using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static string encryptKey = "Oyea"; //定义密钥
#region 加密字符串
/// <summary> /// 加密字符串
/// </summary> www.jb200.com
/// <param name="str">要加密的字符串</param>
/// <returns>加密后的字符串</returns>
static string Encrypt(string str)
{
DESCryptoServiceProvider descsp = new DESCryptoServiceProvider(); //实例化加/解密类对象
byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥
byte[] data = Encoding.Unicode.GetBytes(str);//定义字节数组，用来存储要加密的字符串
MemoryStream MStream = new MemoryStream(); //实例化内存流对象
//使用内存流实例化加密流对象
CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);
CStream.Write(data, 0, data.Length); //向加密流中写入数据
CStream.FlushFinalBlock(); //释放加密流
return Convert.ToBase64String(MStream.ToArray());//返回加密后的字符串
}
#endregion
#region 解密字符串
/// <summary>
/// 解密字符串
/// </summary>
/// <param name="str">要解密的字符串</param>
/// <returns>解密后的字符串</returns>
static string Decrypt(string str)
{
DESCryptoServiceProvider descsp = new DESCryptoServiceProvider(); //实例化加/解密类对象
byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥
byte[] data = Convert.FromBase64String(str);//定义字节数组，用来存储要解密的字符串
MemoryStream MStream = new MemoryStream(); //实例化内存流对象
//使用内存流实例化解密流对象
CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);
CStream.Write(data, 0, data.Length); //向解密流中写入数据
CStream.FlushFinalBlock(); //释放解密流
return Encoding.Unicode.GetString(MStream.ToArray()); //返回解密后的字符串
}
#endregion
static void Main(string[] args)
{
Console.Write("请输入要加密的字符串："); //提示输入字符串
Console.WriteLine(); //换行输入
string str = Console.ReadLine(); //记录输入的字符串
string strNew = Encrypt(str); //加密字符串
Console.WriteLine("加密后的字符串：" + strNew); //输出加密后的字符串
Console.WriteLine("解密后的字符串：" + Decrypt(strNew)); //解密字符串并输出
Console.ReadLine();
}
}
}
