esp-idf/components/bt/bluedroid/api/include/esp_sec_api.h

#ifndef __ESP_SEC_API_H__
#define __ESP_SEC_API_H__

#include "bt_types.h"

#define APP_SEC_IRK_FLAG        (0)
#define RAND_NB_LEN         0x08
#define SEC_KEY_LEN			0x10
 
 /*
  * STRUCTURES DEFINITIONS
  ****************************************************************************************
  */

 
 /// Generic Security key structure
typedef struct 
 {
	 /// Key value MSB -> LSB
	 UINT8 key[SEC_KEY_LEN];
 }smp_sec_key;

 ///Random number structure
typedef struct 
{
    ///8-byte array for random number
    UINT8     nb[RAND_NB_LEN];
}rand_nb;
 
 typedef struct 
 {
	 // LTK
	 smp_sec_key ltk;
	 // Random Number
	 rand_nb rand_nb;
	 // EDIV
	 UINT16 ediv;
	 // LTK key size
	 UINT8 key_size;
	 
	 // Last paired peer address type 
	 UINT8 peer_addr_type;
	 // Last paired peer address 
	 BD_ADDR peer_addr;
	 
	 // authentication level
	 UINT8 auth;
 
 }tAPP_SEC_ENV;

 extern tAPP_SEC_ENV app_sec_env;

 /*
 * GLOBAL FUNCTIONS DECLARATIONS
 ****************************************************************************************
 */

void app_ble_sec_init(void);

void app_ble_sec_pairing_cmp_evt_send(UINT8);

UINT32 app_ble_sec_gen_tk(void);

void app_ble_sec_gen_ltk(UINT8 key_size);

void app_ble_security_start(void);

#endif /* __ESP_SEC_API_H__ */