[SOLVED] A function is trying to redeclare itself on top of itself

[jordanwb]

I'm trying to improve PHProxy that available here by using mcrypt. A few months ago I asked a question regarding encryption methods. I was pointed to this page, I'm trying to implement those two functions (made a modification to the params). Now I put those to functions plus a key generator into a separate file called encryption.php Now in PHProxy's index.php on the third line I put

 

include "encryption.php";

 

to include those three functions. But I get this error:

 

Fatal error: Cannot redeclare linencrypt() (previously declared in /var/www/localhost/htdocs/proxy/encryption.php:3) in /var/www/localhost/htdocs/proxy/encryption.php on line 9

 

I searched php.net and it doesn't have a record of linencrypt or lindecrypt. On line 9 in encryption.php is a closing curly bracket. Also if I go to the file directly I don't get the error.

 

encryption.php:

 

<?php

function linencrypt($pass, $key)
{
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); //get vector size on ECB mode
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); //Creating the vector
        $cryptedpass = mcrypt_encrypt (MCRYPT_RIJNDAEL_256, $key, $pass, MCRYPT_MODE_ECB, $iv); //Encrypting using MCRYPT_RIJNDAEL_256 algorithm
        return $cryptedpass;
} // <- This is line 9

function lindecrypt($pass, $key)
{
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $decryptedpass = mcrypt_decrypt (MCRYPT_RIJNDAEL_256, $key, $pass, MCRYPT_MODE_ECB, $iv); //Decrypting...
        return rtrim($decryptedpass);
}

function GenerateRandomKey ($length)
{
// start with a blank password
$password = "";

// define possible characters
$possible = "0123456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

// set up a counter
$i = 0; 

// add random characters to $password until $length is reached
while ($i < $length)
{ 

	// pick a random character from the possible ones
	$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);

	// we don't want this character if it's already in the password
	if (!strstr($password, $char))
	{ 
		$password .= $char;
		$i++;
	}
}
// done!
return $password;
}

?>

 

I want to implement this encryption so that for each session a different key is used so that the encrypted site url isn't retrieved. I'm running Gentoo Linux 2008.0 with PHP Version 5.2.26-r6

[akitchin]

could it be that you're including the file twice?

[jordanwb]

I did think of that but no I did not.

 

I searched Gentoo Portage for mcrypt: http://gentoo-portage.com/Search?search=mcrypt perhaps I need to install mcrypt or libmcrypt?

[PFMaBiSmAd]

You are either including the file twice or it is inside of a loop. Post your code.

[jordanwb]

The file that the maker of PHProxy wrote is 1100+ lines of code. Here's the first couple of dozen:

 

<?php

// I added from here
include "encryption.php";

session_start ();

if (empty ($_SESSION['mcrypt_key']))
{
$_SESSION['mcrypt_key'] = GenerateRandomKey (32);
}
// To here
/*
   +-----------------+------------------------------------------------------------+
   |  Script         | PHProxy                                                    |
   |  Author         | Abdullah Arif                                              |
   |  Last Modified  | 5:27 PM 1/20/2007                                          |
   +-----------------+------------------------------------------------------------+
   |  This program is free software; you can redistribute it and/or               |
   |  modify it under the terms of the GNU General Public License                 |
   |  as published by the Free Software Foundation; either version 2              |
   |  of the License, or (at your option) any later version.                      |
   |                                                                              |
   |  This program is distributed in the hope that it will be useful,             |
   |  but WITHOUT ANY WARRANTY; without even the implied warranty of              |
   |  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
   |  GNU General Public License for more details.                                |
   |                                                                              |
   |  You should have received a copy of the GNU General Public License           |
   |  along with this program; if not, write to the Free Software                 |
   |  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
   +------------------------------------------------------------------------------+
*/

error_reporting(E_ALL);

 

What about the mcrypt libraries for Gentoo: http://gentoo-portage.com/Search?search=mcrypt

[jordanwb]

Damn I'm an idiot. I was including the file twice but I didn't know it.

 

There are two PHProxy files: index.php and index.inc.php I put the include it both files. But what I didn't know is that index.php included index.inc.php

[Andy-H]

Use include_once

[jordanwb]

Yes well. I replaced base64encode and base64decode with linencode and lindecode (respectively) as well as added a key and it works. I think.