using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace UAS_MES_NEW.PublicMethod
{
    class Encryption
    {

        private static string encryptKey = "DBDB";

        public static string EncryptStr(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  
        }

        public static string DecryptStr(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  
        }
    }
}