openssl AES-cbc 加密通过C++实现

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我不是萧海哇 2022-06-13 12:53:01 博主文章分类：Qt实战

文章标签 #include i++ 加密解密 文章分类 Java 后端开发

最近工作需要使用到加密，对于程序内的数据就采用了对称加密，于是就使用了AES加密。废话不多说了，直接上代码

bob_aes.h

#ifndef bob_aes_h
#define bob_aes_h

#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <cstdlib>
#include <openssl/aes.h>

class BobAES
{
public:
  BobAES();
  ~BobAES();
  std::string aes_encrypt(std::string msg);
  std::string aes_decrypt(std::string msg);
private:
  int MSG_LEN;
  char key[AES_BLOCK_SIZE];
};

#endif

bob_aes.cpp

#include "bob_aes.h"

BobAES::BobAES()
    : MSG_LEN(0)
{
    for(int i = 0; i < AES_BLOCK_SIZE; i++)
    {
        key[i] = 32 + i;
    }
}

BobAES::~BobAES()
{

}

std::string BobAES::aes_encrypt(std::string msg)
{
    int i = msg.size() / 1024;
    MSG_LEN = ( i + 1 ) * 1024;


    //MSG_LEN = msg.size() + 16;

    char in[MSG_LEN];
    char out[MSG_LEN+16];
    memset((char*)in,0,MSG_LEN);
    memset((char*)out,0,MSG_LEN+16);
    
    strncpy((char*)in,msg.c_str(),msg.size());

    unsigned char iv[AES_BLOCK_SIZE]; //加密的初始化向量
    for(int j = 0; j < AES_BLOCK_SIZE; ++j)
    {
        iv[j] = 0;
    }

    AES_KEY aes;
    if(AES_set_encrypt_key((unsigned char*)key, 128, &aes) < 0)
    {
        return NULL;
    }
    int len = msg.size();

    AES_cbc_encrypt((unsigned char*)in,(unsigned char*)out,len,&aes,iv,AES_ENCRYPT);
    
    std::string encrypt_msg(&out[0],&out[MSG_LEN+16]);
    for(int i= 0;out[i];i++){
        printf("%x",(unsigned char)out[i]);
        //std::cout << dstStringTemp[i];
    }
    std::cout << std::endl;
    return encrypt_msg;
}

std::string BobAES::aes_decrypt(std::string msg)
{
    MSG_LEN = msg.size();
    
    char in[MSG_LEN];
    char out[MSG_LEN+16];
    memset((char*)in,0,MSG_LEN);
    memset((char*)out,0,MSG_LEN+16);

    strncpy((char*)in,msg.c_str(),msg.size());

    for(int i= 0;in[i];i++){
        printf("%x",(unsigned char)in[i]);
        //std::cout << dstStringTemp[i];
    }
    std::cout << std::endl;

    unsigned char iv[AES_BLOCK_SIZE]; //加密的初始化向量
    for(int j = 0; j < AES_BLOCK_SIZE; ++j)
    {
        iv[j] = 0;
    }

    AES_KEY aes;
    if(AES_set_decrypt_key((unsigned char*)key, 128, &aes) < 0)
    {
        return NULL;
    }
    int len = msg.size();
    AES_cbc_encrypt((unsigned char*)in,(unsigned char*)out,len,&aes,iv,AES_DECRYPT);
    std::string decrypt_msg = out;
    return decrypt_msg;
}