Data Structures
struct	psa_drv_entropy_t
	A struct containing all of the function pointers needed to interface to an entropy source. More...

Typedefs
typedef psa_status_t(*	psa_drv_entropy_init_t) (void *p_context)
	Initialize an entropy driver. More...

typedef psa_status_t(*	psa_drv_entropy_get_bits_t) (void p_context, uint8_t p_buffer, uint32_t buffer_size, uint32_t *p_received_entropy_bits)
	Get a specified number of bits from the entropy source. More...

Detailed Description

Typedef Documentation

◆ psa_drv_entropy_init_t

typedef psa_status_t(* psa_drv_entropy_init_t) (void *p_context)

Initialize an entropy driver.

Parameters

[in,out] p_context A hardware-specific structure containing any context information for the implementation

Return values

PSA_SUCCESS

Definition at line 53 of file crypto_entropy_driver.h.

◆ psa_drv_entropy_get_bits_t

typedef psa_status_t(* psa_drv_entropy_get_bits_t) (void *p_context, uint8_t *p_buffer, uint32_t buffer_size, uint32_t *p_received_entropy_bits)

Get a specified number of bits from the entropy source.

It retrives buffer_size bytes of data from the entropy source. The entropy source will always fill the provided buffer to its full size, however, most entropy sources have biases, and the actual amount of entropy contained in the buffer will be less than the number of bytes. The driver will return the actual number of bytes of entropy placed in the buffer in p_received_entropy_bytes. A PSA Crypto API implementation will likely feed the output of this function into a Digital Random Bit Generator (DRBG), and typically has a minimum amount of entropy that it needs. To accomplish this, the PSA Crypto implementation should be designed to call this function multiple times until it has received the required amount of entropy from the entropy source.