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Linux/include/linux/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 <linux/list.h>
 10 #include <linux/once.h>
 11 
 12 #include <uapi/linux/random.h>
 13 
 14 struct random_ready_callback {
 15         struct list_head list;
 16         void (*func)(struct random_ready_callback *rdy);
 17         struct module *owner;
 18 };
 19 
 20 extern void add_device_randomness(const void *, unsigned int);
 21 extern void add_input_randomness(unsigned int type, unsigned int code,
 22                                  unsigned int value);
 23 extern void add_interrupt_randomness(int irq, int irq_flags);
 24 
 25 extern void get_random_bytes(void *buf, int nbytes);
 26 extern int add_random_ready_callback(struct random_ready_callback *rdy);
 27 extern void del_random_ready_callback(struct random_ready_callback *rdy);
 28 extern void get_random_bytes_arch(void *buf, int nbytes);
 29 void generate_random_uuid(unsigned char uuid_out[16]);
 30 extern int random_int_secret_init(void);
 31 
 32 #ifndef MODULE
 33 extern const struct file_operations random_fops, urandom_fops;
 34 #endif
 35 
 36 unsigned int get_random_int(void);
 37 unsigned long get_random_long(void);
 38 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
 39 
 40 u32 prandom_u32(void);
 41 void prandom_bytes(void *buf, size_t nbytes);
 42 void prandom_seed(u32 seed);
 43 void prandom_reseed_late(void);
 44 
 45 struct rnd_state {
 46         __u32 s1, s2, s3, s4;
 47 };
 48 
 49 u32 prandom_u32_state(struct rnd_state *state);
 50 void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
 51 void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
 52 
 53 #define prandom_init_once(pcpu_state)                   \
 54         DO_ONCE(prandom_seed_full_state, (pcpu_state))
 55 
 56 /**
 57  * prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
 58  * @ep_ro: right open interval endpoint
 59  *
 60  * Returns a pseudo-random number that is in interval [0, ep_ro). Note
 61  * that the result depends on PRNG being well distributed in [0, ~0U]
 62  * u32 space. Here we use maximally equidistributed combined Tausworthe
 63  * generator, that is, prandom_u32(). This is useful when requesting a
 64  * random index of an array containing ep_ro elements, for example.
 65  *
 66  * Returns: pseudo-random number in interval [0, ep_ro)
 67  */
 68 static inline u32 prandom_u32_max(u32 ep_ro)
 69 {
 70         return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
 71 }
 72 
 73 /*
 74  * Handle minimum values for seeds
 75  */
 76 static inline u32 __seed(u32 x, u32 m)
 77 {
 78         return (x < m) ? x + m : x;
 79 }
 80 
 81 /**
 82  * prandom_seed_state - set seed for prandom_u32_state().
 83  * @state: pointer to state structure to receive the seed.
 84  * @seed: arbitrary 64-bit value to use as a seed.
 85  */
 86 static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
 87 {
 88         u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
 89 
 90         state->s1 = __seed(i,   2U);
 91         state->s2 = __seed(i,   8U);
 92         state->s3 = __seed(i,  16U);
 93         state->s4 = __seed(i, 128U);
 94 }
 95 
 96 #ifdef CONFIG_ARCH_RANDOM
 97 # include <asm/archrandom.h>
 98 #else
 99 static inline int arch_get_random_long(unsigned long *v)
100 {
101         return 0;
102 }
103 static inline int arch_get_random_int(unsigned int *v)
104 {
105         return 0;
106 }
107 static inline int arch_has_random(void)
108 {
109         return 0;
110 }
111 static inline int arch_get_random_seed_long(unsigned long *v)
112 {
113         return 0;
114 }
115 static inline int arch_get_random_seed_int(unsigned int *v)
116 {
117         return 0;
118 }
119 static inline int arch_has_random_seed(void)
120 {
121         return 0;
122 }
123 #endif
124 
125 /* Pseudo random number generator from numerical recipes. */
126 static inline u32 next_pseudo_random32(u32 seed)
127 {
128         return seed * 1664525 + 1013904223;
129 }
130 
131 #endif /* _LINUX_RANDOM_H */
132 

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