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
  12extern void add_device_randomness(const void *, unsigned int);
  13extern void add_input_randomness(unsigned int type, unsigned int code,
  14                                 unsigned int value);
  15extern void add_interrupt_randomness(int irq, int irq_flags);
  16
  17extern void get_random_bytes(void *buf, int nbytes);
  18extern void get_random_bytes_arch(void *buf, int nbytes);
  19void generate_random_uuid(unsigned char uuid_out[16]);
  20
  21#ifndef MODULE
  22extern const struct file_operations random_fops, urandom_fops;
  23#endif
  24
  25unsigned int get_random_int(void);
  26unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
  27
  28u32 prandom_u32(void);
  29void prandom_bytes(void *buf, int nbytes);
  30void prandom_seed(u32 seed);
  31
  32/*
  33 * These macros are preserved for backward compatibility and should be
  34 * removed as soon as a transition is finished.
  35 */
  36#define random32() prandom_u32()
  37#define srandom32(seed) prandom_seed(seed)
  38
  39u32 prandom_u32_state(struct rnd_state *);
  40void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
  41
  42/*
  43 * Handle minimum values for seeds
  44 */
  45static inline u32 __seed(u32 x, u32 m)
  46{
  47        return (x < m) ? x + m : x;
  48}
  49
  50/**
  51 * prandom_seed_state - set seed for prandom_u32_state().
  52 * @state: pointer to state structure to receive the seed.
  53 * @seed: arbitrary 64-bit value to use as a seed.
  54 */
  55static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
  56{
  57        u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
  58
  59        state->s1 = __seed(i, 1);
  60        state->s2 = __seed(i, 7);
  61        state->s3 = __seed(i, 15);
  62}
  63
  64#ifdef CONFIG_ARCH_RANDOM
  65# include <asm/archrandom.h>
  66#else
  67static inline int arch_get_random_long(unsigned long *v)
  68{
  69        return 0;
  70}
  71static inline int arch_get_random_int(unsigned int *v)
  72{
  73        return 0;
  74}
  75#endif
  76
  77/* Pseudo random number generator from numerical recipes. */
  78static inline u32 next_pseudo_random32(u32 seed)
  79{
  80        return seed * 1664525 + 1013904223;
  81}
  82
  83#endif /* _LINUX_RANDOM_H */
  84
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