esp-idf/components/newlib/random.c

36 lines
896 B
C
Raw Normal View History

/*
* SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
2018-07-31 08:49:54 -04:00
#include <sys/random.h>
#include <sys/param.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "esp_random.h"
2018-07-31 08:49:54 -04:00
#include "esp_log.h"
static const char *TAG = "RANDOM";
ssize_t getrandom(void *buf, size_t buflen, unsigned int flags)
{
// Flags are ignored because:
// - esp_random is non-blocking so it works for both blocking and non-blocking calls,
// - don't have opportunity so set som other source of entropy.
ESP_LOGD(TAG, "getrandom(buf=0x%x, buflen=%d, flags=%u)", (int) buf, buflen, flags);
if (buf == NULL) {
errno = EFAULT;
ESP_LOGD(TAG, "getrandom returns -1 (EFAULT)");
return -1;
}
esp_fill_random(buf, buflen);
2018-07-31 08:49:54 -04:00
ESP_LOGD(TAG, "getrandom returns %d", buflen);
return buflen;
2018-07-31 08:49:54 -04:00
}