Release 4.14 include/linux/random.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Emese Revfy
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%

#else


static inline void add_latent_entropy(void) {}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Emese Revfy
8
100.00%
1
100.00%
Total
8
100.00%
1
100.00%

#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 wait_for_random_bytes(void);
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);

#ifndef MODULE
extern const struct file_operations random_fops, urandom_fops;
#endif

u32 get_random_u32(void);
u64 get_random_u64(void);


static inline unsigned int get_random_int(void)
{
	return get_random_u32();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jason A. Donenfeld
14
100.00%
1
100.00%
Total
14
100.00%
1
100.00%



static inline unsigned long get_random_long(void)
{
#if BITS_PER_LONG == 64
	return get_random_u64();
#else
	return get_random_u32();
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jason A. Donenfeld
21
77.78%
1
33.33%
Daniel Cashman
4
14.81%
1
33.33%
Arjan van de Ven
2
7.41%
1
33.33%
Total
27
100.00%
3
100.00%

/*
 * On 64-bit architectures, protect against non-terminated C string overflows
 * by zeroing out the first byte of the canary; this leaves 56 bits of entropy.
 */
#ifdef CONFIG_64BIT
# ifdef __LITTLE_ENDIAN

#  define CANARY_MASK 0xffffffffffffff00UL
# else /* big endian, 64 bits: */

#  define CANARY_MASK 0x00ffffffffffffffUL
# endif
#else /* 32 bits: */

# define CANARY_MASK 0xffffffffUL
#endif



static inline unsigned long get_random_canary(void)
{
	unsigned long val = get_random_long();

	return val & CANARY_MASK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rik Van Riel
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%

/* Calls wait_for_random_bytes() and then calls get_random_bytes(buf, nbytes).
 * Returns the result of the call to wait_for_random_bytes. */


static inline int get_random_bytes_wait(void *buf, int nbytes)
{
	int ret = wait_for_random_bytes();
	if (unlikely(ret))
		return ret;
	get_random_bytes(buf, nbytes);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jason A. Donenfeld
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%


#define declare_get_random_var_wait(var) \
	static inline int get_random_ ## var ## _wait(var *out) { \
                int ret = wait_for_random_bytes(); \
                if (unlikely(ret)) \
                        return ret; \
                *out = get_random_ ## var(); \
                return 0; \
        }
declare_get_random_var_wait(u32)
declare_get_random_var_wait(u64)
declare_get_random_var_wait(int)
declare_get_random_var_wait(long)

#undef declare_get_random_var

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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Borkmann
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%

/*
 * Handle minimum values for seeds
 */


static inline u32 __seed(u32 x, u32 m)
{
	return (x < m) ? x + m : x;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joe Eykholt
26
100.00%
1
100.00%
Total
26
100.00%
1
100.00%

/**
 * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joe Eykholt
61
80.26%
1
33.33%
Daniel Borkmann
14
18.42%
1
33.33%
Akinobu Mita
1
1.32%
1
33.33%
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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%



static inline bool arch_get_random_int(unsigned int *v)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%



static inline bool arch_has_random(void)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
12
100.00%
2
100.00%
Total
12
100.00%
2
100.00%



static inline bool arch_get_random_seed_long(unsigned long *v)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%



static inline bool arch_get_random_seed_int(unsigned int *v)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%



static inline bool arch_has_random_seed(void)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
12
100.00%
2
100.00%
Total
12
100.00%
2
100.00%

#endif

/* Pseudo random number generator from numerical recipes. */


static inline u32 next_pseudo_random32(u32 seed)
{
	return seed * 1664525 + 1013904223;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%

#endif /* _LINUX_RANDOM_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jason A. Donenfeld
118
16.43%
3
7.89%
Joe Eykholt
95
13.23%
1
2.63%
H. Peter Anvin
94
13.09%
4
10.53%
Daniel Borkmann
81
11.28%
5
13.16%
Emese Revfy
60
8.36%
2
5.26%
Rik Van Riel
51
7.10%
1
2.63%
Herbert Xu
49
6.82%
1
2.63%
Linus Torvalds (pre-git)
44
6.13%
5
13.16%
Akinobu Mita
30
4.18%
2
5.26%
Tom Herbert
18
2.51%
1
2.63%
Theodore Y. Ts'o
13
1.81%
2
5.26%
Linus Torvalds
12
1.67%
1
2.63%
Jason Cooper
11
1.53%
1
2.63%
Stephen Hemminger
11
1.53%
1
2.63%
Matt Mackall
9
1.25%
1
2.63%
Arjan van de Ven
7
0.97%
2
5.26%
Hannes Frederic Sowa
6
0.84%
1
2.63%
Daniel Cashman
6
0.84%
1
2.63%
Stephan Mueller
1
0.14%
1
2.63%
Greg Kroah-Hartman
1
0.14%
1
2.63%
David Howells
1
0.14%
1
2.63%
Total
718
100.00%
38
100.00%
Directory: include/linux

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.