rand.h File Reference

Functions to get randomness. More...

#include <freeradius-devel/build.h>
#include <freeradius-devel/missing.h>
#include <stddef.h>
#include <stdint.h>

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Data Structures
struct	fr_fast_rand_t
	Smaller fast random number generator. More...
struct	fr_randctx

Functions
uint32_t	fr_fast_rand (fr_fast_rand_t *ctx)
void	fr_isaac (fr_randctx *ctx)
void	fr_isaac_init (fr_randctx *ctx, int flag)
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 *, size_t)
	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...

Detailed Description

Functions to get randomness.

Copyright

1999-2017 The FreeRADIUS server project

Definition in file rand.h.

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Data Structure Documentation

fr_fast_rand_t

struct fr_fast_rand_t

Smaller fast random number generator.

From George Marsaglia's Multiply with Carry (MWC) algorithm.

The two seeds here should be initialized by calling fr_rand(), or for tests, via some static values.

Definition at line 54 of file rand.h.

Data Fields
uint32_t	a
uint32_t	b

fr_randctx

struct fr_randctx

Definition at line 38 of file rand.h.

Data Fields
uint32_t	randa
uint32_t	randb
uint32_t	randc
uint32_t	randcnt
uint32_t	randmem[256]
uint32_t	randrsl[256]

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_isaac()

void fr_isaac

(

fr_randctx *

ctx

)

Definition at line 46 of file isaac.c.

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fr_isaac_init()

void fr_isaac_init	(	fr_randctx *	ctx,
		int	flag
	)

Definition at line 85 of file isaac.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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