src/basic/random-util.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering
***/

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

int acquire_random_bytes(void *p, size_t n, bool high_quality_required);
void pseudorandom_bytes(void *p, size_t n);
void random_bytes(void *p, size_t n);
void initialize_srand(void);

static inline uint64_t random_u64(void) {
        uint64_t u;
        random_bytes(&u, sizeof(u));
        return u;
}

static inline uint32_t random_u32(void) {
        uint32_t u;
        random_bytes(&u, sizeof(u));
        return u;
}