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
32u32 prandom_u32_state(struct rnd_state *);
33void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
34
35/*
36 * Handle minimum values for seeds
37 */
38static inline u32 __seed(u32 x, u32 m)
39{
40 return (x < m) ? x + m : x;
41}
42
43/**
44 * prandom_seed_state - set seed for prandom_u32_state().
45 * @state: pointer to state structure to receive the seed.
46 * @seed: arbitrary 64-bit value to use as a seed.
47 */
48static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
49{
50 u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
51
52 state->s1 = __seed(i, 1);
53 state->s2 = __seed(i, 7);
54 state->s3 = __seed(i, 15);
55}
56
57#ifdef CONFIG_ARCH_RANDOM
58# include <asm/archrandom.h>
59#else
60static inline int arch_get_random_long(unsigned long *v)
61{
62 return 0;
63}
64static inline int arch_get_random_int(unsigned int *v)
65{
66 return 0;
67}
68#endif
69
70/* Pseudo random number generator from numerical recipes. */
71static inline u32 next_pseudo_random32(u32 seed)
72{
73 return seed * 1664525 + 1013904223;
74}
75
76#endif /* _LINUX_RANDOM_H */