简述

Crypto++库是一个用c++ 编写的密码类库，是一个自由软件。有关它的信息可以访问以下两个网站：

下载

进入Crypto++主页，下载对应的版本（我下载的是最新的：Crypto++ 5.6.3）

解压缩之后，我们会看到里面包含大量的头文件、源文件、以及工程文件，用VS2013打开cryptest.sln，然后进行编译（清理->重新生成）即可。

编译完成，会生成cryptest.exe、cryptlib.lib（E:\Crypto++5.6.3\Win32\Output\Debug）。

使用

新建一个Win32控制台应用程序TestCrypto++。

  1. 右键“属性”，选择“配置属性”-> C/C++ ->常规，附加包含目录E:\Crypto++5.6.3
  2. 右键“属性”，选择“配置属性”-> 链接器 ->常规，附加库目录E:\Crypto++5.6.3\Win32\Output\Debug
  3. 右键“属性”，选择“配置属性”-> C/C++ -> 代码生成，运行库选择“多线程调试(/MTd)”（Release模式下对应“多线程(/MT)”）。

此时，使用Crypto++的开发环境就搭建好了，在Crypto++ User Guide中的例子。

AES加解密

Ok，编写测试程序。。。

效果

源码

// TestCrypto++.cpp : 定义控制台应用程序的入口点。

#include "stdafx.h"

#include <aes.h>

#include <Hex.h>      // StreamTransformationFilter

#include <modes.h>    // CFB_Mode

#include <iostream>   // std:cerr

#include <sstream>   // std::stringstream

#include <string>  

using namespace std;

using namespace CryptoPP;

#pragma comment(lib, "cryptlib.lib" )  

std::string ECB_AESEncryptStr(std::string sKey, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    ECB_Mode_ExternalCipher::Encryption ecbEncryption(aesEncryption);

    StreamTransformationFilter ecbEncryptor(ecbEncryption, new HexEncoder(new StringSink(outstr)));

    ecbEncryptor.Put((byte *)plainText, strlen(plainText));

    ecbEncryptor.MessageEnd();

    return outstr;

}

std::string ECB_AESDecryptStr(std::string sKey, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    ECB_Mode<AES >::Decryption ecbDecryption((byte *)key, AES::MAX_KEYLENGTH);

    HexDecoder decryptor(new StreamTransformationFilter(ecbDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

std::string CBC_AESEncryptStr(std::string sKey, std::string sIV, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);

    StreamTransformationFilter cbcEncryptor(cbcEncryption, new HexEncoder(new StringSink(outstr)));

    cbcEncryptor.Put((byte *)plainText, strlen(plainText));

    cbcEncryptor.MessageEnd();

    return outstr;

}

std::string CBC_AESDecryptStr(std::string sKey, std::string sIV, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    CBC_Mode<AES >::Decryption cbcDecryption((byte *)key, AES::MAX_KEYLENGTH, iv);

    HexDecoder decryptor(new StreamTransformationFilter(cbcDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

std::string CBC_CTS_AESEncryptStr(std::string sKey, std::string sIV, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    CBC_CTS_Mode_ExternalCipher::Encryption cbcctsEncryption(aesEncryption, iv);

    StreamTransformationFilter cbcctsEncryptor(cbcctsEncryption, new HexEncoder(new StringSink(outstr)));

    cbcctsEncryptor.Put((byte *)plainText, strlen(plainText));

    cbcctsEncryptor.MessageEnd();

    return outstr;

}

std::string CBC_CTS_AESDecryptStr(std::string sKey, std::string sIV, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    CBC_CTS_Mode<AES >::Decryption cbcctsDecryption((byte *)key, AES::MAX_KEYLENGTH, iv);

    HexDecoder decryptor(new StreamTransformationFilter(cbcctsDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

std::string CFB_AESEncryptStr(std::string sKey, std::string sIV, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    CFB_Mode_ExternalCipher::Encryption cfbEncryption(aesEncryption, iv);

    StreamTransformationFilter cfbEncryptor(cfbEncryption, new HexEncoder(new StringSink(outstr)));

    cfbEncryptor.Put((byte *)plainText, strlen(plainText));

    cfbEncryptor.MessageEnd();

    return outstr;

}

std::string CFB_AESDecryptStr(std::string sKey, std::string sIV, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    CFB_Mode<AES >::Decryption cfbDecryption((byte *)key, AES::MAX_KEYLENGTH, iv);

    HexDecoder decryptor(new StreamTransformationFilter(cfbDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

std::string OFB_AESEncryptStr(std::string sKey, std::string sIV, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    OFB_Mode_ExternalCipher::Encryption ofbEncryption(aesEncryption, iv);

    StreamTransformationFilter ofbEncryptor(ofbEncryption, new HexEncoder(new StringSink(outstr)));

    ofbEncryptor.Put((byte *)plainText, strlen(plainText));

    ofbEncryptor.MessageEnd();

    return outstr;

}

std::string OFB_AESDecryptStr(std::string sKey, std::string sIV, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    OFB_Mode<AES >::Decryption ofbDecryption((byte *)key, AES::MAX_KEYLENGTH, iv);

    HexDecoder decryptor(new StreamTransformationFilter(ofbDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

std::string CTR_AESEncryptStr(std::string sKey, std::string sIV, const char *plainText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    AES::Encryption aesEncryption((byte *)key, AES::MAX_KEYLENGTH);

    CTR_Mode_ExternalCipher::Encryption ctrEncryption(aesEncryption, iv);

    StreamTransformationFilter ctrEncryptor(ctrEncryption, new HexEncoder(new StringSink(outstr)));

    ctrEncryptor.Put((byte *)plainText, strlen(plainText));

    ctrEncryptor.MessageEnd();

    return outstr;

}

std::string CTR_AESDecryptStr(std::string sKey, std::string sIV, const char *cipherText)

{

    std::string outstr;

    //填key

    SecByteBlock key(AES::MAX_KEYLENGTH);

    memset(key, 0x30, key.size());

    sKey.size() <= AES::MAX_KEYLENGTH ? memcpy(key, sKey.c_str(), sKey.size()) : memcpy(key, sKey.c_str(), AES::MAX_KEYLENGTH);

    //填iv

    byte iv[AES::BLOCKSIZE];

    memset(iv, 0x30, AES::BLOCKSIZE);

    sIV.size() <= AES::BLOCKSIZE ? memcpy(iv, sIV.c_str(), sIV.size()) : memcpy(iv, sIV.c_str(), AES::BLOCKSIZE);

    CTR_Mode<AES >::Decryption ctrDecryption((byte *)key, AES::MAX_KEYLENGTH, iv);

    HexDecoder decryptor(new StreamTransformationFilter(ctrDecryption, new StringSink(outstr)));

    decryptor.Put((byte *)cipherText, strlen(cipherText));

    decryptor.MessageEnd();

    return outstr;

}

int _tmain(int argc, _TCHAR* argv[])

{

    string plainText = "This Program shows how to use ECB, CBC, CBC_CTS, CFB, OFB and CTR mode of AES in Crypto++.";

    string aesKey = "0123456789ABCDEF0123456789ABCDEF";//256bits, also can be 128 bits or 192bits

    string aesIV = "ABCDEF0123456789";//128 bits

    string ECB_EncryptedText, ECB_DecryptedText,

        CBC_EncryptedText, CBC_DecryptedText,

        CBC_CTS_EncryptedText, CBC_CTS_DecryptedText,

        CFB_EncryptedText, CFB_DecryptedText,

        OFB_EncryptedText, OFB_DecryptedText,

        CTR_EncryptedText, CTR_DecryptedText;

    //ECB

    ECB_EncryptedText = ECB_AESEncryptStr(aesKey, plainText.c_str());//ECB加密

    ECB_DecryptedText = ECB_AESDecryptStr(aesKey, ECB_EncryptedText.c_str());//ECB解密  

    //CBC

    CBC_EncryptedText = CBC_AESEncryptStr(aesKey, aesIV, plainText.c_str());//CBC加密

    CBC_DecryptedText = CBC_AESDecryptStr(aesKey, aesIV, CBC_EncryptedText.c_str());//CBC解密  

    //CBC_CTS

    CBC_CTS_EncryptedText = CBC_CTS_AESEncryptStr(aesKey, aesIV, plainText.c_str());//CBC_CTS加密

    CBC_CTS_DecryptedText = CBC_CTS_AESDecryptStr(aesKey, aesIV, CBC_CTS_EncryptedText.c_str());//CBC_CTS解密  

    //CFB

    CFB_EncryptedText = CFB_AESEncryptStr(aesKey, aesIV, plainText.c_str());//CFB加密

    CFB_DecryptedText = CFB_AESDecryptStr(aesKey, aesIV, CFB_EncryptedText.c_str());//CFB解密  

    //OFB

    OFB_EncryptedText = OFB_AESEncryptStr(aesKey, aesIV, plainText.c_str());//OFB加密

    OFB_DecryptedText = OFB_AESDecryptStr(aesKey, aesIV, OFB_EncryptedText.c_str());//OFB解密  

    //CTR

    CTR_EncryptedText = CTR_AESEncryptStr(aesKey, aesIV, plainText.c_str());//CTR加密

    CTR_DecryptedText = CTR_AESDecryptStr(aesKey, aesIV, CTR_EncryptedText.c_str());//CTR解密  

    cout << "Crypto++ AES-256 加密测试" << endl;

    cout << "分别使用ECB，CBC, CBC_CTR，CFB，OFB和CTR模式" << endl;

    cout << "加密用密钥:" << aesKey << endl;

    cout << "密钥长度:" << AES::MAX_KEYLENGTH * 8 << "bits" << endl;

    cout << "IV:" << aesIV << endl;

    cout << endl;

    cout << "ECB测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << ECB_EncryptedText << endl;

    cout << "恢复明文：" << ECB_DecryptedText << endl << endl;

    cout << "CBC测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << CBC_EncryptedText << endl;

    cout << "恢复明文：" << CBC_DecryptedText << endl << endl;

    cout << "CBC_CTS测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << CBC_CTS_EncryptedText << endl;

    cout << "恢复明文：" << CBC_CTS_DecryptedText << endl << endl;

    cout << "CFB测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << CFB_EncryptedText << endl;

    cout << "恢复明文：" << CFB_DecryptedText << endl << endl;

    cout << "OFB测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << OFB_EncryptedText << endl;

    cout << "恢复明文：" << OFB_DecryptedText << endl << endl;

    cout << "CTR测试" << endl;

    cout << "原文：" << plainText << endl;

    cout << "密文：" << CTR_EncryptedText << endl;

    cout << "恢复明文：" << CTR_DecryptedText << endl << endl;

    getchar();

    return 0;

}

更多参考

http://blog.csdn.net/u011012932/article/details/51659452

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