恩从C＃code URL，URL解密在PHP（添加额外的字符以某种方式） [英] Encode URL from C#, decrypt URL in PHP (extra characters being added somehow)

问题描述

我现在读这个主题如此多的话题，我能不明白的地方问题可能可能说谎。我从加密一个C＃WinForm应用程序的URL的一部分。然后我想用PHP中的URL来读取和解密的URL（全部采用基地-64）。我有一些code到shrae：

结果

code加密URL（C＃）：

 公共静态字符串Base64En code（字符串str）
{
    字节[] = encbuff Encoding.UTF8.GetBytes（STR）;
    返回System.Web.HttpServerUtility.UrlTokenEn code（encbuff）;
}
 

解密的URL的一部分：

  Base64En code（CND0311J4S68CCU版本F.0BHPQOEM  -  F。）;
 

返回：

  Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1
 

结果

code解密URL（PHP）：

 回声base64_de code（Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1）;
 

返回：

  CND0311J4S68CCU版本。 F.0BHPQOEM  -  F5
 

所以，哪里是额外的5的回报从哪里来的结束？我不知道这出我的生活，很令人沮丧，因为你可以想像的。

我AP preciate任何帮助！ - 以及任何建议

感谢您，

埃文

解决方案

 CND0311J4S68CCU版本F.0BHPQOEM  -  F
 

连接codeD为base64不是：

  Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1
 

也许别的东西添加 1 到了最后，因为

 回声base64_de code（Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY）;
 

给你你在找什么。这东西加入它实际上是 System.Web.HttpServerUtility.UrlTokenEn code 。问题是从MSDN <以下（ / A>）

  

这（ System.Web.HttpServerUtility.UrlTokenEn code ）不使用标准的编码。它连接codeS与 - 和_字符，这是标准的。它也消除了=迹象。但是，而不是简单地删除它们（他们并不需要取消code中的字符串），它会替换他们以数字（0，1，2），表明已删除的的=号数。

所以要为它（演示）：

 ＆LT; PHP$ URLTOKEN =Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1;
回声urltoken_de code（$ URLTOKEN）;功能urltoken_de code（$令牌）
{
    返回base64_de code（SUBSTR（$令牌，0，-1））;
}
 

功能是pretty粗糙，并且可以改进实际处理它更具体的（ DEMO2 ）

 功能urltoken_de code（$令牌）
{
    $ LEN = strlen的（$令牌）;
    如果（！$ LEN）
       返回$令牌;    $位数= $令牌[$ LEN-1];
    如果（！in_array（$位数，（0,2）））
    {
        扔InvalidArgumentException（sprintf的（无效的结束位（％S）。'，$位））;
    }
    返回base64_de code（SUBSTR（$令牌，0，-1））;
}
 

I have read so many topics on this very subject by now, I can't understand where the issue could possibly lie. I am encrypting part of a URL from a C# winform application. I then want to read in the URL using php and decrypt the url (all using base-64). I do have some code to shrae:

Code to encrypt URL (C#):

public static string Base64Encode(string str)
{
    byte[] encbuff = Encoding.UTF8.GetBytes(str);
    return System.Web.HttpServerUtility.UrlTokenEncode(encbuff);
}

Decrypt a section of the URL:

Base64Encode("CND0311J4S68CCU Ver. F.0BHPQOEM - f");

Returns:

Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1

Code to decrypt URL (PHP):

echo base64_decode("Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1");

Returns:

CND0311J4S68CCU Ver. F.0BHPQOEM - f5

So, where is the extra "5" at the end of the return coming from? I cannot figure this out for the life of me, quite frustrating as you could imagine.

I appreciate any help with this - as well as any suggestions!

Thank you,

Evan

解决方案

"CND0311J4S68CCU Ver. F.0BHPQOEM - f"

encoded as base64 is not:

Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1

Probably something else is adding the 1 at the end, because

echo base64_decode("Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY");

gives you what you're looking for. And that something adding it is in fact System.Web.HttpServerUtility.UrlTokenEncode. The issue is the following (from MSDN):

This (System.Web.HttpServerUtility.UrlTokenEncode) does not use a standard encoding. It encodes with - and _ characters which is standard. It also removes the = signs. But rather than simply removing them (they're not necessary to decode the string), it replaces them with a digit (0, 1, 2) indicating the number of = signs that were removed.

So go for it (Demo):

<?php

$urltoken = "Q05EMDMxMUo0UzY4Q0NVIFZlci4gRi4wQkhQUU9FTSAtIGY1";
echo urltoken_decode($urltoken);

function urltoken_decode($token)
{
    return base64_decode(substr($token, 0, -1));
}

The function is pretty rough and could be improved to actually deal with it more specifically (Demo2):

function urltoken_decode($token)
{
    $len = strlen($token);
    if (!$len)
       return $token;

    $digit = $token[$len-1];
    if (!in_array($digit, range(0,2)))
    {
        throw InvalidArgumentException(sprintf('Invalid end digit (%s).', $digit));
    }
    return base64_decode(substr($token, 0, -1));
}

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