基于Crypto++的aes 字符串加解密实现

esaes.h:

#ifndef ESAES_H
#define ESAES_H
#include <cryptopp/aes.h>
#include <iostream>
#include <string>
using namespace std;
using namespace CryptoPP;
class ESAes
{
public:
    ESAes();
    string encrypt();
    string decrypt();
    void test();
    void Setkey(string inkey);
    void Setcleartext(string incleartext);
    void Setciphertext(string inciphertext);
private:
    string cleartext;
    string ciphertext;
    string key;
    unsigned char inBlock[AES::BLOCKSIZE];
};

#endif // ESAES_H

esaes.cpp

string ESAes::encrypt()
{
    //加密
    AESEncryption aesEncryptor; //加密器

    unsigned char aesKey[AES::DEFAULT_KEYLENGTH]=""; //密钥
    strcpy((char*)aesKey, key.c_str());
    unsigned char inBlock[AES::BLOCKSIZE]="";// = cleartext; //要加密的数据块
    strcpy((char*)inBlock,cleartext.c_str());
    unsigned char outBlock[AES::BLOCKSIZE]; //加密后的密文块
    unsigned char xorBlock[AES::BLOCKSIZE]; //必须设定为全零

    memset( xorBlock, 0, AES::BLOCKSIZE ); //置零

    aesEncryptor.SetKey( aesKey, AES::DEFAULT_KEYLENGTH ); //设定加密密钥
    //aesEncryptor.SetKey();
    aesEncryptor.ProcessAndXorBlock( inBlock, xorBlock, outBlock ); //加密

    //以16进制显示加密后的数据
    //for( int i=0; i<16; i++ ) {
    //cout << hex << (int)outBlock[i] << " ";
    //}
    //这里将字符数组转换成string类型
    ciphertext=(char*)outBlock;
    return ciphertext;
}
string ESAes::decrypt()
{
    //解密
    AESDecryption aesDecryptor;
    unsigned char aesKey[AES::DEFAULT_KEYLENGTH]=""; //密钥
    strcpy((char*)aesKey, key.c_str());
    unsigned char plainText[AES::BLOCKSIZE];
    //unsigned char outBlock[AES::BLOCKSIZE]=ciphertext; //加密后的密文块
    unsigned char outBlock[AES::BLOCKSIZE]="";
    strcpy((char*)outBlock,ciphertext.c_str());
    unsigned char xorBlock[AES::BLOCKSIZE]; //必须设定为全零

    memset( xorBlock, 0, AES::BLOCKSIZE ); //置零

    aesDecryptor.SetKey( aesKey, AES::DEFAULT_KEYLENGTH );

    //细心的朋友注意到这里的函数不是之前在DES中出现过的：ProcessBlock，
    //而是多了一个Xor。其实，ProcessAndXorBlock也有DES版本。用法跟AES版本差不多。
    //笔者分别在两份代码中列出这两个函数，有兴趣的朋友可以自己研究一下有何差异。
    aesDecryptor.ProcessAndXorBlock( outBlock, xorBlock, plainText );


    //for( int i=0; i<16; i++ )
    //{
    //    cout << plainText[i];
    //}
    cleartext=(char*)plainText;
    //cout << endl;
    return cleartext;
}
void ESAes::Setkey(string inkey)
{
    //设置密钥
    this->key=inkey;
}

void ESAes::Setcleartext(string incleartext)
{
    this->cleartext=incleartext;
}
void ESAes::Setciphertext(string inciphertext)
{
    ciphertext=inciphertext;
}