如何在 ANDROID 应用程序中使用 openSSL 库
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How to use openSSL Library in the ANDROID application
提问by Pankaj D. Gaurshettiwar
i am trying to embed the openssl library in my Android application using Android NDK but i don't know how to use exactly that library and so please any one can tell me how to use that please send a source code for my reference.......
我正在尝试使用 Android NDK 在我的 Android 应用程序中嵌入 openssl 库，但我不知道如何使用该库，所以请任何人告诉我如何使用它，请发送源代码以供我参考... ....
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采纳答案by Hans-Christoph Steiner
Have you tried this, its a standalone build of the openssl that's included in Android: https://github.com/fries/android-external-openssl/blob/master/README.android
你试过这个吗，它是 Android 中包含的 openssl 的独立版本：https: //github.com/fries/android-external-openssl/blob/master/README.android
回答by bartolo-otrit
There are several tips about using OpenSSL with Android:
在 Android 上使用 OpenSSL 有几个技巧：
It is necessary to build OpenSSL libraries using NDK tools, otherwise they will be incompatible with the NDK. Compiling the latest OpenSSL for Android
CC=~/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc ./Configure android-armv7 export ANDROID_DEV=~/android-ndk-r9//platforms/android-8/arch-arm/usr make build_libsIt is supposed that these commands are executed in the source directory of OpenSSL.
In order to use these libraries (ssl and crypto) with your own library from the NDK, you need to create additional *.mk files in jni folder. For example:
include $(CLEAR_VARS) LOCAL_MODULE := ssl-crypto LOCAL_SRC_FILES := openssl-crypto/libcrypto.so include $(PREBUILT_SHARED_LIBRARY)and include them into the main Android.mk:
include $(LOCAL_PATH)/openssl-ssl/Android.mkand probably add
include $(CLEAR_VARS)after it to avoid errors. Libraries will be placed into
libs/armabiand.apk.If you will encounter with
could not load library ... needed by ...error then it probably means that your library has soname with a version number. AFAIK NDK is unable to work with such libraries at this moment. There is a workaround (Dalvik is looking for .so file with '.0' extension - why?):rpl -R -e library.so.1.1 "library.so\x00\x00\x00\x00" libs objwhere
rplis a linux string replacement tool. Run this script after building and before running your application and it will remove version number from the project files. Follow the link for more information.If you use a C++ compiler you may get "undefined references" error in your C functions. Use
extern "C" {}to avoid this (see "C++ name mangling" for more info).At last make sure that there is a network permission in the manifest.
有必要使用 NDK 工具构建 OpenSSL 库，否则它们将与 NDK 不兼容。为 Android 编译最新的 OpenSSL
CC=~/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc ./Configure android-armv7 export ANDROID_DEV=~/android-ndk-r9//platforms/android-8/arch-arm/usr make build_libs假设这些命令是在 OpenSSL 的源目录中执行的。
为了将这些库（ssl 和加密）与您自己的 NDK 库一起使用，您需要在 jni 文件夹中创建额外的 *.mk 文件。例如：
include $(CLEAR_VARS) LOCAL_MODULE := ssl-crypto LOCAL_SRC_FILES := openssl-crypto/libcrypto.so include $(PREBUILT_SHARED_LIBRARY)并将它们包含在主 Android.mk 中：
include $(LOCAL_PATH)/openssl-ssl/Android.mk并可能添加
include $(CLEAR_VARS)在它之后以避免错误。库将被放置到
libs/armabi和 中.apk。如果您遇到
could not load library ... needed by ...错误，则可能意味着您的库具有带有版本号的 soname。AFAIK NDK 目前无法使用此类库。有一个解决方法（Dalvik 正在寻找带有“.0”扩展名的 .so 文件 - 为什么？）：rpl -R -e library.so.1.1 "library.so\x00\x00\x00\x00" libs objrpllinux字符串替换工具在哪里。在构建之后和运行应用程序之前运行此脚本，它将从项目文件中删除版本号。点击链接了解更多信息。如果您使用 C++ 编译器，您的 C 函数可能会出现“未定义引用”错误。使用
extern "C" {}避免这种（参见“C ++名称重整”获取更多信息）。最后确保清单中有网络权限。
