esp-idf/components/wpa_supplicant/port/os_xtensa.c

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C
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2016-11-21 14:59:46 +00:00
/*
* wpa_supplicant/hostapd / Internal implementation of OS specific functions
* Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*
* This file is an example of operating system specific wrapper functions.
* This version implements many of the functions internally, so it can be used
* to fill in missing functions from the target system C libraries.
*
* Some of the functions are using standard C library calls in order to keep
* this file in working condition to allow the functions to be tested on a
* Linux target. Please note that OS_NO_C_LIB_DEFINES needs to be defined for
* this file to work correctly. Note that these implementations are only
* examples and are not optimized for speed.
*/
#include "crypto/common.h"
#include "os.h"
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include "esp_system.h"
int os_get_time(struct os_time *t)
{
return gettimeofday((struct timeval*) t, NULL);
}
unsigned long os_random(void)
{
return esp_random();
}
unsigned long r_rand(void) __attribute__((alias("os_random")));
int os_get_random(unsigned char *buf, size_t len)
{
int i, j;
unsigned long tmp;
for (i = 0; i < ((len + 3) & ~3) / 4; i++) {
tmp = r_rand();
for (j = 0; j < 4; j++) {
if ((i * 4 + j) < len) {
buf[i * 4 + j] = (uint8_t)(tmp >> (j * 8));
} else {
break;
}
}
}
return 0;
}