DES加密 DESEncrypt

/// <summary>
    /// DES加密/解密类。
    /// </summary>
    public class DESEncrypt
    {
        public DESEncrypt()
        {
        }

        #region ========加密======== 

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
        {
            return Encrypt(Text,"MATICSOFT");
        }
        /// <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)
        {
            return Decrypt(Text,"MATICSOFT");
        }
        /// <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 

    }