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random.h
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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 randomize_range(unsigned long start, unsigned long end, unsigned long len);
27 
28 u32 random32(void);
29 void srandom32(u32 seed);
30 
31 u32 prandom32(struct rnd_state *);
32 
33 /*
34  * Handle minimum values for seeds
35  */
36 static inline u32 __seed(u32 x, u32 m)
37 {
38  return (x < m) ? x + m : x;
39 }
40 
46 static inline void prandom32_seed(struct rnd_state *state, u64 seed)
47 {
48  u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
49 
50  state->s1 = __seed(i, 1);
51  state->s2 = __seed(i, 7);
52  state->s3 = __seed(i, 15);
53 }
54 
55 #ifdef CONFIG_ARCH_RANDOM
56 # include <asm/archrandom.h>
57 #else
58 static inline int arch_get_random_long(unsigned long *v)
59 {
60  return 0;
61 }
62 static inline int arch_get_random_int(unsigned int *v)
63 {
64  return 0;
65 }
66 #endif
67 
68 #endif /* _LINUX_RANDOM_H */