cc2538 AES-CTR

Driver for the cc2538 AES-CTR mode of the security core. More...

Files
file	ctr.c
	Implementation of the cc2538 AES-CTR driver.
file	ctr.h
	Header file for the cc2538 AES-CTR driver.

AES-CTR functions
uint8_t	ctr_crypt_start (uint8_t encrypt, uint8_t key_area, const void *nonce, const void *ictr, uint8_t ctr_len, const void *mdata_in, void *mdata_out, uint16_t mdata_len, struct process *process)
	Starts a CTR crypto operation. More...
int8_t	ctr_crypt_check_status (void)
	Checks the status of the CTR crypto operation. More...

Detailed Description

Driver for the cc2538 AES-CTR mode of the security core.

Function Documentation

int8_t ctr_crypt_check_status

(

void

)

Checks the status of the CTR crypto operation.

Returns

CRYPTO_PENDING if operation still pending, CRYPTO_SUCCESS if successful, or CRYPTO/AES/CTR error code

Note

This function must be called only after ctr_crypt_start().

Definition at line 71 of file ctr.c.

References aes_auth_crypt_check_status(), aes_auth_crypt_get_result(), and NULL.

uint8_t ctr_crypt_start	(	uint8_t	encrypt,
		uint8_t	key_area,
		const void *	nonce,
		const void *	ictr,
		uint8_t	ctr_len,
		const void *	mdata_in,
		void *	mdata_out,
		uint16_t	mdata_len,
		struct process *	process
	)

Starts a CTR crypto operation.

Parameters

encrypt	true to encrypt, or false to decrypt
key_area	Area in Key RAM where the key is stored (0 to AES_KEY_AREAS - 1)
nonce	Pointer to nonce (AES_IV_LEN - ctr_len octets), or NULL
ictr	Pointer to initial counter
ctr_len	Length of counter in octets (4, 8, 12, or 16)
mdata_in	Pointer to input message in SRAM
mdata_out	Pointer to output message in SRAM (may be mdata_in)
mdata_len	Length of message in octets
process	Process to be polled upon completion of the operation, or NULL

Returns

CRYPTO_SUCCESS if successful, or CRYPTO/AES/CTR error code

Definition at line 46 of file ctr.c.

References AES_AES_CTRL_CTR, AES_AES_CTRL_CTR_WIDTH_S, AES_AES_CTRL_DIRECTION_ENCRYPT, aes_auth_crypt_start(), and NULL.