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