1 /* SPDX-License-Identifier: Unlicense */
2 #include <sys/types.h>
3 #include <stdlib.h>
4
5 #include <libecc/external_deps/rand.h>
6
7 int
get_random(unsigned char * buf,uint16_t len)8 get_random(unsigned char *buf, uint16_t len)
9 {
10
11 /*
12 * We need random numbers even in a sandbox, so we can't use
13 * /dev/urandom as the external_deps version of get_random() does on
14 * FreeBSD. arc4random_buf() is a better choice because it uses the
15 * underlying getrandom(2) instead of needing to open a device handle.
16 *
17 * We don't have any guarantees that this won't open a device on other
18 * platforms, but we also don't do any sandboxing on those platforms.
19 */
20 arc4random_buf(buf, len);
21 return 0;
22 }
23