wiced_crypto.c File Reference

Functions
wiced_result_t	wiced_crypto_add_entropy (const void *buffer, uint16_t buffer_length)
wiced_result_t	wiced_crypto_get_random (void *buffer, uint16_t buffer_length)
void	wiced_crypto_prng_add_low_variability_entropy (uint32_t cycles)
wiced_result_t	wiced_crypto_set_prng (wiced_crypto_prng_t *prng)
wiced_result_t	wiced_crypto_use_default_prng (void)

Detailed Description

Cryptographic functions

Provides cryptographic functions for use in applications

Function Documentation

wiced_result_t wiced_crypto_add_entropy	(	const void *	buffer,
		uint16_t	buffer_length
	)

Feed entropy into random number generator.

Parameters

buffer	: pointer to the buffer which contains random data
buffer_length	: size of the buffer

Returns

WICED_SUCCESS or Error code

wiced_result_t wiced_crypto_get_random	(	void *	buffer,
		uint16_t	buffer_length
	)

Gets a 16 bit random numbers.

Allows user applications to retrieve 16 bit random numbers. If cryptographic security for rand numbers is required, call wiced_crypto_use_secure_prng first

Parameters

buffer	: pointer to the buffer which will receive the generated random data
buffer_length	: size of the buffer

Returns

WICED_SUCCESS or Error code

void wiced_crypto_prng_add_low_variability_entropy

(

uint32_t

entropy

)

Use the parameter to seed the default pseudo-random number generator (PRNG) from a low variability source. Examples of this type of entropy are cycles taken to complete a function. Note this type of seeding is usually most effective if the secure PRNG is compiled in. (See wiced_crypto_use_secure_prng for more info.)

Parameters

entropy

: variable holding a value with some small amount of variability that can be used as an initial seed Example: number of cycles to complete functions accessing hardware

Returns

WICED_SUCCESS or Error code

wiced_result_t wiced_crypto_set_prng

(

wiced_crypto_prng_t *

prng

)

Set new PRNG implementation.

Parameters

prng	: pointer to PRNG implementation, if NULL then default (Well512) would be used

Returns

WICED_SUCCESS or Error code

wiced_result_t wiced_crypto_use_default_prng

(

void

)

Use default PRNG (currently Well512). This is not a cryptographically secure PRNG. Advantage is, relatively small memory requirements.

Returns

WICED_SUCCESS