编译和交叉编译openssl

向右看齐 2023-07-18 03:26 1阅读 0赞

一、在主机上进行openssl编译，并生成动态库:  
下载openssl安装包：

root@kwt-virtual-machine:/home/kwt# wget http://distfiles.macports.org/openssl/openssl-1.1.1e.tar.gz

并解压到当前文件夹:

root@kwt-virtual-machine:/home/kwt# tar vxf openssl-1.1.1e.tar.gz

进入openssl-1.1.1e目录：

root@kwt-virtual-machine:/home/kwt# cd openssl-1.1.1e

然后是经典三部曲( ./config make make install)  
首先使用指令./config（PS:prefix 是安装目录，openssldir 是配置文件目录，shared 作用是生成动态连接库）：

root@kwt-virtual-machine:/home/kwt/openssl-1.1.1e# ./config shared --prefix=/home/kwt/openssl --openssldir=/home/kwt/openssl/ssl

然后就是make和make install（PS: 若提示-m64错误，则在修改当前目录下的Makeifle，删除：-m64 编译选项）:

root@kwt-virtual-machine:/home/kwt/openssl-1.1.1e# make

root@kwt-virtual-machine:/home/kwt/openssl-1.1.1e# make install

全部完成之后在安装目录/home/kwt/openssl下会有lib文件夹，里面有我们需要的动态库和静态库文件。然后我们跳转到/home/kwt/openssl/lib目录下，将动态库拷贝到系统库目录中/lib中：

root@kwt-virtual-machine:/home/kwt/openssl/lib# sudo cp -a libcrypto.so* libssl.so* /lib

然后我们写一个使用rc4加解密的程序测试一下：  
cryptotest.h：

#ifndef _CRYPTOTEST_H_
    #define _CRYPTOTEST_H_
    
    typedef enum { 
    	GENERAL = 0,
    	ECB,
    	CBC,
    	CFB,
    	OFB,
    	TRIPLE_ECB,
    	TRIPLE_CBC
    }CRYPTO_MODE;
     
    //string DES_Encrypt(const string cleartext, const string key, CRYPTO_MODE mode);
    //string DES_Decrypt(const string ciphertext, const string key, CRYPTO_MODE mode);
     
    char * RC4_Encrypt(const char *cleartext, const char * key, int cleartextlen, int keylen);
    char * RC4_Decrypt(const char * ciphertext, const char * key, int cleartextlen, int keylen);
     
    #endif //_CRYPTOTEST_H_

openssltest.c：

#include "cryptotest.h"
    #include <string.h>
    #include <stdio.h>
     
    int main()
    { 
    	char cleartext[] = "中国北京12345$abcde%ABCDE@！！！";
    	char *ciphertext;
    	char key[] = "beijingchina1234567890ABCDEFGH!!!";
     
    	ciphertext = RC4_Encrypt(cleartext, key, strlen(cleartext), strlen(key));
    	char * decrypt = RC4_Decrypt(ciphertext, key, strlen(cleartext), strlen(key));
     
    	printf("cleartext:%s\n", cleartext);
    	printf("genarate ciphertext:%s\n", ciphertext);
    	printf("src ciphertext:%s\n", ciphertext);
    	printf("genarate ciphertext:%s\n", decrypt);
     
    	if (strcmp(cleartext, decrypt) == 0)
    		printf("RC4 crypto ok!!!\n");
    	else
    		printf("RC4 crypto error!!!\n");
    	return 0;
    }

rc4test.c：

#include <stdlib.h>
    #include <openssl/rc4.h>
    #include <string.h>
    #include "cryptotest.h"
     
    char * RC4_Encrypt(const char *cleartext, const char * key, int cleartextlen, int keylen)
    { 
    	RC4_KEY rc4key;
    	char* tmp = malloc(cleartextlen + 1);
    	memset(tmp, 0, cleartextlen + 1);
     
    	RC4_set_key(&rc4key, keylen, (const unsigned char*)key);
    	RC4(&rc4key, cleartextlen, (const unsigned char*)cleartext, tmp);
    	return tmp;
    }
     
    char * RC4_Decrypt(const char * ciphertext, const char * key, int cleartextlen, int keylen)
    { 
    	RC4_KEY rc4key;
    	unsigned char* tmp = malloc(cleartextlen + 1);
    	memset(tmp, 0, cleartextlen + 1);
     
    	RC4_set_key(&rc4key, keylen, (const unsigned char*)key);
    	RC4(&rc4key, cleartextlen, (const unsigned char*)ciphertext, tmp);
     
    	return tmp;
    }

makefile：

CC      = gcc
    CPP     = g++
    RM      = rm -rf
    
    ## debug flag
    DBG_ENABLE   = 0
    
    ## source file path
    SRC_PATH   := .
    
    ## target exec file name
    TARGET     := openssltest
    
    ## get all source files
    SRCS         += $(wildcard $(SRC_PATH)/*.c)
    ## all .o based on all .c
    OBJS        := $(SRCS:.c=.o)
    
    
    ## need libs, add at here
    LIBS := ssl crypto
    
    ## used headers  file path
    INCLUDE_PATH := /home/kwt/openssl/include/
    
    ## used include librarys file path
    LIBRARY_PATH := /home/kwt/openssl/lib/
    
    ## debug for debug info, when use gdb to debug
    ifeq (1, ${DBG_ENABLE}) 
    	CFLAGS += -D_DEBUG -O0 -g -DDEBUG=1
    endif
    
    ## get all include path
    CFLAGS  += $(foreach dir, $(INCLUDE_PATH), -I$(dir))
    
    ## get all library path
    LDFLAGS += $(foreach lib, $(LIBRARY_PATH), -L$(lib))
    
    ## get all librarys
    LDFLAGS += $(foreach lib, $(LIBS), -l$(lib))
    
    
    all: clean build
    
    build:
    	$(CC) -c $(CFLAGS) $(SRCS)
    	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LDFLAGS)
    	$(RM) $(OBJS)
    
    clean:
    	$(RM) $(OBJS) $(TARGET)

然后make，生成openssltest可执行文件，我们执行一下这个文件会有输出：

root@kwt-virtual-machine:/home/kwt/Test/2# make

root@kwt-virtual-machine:/home/kwt/Test/2# ./openssltest
    cleartext:中国北京12345$abcde%ABCDE@！！！
    genarate ciphertext:Zu▒)▒0Xv▒ݏ▒▒▒▒▒
    src ciphertext:Zu▒)▒0Xv▒ݏ▒▒▒▒▒
    genarate ciphertext:中国北京12345$abcde%ABCDE@！！！
    RC4 crypto ok!!!
    root@kwt-virtual-machine:/home/kwt/Test/2#

二、openssl的交叉编译：  
在openssl-1.1.1e解压目录下，使用config命令：

./config no-asm no-shared no-async --prefix=/home/kwt/openssl/aarch/openssl/ --cross-compile-prefix=aarch64-linux-gnu-

生成了Makefile  
然后make（PS: 若提示-m64错误，则在修改当前目录下的Makeifle，删除：-m64 编译选项）和make install：

root@kwt-virtual-machine:/home/kwt/openssl-1.1.1e# make

root@kwt-virtual-machine:/home/kwt/openssl-1.1.1e# make install

全部完成之后在安装目录/home/kwt/openssl/aarch/openssl下会有lib文件夹，里面有我们需要的动态库和静态库文件。  
修改我们测试用的makefile中的部分内容如下：

CC      = aarch64-linux-gnu-gcc
    CPP     = aarch64-linux-gnu-g++
    INCLUDE_PATH := /home/kwt/openssl/aarch/openssl/include/
    LIBRARY_PATH := /home/kwt/openssl/aarch/openssl/lib/

最后make生成可执行文件。