Bluedroid BLE local and Peer Long Term Key LTK
Posted: Sat Nov 09, 2024 12:08 pm
Hi,
I want to read and print Local and peer Long Term Key (LTK).
On searching, got to know Local LTK structure is esp_ble_lenc_keys_t and Peer LTK structure is esp_ble_penc_keys_t.
But when i try to print Local LTK in ESP_GAP_BLE_AUTH_CMPL_EVT event.
The output is all 00.
Similarly for Peer LTK,
Please suggest correct procedure to get Long term Key. Below are my security configurations.
Thank you.
I want to read and print Local and peer Long Term Key (LTK).
On searching, got to know Local LTK structure is esp_ble_lenc_keys_t and Peer LTK structure is esp_ble_penc_keys_t.
But when i try to print Local LTK in ESP_GAP_BLE_AUTH_CMPL_EVT event.
Code: Select all
esp_log_buffer_hex(GATTS_TABLE_TAG, (void *)param->ble_security.ble_key.p_key_value.lenc_key.ltk, sizeof(esp_bt_octet16_t));Similarly for Peer LTK,
Code: Select all
param->ble_security.auth_cmpl.key- esp_ble_auth_req_t auth_req = ESP_LE_AUTH_REQ_SC_MITM_BOND; //bonding with peer device after authentication
- esp_ble_io_cap_t iocap = ESP_IO_CAP_OUT; //set the IO capability to No output No input
- uint8_t key_size = 16; //the key size should be 7~16 bytes
- uint8_t init_key = ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK;
- uint8_t rsp_key = ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK;
- //set static passkey
- uint32_t passkey = 123456;
- uint8_t auth_option = ESP_BLE_ONLY_ACCEPT_SPECIFIED_AUTH_ENABLE;
- uint8_t oob_support = ESP_BLE_OOB_DISABLE;
- esp_ble_gap_set_security_param(ESP_BLE_SM_SET_STATIC_PASSKEY, &passkey, sizeof(uint32_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_AUTHEN_REQ_MODE, &auth_req, sizeof(uint8_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_IOCAP_MODE, &iocap, sizeof(uint8_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_MAX_KEY_SIZE, &key_size, sizeof(uint8_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_ONLY_ACCEPT_SPECIFIED_SEC_AUTH, &auth_option, sizeof(uint8_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_OOB_SUPPORT, &oob_support, sizeof(uint8_t));
- /* If your BLE device acts as a Slave, the init_key means you hope which types of key of the master should distribute to you,
- and the response key means which key you can distribute to the master;
- If your BLE device acts as a master, the response key means you hope which types of key of the slave should distribute to you,
- and the init key means which key you can distribute to the slave. */
- esp_ble_gap_set_security_param(ESP_BLE_SM_SET_INIT_KEY, &init_key, sizeof(uint8_t));
- esp_ble_gap_set_security_param(ESP_BLE_SM_SET_RSP_KEY, &rsp_key, sizeof(uint8_t));