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