Release 4.10 include/linux/random.h
/*
* include/linux/random.h
*
* Include file for the random number generator.
*/
#ifndef _LINUX_RANDOM_H
#define _LINUX_RANDOM_H
#include <linux/list.h>
#include <linux/once.h>
#include <uapi/linux/random.h>
struct random_ready_callback {
struct list_head list;
void (*func)(struct random_ready_callback *rdy);
struct module *owner;
};
extern void add_device_randomness(const void *, unsigned int);
#if defined(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) && !defined(__CHECKER__)
static inline void add_latent_entropy(void)
{
add_device_randomness((const void *)&latent_entropy,
sizeof(latent_entropy));
}
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#else
static inline void add_latent_entropy(void) {}
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#endif
extern void add_input_randomness(unsigned int type, unsigned int code,
unsigned int value) __latent_entropy;
extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy;
extern void get_random_bytes(void *buf, int nbytes);
extern int add_random_ready_callback(struct random_ready_callback *rdy);
extern void del_random_ready_callback(struct random_ready_callback *rdy);
extern void get_random_bytes_arch(void *buf, int nbytes);
extern int random_int_secret_init(void);
#ifndef MODULE
extern const struct file_operations random_fops, urandom_fops;
#endif
unsigned int get_random_int(void);
unsigned long get_random_long(void);
unsigned long randomize_page(unsigned long start, unsigned long range);
u32 prandom_u32(void);
void prandom_bytes(void *buf, size_t nbytes);
void prandom_seed(u32 seed);
void prandom_reseed_late(void);
struct rnd_state {
__u32 s1, s2, s3, s4;
};
u32 prandom_u32_state(struct rnd_state *state);
void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
#define prandom_init_once(pcpu_state) \
DO_ONCE(prandom_seed_full_state, (pcpu_state))
/**
* prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
* @ep_ro: right open interval endpoint
*
* Returns a pseudo-random number that is in interval [0, ep_ro). Note
* that the result depends on PRNG being well distributed in [0, ~0U]
* u32 space. Here we use maximally equidistributed combined Tausworthe
* generator, that is, prandom_u32(). This is useful when requesting a
* random index of an array containing ep_ro elements, for example.
*
* Returns: pseudo-random number in interval [0, ep_ro)
*/
static inline u32 prandom_u32_max(u32 ep_ro)
{
return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
}
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/*
* Handle minimum values for seeds
*/
static inline u32 __seed(u32 x, u32 m)
{
return (x < m) ? x + m : x;
}
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/**
* prandom_seed_state - set seed for prandom_u32_state().
* @state: pointer to state structure to receive the seed.
* @seed: arbitrary 64-bit value to use as a seed.
*/
static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
{
u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
state->s1 = __seed(i, 2U);
state->s2 = __seed(i, 8U);
state->s3 = __seed(i, 16U);
state->s4 = __seed(i, 128U);
}
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| Total | 76 | 100.00% | 3 | 100.00% |
#ifdef CONFIG_ARCH_RANDOM
# include <asm/archrandom.h>
#else
static inline bool arch_get_random_long(unsigned long *v)
{
return 0;
}
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static inline bool arch_get_random_int(unsigned int *v)
{
return 0;
}
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static inline bool arch_has_random(void)
{
return 0;
}
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static inline bool arch_get_random_seed_long(unsigned long *v)
{
return 0;
}
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static inline bool arch_get_random_seed_int(unsigned int *v)
{
return 0;
}
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static inline bool arch_has_random_seed(void)
{
return 0;
}
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#endif
/* Pseudo random number generator from numerical recipes. */
static inline u32 next_pseudo_random32(u32 seed)
{
return seed * 1664525 + 1013904223;
}
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#endif /* _LINUX_RANDOM_H */
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| daniel borkmann | daniel borkmann | 81 | 14.49% | 5 | 14.71% |
| emese revfy | emese revfy | 60 | 10.73% | 2 | 5.88% |
| herbert xu | herbert xu | 49 | 8.77% | 1 | 2.94% |
| pre-git | pre-git | 44 | 7.87% | 5 | 14.71% |
| akinobu mita | akinobu mita | 30 | 5.37% | 2 | 5.88% |
| theodore tso | theodore tso | 20 | 3.58% | 3 | 8.82% |
| tom herbert | tom herbert | 18 | 3.22% | 1 | 2.94% |
| linus torvalds | linus torvalds | 12 | 2.15% | 1 | 2.94% |
| jason cooper | jason cooper | 11 | 1.97% | 1 | 2.94% |
| stephen hemminger | stephen hemminger | 11 | 1.97% | 1 | 2.94% |
| arjan van de ven | arjan van de ven | 10 | 1.79% | 2 | 5.88% |
| matt mackall | matt mackall | 9 | 1.61% | 1 | 2.94% |
| daniel cashman | daniel cashman | 7 | 1.25% | 1 | 2.94% |
| hannes frederic sowa | hannes frederic sowa | 6 | 1.07% | 1 | 2.94% |
| stephan mueller | stephan mueller | 1 | 0.18% | 1 | 2.94% |
| david howells | david howells | 1 | 0.18% | 1 | 2.94% |
| Total | 559 | 100.00% | 34 | 100.00% |
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