High-level security tool box.

High-level security tool box for ARM7 with crypto engine (SAM7XC)

#include <string.h>
#include "pal.h"
#include "tal.h"
#include "ieee_const.h"
#include "stb.h"
#include "sal.h"
#include "stb_internal.h"

Macros
#define	NO_HDR_MIC (0x00)

Functions
stb_ccm_t	stb_ccm_secure (uint8_t buffer, uint8_t nonce[AES_BLOCKSIZE], uint8_t key, uint8_t hdr_len, uint8_t pld_len, uint8_t sec_level, uint8_t aes_dir)
	Secure one block with CCM*. More...

void	stb_init (void)
	STB Initialization. More...

void	stb_restart (void)
	STB Restart. More...

Variables
static bool	key_change = true

static uint8_t	last_key [AES_BLOCKSIZE]

static bool	stb_restart_required = false

#define NO_HDR_MIC (0x00)

stb_ccm_t stb_ccm_secure	(	uint8_t *	buffer,
		uint8_t	nonce[AES_BLOCKSIZE],
		uint8_t *	key,
		uint8_t	hdr_len,
		uint8_t	pld_len,
		uint8_t	sec_level,
		uint8_t	aes_dir
	)

Secure one block with CCM*.

This functions secures one block with CCM* according to 802.15.4.

Parameters

[in,out]	buffer	Input: plaintext header and payload concatenated; for encryption: MUST HAVE 'AES_BLOCKSIZE' BYTES SPACE AT THE END FOR THE MIC! Output: frame secured (with MIC at end)/unsecured
[in]	nonce	The nonce: Initialization Vector (IV) as used in cryptography; the ZigBee nonce (13 bytes long) are the bytes 2...14 of this nonce
[in]	key	The key to be used; if NULL, use the current key
[in]	hdr_len	Length of plain text header (will not be encrypted)
[in]	pld_len	Length of payload to be encrypted; if 0, then only MIC authentication implies
[in]	sec_level	Security level according to IEEE 802.15.4, 7.6.2.2.1, Table 95: the value may be 0 ... 7; the two LSBs contain the MIC length in bytes (0, 4, 8 or 16); bit 2 indicates whether encryption applies or not
[in]	aes_dir	AES_DIR_ENCRYPT if secure, AES_DIR_DECRYPT if unsecured