osd-contiki/cpu/cc2538/dev/cc2538-aes-128.c

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2015-10-21 10:18:04 +02:00
/*
* Copyright (c) 2015, Hasso-Plattner-Institut.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
* \addtogroup cc2538-aes-128
* @{
*
* \file
* Implementation of the AES-128 driver for the CC2538 SoC
* \author
* Konrad Krentz <konrad.krentz@gmail.com>
*/
#include "contiki.h"
#include "dev/ecb.h"
#include "dev/cc2538-aes-128.h"
#include <stdint.h>
#include <stdio.h>
/*---------------------------------------------------------------------------*/
#define MODULE_NAME "cc2538-aes-128"
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static uint8_t
enable_crypto(void)
{
uint8_t enabled = CRYPTO_IS_ENABLED();
if(!enabled) {
crypto_enable();
}
return enabled;
}
/*---------------------------------------------------------------------------*/
static void
restore_crypto(uint8_t enabled)
{
if(!enabled) {
crypto_disable();
}
}
/*---------------------------------------------------------------------------*/
static void
set_key(const uint8_t *key)
{
uint8_t crypto_enabled, ret;
crypto_enabled = enable_crypto();
ret = aes_load_keys(key, AES_KEY_STORE_SIZE_KEY_SIZE_128, 1,
CC2538_AES_128_KEY_AREA);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: aes_load_keys() error %u\n", MODULE_NAME, ret);
}
restore_crypto(crypto_enabled);
}
/*---------------------------------------------------------------------------*/
static void
encrypt(uint8_t *plaintext_and_result)
{
uint8_t crypto_enabled, ret;
int8_t res;
crypto_enabled = enable_crypto();
ret = ecb_crypt_start(true, CC2538_AES_128_KEY_AREA, plaintext_and_result,
plaintext_and_result, AES_128_BLOCK_SIZE, NULL);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: ecb_crypt_start() error %u\n", MODULE_NAME, ret);
restore_crypto(crypto_enabled);
return;
}
while((res = ecb_crypt_check_status()) == CRYPTO_PENDING);
if(res != CRYPTO_SUCCESS) {
PRINTF("%s: ecb_crypt_check_status() error %d\n", MODULE_NAME, res);
}
restore_crypto(crypto_enabled);
}
/*---------------------------------------------------------------------------*/
const struct aes_128_driver cc2538_aes_128_driver = {
set_key,
encrypt
};
/** @} */