include/linux/random.h

   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
  12 extern void add_device_randomness(const void *, unsigned int);
  13 extern void add_input_randomness(unsigned int type, unsigned int code,
  14                                  unsigned int value);
  15 extern void add_interrupt_randomness(int irq, int irq_flags);
  16
  17 extern void get_random_bytes(void *buf, int nbytes);
  18 extern void get_random_bytes_arch(void *buf, int nbytes);
  19 void generate_random_uuid(unsigned char uuid_out[16]);
  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 random32(void);
  29 void srandom32(u32 seed);
  30
  31 u32 prandom32(struct rnd_state *);
  32
  33 /*
  34  * Handle minimum values for seeds
  35  */
  36 static 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  */
  46 static 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
  58 static inline int arch_get_random_long(unsigned long *v)
  59 {
  60         return 0;
  61 }
  62 static inline int arch_get_random_int(unsigned int *v)
  63 {
  64         return 0;
  65 }
  66 #endif
  67
  68 #endif /* _LINUX_RANDOM_H */