ead.h

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/* Copyright (c) 2023 Nordic Semiconductor ASA
 * SPDX-License-Identifier: Apache-2.0
 */
 
#include <stddef.h>
#include <stdint.h>
 
#include <zephyr/kernel.h>
#include <zephyr/bluetooth/bluetooth.h>
 
#define BT_EAD_RANDOMIZER_SIZE 5
#define BT_EAD_KEY_SIZE        16
#define BT_EAD_IV_SIZE         8
#define BT_EAD_MIC_SIZE        4
 
#define BT_EAD_ENCRYPTED_PAYLOAD_SIZE(payload_size)                                                \
        ((payload_size) + BT_EAD_RANDOMIZER_SIZE + BT_EAD_MIC_SIZE)
 
#define BT_EAD_DECRYPTED_PAYLOAD_SIZE(encrypted_payload_size)                                      \
        ((encrypted_payload_size) - (BT_EAD_RANDOMIZER_SIZE + BT_EAD_MIC_SIZE))
 
int bt_ead_encrypt(const uint8_t session_key[BT_EAD_KEY_SIZE], const uint8_t iv[BT_EAD_IV_SIZE],
                   const uint8_t *payload, size_t payload_size, uint8_t *encrypted_payload);
 
int bt_ead_decrypt(const uint8_t session_key[BT_EAD_KEY_SIZE], const uint8_t iv[BT_EAD_IV_SIZE],
                   const uint8_t *encrypted_payload, size_t encrypted_payload_size,
                   uint8_t *payload);