BLESecurity.cpp

/*
 * BLESecurity.cpp
 *
 *  Created on: Dec 17, 2017
 *      Author: chegewara
 */

#include "BLESecurity.h"
#include "sdkconfig.h"
#if defined(CONFIG_BT_ENABLED)

BLESecurity::BLESecurity() {
}

BLESecurity::~BLESecurity() {
}
/*
 * @brief Set requested authentication mode
 */
void BLESecurity::setAuthenticationMode(esp_ble_auth_req_t auth_req) {
	m_authReq = auth_req;
	esp_ble_gap_set_security_param(ESP_BLE_SM_AUTHEN_REQ_MODE, &m_authReq, sizeof(uint8_t));		  // <--- setup requested authentication mode
}

/**
 * @brief 	Set our device IO capability to let end user perform authorization
 * 			either by displaying or entering generated 6-digits pin code
 */
void BLESecurity::setCapability(esp_ble_io_cap_t iocap) {
	m_iocap = iocap;
	esp_ble_gap_set_security_param(ESP_BLE_SM_IOCAP_MODE, &iocap, sizeof(uint8_t));
} // setCapability


/**
 * @brief Init encryption key by server
 * @param key_size is value between 7 and 16
 */
void BLESecurity::setInitEncryptionKey(uint8_t init_key) {
	m_initKey = init_key;
	esp_ble_gap_set_security_param(ESP_BLE_SM_SET_INIT_KEY, &m_initKey, sizeof(uint8_t));
} // setInitEncryptionKey


/**
 * @brief Init encryption key by client
 * @param key_size is value between 7 and 16
 */
void BLESecurity::setRespEncryptionKey(uint8_t resp_key) {
	m_respKey = resp_key;
	esp_ble_gap_set_security_param(ESP_BLE_SM_SET_RSP_KEY, &m_respKey, sizeof(uint8_t));
} // setRespEncryptionKey


/**
 *
 *
 */
void BLESecurity::setKeySize(uint8_t key_size) {
	m_keySize = key_size;
	esp_ble_gap_set_security_param(ESP_BLE_SM_MAX_KEY_SIZE, &m_keySize, sizeof(uint8_t));
} //setKeySize

/**
 * Setup for static PIN connection, call it first and then call setAuthenticationMode eventually to change it
 */
void BLESecurity::setStaticPIN(uint32_t pin){
    uint32_t passkey = pin;
    esp_ble_gap_set_security_param(ESP_BLE_SM_SET_STATIC_PASSKEY, &passkey, sizeof(uint32_t));
	setCapability(ESP_IO_CAP_OUT);
	setKeySize();
	setAuthenticationMode(ESP_LE_AUTH_REQ_SC_ONLY);
	setInitEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK);
}

/**
 * @brief Debug function to display what keys are exchanged by peers
 */
char* BLESecurity::esp_key_type_to_str(esp_ble_key_type_t key_type) {
	char* key_str = nullptr;
	switch (key_type) {
		case ESP_LE_KEY_NONE:
			key_str = (char*) "ESP_LE_KEY_NONE";
			break;
		case ESP_LE_KEY_PENC:
			key_str = (char*) "ESP_LE_KEY_PENC";
			break;
		case ESP_LE_KEY_PID:
			key_str = (char*) "ESP_LE_KEY_PID";
			break;
		case ESP_LE_KEY_PCSRK:
			key_str = (char*) "ESP_LE_KEY_PCSRK";
			break;
		case ESP_LE_KEY_PLK:
			key_str = (char*) "ESP_LE_KEY_PLK";
			break;
		case ESP_LE_KEY_LLK:
			key_str = (char*) "ESP_LE_KEY_LLK";
			break;
		case ESP_LE_KEY_LENC:
			key_str = (char*) "ESP_LE_KEY_LENC";
			break;
		case ESP_LE_KEY_LID:
			key_str = (char*) "ESP_LE_KEY_LID";
			break;
		case ESP_LE_KEY_LCSRK:
			key_str = (char*) "ESP_LE_KEY_LCSRK";
			break;
		default:
			key_str = (char*) "INVALID BLE KEY TYPE";
			break;
	}
	return key_str;
} // esp_key_type_to_str
#endif // CONFIG_BT_ENABLED