android studio使用openssl _android

学向勤中得，萤窗万卷书。这篇文章主要讲述android studio使用openssl相关的知识，希望能为你提供帮助。
前言
逆向的基础是开发，逆向分析时很多时候会使用一些公开的加密函数来对数据进行加密，通过使用 openssl 熟悉下。
正文
首先得先编译出来 openssl，然后把它们复制到你的工程目录下。

文章图片

include 是 openssl 的头文件。lib 下的那些是编译出来的so。
然后修改 build.gradle 中的 cmake 项：

文章图片

cppFlags 是编译选项， abiFilters指定编译so的 abi，和刚才 lib 目录中的目录项对应。后面会用到。
增加

文章图片

jniLibs.srcDirs 的值为openssl so的目录。表示打包时直接复制这些就行了。
最终的 build.gradle

apply plugin: ‘com.android.application‘android { compileSdkVersion 26 defaultConfig { applicationId "com.example.administrator.oi" minSdkVersion 19 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" externalNativeBuild { cmake { cppFlags "-std=c++11 -frtti -fexceptions" abiFilters ‘armeabi‘, ‘armeabi-v7a‘ } } } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile(‘proguard-android.txt‘), ‘proguard-rules.pro‘ } }sourceSets { main { jniLibs.srcDirs = ["C:\Users\Administrator\AndroidStudioProjects\oi\app\openssl_resouce\lib"] } }externalNativeBuild { cmake { path "CMakeLists.txt" } } }dependencies { implementation fileTree(dir: ‘libs‘, include: [‘*.jar‘]) implementation ‘com.android.support:appcompat-v7:26.1.0‘ implementation ‘com.android.support.constraint:constraint-layout:1.0.2‘ testImplementation ‘junit:junit:4.12‘ androidTestImplementation ‘com.android.support.test:runner:1.0.1‘ androidTestImplementation ‘com.android.support.test.espresso:espresso-core:3.0.1‘ }

然后修改 CMakeLists.txt，中文注释的地方就是修改的地方。

# 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 3.4.1)# 设置头文件加载的目录 include_directories(C:/Users/Administrator/AndroidStudioProjects/oi/app/openssl_resouce/include)#动态方式加载 add_library(openssl SHARED IMPORTED ) add_library(ssl SHARED IMPORTED )#引入第三方.so库，根据${ANDROID_ABI} 引用不同的库 set_target_properties(openssl PROPERTIES IMPORTED_LOCATION C:/Users/Administrator/AndroidStudioProjects/oi/app/openssl_resouce/lib/${ANDROID_ABI}/libcrypto.so) set_target_properties(ssl PROPERTIES IMPORTED_LOCATION C:/Users/Administrator/AndroidStudioProjects/oi/app/openssl_resouce/lib/${ANDROID_ABI}/libssl.so)# 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.add_library( # Sets the name of the library. native-lib# Sets the library as a shared library. SHARED# Provides a relative path to your source file(s). src/main/cpp/native-lib.cpp )# Searches for a specified prebuilt library and stores the path as a # variable. Because CMake includes system libraries in the search path by # default, you only need to specify the name of the public NDK library # you want to add. CMake verifies that the library exists before # completing its build.find_library( # Sets the name of the path variable. log-lib# Specifies the name of the NDK library that # you want CMake to locate. log )# 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.# 设置链接选项 target_link_libraries( # Specifies the target library. native-lib openssl ssl# Links the target library to the log library # included in the NDK. ${log-lib} )

然后就可以使用了。
【android studio使用openssl】项目路径
https://gitee.com/hac425/android_openssl/