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# 创建用于安全存储的自定义证书处理程序
<a name="managedintegrations-sdk-v2-cookbook-certhandler"></a>

在加入托管集成中心时，设备证书管理至关重要。虽然默认情况下证书存储在文件系统中，但您可以创建自定义证书处理程序以增强安全性和灵活的凭据管理。

托管集成 End device SDK 为安全存储接口提供了证书处理程序，您可以将其实现为共享对象 (.so) 库。构建安全存储实现以读取和写入证书，然后在运行时将库文件链接到 HubOnboarding 进程。

## API 定义和组件
<a name="managedintegrations-sdk-v2-cookbook-certhandler-api"></a>

查看以下`secure_storage_cert_handler_interface.hpp`文件，了解您的实现的 API 组件和要求

**Topics**
+ [API 定义](#managedintegrations-sdk-v2-cookbook-certhandler-apidef)
+ [关键组件](#managedintegrations-sdk-v2-cookbook-certhandler-apicomp)

### API 定义
<a name="managedintegrations-sdk-v2-cookbook-certhandler-apidef"></a>

**`secure_storage_cert_hander_interface.hpp` 的内容**

```
/* 
    * Copyright 2024 Amazon.com, Inc. or its affiliates. All rights reserved. 
    *
    * AMAZON PROPRIETARY/CONFIDENTIAL 
    *
    * You may not use this file except in compliance with the terms and
    * conditions set forth in the accompanying LICENSE.txt file.
    *
    * THESE MATERIALS ARE PROVIDED ON AN "AS IS" BASIS. AMAZON SPECIFICALLY 
    * DISCLAIMS, WITH RESPECT TO THESE MATERIALS, ALL WARRANTIES, EXPRESS, 
    * IMPLIED, OR STATUTORY, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY, 
    * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. 
    */ 
    #ifndef SECURE_STORAGE_CERT_HANDLER_INTERFACE_HPP
    #define SECURE_STORAGE_CERT_HANDLER_INTERFACE_HPP 
    
    #include <iostream>
    #include <memory>
    
    namespace IoTManagedIntegrationsDevice { 
    namespace CertHandler {
    /**
     * @enum CERT_TYPE_T
     * @brief enumeration defining certificate types. 
     */ 
     typedef enum { CLAIM = 0, DHA = 1, PERMANENT = 2 } CERT_TYPE_T;
     class SecureStorageCertHandlerInterface {
      public:
       /** 
        * @brief Read certificate and private key value of a particular certificate
        * type from secure storage.
        */ 
        virtual bool read_cert_and_private_key(const CERT_TYPE_T cert_type, 
                                              std::string &cert_value, 
                                              std::string &private_key_value) = 0; 
        /** 
          * @brief Write permanent certificate and private key value to secure storage.
          */
        virtual bool write_permanent_cert_and_private_key(
            std::string_view cert_value, std::string_view private_key_value) = 0; 
        };
        std::shared_ptr<SecureStorageCertHandlerInterface> createSecureStorageCertHandler();
    } //namespace CertHandler
    } //namespace IoTManagedIntegrationsDevice
  
    #endif //SECURE_STORAGE_CERT_HANDLER_INTERFACE_HPP
```

### 关键组件
<a name="managedintegrations-sdk-v2-cookbook-certhandler-apicomp"></a>
+ CERT\_TYPE\_T-集线器上不同类型的证书。
  + CLAIM-最初在集线器上的索赔证书将兑换成永久证书。
  + DHA-暂时未使用。
  + 永久-用于连接托管集成端点的永久证书。
+ read\_cert\_and\_private\_key-（函数待实现）将证书和密钥值读入参考输入。此函数必须能够读取 CLAIM 和永久证书，并根据上述证书类型进行区分。
+ write\_permanent\_cert\_and\_private\_key-（函数待实现）将永久证书和密钥值写入所需的位置。

## 示例构建
<a name="managedintegrations-sdk-v2-cookbook-exbuild"></a>

将内部实现标头与公共接口 (`secure_storage_cert_handler_interface.hpp`) 分开，以保持干净的项目结构。通过这种分离，您可以在构建证书处理程序的同时管理公用和私有组件。

**注意**  
宣布`secure_storage_cert_handler_interface.hpp`为公开。

**Topics**
+ [项目结构](#managedintegrations-sdk-v2-cookbook-proj)
+ [继承接口](#managedintegrations-sdk-v2-cookbook-interface)
+ [实施](#managedintegrations-sdk-v2-cookbook-interimpl)
+ [CMakeList.txt](#managedintegrations-sdk-v2-cookbook-cmakelist)

### 项目结构
<a name="managedintegrations-sdk-v2-cookbook-proj"></a>

![托管集成证书处理程序项目结构。](http://docs.aws.amazon.com/zh_cn/iot-mi/latest/devguide/images/iot-managedintegrations-cert-handler-projstruct.png)


### 继承接口
<a name="managedintegrations-sdk-v2-cookbook-interface"></a>

创建一个继承接口的具体类。将此头文件和其他文件隐藏在单独的目录下，以便在构建时可以轻松区分私有和公共标头。

```
#ifndef IOTMANAGEDINTEGRATIONSDEVICE_SDK_STUB_SECURE_STORAGE_CERT_HANDLER_HPP
  #define IOTMANAGEDINTEGRATIONSDEVICE_SDK_STUB_SECURE_STORAGE_CERT_HANDLER_HPP 
  
  #include "secure_storage_cert_handler_interface.hpp" 
  
  namespace IoTManagedIntegrationsDevice::CertHandler { 
    class StubSecureStorageCertHandler : public SecureStorageCertHandlerInterface { 
      public:
        StubSecureStorageCertHandler() = default; 
        
        bool read_cert_and_private_key(const CERT_TYPE_T cert_type,
                                      std::string &cert_value, 
                                      std::string &private_key_value) override; 
                                      
        bool write_permanent_cert_and_private_key(
            std::string_view cert_value, std::string_view private_key_value) override; 
            /*
            * any other resource for function you might need 
            */
            
            
          }; 
      } 
    #endif //IOTMANAGEDINTEGRATIONSDEVICE_SDK_STUB_SECURE_STORAGE_CERT_HANDLER_HPP
```

### 实施
<a name="managedintegrations-sdk-v2-cookbook-interimpl"></a>

实现上面定义的存储类，`src/stub_secure_storage_cert_handler.cpp`。

```
/* 
  * Copyright 2024 Amazon.com, Inc. or its affiliates. All rights reserved. 
  * 
  * AMAZON PROPRIETARY/CONFIDENTIAL 
  *
  * You may not use this file except in compliance with the terms and
  * conditions set forth in the accompanying LICENSE.txt file. 
  * 
  * THESE MATERIALS ARE PROVIDED ON AN "AS IS" BASIS. AMAZON SPECIFICALLY 
  * DISCLAIMS, WITH RESPECT TO THESE MATERIALS, ALL WARRANTIES, EXPRESS, 
  * IMPLIED, OR STATUTORY, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY, 
  * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. 
  */

  #include "stub_secure_storage_cert_handler.hpp" 
  
  using namespace IoTManagedIntegrationsDevice::CertHandler;
  
  bool StubSecureStorageCertHandler::write_permanent_cert_and_private_key( 
              std::string_view cert_value, std::string_view private_key_value) { 
            // TODO: implement write function 
            return true;
  }
  
  bool StubSecureStorageCertHandler::read_cert_and_private_key(const CERT_TYPE_T cert_type, 
                                                          std::string &cert_value,
                                                          std::string &private_key_value) {
          std::cout<<"Using Stub Secure Storage Cert Handler, returning dummy values";
          cert_value = "StubCertVal"; 
          private_key_value = "StubKeyVal"; 
          // TODO: implement read function 
          return true;
  }
```

实现接口中定义的工厂函数`src/secure_storage_cert_handler.cpp`。

```
#include "stub_secure_storage_cert_handler.hpp"
        
        std::shared_ptr<IoTManagedIntegrationsDevice::CertHandler::SecureStorageCertHandlerInterface>
        IoTManagedIntegrationsDevice::CertHandler::createSecureStorageCertHandler() { 
          // TODO: replace with your implementation 
        return std::make_shared<IoTManagedIntegrationsDevice::CertHandler::StubSecureStorageCertHandler>(); 
      }
```

### CMakeList.txt
<a name="managedintegrations-sdk-v2-cookbook-cmakelist"></a>

```
#project name must stay the same
      project(SecureStorageCertHandler) 
      
      # Public Header files. The interface definition must be in top level with exactly the same name 
      #ie. Not in anotherDir/secure_storage_cert_hander_interface.hpp 
      set(PUBLIC_HEADERS
                ${PROJECT_SOURCE_DIR}/include 
      )
      
      # private implementation headers.
      set(PRIVATE_HEADERS 
                ${PROJECT_SOURCE_DIR}/internal/stub 
      )
      
      #set all sources 
      set(SOURCES 
                ${PROJECT_SOURCE_DIR}/src/secure_storage_cert_handler.cpp 
                ${PROJECT_SOURCE_DIR}/src/stub_secure_storage_cert_handler.cpp 
        )
        
      # Create the shared library
      add_library(${PROJECT_NAME} SHARED ${SOURCES})
      target_include_directories( 
                ${PROJECT_NAME} 
                PUBLIC
                    ${PUBLIC_HEADERS} 
                PRIVATE 
                    ${PRIVATE_HEADERS}
      )
      
      # Set the library output location. Location can be customized but version must stay the same
      set_target_properties(${PROJECT_NAME} PROPERTIES 
                LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/../lib 
                VERSION 1.0 
                SOVERSION 1
      )
      
      # Install rules
      install(TARGETS ${PROJECT_NAME} 
                LIBRARY DESTINATION lib 
                ARCHIVE DESTINATION lib 
      )
      
      install(FILES ${HEADERS} 
                DESTINATION include/SecureStorageCertHandler
      )
```

## 使用量
<a name="managedintegrations-sdk-v2-cookbook-certhandler-usage"></a>

编译完成后，您将拥有一个`libSecureStorageCertHandler.so`共享的对象库文件及其关联的符号链接。将库文件和符号链接复制到 HubOnboarding 二进制文件所需的库位置。

**Topics**
+ [重要注意事项](#managedintegrations-sdk-v2-cookbook-certhandler-useconsider)
+ [使用安全存储](#managedintegrations-sdk-v2-cookbook-certhandler-usagehowto)

### 重要注意事项
<a name="managedintegrations-sdk-v2-cookbook-certhandler-useconsider"></a>
+ 验证您的用户帐户是否具有 HubOnboarding 二进制文件和`libSecureStorageCertHandler.so`库的读写权限。
+ 保留`secure_storage_cert_handler_interface.hpp`为唯一的公共头文件。所有其他头文件都应保留在您的私有实现中。
+ 验证您的共享对象库名称。在构建时`libSecureStorageCertHandler.so`， HubOnboarding 可能需要在文件名中使用特定的版本，例如`libSecureStorageCertHandler.so.1.0`。使用`ldd`命令检查库依赖关系并根据需要创建符号链接。
+ 如果共享库的实现具有外部依赖关系，请将其存储在 HubOnboarding 可以访问的目录中，例如`/usr/lib or the iotmi_common`目录。

### 使用安全存储
<a name="managedintegrations-sdk-v2-cookbook-certhandler-usagehowto"></a>

通过将`iot_claim_cert_path`和`iot_claim_pk_path`都设置为来更新您的`iotmi_config.json`文件**SECURE\_STORAGE**。

```
{
  "ro": { 
    "iot_provisioning_method": "FLEET_PROVISIONING", 
    "iot_claim_cert_path": "SECURE_STORAGE",
    "iot_claim_pk_path": "SECURE_STORAGE", 
    "fp_template_name": "device-integration-example",
    "iot_endpoint_url": "[{{ACCOUNT-PREFIX}}]-ats.iot.{{AWS-REGION}}.amazonaws.com", 
    "SN": "1234567890", 
    "UPC": "1234567890" 
  },
  "rw": { 
    "iot_provisioning_state": "NOT_PROVISIONED"
  }
}
```