using System;

using System.Security.Cryptography;

using System.Text;

namespace AttendService

{

    public static class DESEncrypt

    {

        #region ========加密========

        private static string txtKey = "PatrickpanP=";

        private static string txtIV = "LiuJineagel=";

         /// <summary>

        /// 加密数据

        /// </summary>

        /// <param name="Text"></param>

        /// <param name="sKey"></param>

        /// <returns></returns>

        public static string Encrypt(string Text)

        {

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray;

            inputByteArray = Encoding.Default.GetBytes(Text);

            //des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));

            //des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));

            des.Key = Convert.FromBase64String(txtKey);

            des.IV = Convert.FromBase64String(txtIV);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();

            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, 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>

        /// 解密数据

        /// </summary>

        /// <param name="Text"></param>

        /// <param name="sKey"></param>

        /// <returns></returns>

        public static string Decrypt(string Text)

        {

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            int len;

            len = Text.Length / 2;

            byte[] inputByteArray = new byte[len];

            int x, i;

            for (x = 0; x < len; x++)

            {

                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);

                inputByteArray[x] = (byte)i;

            }

            //des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));

            //des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));

            des.Key = Convert.FromBase64String(txtKey);

            des.IV = Convert.FromBase64String(txtIV);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();

            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);

            cs.FlushFinalBlock();

            return Encoding.Default.GetString(ms.ToArray());

        }

        #endregion

    }

}