mirror of
https://github.com/espressif/esp-idf.git
synced 2025-11-04 06:11:06 +00:00
31 lines
476 B
C
31 lines
476 B
C
/*
|
|
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <sys/random.h>
|
|
#include <errno.h>
|
|
|
|
int getentropy(void *buffer, size_t length)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (buffer == NULL) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
|
|
if (length > 256) {
|
|
errno = EIO;
|
|
return -1;
|
|
}
|
|
|
|
ret = getrandom(buffer, length, 0);
|
|
if (ret == -1) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|