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moteid.c
1/*
2 * Copyright (c) 2006, Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the Institute nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include "dev/moteid.h"
32#include "lib/simEnvChange.h"
33#include "lib/random.h"
34#include "lib/csprng.h"
35#include "lib/sha-256.h"
36#include <string.h>
37
38// COOJA variables
39int simMoteID;
40char simMoteIDChanged;
41int simRandomSeed;
42
43/*-----------------------------------------------------------------------------------*/
44static void
45doInterfaceActionsBeforeTick(void)
46{
47 if (simMoteIDChanged) {
49
50 simMoteIDChanged = 0;
51 random_init(simRandomSeed);
52
53 sha_256_hkdf(NULL, 0,
54 (const uint8_t *)&simRandomSeed, sizeof(simRandomSeed),
55 NULL, 0,
56 csprng_seed.u8, sizeof(csprng_seed.u8));
58 }
59}
60/*-----------------------------------------------------------------------------------*/
61COOJA_PRE_TICK_ACTION(COOJA_MOTEID_INIT_PRIO, doInterfaceActionsBeforeTick);
An OFB-AES-128-based CSPRNG.
void random_init(unsigned short seed)
Seed the cc2538 random number generator.
Definition random.c:84
void csprng_feed(struct csprng_seed *new_seed)
Mixes a new seed with the current one.
Definition csprng.c:61
Platform-independent SHA-256 API.
This is the structure of a seed.
Definition csprng.h:76
uint8_t u8[(AES_128_KEY_LENGTH+AES_128_BLOCK_SIZE)]
for convenience
Definition csprng.h:83