Windows10 VS2017 C++使用crypto++库加密解密（AES）

参考文章：

https://blog.****.net/tangcaijun/article/details/42110319

首先下载库：

https://www.cryptopp.com/#download

使用vs2017打开cryptest.sln文件，解决方案选择“重订解决方案目标”，升级sdk。

编译库和dll文件

将生成的cryptopp.lib和cryptopp.dll放到项目文件夹，如果单独运行需要将dll文件拷贝到debug文件夹和生成的exe文件放在一起使用。

新建win32 c++控制台程序，工程->配置属性->vc++目录->包含目录，填写cryptopp的目录，需要使用其中的头文件.

编码：

#include "pch.h"
#include <iostream>
#include <fstream>
#include <aes.h>
#include <filters.h>
#include <modes.h>
#include <Windows.h>

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

using namespace std;

byte key[CryptoPP::AES::DEFAULT_KEYLENGTH], iv[CryptoPP::AES::BLOCKSIZE];

void initKV()
{
	memset(key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH);
	memset(iv, 0x00, CryptoPP::AES::BLOCKSIZE);

	// 或者也可以
	/*
	char tmpK[] = "1234567890123456";
	char tmpIV[] = "1234567890123456";
	for (int j = 0; j < CryptoPP::AES::DEFAULT_KEYLENGTH; ++j)
	{
		key[j] = tmpK[j];
	}
	for (int i = 0; i < CryptoPP::AES::BLOCKSIZE; ++i)
	{
		iv[i] = tmpIV[i];
	}
	*/
}

string encrypt(string plainText)
{
	string cipherText;

	//
	CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
	CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);
	CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink(cipherText));
	stfEncryptor.Put(reinterpret_cast<const unsigned char*>(plainText.c_str()), plainText.length() + 1);
	stfEncryptor.MessageEnd();

	string cipherTextHex;
	for (int i = 0; i < cipherText.size(); i++)
	{
		char ch[3] = { 0 };
		sprintf_s(ch, "%02x", static_cast<byte>(cipherText[i]));
		cipherTextHex += ch;
	}

	return cipherTextHex;
}

void writeCipher(string output)
{
	ofstream out("cipher.data");
	out.write(output.c_str(), output.length());
	out.close();

	cout << "writeCipher finish " << endl << endl;
}

string decrypt(string cipherTextHex)
{
	string cipherText;
	string decryptedText;
	int i = 0;
	while (true)
	{
		char c;
		int x;
		stringstream ss;
		ss << hex << cipherTextHex.substr(i, 2).c_str();
		ss >> x;
		c = (char)x;
		cipherText += c;
		if (i >= cipherTextHex.length() - 2)break;
		i += 2;
	}

	//
	CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
	CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv);
	CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decryptedText));
	stfDecryptor.Put(reinterpret_cast<const unsigned char*>(cipherText.c_str()), cipherText.size());

	stfDecryptor.MessageEnd();

	return decryptedText;
}

string readCipher()
{
	ifstream in("cipher.data");

	string line;
	string decryptedText;
	while (getline(in, line))
	{
		if (line.length() > 1)
		{
			decryptedText += decrypt(line) + "\n";
		}
		line.clear();
	}

	cout << "readCipher finish " << endl;
	in.close();
	return decryptedText;
}

int main()
{
	string text = "What's up dude!";
	cout << "text : " << text << endl;

	initKV();
	string cipherHex = encrypt(text);
	cout << "cipher : " << cipherHex << endl;
	writeCipher(cipherHex);

	string decrpt_text = readCipher();
	cout << "text : " << decrpt_text << endl;

	return 0;
}

运行结果：