C# 加密、解密函数

  #region ========加密========

         /// <summary>
         /// 加密
         /// </summary>
         /// <param name="Text"></param>
         /// <returns></returns>
         public static string Encrypt(string Text)
         {
             if (Text == null)
                 return Text;
             return Encrypt(Text, "123456789abcd");
         }
         /// <summary>
         /// 加密数据
         /// </summary>
         /// <param name="Text"></param>
         /// <param name="sKey"></param>
         /// <returns></returns>
         public static string Encrypt(string Text, string sKey)
         {
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
             byte[] inputByteArray;
             inputByteArray = Encoding.Default.GetBytes(Text);
             des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(, ));
             des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(, ));
             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
             cs.Write(inputByteArray, , inputByteArray.Length);
             cs.FlushFinalBlock();
             StringBuilder ret = new StringBuilder();
             foreach (byte b in ms.ToArray())
             {
                 ret.AppendFormat("{0:X2}", b);
             }
             return ret.ToString();
         }

         #endregion

         #region ========解密========

         /// <summary>
         /// 解密
         /// </summary>
         /// <param name="Text"></param>
         /// <returns></returns>
         public static string Decrypt(string Text)
         {
             if (Text == null)
                 return Text;
             return Decrypt(Text, "123456789abcd");
         }
         /// <summary>
         /// 解密数据
         /// </summary>
         /// <param name="Text"></param>
         /// <param name="sKey"></param>
         /// <returns></returns>
         public static string Decrypt(string Text, string sKey)
         {
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
             int len;
             len = Text.Length / ;
             byte[] inputByteArray = new byte[len];
             int x, i;
             for (x = ; x < len; x++)
             {
                 i = Convert.ToInt32(Text.Substring(x * , ), );
                 inputByteArray[x] = (byte)i;
             }
             des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(, ));
             des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(, ));
             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
             cs.Write(inputByteArray, , inputByteArray.Length);
             cs.FlushFinalBlock();
             return Encoding.Default.GetString(ms.ToArray());
         }                    #endregion