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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#include 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#include #include #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 = gccCPP = g++RM = rm -rf## debug flagDBG_ENABLE = 0## source file pathSRC_PATH := .## target exec file nameTARGET := openssltest## get all source filesSRCS += $(wildcard $(SRC_PATH)/*.c)## all .o based on all .cOBJS := $(SRCS:.c=.o)## need libs, add at hereLIBS := ssl crypto## used headers file pathINCLUDE_PATH := /home/kwt/openssl/include/## used include librarys file pathLIBRARY_PATH := /home/kwt/openssl/lib/## debug for debug info, when use gdb to debugifeq (1, ${DBG_ENABLE}) CFLAGS += -D_DEBUG -O0 -g -DDEBUG=1endif## get all include pathCFLAGS += $(foreach dir, $(INCLUDE_PATH), -I$(dir))## get all library pathLDFLAGS += $(foreach lib, $(LIBRARY_PATH), -L$(lib))## get all librarysLDFLAGS += $(foreach lib, $(LIBS), -l$(lib))all: clean buildbuild: $(CC) -c $(CFLAGS) $(SRCS) $(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LDFLAGS) $(RM) $(OBJS)clean: $(RM) $(OBJS) $(TARGET) 然后make，生成openssltest可执行文件，我们执行一下这个文件会有输出：
root@kwt-virtual-machine:/home/kwt/Test/2# make
root@kwt-virtual-machine:/home/kwt/Test/2# ./openssltestcleartext:中国北京12345$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-gccCPP = 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。
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