linux/include/linux/prandom.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/linux/prandom.h
 *
 * Include file for the fast pseudo-random 32-bit
 * generation.
 */
#ifndef _LINUX_PRANDOM_H
#define _LINUX_PRANDOM_H

#include <linux/types.h>
#include <linux/once.h>
#include <linux/random.h>

struct rnd_state { … };

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) …

/*
 * Handle minimum values for seeds
 */
static inline u32 __seed(u32 x, u32 m)
{ … }

/**
 * 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)
{ … }

/* Pseudo random number generator from numerical recipes. */
static inline u32 next_pseudo_random32(u32 seed)
{ … }

#endif