OPENSSL安装 以及使用openssl中的AES加密和解密

OPENSSL安装：（VS）

  1:第一步和所有的软件安装一样。

 2：将OPENSSL中INLUCDE 和 LIB 分别拷贝到VS中VC的INLUCDE 和LIB目录下（我的机器上的目录是：C:\Program Files\Microsoft Visual Studio 10.0\VC。

 3：在VS中项目的属性中，添加链接库，include链接库

如下图：

 

(1)添加链接库

加入下图红色的LIB

（2）添加INCLUDE文件，指向OPENSSL的INCLUDE文件夹

 

搞定！！

下面是源码！

#pragma once

//#include "targetver.h"

#include <stdio.h>
#include <tchar.h>
#include "openssl/evp.h"
#include "openssl/rsa.h"
#include "openssl/aes.h"
#include "openssl/rand.h"

#include<iostream>
using namespace std;

void main()
{
    bool do_encrypt(unsigned char *iv,unsigned char *key,unsigned char *inBuffer,int inLen,unsigned char *outBuffer,int * pOutLen);
    bool do_decrypt(unsigned char *iv,unsigned char *key,unsigned char *inBuffer,int inLen,unsigned char *outBuffer,int * pOutLen);
    void print_hex(unsigned char *buf,unsigned int len);
    void print_char(unsigned char *buf,unsigned int len);

char RIV[] = "helloUSTCThisCourseIsCalledInformationSecurtiy";
unsigned char iv[16];
unsigned char *inBuffer=new unsigned char[];
unsigned char *aseOutBuffer=new unsigned char[];

unsigned char key[16]="this'is'a'test!";
char c=' ';
int i=0,outLen,inLen;

for (int k=0;k<16;k++)
{
int x = rand()%sizeof(RIV);
iv[k] = RIV[x];
}
cout<<"请输入需要加密的明文，以*作为结束符：";
while(c!='*')
{
c=getchar();
inBuffer[i++]=c;
}
cout<<endl;
do_encrypt(iv,key,inBuffer,i-1,aseOutBuffer,&outLen);
cout<<"使用AES进行加密,生成的密文为:";
print_hex(aseOutBuffer,outLen);
cout<<endl<<endl;

do_decrypt(iv,key,aseOutBuffer,outLen,inBuffer,&inLen);
cout<<"使用AES进行解密,解密得到明文为:";
print_hex(inBuffer,inLen);
cout<<endl;
cout<<"即:";
print_char(inBuffer,inLen);
cout<<endl<<endl;
system("pause");
}

   bool do_encrypt(unsigned char *iv,unsigned char *key,unsigned char *inBuffer,int inLen,unsigned char *outBuffer,int * pOutLen)
{
    int tmplen;
    EVP_CIPHER_CTX ctx;
    EVP_CIPHER_CTX_init(&ctx);
    EVP_EncryptInit_ex(&ctx,EVP_aes_128_cbc(),NULL,key,iv);
    
    if(!EVP_EncryptUpdate(&ctx,outBuffer,pOutLen,inBuffer,inLen))
    {
        return false;
    }
    
    if(!EVP_EncryptFinal_ex(&ctx,outBuffer+*pOutLen,&tmplen))
    {
        return false;
    }
*pOutLen+=tmplen;
EVP_CIPHER_CTX_cleanup(&ctx);
    return true;
}

  bool do_decrypt(unsigned char *iv,unsigned char *key,unsigned char *inBuffer,int inLen,unsigned char *outBuffer,int * pOutLen)
{
        int tmplen;
        EVP_CIPHER_CTX ctx;
        EVP_CIPHER_CTX_init(&ctx);
        EVP_DecryptInit_ex(&ctx,EVP_aes_128_cbc(),NULL,key,iv);
        if(!EVP_DecryptUpdate(&ctx,outBuffer,pOutLen,inBuffer,inLen))
        {
        return false;
        }
        if(!EVP_DecryptFinal_ex(&ctx,outBuffer+*pOutLen,&tmplen))
        {
        return false;
        }
        *pOutLen+=tmplen;
        EVP_CIPHER_CTX_cleanup(&ctx);
        return true;
}

 void print_hex(unsigned char *buf,unsigned int len)
{
    for(int i=0;i<len;i++)
        printf("%0.2x",buf[i]);
}

 void print_char(unsigned char *buf,unsigned int len)//字符形式显示数组内容
{
    for(int i=0;i<len;i++)
        printf("%c",buf[i]);
    
}