rand.c File Reference

Functions to get randomness. More...

#include <freeradius-devel/util/rand.h>
#include <freeradius-devel/util/hash.h>
#include <fcntl.h>
#include <stdbool.h>

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Macros
#define	fill(_expr)

Functions
uint32_t	fr_fast_rand (fr_fast_rand_t *ctx)
uint32_t	fr_rand (void)
	Return a 32-bit random number. More...
void	fr_rand_buffer (void *start, size_t length)
void	fr_rand_init (void)
void	fr_rand_mixin (void const *data, size_t size)
	Mix data into the random number generator. More...
void	fr_rand_str (uint8_t *out, size_t len, char class)
	Generate a random string. More...

Variables
static _Thread_local bool	fr_rand_initialized = false
static _Thread_local fr_randctx	fr_rand_pool
	A pool of pre-generated random integers. More...

Detailed Description

Functions to get randomness.

Copyright

1999-2017 The FreeRADIUS server project

Definition in file rand.c.

Macro Definition Documentation

fill

#define fill

(

_expr

)

Value:

do { \
while (p < end) { \
        if ((mod = ((p - out) & (sizeof(word) - 1))) == 0) word = fr_rand(); \
        byte = ((uint8_t *)&word)[mod]; \
        *p++ = (_expr); \
} } while (0)

Function Documentation

fr_fast_rand()

uint32_t fr_fast_rand

(

fr_fast_rand_t *

ctx

)

Definition at line 280 of file rand.c.

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fr_rand()

uint32_t fr_rand

(

void

)

Return a 32-bit random number.

Definition at line 106 of file rand.c.

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fr_rand_buffer()

void fr_rand_buffer	(	void *	start,
		size_t	length
	)

Definition at line 126 of file rand.c.

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fr_rand_init()

void fr_rand_init

(

void

)

Definition at line 34 of file rand.c.

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fr_rand_mixin()

void fr_rand_mixin	(	void const *	data,
		size_t	size
	)

Mix data into the random number generator.

May be called any number of times.

Definition at line 80 of file rand.c.

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fr_rand_str()

void fr_rand_str	(	uint8_t *	out,
		size_t	len,
		char	class
	)

Generate a random string.

Note

Character selection is not perfectly distributed, should not be used for cryptographic purposes.

Parameters

[out]	out	Where to write the string
[in]	len	Length of the output buffer.
[in]	class	to pick characters from (see function body).

Definition at line 164 of file rand.c.

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Variable Documentation

fr_rand_initialized

_Thread_local bool fr_rand_initialized = false

static

Definition at line 32 of file rand.c.

fr_rand_pool

_Thread_local fr_randctx fr_rand_pool

static

A pool of pre-generated random integers.

Definition at line 31 of file rand.c.