Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * include/linux/random.h | |
3 | * | |
4 | * Include file for the random number generator. | |
5 | */ | |
6 | ||
7 | #ifndef _LINUX_RANDOM_H | |
8 | #define _LINUX_RANDOM_H | |
9 | ||
68622c61 | 10 | #include <linux/types.h> |
1da177e4 | 11 | #include <linux/ioctl.h> |
0ebb26e7 | 12 | #include <linux/irqnr.h> |
1da177e4 LT |
13 | |
14 | /* ioctl()'s for the random number generator */ | |
15 | ||
16 | /* Get the entropy count. */ | |
17 | #define RNDGETENTCNT _IOR( 'R', 0x00, int ) | |
18 | ||
19 | /* Add to (or subtract from) the entropy count. (Superuser only.) */ | |
20 | #define RNDADDTOENTCNT _IOW( 'R', 0x01, int ) | |
21 | ||
22 | /* Get the contents of the entropy pool. (Superuser only.) */ | |
23 | #define RNDGETPOOL _IOR( 'R', 0x02, int [2] ) | |
24 | ||
25 | /* | |
26 | * Write bytes into the entropy pool and add to the entropy count. | |
27 | * (Superuser only.) | |
28 | */ | |
29 | #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] ) | |
30 | ||
31 | /* Clear entropy count to 0. (Superuser only.) */ | |
32 | #define RNDZAPENTCNT _IO( 'R', 0x04 ) | |
33 | ||
34 | /* Clear the entropy pool and associated counters. (Superuser only.) */ | |
35 | #define RNDCLEARPOOL _IO( 'R', 0x06 ) | |
36 | ||
37 | struct rand_pool_info { | |
38 | int entropy_count; | |
39 | int buf_size; | |
40 | __u32 buf[0]; | |
41 | }; | |
42 | ||
5960164f JE |
43 | struct rnd_state { |
44 | __u32 s1, s2, s3; | |
45 | }; | |
46 | ||
1da177e4 LT |
47 | /* Exported functions */ |
48 | ||
49 | #ifdef __KERNEL__ | |
50 | ||
a2080a67 | 51 | extern void add_device_randomness(const void *, unsigned int); |
1da177e4 LT |
52 | extern void add_input_randomness(unsigned int type, unsigned int code, |
53 | unsigned int value); | |
775f4b29 | 54 | extern void add_interrupt_randomness(int irq, int irq_flags); |
1da177e4 LT |
55 | |
56 | extern void get_random_bytes(void *buf, int nbytes); | |
c2557a30 | 57 | extern void get_random_bytes_arch(void *buf, int nbytes); |
1da177e4 LT |
58 | void generate_random_uuid(unsigned char uuid_out[16]); |
59 | ||
1da177e4 | 60 | #ifndef MODULE |
54047320 | 61 | extern const struct file_operations random_fops, urandom_fops; |
1da177e4 LT |
62 | #endif |
63 | ||
64 | unsigned int get_random_int(void); | |
65 | unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); | |
66 | ||
aaa248f6 SH |
67 | u32 random32(void); |
68 | void srandom32(u32 seed); | |
69 | ||
5960164f JE |
70 | u32 prandom32(struct rnd_state *); |
71 | ||
72 | /* | |
73 | * Handle minimum values for seeds | |
74 | */ | |
75 | static inline u32 __seed(u32 x, u32 m) | |
76 | { | |
77 | return (x < m) ? x + m : x; | |
78 | } | |
79 | ||
80 | /** | |
81 | * prandom32_seed - set seed for prandom32(). | |
82 | * @state: pointer to state structure to receive the seed. | |
83 | * @seed: arbitrary 64-bit value to use as a seed. | |
84 | */ | |
85 | static inline void prandom32_seed(struct rnd_state *state, u64 seed) | |
86 | { | |
87 | u32 i = (seed >> 32) ^ (seed << 10) ^ seed; | |
88 | ||
89 | state->s1 = __seed(i, 1); | |
90 | state->s2 = __seed(i, 7); | |
91 | state->s3 = __seed(i, 15); | |
92 | } | |
93 | ||
63d77173 PA |
94 | #ifdef CONFIG_ARCH_RANDOM |
95 | # include <asm/archrandom.h> | |
96 | #else | |
97 | static inline int arch_get_random_long(unsigned long *v) | |
98 | { | |
99 | return 0; | |
100 | } | |
101 | static inline int arch_get_random_int(unsigned int *v) | |
102 | { | |
103 | return 0; | |
104 | } | |
105 | #endif | |
106 | ||
1da177e4 LT |
107 | #endif /* __KERNEL___ */ |
108 | ||
109 | #endif /* _LINUX_RANDOM_H */ |