Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * include/linux/random.h | |
3 | * | |
4 | * Include file for the random number generator. | |
5 | */ | |
1da177e4 LT |
6 | #ifndef _LINUX_RANDOM_H |
7 | #define _LINUX_RANDOM_H | |
8 | ||
607ca46e | 9 | #include <uapi/linux/random.h> |
1da177e4 | 10 | |
1da177e4 | 11 | |
a2080a67 | 12 | extern void add_device_randomness(const void *, unsigned int); |
1da177e4 LT |
13 | extern void add_input_randomness(unsigned int type, unsigned int code, |
14 | unsigned int value); | |
775f4b29 | 15 | extern void add_interrupt_randomness(int irq, int irq_flags); |
1da177e4 LT |
16 | |
17 | extern void get_random_bytes(void *buf, int nbytes); | |
c2557a30 | 18 | extern void get_random_bytes_arch(void *buf, int nbytes); |
1da177e4 | 19 | void generate_random_uuid(unsigned char uuid_out[16]); |
47d06e53 | 20 | extern int random_int_secret_init(void); |
1da177e4 | 21 | |
1da177e4 | 22 | #ifndef MODULE |
54047320 | 23 | extern const struct file_operations random_fops, urandom_fops; |
1da177e4 LT |
24 | #endif |
25 | ||
26 | unsigned int get_random_int(void); | |
27 | unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); | |
28 | ||
496f2f93 | 29 | u32 prandom_u32(void); |
6582c665 | 30 | void prandom_bytes(void *buf, int nbytes); |
496f2f93 | 31 | void prandom_seed(u32 seed); |
4af712e8 | 32 | void prandom_reseed_late(void); |
aaa248f6 | 33 | |
38e9efcd | 34 | struct rnd_state { |
a98814ce | 35 | __u32 s1, s2, s3, s4; |
38e9efcd DB |
36 | }; |
37 | ||
a98814ce | 38 | u32 prandom_u32_state(struct rnd_state *state); |
6582c665 | 39 | void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes); |
5960164f JE |
40 | |
41 | /* | |
42 | * Handle minimum values for seeds | |
43 | */ | |
44 | static inline u32 __seed(u32 x, u32 m) | |
45 | { | |
46 | return (x < m) ? x + m : x; | |
47 | } | |
48 | ||
49 | /** | |
496f2f93 | 50 | * prandom_seed_state - set seed for prandom_u32_state(). |
5960164f JE |
51 | * @state: pointer to state structure to receive the seed. |
52 | * @seed: arbitrary 64-bit value to use as a seed. | |
53 | */ | |
496f2f93 | 54 | static inline void prandom_seed_state(struct rnd_state *state, u64 seed) |
5960164f JE |
55 | { |
56 | u32 i = (seed >> 32) ^ (seed << 10) ^ seed; | |
57 | ||
a98814ce DB |
58 | state->s1 = __seed(i, 2U); |
59 | state->s2 = __seed(i, 8U); | |
60 | state->s3 = __seed(i, 16U); | |
61 | state->s4 = __seed(i, 128U); | |
5960164f JE |
62 | } |
63 | ||
63d77173 PA |
64 | #ifdef CONFIG_ARCH_RANDOM |
65 | # include <asm/archrandom.h> | |
66 | #else | |
67 | static inline int arch_get_random_long(unsigned long *v) | |
68 | { | |
69 | return 0; | |
70 | } | |
71 | static inline int arch_get_random_int(unsigned int *v) | |
72 | { | |
73 | return 0; | |
74 | } | |
75 | #endif | |
76 | ||
055dc21a TH |
77 | /* Pseudo random number generator from numerical recipes. */ |
78 | static inline u32 next_pseudo_random32(u32 seed) | |
79 | { | |
80 | return seed * 1664525 + 1013904223; | |
81 | } | |
82 | ||
1da177e4 | 83 | #endif /* _LINUX_RANDOM_H */ |