Deterministic random bit generator. More...

Enumerations
enum	SYS_DRBG_ERROR { SYS_DRBG_ERROR_NONE = 0, SYS_DRBG_ERROR_BUFFER_EXHAUSTED = -1 }
	sys drbg errors More...

Functions
void	sys_drbg_srand (void)
	Set the seed for the random number generator function.

void	sys_drbg_init (void)
	Initializes the DRBG data structure. More...

SYS_DRBG_ERROR	sys_drbg_read_rand (uint32_t *rand_number)
	Reads a random number from the buffer which holds the random numbers. More...

void	sys_drbg_update (void)
	Updates the DRBG data structure. More...

uint32_t	sys_drbg_read_index (void)
	Reads the current index value of the buffer. More...

uint32_t	sys_drbg_read_threshold (void)
	Reads the threshold level value. More...

uint8_t	sys_drbg_read_request (void)
	Reads the request value. More...

Detailed Description

Deterministic random bit generator.

Enumeration Type Documentation

◆ SYS_DRBG_ERROR

enum SYS_DRBG_ERROR

sys drbg errors

Enumerator
SYS_DRBG_ERROR_NONE	no error
SYS_DRBG_ERROR_BUFFER_EXHAUSTED	buffer with random numbers has been exhausted

Function Documentation

◆ sys_drbg_init()

void sys_drbg_init ( void )

Initializes the DRBG data structure.

See also: sys_drbg_t

◆ sys_drbg_read_index()

uint32_t sys_drbg_read_index ( void )

Reads the current index value of the buffer.

Returns: The current index value of the buffer

◆ sys_drbg_read_rand()

SYS_DRBG_ERROR sys_drbg_read_rand ( uint32_t * rand_number )

Reads a random number from the buffer which holds the random numbers.

Note: When a random number is read from the buffer it is assumed to be consumed. The next time the sys_drbg_read_rand() will be called a new random number will be read from the buffer.

Parameters

[out] rand_number The random number to be returned

Returns: Error code. If 0 the random number was successfully read, otherwise not.

◆ sys_drbg_read_request()

uint8_t sys_drbg_read_request ( void )

Reads the request value.

Returns: Either 0 or 1. If the request value is 1, there is a pending request for buffer update.

◆ sys_drbg_read_threshold()

uint32_t sys_drbg_read_threshold ( void )

Reads the threshold level value.

Note: If the buffer's current index is equal to the threshold level value or greater than the threshold level value, then a request for buffer update will be issued.

Returns: The threshold level value

◆ sys_drbg_update()

void sys_drbg_update ( void )

Updates the DRBG data structure.

See also: sys_drbg_t

Enumerations

Functions