~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/random.h

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 get_random_long(void);
 27 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
 28 
 29 u32 prandom_u32(void);
 30 void prandom_bytes(void *buf, size_t nbytes);
 31 void prandom_seed(u32 seed);
 32 void prandom_reseed_late(void);
 33 
 34 struct rnd_state {
 35         __u32 s1, s2, s3, s4;
 36 };
 37 
 38 u32 prandom_u32_state(struct rnd_state *state);
 39 void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
 40 
 41 /**
 42  * prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
 43  * @ep_ro: right open interval endpoint
 44  *
 45  * Returns a pseudo-random number that is in interval [0, ep_ro). Note
 46  * that the result depends on PRNG being well distributed in [0, ~0U]
 47  * u32 space. Here we use maximally equidistributed combined Tausworthe
 48  * generator, that is, prandom_u32(). This is useful when requesting a
 49  * random index of an array containing ep_ro elements, for example.
 50  *
 51  * Returns: pseudo-random number in interval [0, ep_ro)
 52  */
 53 static inline u32 prandom_u32_max(u32 ep_ro)
 54 {
 55         return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
 56 }
 57 
 58 /*
 59  * Handle minimum values for seeds
 60  */
 61 static inline u32 __seed(u32 x, u32 m)
 62 {
 63         return (x < m) ? x + m : x;
 64 }
 65 
 66 /**
 67  * prandom_seed_state - set seed for prandom_u32_state().
 68  * @state: pointer to state structure to receive the seed.
 69  * @seed: arbitrary 64-bit value to use as a seed.
 70  */
 71 static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
 72 {
 73         u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
 74 
 75         state->s1 = __seed(i,   2U);
 76         state->s2 = __seed(i,   8U);
 77         state->s3 = __seed(i,  16U);
 78         state->s4 = __seed(i, 128U);
 79 }
 80 
 81 #ifdef CONFIG_ARCH_RANDOM
 82 # include <asm/archrandom.h>
 83 #else
 84 static inline int arch_get_random_long(unsigned long *v)
 85 {
 86         return 0;
 87 }
 88 static inline int arch_get_random_int(unsigned int *v)
 89 {
 90         return 0;
 91 }
 92 static inline int arch_has_random(void)
 93 {
 94         return 0;
 95 }
 96 static inline int arch_get_random_seed_long(unsigned long *v)
 97 {
 98         return 0;
 99 }
100 static inline int arch_get_random_seed_int(unsigned int *v)
101 {
102         return 0;
103 }
104 static inline int arch_has_random_seed(void)
105 {
106         return 0;
107 }
108 #endif
109 
110 /* Pseudo random number generator from numerical recipes. */
111 static inline u32 next_pseudo_random32(u32 seed)
112 {
113         return seed * 1664525 + 1013904223;
114 }
115 
116 #endif /* _LINUX_RANDOM_H */
117 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp