blob: c8ca256b86b5f0750c3c790d00769e1459936b3d (
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
|
// Copyright 2020-2022 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#ifndef MUMBLE_CRYPTOGRAPHICRANDOM_H_
#define MUMBLE_CRYPTOGRAPHICRANDOM_H_
#include <stdint.h>
/// CryptographicRandom provides useful utilities for acquiring
/// pseudo-random data for use in cryptography.
class CryptographicRandom {
public:
/// Fill the buffer at |buf| with |numBytes| bytes of pseudo-random data.
/// The value of |numBytes| must be >= 0. Otherwise, program execution is aborted.
///
/// This function is equivalent to the arc4random_buf() function from OpenBSD.
///
/// This function should not ever fail. It is considered a catastrophic failure if
/// it does. The program is aborted if the function fails, because it is generally
/// impossible to recover from such a scenario.
static void fillBuffer(void *buf, int numBytes);
/// Return a pseudo-random number in the range of 0 to (2**32)-1.
///
/// This function is equivalent to the arc4random() function from OpenBSD.
///
/// This function should not ever fail. It is considered a catastrophic failure if
/// it does. The program is aborted if the function fails, because it is generally
/// impossible to recover from such a scenario.
static uint32_t uint32();
/// Calculate a uniformly distributed random number less than |upperBound|
/// avoiding "modulo bias".
///
/// This function is equivalent to the arc4random_uniform() function from OpenBSD.
///
/// This function should not ever fail. It is considered a catastrophic failure if
/// it does. The program is aborted if the function fails, because it is generally
/// impossible to recover from such a scenario.
static uint32_t uniform(uint32_t upperBound);
};
#endif
|
