contiki/platform/jn516x/dev/ccm-star.c

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2015-09-21 08:57:54 +00:00
/*
* Copyright (c) 2015, SICS Swedish ICT.
* 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.
*
*/
/**
* \file
* CCM* header implementation exploiting the JN516x
* cryptographic co-processor
* \author
* Simon Duquennoy <simonduq@sics.se>
*/
#include "ccm-star.h"
#include <AHI_AES.h>
#include <string.h>
static tsReg128 current_key;
static int current_key_is_new = 1;
/*---------------------------------------------------------------------------*/
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)
{
tsReg128 nonce_aligned;
memcpy(&nonce_aligned, nonce, sizeof(nonce_aligned));
if(forward) {
bACI_CCMstar(
&current_key,
current_key_is_new,
XCV_REG_AES_SET_MODE_CCM,
mic_len,
a_len,
m_len,
&nonce_aligned,
(uint8_t *)a,
(uint8_t *)m,
(uint8_t *)m,
result,
NULL
);
} else {
bool_t auth;
bACI_CCMstar(
&current_key,
current_key_is_new,
XCV_REG_AES_SET_MODE_CCM_D,
mic_len,
a_len,
m_len,
&nonce_aligned,
(uint8_t *)a,
(uint8_t *)m,
(uint8_t *)m,
(uint8_t *)a + a_len + m_len,
&auth
);
/* To comply with the CCM_STAR interface, copy MIC to result in case of success */
if(result != NULL) {
if(auth) {
memcpy(result, a + a_len + m_len, mic_len);
} else {
/* Otherwise, corrupt the result */
memcpy(result, a + a_len + m_len, mic_len);
result[0]++;
}
}
}
current_key_is_new = 0;
}
/*---------------------------------------------------------------------------*/
static void
set_key(const uint8_t *key)
{
if(memcmp(&current_key, key, sizeof(current_key)) == 0) {
current_key_is_new = 0;
} else {
memcpy(&current_key, key, sizeof(current_key));
current_key_is_new = 1;
}
}
/*---------------------------------------------------------------------------*/
const struct ccm_star_driver ccm_star_driver_jn516x = {
set_key,
aead
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};
/*---------------------------------------------------------------------------*/