📑【NDK开发】NDK采集、压缩、加密传输设备信息 密级: 【C-1】 | 创建时间:2023,11,09 10:49:44 | 目录:编程开发 | 编辑本文 ## 任务描述 希望开发一个apk。通过各种系统api、各种依赖库api，拿到尽可能全面的设备信息、环境信息以及设备指纹。并且通过数据编码、数据加密后传回服务器，进行云端存储。 ## 任务分解 信息采集：通过各类api获取数据，保存在变量池 信息编码：使用protobuf对采集的数据进行压缩 信息加密：通过自定义魔改的AES加密算法将数据流进行加密 信息回传：通过请求发送加密后数据至服务器 ## 信息采集 ```cpp std::string buildId = getSystemProperty("ro.build.id").c_str(); // 编译id std::string model = getSystemProperty("ro.product.model").c_str(); //模型 std::string manufacturer = getSystemProperty("ro.product.manufacturer").c_str(); std::string brand = getSystemProperty("ro.product.brand").c_str(); //品牌 std::string product = getSystemProperty("ro.build.product").c_str(); std::string fingerprint = getSystemProperty("ro.build.fingerprint").c_str(); //指纹 std::string baseband = getSystemProperty("vendor.gsm.project.baseband").c_str(); std::string sdkversion = getSystemProperty("ro.build.version.sdk").c_str(); ``` getSystemProperty函数定义如下，用于通过系统api获取系统属性： ```cpp extern "C" { std::string getSystemProperty(std::string key) { char Property[100]; __system_property_get(key.c_str(), Property); return Property; } } ``` ## 信息编码 如何引入protobuf? 这里踩了一天的坑，网上都是cpp的高手，没人教cmake怎么用。 首先根据自己电脑下载好一个可用的protoc可执行文件，编写person.proto规则文件 ```bash syntax = "proto3"; message Person { string name = 1; int32 age = 2; string email = 3; } ``` 执行命令 生成所需用的cpp头文件，以及cc实现文件  ### Android Studio编译protobuf 下载官方源码，建议版本<=21，否则会出现某些类库丢失的问题，需要自己再编译。 提取/src/google/protobuf 到如图所示目录  新建一个CMakeLists.txt文件，内容如下： ``` # For more information about using CMake with Android Studio, read the # documentation: https://d.android.com/studio/projects/add-native-code.html # Sets the minimum version of CMake required to build the native library. cmake_minimum_required(VERSION 3.6.0) # Creates and names a library, sets it as either STATIC # or SHARED, and provides the relative paths to its source code. # You can define multiple libraries, and CMake builds them for you. # Gradle automatically packages shared libraries with your APK. set(DANDROID_STL c++_static) set(DCMAKE_BUILD_TYPE Release) #add_definitions("-DDEBUG") add_definitions("-DHAVE_PTHREAD") include_directories(.) set(libprotobuf_files google/protobuf/any.cc google/protobuf/any.pb.cc google/protobuf/api.pb.cc google/protobuf/compiler/importer.cc google/protobuf/compiler/parser.cc google/protobuf/descriptor.cc google/protobuf/descriptor.pb.cc google/protobuf/descriptor_database.cc google/protobuf/duration.pb.cc google/protobuf/dynamic_message.cc google/protobuf/empty.pb.cc google/protobuf/extension_set_heavy.cc google/protobuf/field_mask.pb.cc google/protobuf/generated_message_bases.cc google/protobuf/generated_message_reflection.cc google/protobuf/generated_message_tctable_full.cc google/protobuf/io/gzip_stream.cc google/protobuf/io/printer.cc google/protobuf/io/tokenizer.cc google/protobuf/map_field.cc google/protobuf/message.cc google/protobuf/reflection_ops.cc google/protobuf/service.cc google/protobuf/source_context.pb.cc google/protobuf/struct.pb.cc google/protobuf/stubs/substitute.cc google/protobuf/text_format.cc google/protobuf/timestamp.pb.cc google/protobuf/type.pb.cc google/protobuf/unknown_field_set.cc google/protobuf/util/delimited_message_util.cc google/protobuf/util/field_comparator.cc google/protobuf/util/field_mask_util.cc google/protobuf/util/internal/datapiece.cc google/protobuf/util/internal/default_value_objectwriter.cc google/protobuf/util/internal/error_listener.cc google/protobuf/util/internal/field_mask_utility.cc google/protobuf/util/internal/json_escaping.cc google/protobuf/util/internal/json_objectwriter.cc google/protobuf/util/internal/json_stream_parser.cc google/protobuf/util/internal/object_writer.cc google/protobuf/util/internal/proto_writer.cc google/protobuf/util/internal/protostream_objectsource.cc google/protobuf/util/internal/protostream_objectwriter.cc google/protobuf/util/internal/type_info.cc google/protobuf/util/internal/utility.cc google/protobuf/util/json_util.cc google/protobuf/util/message_differencer.cc google/protobuf/util/time_util.cc google/protobuf/util/type_resolver_util.cc google/protobuf/wire_format.cc google/protobuf/wrappers.pb.cc google/protobuf/any_lite.cc google/protobuf/arena.cc google/protobuf/arenastring.cc google/protobuf/arenaz_sampler.cc google/protobuf/extension_set.cc google/protobuf/generated_enum_util.cc google/protobuf/generated_message_tctable_lite.cc google/protobuf/generated_message_util.cc google/protobuf/implicit_weak_message.cc google/protobuf/inlined_string_field.cc google/protobuf/io/coded_stream.cc google/protobuf/io/io_win32.cc google/protobuf/io/strtod.cc google/protobuf/io/zero_copy_stream.cc google/protobuf/io/zero_copy_stream_impl.cc google/protobuf/io/zero_copy_stream_impl_lite.cc google/protobuf/map.cc google/protobuf/message_lite.cc google/protobuf/parse_context.cc google/protobuf/repeated_field.cc google/protobuf/repeated_ptr_field.cc google/protobuf/stubs/bytestream.cc google/protobuf/stubs/common.cc google/protobuf/stubs/int128.cc google/protobuf/stubs/status.cc google/protobuf/stubs/statusor.cc google/protobuf/stubs/stringpiece.cc google/protobuf/stubs/stringprintf.cc google/protobuf/stubs/structurally_valid.cc google/protobuf/stubs/strutil.cc google/protobuf/stubs/time.cc google/protobuf/wire_format_lite.cc ) add_library( # Sets the name of the library. protobuf # Sets the library as a shared library. STATIC # Provides a relative path to your source file(s). ${libprotobuf_files} ) find_library( # Sets the name of the path variable. log-lib # log zlib-lib # z ) # Specifies libraries CMake should link to your target library. You # can link multiple libraries, such as libraries you define in this # build script, prebuilt third-party libraries, or system libraries. target_link_libraries( # Specifies the target library. protobuf z log # ${zlib-lib} # ${log-lib} ) set(ANDROID_NDK_REVISION 21) ```  编译后如果出现符号丢失的问题，肯定就是某个cc文件没有被编译导入。 ### 测试代码 ```cpp #include <jni.h> #include "native_depy.h" #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <linux/android/binder.h> #include <android/log.h> #include "person.pb.h" #define TAG "depy" // 这个是自定义的LOG的标识 #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__) #ifdef __cplusplus extern "C" #endif JNIEXPORT jstring JNICALL Java_com_example_a2023110803_MainActivity_get(JNIEnv *env, jobject thiz) { Person person; person.set_age(32); person.set_email("admin@123.com"); person.set_name("uu"); std::string data; person.SerializeToString(&data); Person person2; person2.ParseFromString(data); LOGD("version %d\n",person2.email().c_str()); return env->NewStringUTF(person2.email().c_str()); #ifdef __cplusplus } #endif ``` 运行后手机上出现admin@123.com代表protobuf引入成功。 ### 使用logcat ``` #include <android/log.h> #define TAG "depy" // 这个是自定义的LOG的标识 #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__) ```  进行cyberchef的解码，发现成功。  ## 信息加密 ### 引入openssl 引入libcrypto.a 与libssl.a  引入头文件   编译提示没问题代表可以使用，可能会飘红，但会是缓存问题，重启一下android studio就行。 ### 使用evp.h进行aes加密 evp.h已默认封装了一些方法，可以直接调用。默认的填充方式是pkcs#7。 ```cpp #include <jni.h> #include "native_depy.h" #include "device.pb.h" #include <android/log.h> #include <openssl/evp.h> #include <iostream> #include <iomanip> #include <sstream> #include <string> #include <vector> #define TAG "depy" // 这个是自定义的LOG的标识 #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__) std::string byteArrayToHexString(const std::vector<unsigned char>& byteArray) { std::stringstream ss; ss << std::hex << std::setfill('0'); for (size_t index = 0; index < byteArray.size(); ++index) { ss << std::setw(2) << static_cast<unsigned int>(byteArray[index]); } return ss.str(); } extern "C" JNIEXPORT jstring JNICALL Java_com_example_a2023110803_MainActivity_get(JNIEnv *env, jobject thiz) { //信息采集 std::string buildId = getSystemProperty("ro.build.id").c_str(); // 编译id std::string model = getSystemProperty("ro.product.model").c_str(); //模型 std::string manufacturer = getSystemProperty("ro.product.manufacturer").c_str(); std::string brand = getSystemProperty("ro.product.brand").c_str(); //品牌 std::string product = getSystemProperty("ro.build.product").c_str(); std::string fingerprint = getSystemProperty("ro.build.fingerprint").c_str(); //指纹 std::string baseband = getSystemProperty("vendor.gsm.project.baseband").c_str(); std::string sdkversion = getSystemProperty("ro.build.version.sdk").c_str(); //protobuf 编码 device device_1; device_1.set_fingerprint(fingerprint); device_1.set_product(product); device_1.set_manufacturer(manufacturer); device_1.set_model(model); device_1.set_baseband(baseband); device_1.set_buildid(buildId); device_1.set_sdkversion(sdkversion); device_1.set_brand(brand); std::string data; device_1.SerializeToString(&data); LOGD("data %s\n",hexString(data).c_str()); //aes-cbc加密 OpenSSL_add_all_algorithms(); // 创建并初始化 EVP_CIPHER_CTX 结构体 EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new(); EVP_CIPHER_CTX_init(ctx); unsigned char key[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f}; unsigned char iv[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; assert(sizeof(key) == 32); // AES256 key size assert(sizeof(iv) == 16); // IV is always the AES block size std::string plain((data)); std::vector<unsigned char> encrypted; size_t max_output_len = plain.length() + 16 - (plain.length() % 16); encrypted.resize(max_output_len); EVP_CipherInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv, 1); int actual_size = 0; EVP_CipherUpdate(ctx, &encrypted[0], &actual_size, reinterpret_cast<unsigned char *>(&plain[0]), plain.size()); int final_size; EVP_CipherFinal_ex(ctx, &encrypted[actual_size], &final_size); actual_size += final_size; encrypted.resize(actual_size); std::string hexString = byteArrayToHexString(encrypted); EVP_CIPHER_CTX_cleanup(ctx); LOGD("cryptodata %s\n",hexString.c_str()); return env->NewStringUTF(hexString.c_str()); } ```  添加编译选项用于去除符号 ``` set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden") ``` © 版权声明：非标注『转载』情况下本文为原创文章，版权归 Depy's docs 所有，转载请联系博主获得授权。