linux下小试cmake

linux下小试cmake2

linux下使用cmake构建静态库和动态库

linux下,cmake如何使用外部共享库和头文件

linux下cmake练手小实例

linux下使用cmake交叉编译Android可以使用的动态库

一、使用NDK、Cmake交叉编译可以在android上使用的动态库

在NDK16版本以上,自带Cmake交叉编译工具链,建议使用ndk16版本及以上的。我这里使用的是当前最新的ndk20版本。

步骤:

  • 安装ndk。目前最新的ndk是ndk20版本,怎么安装请看:ubuntu下ndk安装教程

  • 搭建好工程目录,怎么搭建请看上一章。这里给大家看一下,我的一个小实例。
    image

    唯一和上一章不同的地方就confirgure.sh脚本的编写,其他的都可以按照上一章的步骤。后面我会把CMakeLists.txt、md5.h、md5.cpp(md5.h和md5.cpp直接在网上copy的,具体的连接后来没找到)内容贴出来。

这是confirgure.sh脚本的内容

rm -rf build
mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=/home/ubuntu/NDK/ndkr20/android-ndk-r20/build/cmake/android.toolchain.cmake \
        -DANDROID_NDK=/home/ubuntu/NDK/ndkr20/android-ndk-r20 \
        -DANDROID_ABI=armeabi-v7a \
        -DANDROID_TOOLCHAIN=clang++ \
        -DANDROID_PLATFORM=android-21 \
        -DCMAKE_BUILD_TYPE=debug \
        ..

make

和上一章的区别就是 cmake指令后面加参数了,下面是参数的解释

DCMAKE_TOOLCHAIN_FILE:指定ndk交叉编译链工具的路径,在ndk16版本以上,ndk自带cmake交叉编译工具链。

DANDROID_NDK:NDK的安装跟目录

DANDROID_ABI:各大平台:如armeabi-v7a、x86、mips等。android下基本编译一个armeabi-v7a就可以了,当然也可以加一个x86,方便在虚拟机上调试。

DANDROID_TOOLCHAIN:表示交叉编译链类型,取值gcc或者clang,clang++;gcc已经被废弃

DANDROID_PLATFORM:定义最低api版本

DCMAKE_BUILD_TYPE:定义构建类型,取值Debug或Release,Release

编译完成之后的目录是这样:libmd5.so是就是我们需要的动态库。

image

二、在androidstudio上使用刚才编译好的so库

新建一个androidstudio的c++工程,这个不解释了,不会的百度。

新建完成之后在main目录下创建jniLibs目录,把刚才生成的libmd5.so复制进去。
然后在main/cpp目录下创建include目录,吧刚才的md5.h头文件复制进去。
接下来就是编写AndroidStudio中的CMakeLists.txt,如下图
image

native-lib.cpp的内容如下:

#include <jni.h>
#include <string>
#include <android/log.h>
#include "include/md5.h"

#define LOGI(FORMAT, ...) __android_log_print(ANDROID_LOG_INFO,"cmake",FORMAT,##__VA_ARGS__);
#define LOGE(FORMAT, ...) __android_log_print(ANDROID_LOG_ERROR,"cmake",FORMAT,##__VA_ARGS__);

extern "C" JNIEXPORT jstring JNICALL
Java_com_magicpie_ndkdemo_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";

    MD5_CTX *ctx = new MD5_CTX();
    MD5Init(ctx);
    MD5Update(ctx, (unsigned char *) hello.c_str(), hello.length());
    unsigned char digest[16];
    MD5Final(ctx, digest);
    int i = 0;
    char szMd5[32] = {0};
    for (i = 0; i < 16; i++) {
        LOGI("EncryptUtils--> szMd5[%d]:%s", i, szMd5);
        //最终生成32位,不足前面补一位0
        //x 表示以十六进制形式输出 ,02 表示不足两位,前面补0输出;出过两位,不影响
        sprintf(szMd5, "%s%02x", szMd5, digest[i]);
    }
    return env->NewStringUTF(szMd5);
}

另外不要忘了配置gradle:
gradle.properties: 中添加

android.useDeprecatedNdk=true

appbuild.gradle 中添加

ndk{
    abiFilters "armeabi-v7a"
}

appbuild.gradle 全部内容如下:

android {
    defaultConfig {
        externalNativeBuild {
            cmake {
                cppFlags ""
                abiFilters "armeabi-v7a"
            }
        }
        ndk{
            abiFilters "armeabi-v7a"
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
            version "3.10.2"
        }
    }
}

下面分别是CMakeLists.txt、md5.h、md5.cpp的全部代码:

在ubuntu下编译时的CMakeLists.txt

cmake_minimum_required(VERSION 3.4.1)

PROJECT(MD5)

INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/include)

AUX_SOURCE_DIRECTORY(${PROJECT_SOURCE_DIR}/src SRC_LISTS)

SET(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)

ADD_LIBRARY(md5 SHARED ${SRC_LISTS})

md5.h

#ifndef MD5_H
#define MD5_H

typedef struct
{
    unsigned int count[2];
    unsigned int state[4];
    unsigned char buffer[64];
}MD5_CTX;


#define F(x,y,z) ((x & y) | (~x & z))
#define G(x,y,z) ((x & z) | (y & ~z))
#define H(x,y,z) (x^y^z)
#define I(x,y,z) (y ^ (x | ~z))
#define ROTATE_LEFT(x,n) ((x << n) | (x >> (32-n)))

#define FF(a,b,c,d,x,s,ac) {\
    a += F(b, c, d) + x + ac; \
    a = ROTATE_LEFT(a, s); \
    a += b; \
    }

#define GG(a,b,c,d,x,s,ac) { \
        a += G(b, c, d) + x + ac; \
        a = ROTATE_LEFT(a, s); \
        a += b; \
    }

#define HH(a,b,c,d,x,s,ac) { \
        a += H(b, c, d) + x + ac; \
        a = ROTATE_LEFT(a, s); \
        a += b; \
    }
#define II(a,b,c,d,x,s,ac) { \
        a += I(b, c, d) + x + ac; \
        a = ROTATE_LEFT(a, s); \
        a += b; \
    }


void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen);
void MD5Final(MD5_CTX *context, unsigned char digest[16]);
void MD5Transform(unsigned int state[4], unsigned char block[64]);
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len);
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len);

#endif

md5.cpp

#include <jni.h>
#include "md5.h"
#include <string>

unsigned char PADDING[] = {
        0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

//在逆向代码的时候,需要关注下面的特征值
void MD5Init(MD5_CTX *context)
{
    context->count[0] = 0;
    context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xEFCDAB89;
    context->state[2] = 0x98BADCFE;
    context->state[3] = 0x10325476;
}

void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen)
{
    unsigned int i = 0, index = 0, partlen = 0;
    index = (context->count[0] >> 3) & 0x3F;
    partlen = 64 - index;
    context->count[0] += inputlen << 3;
    if (context->count[0] < (inputlen << 3))
        context->count[1]++;
    context->count[1] += inputlen >> 29;

    if (inputlen >= partlen)
    {
        memcpy(&context->buffer[index], input, partlen);
        MD5Transform(context->state, context->buffer);
        for (i = partlen; i + 64 <= inputlen; i += 64)
            MD5Transform(context->state, &input[i]);
        index = 0;
    }
    else
    {
        i = 0;
    }
    memcpy(&context->buffer[index], &input[i], inputlen - i);
}

void MD5Final(MD5_CTX *context, unsigned char digest[16])
{
    unsigned int index = 0, padlen = 0;
    unsigned char bits[8];
    index = (context->count[0] >> 3) & 0x3F;
    padlen = (index < 56) ? (56 - index) : (120 - index);
    MD5Encode(bits, context->count, 8);
    MD5Update(context, PADDING, padlen);
    MD5Update(context, bits, 8);
    MD5Encode(digest, context->state, 16);
}

void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len)
{
    unsigned int i = 0, j = 0;
    while (j < len)
    {
        output[j] = input[i] & 0xFF;
        output[j + 1] = (input[i] >> 8) & 0xFF;
        output[j + 2] = (input[i] >> 16) & 0xFF;
        output[j + 3] = (input[i] >> 24) & 0xFF;
        i++;
        j += 4;
    }
}

void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len)
{
    unsigned int i = 0, j = 0;
    while (j < len)
    {
        output[i] = (input[j]) |
                    (input[j + 1] << 8) |
                    (input[j + 2] << 16) |
                    (input[j + 3] << 24);
        i++;
        j += 4;
    }
}

void MD5Transform(unsigned int state[4], unsigned char block[64])
{
    unsigned int a = state[0];
    unsigned int b = state[1];
    unsigned int c = state[2];
    unsigned int d = state[3];
    unsigned int x[64];

    MD5Decode(x, block, 64);
    FF(a, b, c, d, x[0], 7, 0xd76aa478);
    FF(d, a, b, c, x[1], 12, 0xe8c7b756);
    FF(c, d, a, b, x[2], 17, 0x242070db);
    FF(b, c, d, a, x[3], 22, 0xc1bdceee);
    FF(a, b, c, d, x[4], 7, 0xf57c0faf);
    FF(d, a, b, c, x[5], 12, 0x4787c62a);
    FF(c, d, a, b, x[6], 17, 0xa8304613);
    FF(b, c, d, a, x[7], 22, 0xfd469501);
    FF(a, b, c, d, x[8], 7, 0x698098d8);
    FF(d, a, b, c, x[9], 12, 0x8b44f7af);
    FF(c, d, a, b, x[10], 17, 0xffff5bb1);
    FF(b, c, d, a, x[11], 22, 0x895cd7be);
    FF(a, b, c, d, x[12], 7, 0x6b901122);
    FF(d, a, b, c, x[13], 12, 0xfd987193);
    FF(c, d, a, b, x[14], 17, 0xa679438e);
    FF(b, c, d, a, x[15], 22, 0x49b40821);


    GG(a, b, c, d, x[1], 5, 0xf61e2562);
    GG(d, a, b, c, x[6], 9, 0xc040b340);
    GG(c, d, a, b, x[11], 14, 0x265e5a51);
    GG(b, c, d, a, x[0], 20, 0xe9b6c7aa);
    GG(a, b, c, d, x[5], 5, 0xd62f105d);
    GG(d, a, b, c, x[10], 9, 0x2441453);
    GG(c, d, a, b, x[15], 14, 0xd8a1e681);
    GG(b, c, d, a, x[4], 20, 0xe7d3fbc8);
    GG(a, b, c, d, x[9], 5, 0x21e1cde6);
    GG(d, a, b, c, x[14], 9, 0xc33707d6);
    GG(c, d, a, b, x[3], 14, 0xf4d50d87);
    GG(b, c, d, a, x[8], 20, 0x455a14ed);
    GG(a, b, c, d, x[13], 5, 0xa9e3e905);
    GG(d, a, b, c, x[2], 9, 0xfcefa3f8);
    GG(c, d, a, b, x[7], 14, 0x676f02d9);
    GG(b, c, d, a, x[12], 20, 0x8d2a4c8a);


    HH(a, b, c, d, x[5], 4, 0xfffa3942);
    HH(d, a, b, c, x[8], 11, 0x8771f681);
    HH(c, d, a, b, x[11], 16, 0x6d9d6122);
    HH(b, c, d, a, x[14], 23, 0xfde5380c);
    HH(a, b, c, d, x[1], 4, 0xa4beea44);
    HH(d, a, b, c, x[4], 11, 0x4bdecfa9);
    HH(c, d, a, b, x[7], 16, 0xf6bb4b60);
    HH(b, c, d, a, x[10], 23, 0xbebfbc70);
    HH(a, b, c, d, x[13], 4, 0x289b7ec6);
    HH(d, a, b, c, x[0], 11, 0xeaa127fa);
    HH(c, d, a, b, x[3], 16, 0xd4ef3085);
    HH(b, c, d, a, x[6], 23, 0x4881d05);
    HH(a, b, c, d, x[9], 4, 0xd9d4d039);
    HH(d, a, b, c, x[12], 11, 0xe6db99e5);
    HH(c, d, a, b, x[15], 16, 0x1fa27cf8);
    HH(b, c, d, a, x[2], 23, 0xc4ac5665);


    II(a, b, c, d, x[0], 6, 0xf4292244);
    II(d, a, b, c, x[7], 10, 0x432aff97);
    II(c, d, a, b, x[14], 15, 0xab9423a7);
    II(b, c, d, a, x[5], 21, 0xfc93a039);
    II(a, b, c, d, x[12], 6, 0x655b59c3);
    II(d, a, b, c, x[3], 10, 0x8f0ccc92);
    II(c, d, a, b, x[10], 15, 0xffeff47d);
    II(b, c, d, a, x[1], 21, 0x85845dd1);
    II(a, b, c, d, x[8], 6, 0x6fa87e4f);
    II(d, a, b, c, x[15], 10, 0xfe2ce6e0);
    II(c, d, a, b, x[6], 15, 0xa3014314);
    II(b, c, d, a, x[13], 21, 0x4e0811a1);
    II(a, b, c, d, x[4], 6, 0xf7537e82);
    II(d, a, b, c, x[11], 10, 0xbd3af235);
    II(c, d, a, b, x[2], 15, 0x2ad7d2bb);
    II(b, c, d, a, x[9], 21, 0xeb86d391);
    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;
}

到这基本就结束了,这些只是基础的,如果是实战的话,配置会比这复杂很多。

在这里插入图片描述

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