using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using log4net;
using log4net.Config;
using System.Security.Cryptography;
using System.IO.Compression;

namespace Common
{
    /// <summary>
    /// DES加密解密
    /// </summary>
    public class DESHelper
    {

        #region des加密
        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="str">需要加密的</param>
        /// <param name="sKey">密匙</param>
        /// <returns></returns>
        public string DesEncrypt(string input)
        {
            AesCryptoServiceProvider des = new AesCryptoServiceProvider();
            byte[] inputByteArray = Encoding.UTF8.GetBytes(input);
            des.Key = ASCIIEncoding.ASCII.GetBytes("lizxlylwkdqzymyzsqblt666");
            des.IV = ASCIIEncoding.ASCII.GetBytes("txwl888txwl20201");
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            byte[] message = ms.ToArray();
            string returnStr = "";
            if (message != null)
            {
                for (int i = 0; i < message.Length; i++)
                {
                    returnStr += message[i].ToString("X2");
                }
            }
            return returnStr;
        }

        #endregion

        #region des解密 判断请求是否过期

        /// <summary>
        /// 解密 
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public string DesDecrypt(string input)
        {

            try
            {
                byte[] inputBytes = HexStringToByteArray(input);
                //byte[] inputBytes = Convert.FromBase64String(input);
                using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
                {
                    aesAlg.Key = ASCIIEncoding.ASCII.GetBytes("lizxlylwkdqzymyzsqblt666");
                    aesAlg.IV = ASCIIEncoding.ASCII.GetBytes("txwl888txwl20201");

                    ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
                    using (MemoryStream msEncrypt = new MemoryStream(inputBytes))
                    {
                        using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
                        {
                            using (StreamReader srEncrypt = new StreamReader(csEncrypt))
                            {
                                return srEncrypt.ReadToEnd();
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                return "";
            }

        }
        /// <summary>
        /// 将指定的16进制字符串转换为byte数组
        /// </summary>
        /// <param name="s">16进制字符串(如：“7F 2C 4A”或“7F2C4A”都可以)</param>
        /// <returns>16进制字符串对应的byte数组</returns>
        public static byte[] HexStringToByteArray(string s)
        {
            s = s.Replace(" ", "");
            byte[] buffer = new byte[s.Length / 2];
            for (int i = 0; i < s.Length; i += 2)
                buffer[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
            return buffer;
        }

        public bool IsMtoken(string timeStamp)
        {
            var time = ConvertStringToDateTime(timeStamp);
            if (DateTime.Now > time.AddMinutes(1))
                return false;
            else
                return true;
        }
        /// <summary>        
        /// 时间戳转为C#格式时间        
        /// </summary>        
        /// <param name=”timeStamp”></param>        
        /// <returns></returns>        
        private DateTime ConvertStringToDateTime(string timeStamp)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000");
            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);
        }
        #endregion
        #region GZip压缩
        /// <summary>
        /// GZip压缩
        /// </summary>
        /// <param name="rawData"></param>
        /// <returns></returns>
        public byte[] Compress(byte[] rawData)
        {
            MemoryStream ms = new MemoryStream();
            GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Compress, true);
            compressedzipStream.Write(rawData, 0, rawData.Length);
            compressedzipStream.Close();
            return ms.ToArray();
        }
        #endregion
    }
}