blob: 1e30d0c87d51b8b90c1d2796beddea61a510a0bf (
plain)
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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#pragma once
#include <inttypes.h>
#include <stdlib.h>
#include <isc/lang.h>
#include <isc/types.h>
/*! \file isc/random.h
* \brief Implements wrapper around a non-cryptographically secure
* pseudo-random number generator.
*
*/
ISC_LANG_BEGINDECLS
uint8_t
isc_random8(void);
/*!<
* \brief Returns a single 8-bit random value.
*/
uint16_t
isc_random16(void);
/*!<
* \brief Returns a single 16-bit random value.
*/
uint32_t
isc_random32(void);
/*!<
* \brief Returns a single 32-bit random value.
*/
void
isc_random_buf(void *buf, size_t buflen);
/*!<
* \brief Fills the region buf of length buflen with random data.
*/
uint32_t
isc_random_uniform(uint32_t upper_bound);
/*!<
* \brief Will return a single 32-bit value, uniformly distributed but
* less than upper_bound. This is recommended over
* constructions like ``isc_random() % upper_bound'' as it
* avoids "modulo bias" when the upper bound is not a power of
* two. In the worst case, this function may require multiple
* iterations to ensure uniformity.
*/
ISC_LANG_ENDDECLS
|
