LTC HASH driver

Overview

This section describes the programming interface of the LTC HASH driver.

Data Structures
struct	_ltc_hash_ctx_t
	Storage type used to save hash context. More...

Macros
#define	LTC_HASH_CTX_SIZE   29
	LTC HASH Context size. More...

Typedefs
typedef enum _ltc_hash_algo_t	ltc_hash_algo_t
	Supported cryptographic block cipher functions for HASH creation.
typedef struct _ltc_hash_ctx_t	ltc_hash_ctx_t
	Storage type used to save hash context. More...

Enumerations
enum	_ltc_hash_algo_t {   kLTC_XcbcMac = 0,   kLTC_Cmac }
	Supported cryptographic block cipher functions for HASH creation. More...

Functions
status_t	LTC_HASH_Init (LTC_Type *base, ltc_hash_ctx_t *ctx, ltc_hash_algo_t algo, const uint8_t *key, uint32_t keySize)
	Initialize HASH context. More...
status_t	LTC_HASH_Update (ltc_hash_ctx_t *ctx, const uint8_t *input, uint32_t inputSize)
	Add data to current HASH. More...
status_t	LTC_HASH_Finish (ltc_hash_ctx_t *ctx, uint8_t *output, uint32_t *outputSize)
	Finalize hashing. More...
status_t	LTC_HASH (LTC_Type *base, ltc_hash_algo_t algo, const uint8_t *input, uint32_t inputSize, const uint8_t *key, uint32_t keySize, uint8_t *output, uint32_t *outputSize)
	Create HASH on given data. More...

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Data Structure Documentation

struct _ltc_hash_ctx_t

Macro Definition Documentation

#define LTC_HASH_CTX_SIZE   29

Typedef Documentation

typedef struct _ltc_hash_ctx_t ltc_hash_ctx_t

Enumeration Type Documentation

enum _ltc_hash_algo_t

Enumerator
kLTC_XcbcMac	XCBC-MAC (AES engine)
kLTC_Cmac	CMAC (AES engine)

Function Documentation

status_t LTC_HASH_Init	(	LTC_Type *	base,
		ltc_hash_ctx_t *	ctx,
		ltc_hash_algo_t	algo,
		const uint8_t *	key,
		uint32_t	keySize
	)

This function initialize the HASH. Key shall be supplied if the underlaying algoritm is AES XCBC-MAC or CMAC. Key shall be NULL if the underlaying algoritm is SHA.

For XCBC-MAC, the key length must be 16. For CMAC, the key length can be the AES key lengths supported by AES engine. For MDHA the key length argument is ignored.

Parameters

	base	LTC peripheral base address
[out]	ctx	Output hash context
	algo	Underlaying algorithm to use for hash computation.
	key	Input key (NULL if underlaying algorithm is SHA)
	keySize	Size of input key in bytes

Returns

Status of initialization

status_t LTC_HASH_Update	(	ltc_hash_ctx_t *	ctx,
		const uint8_t *	input,
		uint32_t	inputSize
	)

Add data to current HASH. This can be called repeatedly with an arbitrary amount of data to be hashed.

Parameters

[in,out]	ctx	HASH context
	input	Input data
	inputSize	Size of input data in bytes

Returns

Status of the hash update operation

status_t LTC_HASH_Finish	(	ltc_hash_ctx_t *	ctx,
		uint8_t *	output,
		uint32_t *	outputSize
	)

Outputs the final hash and erases the context.

Parameters

[in,out]	ctx	Input hash context
[out]	output	Output hash data
[out]	outputSize	Output parameter storing the size of the output hash in bytes

Returns

Status of the hash finish operation

status_t LTC_HASH	(	LTC_Type *	base,
		ltc_hash_algo_t	algo,
		const uint8_t *	input,
		uint32_t	inputSize,
		const uint8_t *	key,
		uint32_t	keySize,
		uint8_t *	output,
		uint32_t *	outputSize
	)

Perform the full keyed HASH in one function call.

Parameters

	base	LTC peripheral base address
	algo	Block cipher algorithm to use for CMAC creation
	input	Input data
	inputSize	Size of input data in bytes
	key	Input key
	keySize	Size of input key in bytes
[out]	output	Output hash data
[out]	outputSize	Output parameter storing the size of the output hash in bytes

Returns

Status of the one call hash operation.