使用Crypto++库的CBC模式实现加密（二）

前面已经有一篇介绍使用Crypto++库实现的加密的文章了，但是代码中考虑的不完全，所以就重新发了个二

C++封装：

#include "zyaes.h"
#include <string.h>
#include <stdio.h>

using namespace CryptoPP;

CZYAes::CZYAes()
{
    byte byteKey[] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08, 0x01,0x02, 0x03,0x04,0x05,0x06,0x07,0x08, 
                0x01,0x02, 0x03,0x04,0x05,0x06,0x07,0x08, 0x01,0x02, 0x03,0x04,0x05,0x06,0x07,0x08};
    byte byteIv[] = {0x01,0x02,0x03,0x04,0x01,0x02,0x03,0x04, 0x01,0x02, 0x03,0x04,0x01,0x02,0x03,0x04};
    memcpy(m_arrByteKey, byteKey, sizeof(byte) * 32);
    memcpy(m_arrByteIv, byteIv, sizeof(byte) * 16);
    m_nKeyLen = 32;
}

CZYAes::~CZYAes()
{
}

// set key and iv
void CZYAes::SetKey(std::string strKey, std::string strIv)
{
    int nKeyLen = 0;
    int nIvLen = 0;
    memset(m_arrByteKey, 0, sizeof(byte) * 32);
    memset(m_arrByteIv, 0, sizeof(byte) * 16);
    
    if (strKey.length() >= 32)
    {
        nKeyLen = 32;
    }
    else
    {
        nKeyLen = strKey.length();
    }
    memcpy(m_arrByteKey, strKey.c_str(), sizeof(byte) * nKeyLen);
    
    if (!strIv.empty())
    {
        if (strIv.length() >= 16)
        {
            nIvLen = 16;
        }    
        else
        {
            nIvLen = strIv.length();
        }
        memcpy(m_arrByteIv, strIv.c_str(), sizeof(byte) * nIvLen);
    }
}

// encrypt
std::string CZYAes::Encrypt(const std::string &strText)
{
    std::string strCipher;
    CBC_Mode<AES>::Encryption aesEncryptor(m_arrByteKey, m_nKeyLen, m_arrByteIv);
    StringSource(strText, true, new StreamTransformationFilter(aesEncryptor, new StringSink(strCipher)));
    
    std::string strEncoded;
    StringSource s2(strCipher, true,
        new HexEncoder(
            new StringSink(strEncoded)
        ) // HexEncoder
    ); // StringSource
    return strEncoded;
}

// decrypt
std::string CZYAes::Decrypt(const std::string &strCipher)
{
    std::string strDecoded;
    StringSource s2(strCipher, true,
        new HexDecoder(
            new StringSink(strDecoded)
        ) // HexEncoder
    ); // StringSource

    std::string strText;
    CBC_Mode<AES>::Decryption aesEncryptor(m_arrByteKey, m_nKeyLen, m_arrByteIv);
    StringSource(strDecoded, true, new StreamTransformationFilter(aesEncryptor, new StringSink(strText)));
    
    return strText;
}

实现文件