platform_random.c
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/*
* Copyright (C) 2017 Fundacion Inria Chile
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
* @ingroup net
* @file
* @brief Implementation of OpenThread random platform abstraction
*
* @author Jose Ignacio Alamos <jialamos@uc.cl>
* @}
*/
#include <stdint.h>
#include "openthread/platform/random.h"
#include "periph/cpuid.h"
#include "random.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
/* init random */
void ot_random_init(void)
{
#ifdef CPUID_LEN
char cpu_id[CPUID_LEN];
cpuid_get(cpu_id);
uint32_t seed = 0;
for (unsigned i = 0; i < CPUID_LEN; i++) {
seed += cpu_id[i];
}
random_init(seed);
#else
#error "CPU not supported (current CPU doesn't provide CPUID, required for entropy)"
#endif
}
/* OpenThread will call this to get a random number */
uint32_t otPlatRandomGet(void)
{
uint32_t rand_val = random_uint32();
DEBUG("otPlatRandomGet: %i\n", (int) rand_val);
return rand_val;
}