using System;

using System.Configuration;

using System.IO;

using System.Security.Cryptography;  

using System.Text;

using System.Web;



namespace NBCZ.DBUtility

{

	/// <summary>

	/// DES加密/解密类。

	/// </summary>

	public class DesEncrypt

	{

        public static string jmkeys = ConfigurationManager.AppSettings["jmkey"];

        public static string encryption = "NBCZ948";

        /// <summary>

        /// 加密

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string Encrypt(string text)

        {

            return DESEnCode(text, jmkeys);

        }

      



        /// <summary>

        /// 解密

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string Decrypt(string text)

        {

            return DESDeCode(text, jmkeys);

        }



        /// <summary>

        /// 加密

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string Ecode(string text)

        {

            return DESEnCode(text, encryption);

        }



        /// <summary>

        /// 解密

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string Dcode(string text)

        {

            return DESDeCode(text, encryption);

        }



        /// <summary>

        /// 加密字符串

        /// </summary>

        /// <param name="pToEncrypt">要加密的字符</param>

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

        /// <returns></returns>

        public static string DESEnCode(string pToEncrypt, string sKey)

        {

            try

            {

                pToEncrypt = System.Web.HttpUtility.UrlEncode(pToEncrypt);

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);

                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

                MemoryStream ms = new 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);

                }

                ret.ToString();

                return ret.ToString();

            }

            catch

            {

                return null;

            }

        }



        #region DESDeCode DES解密

        /// <summary>

        /// 解密字符串

        /// </summary>

        /// <param name="pToDecrypt">解密字符</param>

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

        /// <returns></returns>

        public static string DESDeCode(string pToDecrypt, string sKey)

        {

            try

            {

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

                for (int x = 0; x < pToDecrypt.Length / 2; x++)

                {

                    int i = (System.Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

                    inputByteArray[x] = (byte)i;

                }



                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

                MemoryStream ms = new MemoryStream();

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

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

                cs.FlushFinalBlock();

                StringBuilder ret = new StringBuilder();

                return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));

            }

            catch

            {

                return null;

            }

        }



        /// <summary>  

        /// 获取时间戳  

        /// </summary>  

        /// <returns></returns>  

        public static string GetTimeStamp()  

        {  

            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);

            return Convert.ToInt64(ts.TotalSeconds).ToString();  

        }

        #endregion

	}

}