ble_ead.h

/*
 * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Unlicense OR CC0-1.0
 */
 
#ifndef H_BLE_EAD_
#define H_BLE_EAD_
 
#include "nimble/porting/nimble/include/os/queue.h"
#include <inttypes.h>
#include "nimble/porting/nimble/include/syscfg/syscfg.h"
#include "nimble/nimble/host/include/host/ble_gap.h"
#ifdef __cplusplus
extern "C" {
#endif
 
#if MYNEWT_VAL(ENC_ADV_DATA)
 
#define BLE_EAD_RANDOMIZER_SIZE     5
 
#define BLE_EAD_KEY_SIZE            16
 
#define BLE_EAD_IV_SIZE             8
 
#define BLE_EAD_MIC_SIZE            4
 
#define BLE_EAD_NONCE_SIZE 13
 
/* This value is used to set the directionBit of the CCM  nonce to the MSB of the Randomizer field
 * (see Supplement to the Bluetooth Core Specification v11, Part A 1.23.3)
 */
#define BLE_EAD_RANDOMIZER_DIRECTION_BIT 7
 
#define BLE_EAD_AAD_SIZE 1
 
 
#define BLE_EAD_ENCRYPTED_PAYLOAD_SIZE(payload_size)                                                \
    ((payload_size) + BLE_EAD_RANDOMIZER_SIZE + BLE_EAD_MIC_SIZE)
 
#define BLE_EAD_DECRYPTED_PAYLOAD_SIZE(encrypted_payload_size)                                      \
    ((encrypted_payload_size) - (BLE_EAD_RANDOMIZER_SIZE + BLE_EAD_MIC_SIZE))
 
struct key_material {
    uint8_t session_key[BLE_EAD_KEY_SIZE];
    uint8_t iv[BLE_EAD_IV_SIZE];
};
 
int ble_ead_encrypt(const uint8_t session_key[BLE_EAD_KEY_SIZE],
                    const uint8_t iv[BLE_EAD_IV_SIZE], const uint8_t *payload,
                    size_t payload_size, uint8_t *encrypted_payload);
 
int ble_ead_decrypt(const uint8_t session_key[BLE_EAD_KEY_SIZE],
                    const uint8_t iv[BLE_EAD_IV_SIZE], const uint8_t *encrypted_payload,
                    size_t encrypted_payload_size, uint8_t *payload);
 
int ble_ead_serialize_data(const struct enc_adv_data *input, uint8_t *output);
 
#endif /* ENC_ADV_DATA */
 
#ifdef __cplusplus
}
#endif
 
#endif