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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 extern int random_int_secret_init(void);
 30 
 31 #ifndef MODULE
 32 extern const struct file_operations random_fops, urandom_fops;
 33 #endif
 34 
 35 unsigned int get_random_int(void);
 36 unsigned long get_random_long(void);
 37 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
 38 
 39 u32 prandom_u32(void);
 40 void prandom_bytes(void *buf, size_t nbytes);
 41 void prandom_seed(u32 seed);
 42 void prandom_reseed_late(void);
 43 
 44 struct rnd_state {
 45         __u32 s1, s2, s3, s4;
 46 };
 47 
 48 u32 prandom_u32_state(struct rnd_state *state);
 49 void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
 50 void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
 51 
 52 #define prandom_init_once(pcpu_state)                   \
 53         DO_ONCE(prandom_seed_full_state, (pcpu_state))
 54 
 55 /**
 56  * prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
 57  * @ep_ro: right open interval endpoint
 58  *
 59  * Returns a pseudo-random number that is in interval [0, ep_ro). Note
 60  * that the result depends on PRNG being well distributed in [0, ~0U]
 61  * u32 space. Here we use maximally equidistributed combined Tausworthe
 62  * generator, that is, prandom_u32(). This is useful when requesting a
 63  * random index of an array containing ep_ro elements, for example.
 64  *
 65  * Returns: pseudo-random number in interval [0, ep_ro)
 66  */
 67 static inline u32 prandom_u32_max(u32 ep_ro)
 68 {
 69         return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
 70 }
 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  * prandom_seed_state - set seed for prandom_u32_state().
 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 prandom_seed_state(struct rnd_state *state, u64 seed)
 86 {
 87         u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
 88 
 89         state->s1 = __seed(i,   2U);
 90         state->s2 = __seed(i,   8U);
 91         state->s3 = __seed(i,  16U);
 92         state->s4 = __seed(i, 128U);
 93 }
 94 
 95 #ifdef CONFIG_ARCH_RANDOM
 96 # include <asm/archrandom.h>
 97 #else
 98 static inline bool arch_get_random_long(unsigned long *v)
 99 {
100         return 0;
101 }
102 static inline bool arch_get_random_int(unsigned int *v)
103 {
104         return 0;
105 }
106 static inline bool arch_has_random(void)
107 {
108         return 0;
109 }
110 static inline bool arch_get_random_seed_long(unsigned long *v)
111 {
112         return 0;
113 }
114 static inline bool arch_get_random_seed_int(unsigned int *v)
115 {
116         return 0;
117 }
118 static inline bool arch_has_random_seed(void)
119 {
120         return 0;
121 }
122 #endif
123 
124 /* Pseudo random number generator from numerical recipes. */
125 static inline u32 next_pseudo_random32(u32 seed)
126 {
127         return seed * 1664525 + 1013904223;
128 }
129 
130 #endif /* _LINUX_RANDOM_H */
131 

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