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 random32(void);
  29void srandom32(u32 seed);
  30
  31u32 prandom32(struct rnd_state *);
  32
  33/*
  34 * Handle minimum values for seeds
  35 */
  36static inline u32 __seed(u32 x, u32 m)
  37{
  38        return (x < m) ? x + m : x;
  39}
  40
  41/**
  42 * prandom32_seed - set seed for prandom32().
  43 * @state: pointer to state structure to receive the seed.
  44 * @seed: arbitrary 64-bit value to use as a seed.
  45 */
  46static inline void prandom32_seed(struct rnd_state *state, u64 seed)
  47{
  48        u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
  49
  50        state->s1 = __seed(i, 1);
  51        state->s2 = __seed(i, 7);
  52        state->s3 = __seed(i, 15);
  53}
  54
  55#ifdef CONFIG_ARCH_RANDOM
  56# include <asm/archrandom.h>
  57#else
  58static inline int arch_get_random_long(unsigned long *v)
  59{
  60        return 0;
  61}
  62static inline int arch_get_random_int(unsigned int *v)
  63{
  64        return 0;
  65}
  66#endif
  67
  68#endif /* _LINUX_RANDOM_H */
  69
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