Provides APIs to use with ATSHA206A device. More...

#include <stdlib.h>
#include <stdio.h>
#include "cryptoauthlib.h"
#include "api_206a.h"

Functions
ATCA_STATUS	sha206a_diversify_parent_key (uint8_t parent_key, uint8_t diversified_key)
	Computes the diversified key based on the parent key provided and device serial number.

ATCA_STATUS	sha206a_generate_derive_key (uint8_t parent_key, uint8_t derived_key, uint8_t param1, uint16_t param2)
	Generates the derived key based on the parent key and other parameters provided.

ATCA_STATUS	sha206a_generate_challenge_response_pair (uint8_t key, uint8_t challenge, uint8_t *response)
	Generates the response based on Key and Challenge provided.

ATCA_STATUS	sha206a_authenticate (uint8_t challenge, uint8_t expected_response, uint8_t *is_authenticated)
	verifies the challenge and provided response using key in device

ATCA_STATUS	sha206a_verify_device_consumption (uint8_t *is_consumed)
	verifies the device is fully consumed or not based on Parent and Derived Key use flags.

ATCA_STATUS	sha206a_check_dk_useflag_validity (uint8_t *is_consumed)
	verifies Derived Key use flags for consumption

ATCA_STATUS	sha206a_check_pk_useflag_validity (uint8_t *is_consumed)
	verifies Parent Key use flags for consumption

ATCA_STATUS	sha206a_get_dk_useflag_count (uint8_t *dk_available_count)
	calculates available Derived Key use counts

ATCA_STATUS	sha206a_get_pk_useflag_count (uint8_t *pk_available_count)
	calculates available Parent Key use counts

ATCA_STATUS	sha206a_get_dk_update_count (uint8_t *dk_update_count)
	Read Derived Key slot update count. It will be wraps around 256.

ATCA_STATUS	sha206a_write_data_store (uint8_t slot, uint8_t *data, uint8_t block, uint8_t offset, uint8_t len, bool lock_after_write)
	Update the data store slot with user data and lock it if necessary.

ATCA_STATUS	sha206a_read_data_store (uint8_t slot, uint8_t *data, uint8_t offset, uint8_t len)
	Read the data stored in Data store.

ATCA_STATUS	sha206a_get_data_store_lock_status (uint8_t slot, uint8_t *is_locked)
	Returns the lock status of the given data store.

Detailed Description

Provides APIs to use with ATSHA206A device.

Copyright: (c) 2015-2020 Microchip Technology Inc. and its subsidiaries.

Function Documentation

◆ sha206a_authenticate()

ATCA_STATUS sha206a_authenticate	(	uint8_t *	challenge,
		uint8_t *	expected_response,
		uint8_t *	is_authenticated
	)

verifies the challenge and provided response using key in device

Parameters

[in]	challenge	Challenge to be used in the response calculations
[in]	expected_response	Expected response from the device.
[out]	is_authenticated	result of expected of response and calcualted response

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_check_dk_useflag_validity()

ATCA_STATUS sha206a_check_dk_useflag_validity ( uint8_t * is_consumed )

verifies Derived Key use flags for consumption

Parameters

[out] is_consumed indicates if DK is available for consumption.

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_check_pk_useflag_validity()

ATCA_STATUS sha206a_check_pk_useflag_validity ( uint8_t * is_consumed )

verifies Parent Key use flags for consumption

Parameters

[out] is_consumed indicates if PK is available for consumption

Returns: ATCA_SUCCESS on success, otherwise an error code

◆ sha206a_diversify_parent_key()

ATCA_STATUS sha206a_diversify_parent_key	(	uint8_t *	parent_key,
		uint8_t *	diversified_key
	)

Computes the diversified key based on the parent key provided and device serial number.

Parameters

[in]	parent_key	parent key to be diversified
[out]	diversified_key	diversified parent key

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_generate_challenge_response_pair()

ATCA_STATUS sha206a_generate_challenge_response_pair	(	uint8_t *	key,
		uint8_t *	challenge,
		uint8_t *	response
	)

Generates the response based on Key and Challenge provided.

Parameters

[in]	key	Input data contains device's key
[in]	challenge	Input data to be used in challenge response calculation
[out]	response	response derived from key and challenge

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_generate_derive_key()

ATCA_STATUS sha206a_generate_derive_key	(	uint8_t *	parent_key,
		uint8_t *	derived_key,
		uint8_t	param1,
		uint16_t	param2
	)

Generates the derived key based on the parent key and other parameters provided.

Parameters

[in]	parent_key	Input data contains device's parent key
[out]	derived_key	Output data derived from parent key
[in]	param1	Input data to be used in derive key calculation
[in]	param2	Input data to be used in derive key calculation

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_get_data_store_lock_status()

ATCA_STATUS sha206a_get_data_store_lock_status	(	uint8_t	slot,
		uint8_t *	is_locked
	)

Returns the lock status of the given data store.

Parameters

[in]	slot	Slot number of the data store
[out]	is_locked	lock status of the data store

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_get_dk_update_count()

ATCA_STATUS sha206a_get_dk_update_count ( uint8_t * dk_update_count )

Read Derived Key slot update count. It will be wraps around 256.

Parameters

[out] dk_update_count returns number of times the slot has been updated with derived key

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_get_dk_useflag_count()

ATCA_STATUS sha206a_get_dk_useflag_count ( uint8_t * dk_available_count )

calculates available Derived Key use counts

Parameters

[out] dk_available_count counts available bit's as 1

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_get_pk_useflag_count()

ATCA_STATUS sha206a_get_pk_useflag_count ( uint8_t * pk_available_count )

calculates available Parent Key use counts

Parameters

[out] pk_available_count counts available bit's as 1

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_read_data_store()

ATCA_STATUS sha206a_read_data_store	(	uint8_t	slot,
		uint8_t *	data,
		uint8_t	offset,
		uint8_t	len
	)

Read the data stored in Data store.

Parameters

[in]	slot	Slot number to read from
[in]	data	Pointer to hold slot data data
[in]	offset	Byte offset within the zone to read from.
[in]	len	data length

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_verify_device_consumption()

ATCA_STATUS sha206a_verify_device_consumption ( uint8_t * is_consumed )

verifies the device is fully consumed or not based on Parent and Derived Key use flags.

Parameters

[out] is_consumed result of device consumption

Returns: ATCA_SUCCESS on success, otherwise an error code.

◆ sha206a_write_data_store()

ATCA_STATUS sha206a_write_data_store	(	uint8_t	slot,
		uint8_t *	data,
		uint8_t	block,
		uint8_t	offset,
		uint8_t	len,
		bool	lock_after_write
	)

Update the data store slot with user data and lock it if necessary.

Parameters

[in]	slot	Slot number to be written with data
[in]	data	Pointer that holds the data
[in]	block	32-byte block to write to.
[in]	offset	4-byte word within the specified block to write to. If performing a 32-byte write, this should be 0.
[in]	len	data length
[in]	lock_after_write	set 1 to lock slot after write, otherwise 0

Returns: ATCA_SUCCESS on success, otherwise an error code.

Functions

Detailed Description

Function Documentation

◆ sha206a_authenticate()

◆ sha206a_check_dk_useflag_validity()

◆ sha206a_check_pk_useflag_validity()

◆ sha206a_diversify_parent_key()

◆ sha206a_generate_challenge_response_pair()

◆ sha206a_generate_derive_key()

◆ sha206a_get_data_store_lock_status()

◆ sha206a_get_dk_update_count()

◆ sha206a_get_dk_useflag_count()

◆ sha206a_get_pk_useflag_count()

◆ sha206a_read_data_store()

◆ sha206a_verify_device_consumption()

◆ sha206a_write_data_store()