Linux kernel mirror (for testing)
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linux
1/*
2 * include/linux/random.h
3 *
4 * Include file for the random number generator.
5 */
6#ifndef _LINUX_RANDOM_H
7#define _LINUX_RANDOM_H
8
9#include <uapi/linux/random.h>
10
11
12extern void add_device_randomness(const void *, unsigned int);
13extern void add_input_randomness(unsigned int type, unsigned int code,
14 unsigned int value);
15extern void add_interrupt_randomness(int irq, int irq_flags);
16
17extern void get_random_bytes(void *buf, int nbytes);
18extern void get_random_bytes_arch(void *buf, int nbytes);
19void generate_random_uuid(unsigned char uuid_out[16]);
20
21#ifndef MODULE
22extern const struct file_operations random_fops, urandom_fops;
23#endif
24
25unsigned int get_random_int(void);
26unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
27
28u32 prandom_u32(void);
29void prandom_bytes(void *buf, int nbytes);
30void prandom_seed(u32 seed);
31
32/*
33 * These macros are preserved for backward compatibility and should be
34 * removed as soon as a transition is finished.
35 */
36#define random32() prandom_u32()
37#define srandom32(seed) prandom_seed(seed)
38
39u32 prandom_u32_state(struct rnd_state *);
40void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
41
42/*
43 * Handle minimum values for seeds
44 */
45static inline u32 __seed(u32 x, u32 m)
46{
47 return (x < m) ? x + m : x;
48}
49
50/**
51 * prandom_seed_state - set seed for prandom_u32_state().
52 * @state: pointer to state structure to receive the seed.
53 * @seed: arbitrary 64-bit value to use as a seed.
54 */
55static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
56{
57 u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
58
59 state->s1 = __seed(i, 1);
60 state->s2 = __seed(i, 7);
61 state->s3 = __seed(i, 15);
62}
63
64#ifdef CONFIG_ARCH_RANDOM
65# include <asm/archrandom.h>
66#else
67static inline int arch_get_random_long(unsigned long *v)
68{
69 return 0;
70}
71static inline int arch_get_random_int(unsigned int *v)
72{
73 return 0;
74}
75#endif
76
77/* Pseudo random number generator from numerical recipes. */
78static inline u32 next_pseudo_random32(u32 seed)
79{
80 return seed * 1664525 + 1013904223;
81}
82
83#endif /* _LINUX_RANDOM_H */