xAN1503006_BLE静态秘钥在51822程序中的实现

BLE静态秘钥在51822程序中的实现xAN1503006Application Note V1.00类别内容关键词nRF51822；静态秘钥；摘要介绍在SDK7.1下，如何实现添加静态秘钥。

版本日期更新内容V1.00 2015-03-15 创建文档目录1概述 (3)2实现步骤 (4)免责声明 (8)1概述在使用nrf51822开发BLE应用中，很多情况下，为了提高安全性，需要使用到秘钥配对。

而有时候要实现友好的用户界面，使得手机在与51822连接时，跳出秘钥输入框，就必须使用BLE中的静态秘钥功能。

本文以experimental_ble_app_uart这个例程为基础，介绍如何在程序中实现静态秘钥的功能。

如图1-1，使用nRF UART这个app连接的效果图。

图1-1 app连接效果图2实现步骤●首先修改配对信息安全参数的值。

#define SEC_PARAM_TIMEOUT 30 /**< Timeout for Pairing Request or Security Request (in seconds). */#define SEC_PARAM_BOND 0 /**< Perform bonding. */#define SEC_PARAM_MITM 1 /**< Man In The Middle protection not required. */#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_DISPLAY_YESNO /**< Display and Yes/No entry. */#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */●通过协议栈提供的API设置秘钥（为6位字符串）static void ble_stack_init(void){uint32_t err_code;static uint8_t passkey[] = "123456";ble_opt_t ble_opt;ble_opt.gap_opt.passkey.p_passkey = &passkey[0];// Initialize SoftDevice.SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);// Enable BLE stackble_enable_params_t ble_enable_params;memset(&ble_enable_params, 0, sizeof(ble_enable_params));ble_enable_params.gatts_enable_params.service_changed = IS_SRVC_CHANGED_CHARACT_PRESENT;err_code = sd_ble_enable(&ble_enable_params);APP_ERROR_CHECK(err_code);// Subscribe for BLE events.err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);APP_ERROR_CHECK(err_code);(void) sd_ble_opt_set(BLE_GAP_OPT_PASSKEY, &ble_opt);}设置需要属性的安全等级/**@brief Function for adding RX characteristic.** @param[in] p_nus Nordic UART Service structure.* @param[in] p_nus_init Information needed to initialize the service.** @return NRF_SUCCESS on success, otherwise an error code.*/static uint32_t rx_char_add(ble_nus_t * p_nus, const ble_nus_init_t * p_nus_init){/**@snippet [Adding proprietary characteristic to S110 SoftDevice] */ ble_gatts_char_md_t char_md;ble_gatts_attr_md_t cccd_md;ble_gatts_attr_t attr_char_value;ble_uuid_t ble_uuid;ble_gatts_attr_md_t attr_md;memset(&cccd_md, 0, sizeof(cccd_md));BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);//BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&cccd_md.write_perm);cccd_md.vloc = BLE_GATTS_VLOC_STACK;memset(&char_md, 0, sizeof(char_md));char_md.char_props.notify = 1;char_md.p_char_user_desc = NULL;char_md.p_char_pf = NULL;char_md.p_user_desc_md = NULL;char_md.p_cccd_md = &cccd_md;char_md.p_sccd_md = NULL;ble_uuid.type = p_nus->uuid_type;ble_uuid.uuid = BLE_UUID_NUS_RX_CHARACTERISTIC;memset(&attr_md, 0, sizeof(attr_md));//BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&attr_md.read_perm); //BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&attr_md.write_perm);attr_md.vloc = BLE_GATTS_VLOC_STACK;attr_md.rd_auth = 0;attr_md.wr_auth = 0;attr_md.vlen = 1;memset(&attr_char_value, 0, sizeof(attr_char_value));attr_char_value.p_uuid = &ble_uuid;attr_char_value.p_attr_md = &attr_md;attr_char_value.init_len = sizeof(uint8_t);attr_char_value.init_offs = 0;attr_char_value.max_len = BLE_NUS_MAX_RX_CHAR_LEN;return sd_ble_gatts_characteristic_add(p_nus->service_handle,&char_md,&attr_char_value,&p_nus->rx_handles);/**@snippet [Adding proprietary characteristic to S110 SoftDevice] */}/**@brief Function for adding TX characteristic.** @param[in] p_nus Nordic UART Service structure.* @param[in] p_nus_init Information needed to initialize the service.** @return NRF_SUCCESS on success, otherwise an error code.*/static uint32_t tx_char_add(ble_nus_t * p_nus, const ble_nus_init_t * p_nus_init){ble_gatts_char_md_t char_md;ble_gatts_attr_t attr_char_value;ble_uuid_t ble_uuid;ble_gatts_attr_md_t attr_md;memset(&char_md, 0, sizeof(char_md));char_md.char_props.write = 1;char_md.char_props.write_wo_resp = 1;char_md.p_char_user_desc = NULL;char_md.p_char_pf = NULL;char_md.p_user_desc_md = NULL;char_md.p_cccd_md = NULL;char_md.p_sccd_md = NULL;ble_uuid.type = p_nus->uuid_type;ble_uuid.uuid = BLE_UUID_NUS_TX_CHARACTERISTIC; memset(&attr_md, 0, sizeof(attr_md));BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&attr_md.read_perm); //BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);//BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&attr_md.write_perm);attr_md.vloc = BLE_GATTS_VLOC_STACK;attr_md.rd_auth = 0;attr_md.wr_auth = 0;attr_md.vlen = 1;memset(&attr_char_value, 0, sizeof(attr_char_value));attr_char_value.p_uuid = &ble_uuid;attr_char_value.p_attr_md = &attr_md;attr_char_value.init_len = 1;attr_char_value.init_offs = 0;attr_char_value.max_len = BLE_NUS_MAX_TX_CHAR_LEN;return sd_ble_gatts_characteristic_add(p_nus->service_handle,&char_md,&attr_char_value,&p_nus->tx_handles);}免责声明深圳市蓝科迅通科技有限公司随附提供的软件或文档资料旨在提供给您（本公司的客户）使用，仅限于且只能在本公司销售的产品上使用。