这篇是我之前做项目时用到的，写了个小demo，发在原来的一个博客里。因为博客空间在国外经常被墙，今天把之前写的一些东西搬到这里来。

迅雷，快车旋风链接编码解码C#源代码

在做一个项目时，有要求用到下载工具下载，于是上网找了找，找到了这些链接的加密规则，自己写了几个转换方法

写的有点急，可能不太完善，若您在使用中发现问题，烦请留言给我指出，谢谢！

using System;

using System.Text;

/*

* Author:大宝http://dabao.im,http://dabao2010.blog.51cto.com

* Desc:迅雷，快车，旋风链接编码解码

*/

namespace Base64Url

{

class Program

{

#region 静态常量

/// <summary>迅雷 thunder://</summary>

publicconststring _thunder = "Thunder://";

/// <summary>快车 flashget://</summary>

publicconststring _flashget = "Flashget://";

/// <summary>QQ旋风 qqdl://</summary>

publicconststring _qqdl = "Qqdl://";

#endregion

staticvoid Main(string[] args)

{

string url = "";

url = "thunder://QUFmdHA6Ly82OjZAZnRwLjY2eXMub3JnOjQ1MDgv44CQ6L+F6Zu35LiL6L29d3d3LmR5MTMxLmNvbeOAkVjmiJjorabliY3kvKDvvJrph6HliJrni7xCROS4reiLseWPjOWtlzEyODDpq5jmuIUucm12Ylpa";

//url = "Flashget://W0ZMQVNIR0VUXWh0dHA6Ly9ibG9nLnhpYW9odW9jaGFpLm5ldFtGTEFTSEdFVF0=&xiaohuochai";

//url="Qqdl://aHR0cDovL2Jsb2cueGlhb2h2b2NoYWkubmV0";

string url2 = "http://xiaohuochai.net";

string thunder = "";

string flashget = "";

string qqdl = "";

//编码

thunder = EncodeUrlToBase64(url2, LinkType.Thunder);

flashget = EncodeUrlToBase64(url2, LinkType.Flashget);

qqdl = EncodeUrlToBase64(url2, LinkType.Qqdl);

Console.Write(thunder + "\r\n" + flashget + "\r\n" + qqdl + "\r\n");

//解码

string result = "您输入的地址可能不是迅雷，快车，旋风中的任何一种！";

if (url.StartsWith(_thunder, true, null))//迅雷

result = DecodeUrlFromBase64(url.Remove(0, _thunder.Length), LinkType.Thunder);

if (url.StartsWith(_flashget, true, null))//快车

result = DecodeUrlFromBase64(url.Remove(0, _flashget.Length), LinkType.Flashget);

if (url.StartsWith(_qqdl, true, null))//QQ旋风

result = DecodeUrlFromBase64(url.Remove(0, _qqdl.Length), LinkType.Qqdl);

Console.Write(result);

Console.ReadLine();

}

#region 编码&解码

#region 编码

/// <summary>

/// 编码URL

/// </summary>

/// <param name="url">原生URL</param>

protectedstaticstring EncodeUrlToBase64(string url, LinkType linktype)

{

string enurl = "";

string tempUrl = "";

switch (linktype)

{

case LinkType.Thunder:

tempUrl = "AA" + url + "ZZ";

enurl = _thunder + EnCodeUrl(tempUrl);

break;

case LinkType.Flashget:

tempUrl = "[FLASHGET]" + url + "[FLASHGET]";

enurl = _flashget + EnCodeUrl(tempUrl) + "&xiaohuochai";//&后为用户自定义信息，具体什么用还不清楚

break;

case LinkType.Qqdl:

enurl = _qqdl + EnCodeUrl(url);

break;

default:

break;

}

return enurl;

}

privatestaticstring EnCodeUrl(string tempUrl)

{

byte[] bytes; string enurl;

bytes = Encoding.Default.GetBytes(tempUrl);

enurl = Convert.ToBase64String(bytes);

return enurl;

}

#endregion

#region 解码

/// <summary>

/// 链接解码

/// </summary>

/// <param name="baseurl">链接</param>

protectedstaticstring DecodeUrlFromBase64(string baseurl, LinkType linktype)

{

string deurl = "";

switch (linktype)

{

case LinkType.Thunder:

deurl = DecodeUrl(baseurl);

deurl = deurl.Remove(0, 2);

deurl = deurl.Remove(deurl.Length - 2);

break;

case LinkType.Flashget:

deurl = DecodeUrl(baseurl.Remove(baseurl.LastIndexOf('&')));

deurl = deurl.Remove(0, 10);

deurl = deurl.Remove(deurl.Length - 10);

break;

case LinkType.Qqdl:

deurl = DecodeUrl(baseurl);

break;

default:

break;

}

return deurl;

}

privatestaticstring DecodeUrl(string baseurl)

{

byte[] bytes;

string deurl;

bytes = Convert.FromBase64String(baseurl);

deurl = Encoding.UTF8.GetString(bytes);

return deurl;

}

#endregion

#endregion

}

/// <summary>

/// 链接类型

/// </summary>

enum LinkType

{

/// <summary>迅雷</summary>

Thunder,

/// <summary>快车</summary>

Flashget,

/// <summary>QQ旋风</summary>

Qqdl

}

}