TAG_LEN / sizeof(uint32_t)];
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uint8_t ret;
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ret = aes_auth_crypt_get_result(NULL, tag);
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if(ret != CRYPTO_SUCCESS) {
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return ret;
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}
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if(mac_in != NULL) {
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/* Check MAC */
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if(rom_util_memcmp(tag, mac_in, CBC_MAC_MAC_LEN)) {
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ret = AES_AUTHENTICATION_FAILED;
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}
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}
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if(mac_out != NULL) {
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/* Copy tag to MAC */
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rom_util_memcpy(mac_out, tag, CBC_MAC_MAC_LEN);
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}
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return ret;
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}
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/** @} */
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