/*
 * 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"

#ifndef RIOT_VERSION

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)
{
    unsigned 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;
}

#endif
