using System; 
 using System.Collections.Generic; 
 using System.Security.Cryptography; 
 using System.IO; 
 using System.Text; 
 using System.ComponentModel; 
  
 namespace SMSTimer 
 { 
   ///  <summary> 
   /// 完成加密和解密的功能 
   ///  </summary> 
   public class DES 
   { 
     ///  <summary> 
     /// 构造器 
     ///  </summary> 
     public DES() 
     { 
       // 
       // TODO: 在此处添加构造函数逻辑 
       // 
     } 
  
     //默认密钥初始化向量 
     private static byte[] DESIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; 
  
     ///  <summary> 
     /// DES加密字符串 
     ///  </summary> 
     ///  <param name="encriptString">待加密的字符串 </param> 
     ///  <param name="encKey">加密密钥,要求为8字节 </param> 
     ///  <returns>加密成功返回加密后的字符串，失败返回源串 </returns> 
     public static string Encrypt(string encriptString, string encKey) 
     { 
       if (encKey.Trim().Length != 8) 
         encKey = "87654321"; 
  
       try 
       { 
         byte[] bKey = Encoding.GetEncoding("GB2312").GetBytes(encKey.Substring(0, 8)); 
         byte[] bIV = DESIV; 
         byte[] bEncContent = Encoding.GetEncoding("GB2312").GetBytes(encriptString); 
         DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider(); 
         MemoryStream mStream = new MemoryStream(); 
         //用指定的 Key 和初始化向量 (IV) 创建对称数据加密标准 (DES) 加密器对象 
         CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write); 
         cStream.Write(bEncContent, 0, bEncContent.Length); 
         cStream.FlushFinalBlock(); 
         return Convert.ToBase64String(mStream.ToArray()); 
         // return Encoding.GetEncoding("GB2312").GetString(mStream.ToArray()); 
       } 
       catch 
       { 
         return encriptString; 
       } 
     } 
  
     ///  <summary> 
     /// DES解密字符串 
     ///  </summary> 
     ///  <param name="decryptString">待解密的字符串 </param> 
     ///  <param name="decryptKey">解密密钥,要求为8字节,和加密密钥相同 </param> 
     ///  <returns>解密成功返回解密后的字符串，失败返源串 </returns> 
     public static string Decrypt(string decryptString, string decryptKey) 
     { 
       if (decryptKey.Trim().Length != 8) 
         decryptKey = "87654321"; 
       try 
       { 
         byte[] bKey = Encoding.GetEncoding("GB2312&quo