subsys/bluetooth/crypto/bt_crypto_tc.c

/* Copyright (c) 2022 Nordic Semiconductor ASA
 * SPDX-License-Identifier: Apache-2.0
 */

#include <errno.h>
#include <string.h>

#include <zephyr/sys/byteorder.h>

#include <tinycrypt/cmac_mode.h>
#include <tinycrypt/constants.h>

#include "common/bt_str.h"
#include "bt_crypto.h"

int bt_crypto_aes_cmac(const uint8_t *key, const uint8_t *in, size_t len, uint8_t *out)
{
	struct tc_aes_key_sched_struct sched;
	struct tc_cmac_struct state;

	if (tc_cmac_setup(&state, key, &sched) == TC_CRYPTO_FAIL) {
		return -EIO;
	}

	if (tc_cmac_update(&state, in, len) == TC_CRYPTO_FAIL) {
		return -EIO;
	}

	if (tc_cmac_final(out, &state) == TC_CRYPTO_FAIL) {
		return -EIO;
	}

	return 0;
}