nes-proj/arch/cpu/cc2538/dev/cc2538-ccm-star.c

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/*
* Copyright (c) 2015, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup cc2538-ccm-star
* @{
*
* \file
* Implementation of the AES-CCM* driver for the CC2538 SoC
*/
#include "contiki.h"
#include "dev/ccm.h"
#include "dev/cc2538-aes-128.h"
#include "dev/cc2538-ccm-star.h"
#include <stdint.h>
#include <stdio.h>
/*---------------------------------------------------------------------------*/
#define MODULE_NAME "cc2538-ccm-star"
#define CCM_STAR_LEN_LEN (CCM_NONCE_LEN_LEN - CCM_STAR_NONCE_LENGTH)
#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)
{
cc2538_aes_128_driver.set_key(key);
}
/*---------------------------------------------------------------------------*/
static void
aead(const uint8_t *nonce, uint8_t *m, uint8_t m_len, const uint8_t *a,
uint8_t a_len, uint8_t *result, uint8_t mic_len, int forward)
{
uint16_t cdata_len;
uint8_t crypto_enabled, ret;
crypto_enabled = enable_crypto();
if(forward) {
ret = ccm_auth_encrypt_start(CCM_STAR_LEN_LEN, CC2538_AES_128_KEY_AREA,
nonce, a, a_len, m, m_len, m, mic_len, NULL);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: ccm_auth_encrypt_start() error %u\n", MODULE_NAME, ret);
restore_crypto(crypto_enabled);
return;
}
while(!ccm_auth_encrypt_check_status());
ret = ccm_auth_encrypt_get_result(result, mic_len);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: ccm_auth_encrypt_get_result() error %u\n", MODULE_NAME, ret);
}
} else {
cdata_len = m_len + mic_len;
ret = ccm_auth_decrypt_start(CCM_STAR_LEN_LEN, CC2538_AES_128_KEY_AREA,
nonce, a, a_len, m, cdata_len, m, mic_len,
NULL);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: ccm_auth_decrypt_start() error %u\n", MODULE_NAME, ret);
restore_crypto(crypto_enabled);
return;
}
while(!ccm_auth_decrypt_check_status());
ret = ccm_auth_decrypt_get_result(m, cdata_len, result, mic_len);
if(ret != CRYPTO_SUCCESS) {
PRINTF("%s: ccm_auth_decrypt_get_result() error %u\n", MODULE_NAME, ret);
}
}
restore_crypto(crypto_enabled);
}
/*---------------------------------------------------------------------------*/
const struct ccm_star_driver cc2538_ccm_star_driver = {
set_key,
aead
};
/** @} */