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TOMOYO Linux Cross Reference
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 <uapi/linux/random.h>
 10 
 11 extern void add_device_randomness(const void *, unsigned int);
 12 extern void add_input_randomness(unsigned int type, unsigned int code,
 13                                  unsigned int value);
 14 extern void add_interrupt_randomness(int irq, int irq_flags);
 15 
 16 extern void get_random_bytes(void *buf, int nbytes);
 17 extern void get_random_bytes_arch(void *buf, int nbytes);
 18 void generate_random_uuid(unsigned char uuid_out[16]);
 19 extern int random_int_secret_init(void);
 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 prandom_u32(void);
 29 void prandom_bytes(void *buf, int nbytes);
 30 void prandom_seed(u32 seed);
 31 void prandom_reseed_late(void);
 32 
 33 struct rnd_state {
 34         __u32 s1, s2, s3, s4;
 35 };
 36 
 37 u32 prandom_u32_state(struct rnd_state *state);
 38 void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
 39 
 40 /**
 41  * prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
 42  * @ep_ro: right open interval endpoint
 43  *
 44  * Returns a pseudo-random number that is in interval [0, ep_ro). Note
 45  * that the result depends on PRNG being well distributed in [0, ~0U]
 46  * u32 space. Here we use maximally equidistributed combined Tausworthe
 47  * generator, that is, prandom_u32(). This is useful when requesting a
 48  * random index of an array containing ep_ro elements, for example.
 49  *
 50  * Returns: pseudo-random number in interval [0, ep_ro)
 51  */
 52 static inline u32 prandom_u32_max(u32 ep_ro)
 53 {
 54         return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
 55 }
 56 
 57 /*
 58  * Handle minimum values for seeds
 59  */
 60 static inline u32 __seed(u32 x, u32 m)
 61 {
 62         return (x < m) ? x + m : x;
 63 }
 64 
 65 /**
 66  * prandom_seed_state - set seed for prandom_u32_state().
 67  * @state: pointer to state structure to receive the seed.
 68  * @seed: arbitrary 64-bit value to use as a seed.
 69  */
 70 static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
 71 {
 72         u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
 73 
 74         state->s1 = __seed(i,   2U);
 75         state->s2 = __seed(i,   8U);
 76         state->s3 = __seed(i,  16U);
 77         state->s4 = __seed(i, 128U);
 78 }
 79 
 80 #ifdef CONFIG_ARCH_RANDOM
 81 # include <asm/archrandom.h>
 82 #else
 83 static inline int arch_get_random_long(unsigned long *v)
 84 {
 85         return 0;
 86 }
 87 static inline int arch_get_random_int(unsigned int *v)
 88 {
 89         return 0;
 90 }
 91 #endif
 92 
 93 /* Pseudo random number generator from numerical recipes. */
 94 static inline u32 next_pseudo_random32(u32 seed)
 95 {
 96         return seed * 1664525 + 1013904223;
 97 }
 98 
 99 #endif /* _LINUX_RANDOM_H */
100 

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