API for generating pseudo random numbers. More...

Collaboration diagram for Pseudo Random Numbers:

Typedefs
typedef int(*	coap_rand_func_t) (void *out, size_t len)
	Data type for random number generator function. More...

Functions
void	coap_set_prng (coap_rand_func_t rng)
	Replaces the current random number generation function with the default function `rng`. More...

void	coap_prng_init (unsigned int seed)
	Seeds the default random number generation function with the given `seed`. More...

int	coap_prng (void *buf, size_t len)
	Fills `buf` with `len` random bytes using the default pseudo random number generator. More...

Detailed Description

API for generating pseudo random numbers.

Typedef Documentation

typedef int(* coap_rand_func_t) (void *out, size_t len)

Data type for random number generator function.

The function must fill len bytes of random data into the buffer starting at out. On success, the function should return 1, zero otherwise.

Definition at line 53 of file coap_prng.h.

Fills buf with len random bytes using the default pseudo random number generator.

The default PRNG can be changed with coap_set_prng(). This function returns 1 when len random bytes have been written to buf, zero otherwise.

Parameters

buf	The buffer to fill with random bytes.
len	The number of random bytes to write into `buf`.

Definition at line 140 of file coap_prng.c.

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void coap_prng_init ( unsigned int seed )

Seeds the default random number generation function with the given seed.

The default random number generation function will use getrandom() if available, ignoring the seed.

Parameters

seed	The seed for the pseudo random number generator.

Definition at line 128 of file coap_prng.c.

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void coap_set_prng ( coap_rand_func_t rng )

Replaces the current random number generation function with the default function rng.

Parameters

rng	The random number generation function to use.

Definition at line 123 of file coap_prng.c.