119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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* Copyright (c) 2015, Hasso-Plattner-Institut.
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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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \addtogroup cc2538-aes-128
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* @{
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*
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* \file
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* Implementation of the AES-128 driver for the CC2538 SoC
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* \author
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* Konrad Krentz <konrad.krentz@gmail.com>
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*/
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#include "contiki.h"
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#include "dev/ecb.h"
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#include "dev/cc2538-aes-128.h"
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#include <stdint.h>
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#include <stdio.h>
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/*---------------------------------------------------------------------------*/
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#define MODULE_NAME "cc2538-aes-128"
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static uint8_t
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enable_crypto(void)
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{
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uint8_t enabled = CRYPTO_IS_ENABLED();
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if(!enabled) {
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crypto_enable();
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}
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return enabled;
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}
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/*---------------------------------------------------------------------------*/
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static void
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restore_crypto(uint8_t enabled)
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{
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if(!enabled) {
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crypto_disable();
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_key(const uint8_t *key)
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{
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uint8_t crypto_enabled, ret;
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crypto_enabled = enable_crypto();
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ret = aes_load_keys(key, AES_KEY_STORE_SIZE_KEY_SIZE_128, 1,
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CC2538_AES_128_KEY_AREA);
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if(ret != CRYPTO_SUCCESS) {
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PRINTF("%s: aes_load_keys() error %u\n", MODULE_NAME, ret);
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}
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restore_crypto(crypto_enabled);
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}
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/*---------------------------------------------------------------------------*/
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static void
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encrypt(uint8_t *plaintext_and_result)
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{
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uint8_t crypto_enabled, ret;
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int8_t res;
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crypto_enabled = enable_crypto();
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ret = ecb_crypt_start(true, CC2538_AES_128_KEY_AREA, plaintext_and_result,
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plaintext_and_result, AES_128_BLOCK_SIZE, NULL);
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if(ret != CRYPTO_SUCCESS) {
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PRINTF("%s: ecb_crypt_start() error %u\n", MODULE_NAME, ret);
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restore_crypto(crypto_enabled);
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return;
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}
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while((res = ecb_crypt_check_status()) == CRYPTO_PENDING);
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if(res != CRYPTO_SUCCESS) {
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PRINTF("%s: ecb_crypt_check_status() error %d\n", MODULE_NAME, res);
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}
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restore_crypto(crypto_enabled);
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}
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/*---------------------------------------------------------------------------*/
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const struct aes_128_driver cc2538_aes_128_driver = {
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set_key,
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encrypt
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};
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/** @} */
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