using System;
using System.Text;
using System.IO;
using System.Web.UI;
using System.Web.Security;
using System.Globalization;
using System.Security.Cryptography;

namespace Baolee.GeneralMethod
{
 /// <summary>
 /// Encrypt 的摘要說明。
 /// </summary>
 public class Encrypt
 {  
  /// <summary>
  /// 構(gòu)造函數(shù)
  /// </summary>
  public Encrypt(Page mPage)
  {
   //
   // TODO: 在此處添加構(gòu)造函數(shù)邏輯   
   //
  }
  private static string ByteToString(byte[] b)
  {
   StringBuilder builder = new StringBuilder();
   for (int i = 0; i < b.Length; i++)
   {
    builder.AppendFormat("{0:X2}", b[i]);
   }
   return builder.ToString();
  }
  /// <summary>
  /// if don't input key , Use default key
  /// </summary>
  /// <param name="str">Desc string </param>
  /// <returns></returns>
  public static string Decode(string str)
  {
   return Decode(str, "Rainight");
  }
  /// <summary>
  /// Des 解密 GB2312
  /// </summary>
  /// <param name="str">Desc string</param>
  /// <param name="key">Key ,必須為8位 </param>
  /// <returns></returns>
  public static string Decode(string str, string key)
  {
   DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
   provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
   provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
   byte[] buffer = new byte[str.Length / 2];
   for (int i = 0; i < (str.Length / 2); i++)
   {
    int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
    buffer[i] = (byte) num2;
   }
   MemoryStream stream = new MemoryStream();
   CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
   stream2.Write(buffer, 0, buffer.Length);
   stream2.FlushFinalBlock();
   stream.Close();
   return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());
  }
  /// <summary>
  /// Des 解密字符串 UTF8
  /// </summary>
  /// <param name="sInputString">sInputString</param>
  /// <param name="sKey">sKey</param>
  /// <returns></returns>
  public string DecryptString(string sInputString, string sKey)
  {
   string[] textArray = sInputString.Split("-".ToCharArray());
   byte[] inputBuffer = new byte[textArray.Length];
   for (int i = 0; i < textArray.Length; i++)
   {
    inputBuffer[i] = byte.Parse(textArray[i], NumberStyles.HexNumber);
   }
   DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
   provider.Key = Encoding.ASCII.GetBytes(sKey);
   provider.IV = Encoding.ASCII.GetBytes(sKey);
   byte[] bytes = provider.CreateDecryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
   return Encoding.UTF8.GetString(bytes);
  }
  /// <summary>
  /// If don't input key , Use default key
  /// </summary>
  /// <param name="str"></param>
  /// <returns></returns>
  public static string Encode(string str)
  {
   return Encode(str, "Rainight");
  }
  /// <summary>
  /// Des 加密 GB2312
  /// </summary>
  /// <param name="str"></param>
  /// <param name="key"></param>
  /// <returns></returns>
  public static string Encode(string str, string key)
  {
   DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
   provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
   provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
   byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);
   MemoryStream stream = new MemoryStream();
   CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
   stream2.Write(bytes, 0, bytes.Length);
   stream2.FlushFinalBlock();
   StringBuilder builder = new StringBuilder();
   foreach (byte num in stream.ToArray())
   {
    builder.AppendFormat("{0:X2}", num);
   }
   stream.Close();
   return builder.ToString();
  }
  /// <summary>
  /// Des 加密 ,可以處理漢字 UTF8
  /// </summary>
  /// <param name="sInputString"></param>
  /// <param name="sKey"></param>
  /// <returns></returns>
  public string EncryptString(string sInputString, string sKey)
  {
   byte[] inputBuffer = Encoding.UTF8.GetBytes(sInputString);
   DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
   provider.Key = Encoding.ASCII.GetBytes(sKey);
   provider.IV = Encoding.ASCII.GetBytes(sKey);
   return BitConverter.ToString(provider.CreateEncryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length));
  }
  /// <summary>
  /// Base64字符串解碼
  /// </summary>
  /// <param name="str">Base64編碼的字符串</param>
  /// <returns>字符串</returns>
  public static string FromBase64(string str)
  {
   try
   {
    byte[] bytes = Convert.FromBase64String(str);
    str = Encoding.Default.GetString(bytes);
   }
   catch (Exception)
   {
   }
   return str;
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="str">要加密的字串,default use MD5 encrypt </param>
  /// <returns></returns>
  public static string MD5Encrypt(string str)
  {
   return MD5Encrypt(str, "MD5");
  }

  /// <summary>
  ///
  /// </summary>
  /// <param name="str">要加密的字串  </param>
  /// <param name="StrFormate">type of MD5 or SHA1 </param>
  /// <returns></returns>
  public static string MD5Encrypt(string str, string StrFormate)
  {
   if (StrFormate.ToUpper() == "SHA1")
   {
    return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "SHA1");
   }
   if (StrFormate.ToUpper() == "MD5")
   {
    return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
   }
   return "";
  }
  /// <summary>
  /// PB 的解碼
  /// </summary>
  /// <param name="str"></param>
  /// <returns></returns>
  public static string PBDecode(string str)
  {
   return PBDecode(str, "boalee");
  }
  /// <summary>
  /// PB的解碼
  /// </summary>
  /// <param name="str"></param>
  /// <param name="key"></param>
  /// <returns></returns>
  public static string PBDecode(string str, string key)
  {
   string text = "";
   int length = key.Length;
   for (int i = 0; i < str.Length; i++)
   {
    int num3 = (i + 1) % length;
    if (num3 == 0)
    {
     num3 = length;
    }
    int num = str[i] - key[num3 - 1];
    if (num < 0)
    {
     num += 0xff;
    }
    text = text + num.ToString();
   }
   return text;
  }
  /// <summary>
  /// PB 的編碼
  /// </summary>
  /// <param name="str"></param>
  /// <returns></returns>
  public static string PBEncode(string str)
  {
   return PBEncode(str, "boalee");
  }
  /// <summary>
  /// PB 的編碼
  /// </summary>
  /// <param name="str"></param>
  /// <param name="key"></param>
  /// <returns></returns>
  public static string PBEncode(string str, string key)
  {
   string text = "";
   int length = key.Length;
   for (int i = 0; i < str.Length; i++)
   {
    int num3 = (i + 1) % length;
    if (num3 == 0)
    {
     num3 = length;
    }
    int num = str[i] + key[num3 - 1];
    if (num > 0xff)
    {
     num -= 0xff;
    }
    text = text + num.ToString();
   }
   return text;
  }
  /// <summary>
  /// 字符串編碼為Base64
  /// </summary>
  /// <param name="str"></param>
  /// <returns></returns>
  public static string ToBase64(string str)
  {
   try
   {
    str = Convert.ToBase64String(Encoding.Default.GetBytes(str.ToCharArray()));
   }
   catch (Exception)
   {
   }
   return str;
  }
 }
}