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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 <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 */
 69 

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