编程与调试 C++ -- Botan for Android: Crypto and TLS for Modern C++

Posted on February 24, 2021 (珠海)
编程 C/C++ Android

Cryptography Toolkit botan.randombit.net Botan: Crypto and TLS for Modern C++ 这个库有点特（sāo）别（qì），需要针对每个平台运行 configure.py 生成对应平台的代码，Star 1.6k，非常流（niú）行（bī）。

有文档 Building Botan，用 botan-2.13.0 版本搞事情。

Windows

python configure.py --os=windows --cc=msvc --cpu=x86_32 \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib

顺利生成三个文件：botan_all_internal.h，botan_all.h，botan_all.cpp。

–amalgamation

Use amalgamation to build

–disable-shared-library

Disable building a shared library

–enable-modules=MODS

Enable some specific modules

–minimized-build

Start with the bare minimum. This is mostly useful in conjuction with –enable-modules to get a build that has just the features a particular application requires.

Android

Android 难搞哦。

–cc-bin=BINARY

Set path to compiler binary If not provided, the value of the CXX environment variable is used if set.

Modern versions of Android NDK use Clang and support C++11. Simply configure using the appropriate NDK compiler:

$ export CXX=/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++
$ ./configure.py --os=android --cc=clang --cpu=arm64

set path=D:\Android\Sdk\ndk\22.0.7026061\toolchains\llvm\prebuilt\windows-x86_64\bin;%path% # 直接找到 clang++
python configure.py --os=android --cc=clang --cpu=x86_64 \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib --without-os-feature=getauxval

set CXX=D:\Android\Sdk\ndk\22.0.7026061\toolchains\llvm\prebuilt\windows-x86_64\bin\aarch64-linux-android28-clang++.cmd
python configure.py --os=android --cc=clang --cpu=arm64 \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib --without-os-feature=getauxval

set CXX=D:\Android\Sdk\ndk\22.0.7026061\toolchains\llvm\prebuilt\windows-x86_64\bin\armv7a-linux-androideabi28-clang++.cmd
python configure.py --os=android --cc=clang --cpu=arm \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib --without-os-feature=getauxval

set CXX=D:\Android\Sdk\ndk\22.0.7026061\toolchains\llvm\prebuilt\windows-x86_64\bin\i686-linux-android28-clang++.cmd
python configure.py --os=android --cc=clang --cpu=x86 \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib --without-os-feature=getauxval

set CXX=D:\Android\Sdk\ndk\22.0.7026061\toolchains\llvm\prebuilt\windows-x86_64\bin\x86_64-linux-android28-clang++.cmd
python configure.py --os=android --cc=clang --cpu=x86_64 \
    --minimized-build --amalgamation --disable-shared-library \
    --enable-modules=aes,sha2_32,md5,cbc,filters,zlib --without-os-feature=getauxval

整合

五份代码只有 botan_all.h 的部分头文件定义不一样， 拣出来 整合。

#ifdef _MSC_VER
    #include "botan_all_windows_msvc_x86_32.h"
#endif

// https://developer.android.com/ndk/guides/cpu-features
#ifdef __ANDROID__
    #ifdef __arm__
        #include "botan_all_android_clang_arm32.h"
    #endif
    #ifdef __aarch64__
        #include "botan_all_android_clang_arm64.h"
    #endif
    #ifdef __i386__
        #include "botan_all_android_clang_x86_32.h"
    #endif
    #ifdef __x86_64__
        #include "botan_all_android_clang_x86_64.h"
    #endif
#endif

botan_all_android_clang_arm32 vs botan_all_android_clang_x86_64 主要差异；

最终代码

Download

还需要从 https://www.zlib.net/ 下载：zlib-1.2.11.tar.gz 配合食用。^_^

参考资料快照

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