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Phrozen - PHP real-time encoder/decoder, protect your code.

Phrozen, The idea, you want to encode your scripts, however you don't want to have to make the end user install something to "un-encode" your script. Well, here is a poor-mans solution to that. This does real-time encoding-decoding of the files and the file is only left on disk for exactly enough time for it to be read and parsed. This is one solution, feel free to email me if you use this in a project, I would like to see how others have used it.

Info

Source Code ( 110 lines )

<?
##################################################################################
### Phrozen - one simple way to protect your scripts in real time.
### Joel De Gan 2002.
### http://www.tenshimedia.com, http://www.joihost.com
### If you use this somewhere, give me credit for the idea..
### 
### The idea, you want to encode your scripts, however you don't want to make
### the end user have to install something to "un-encode" them.
###
### solution: "Phrozen"
###
### This is more of the skeleton of the program, however it is fully functional.
### To run this example you will need to create a directory under where this
### file is located called "pages" and chmod it so that it is writable.
### load up the page, drop in some php code in the textarea and click on
### "phreeze", it will create a file in the pages directory that is an md5 hash
### of the code. 
### copy the name of that file and paste it into the box for "unphreeze"
### the encoded code in the file will be uncoded on the fly, written to disk
### and then included into this page.
###
### I am working out an idea for doing remote licensing of products written in 
### PHP, passing keys back and forth (software license keys) and having all the
### pages encrypted. 
###
##################################################################################
$page_dir = getcwd() . "/pages/"; // where out 'phro' files are located.
$include_dir = "pages/"; // same dir for includes for this example
$temp = "temp.php"; // also can use  the following; md5(time()) . ".php";
$temp_file = $page_dir . $temp;
$include_this = $include_dir . $temp;

// this function just reads an entire file into a string
function file_get_contents($filename, $use_include_path = 0) {
	$fd = fopen ($filename, "rb", $use_include_path);
	$contents = fread($fd, filesize($filename));
	fclose($fd);
  return $contents;
}//end function

### 
### phreeze/unfreeze functions, you can obviously add to these
### add in gzcompressing, encryption etc.
###
function phreeze($z){
    $z = serialize($z);
    $z = base64_encode($z);
  return $z;
}//end function

function unphreeze($z){
    $z = base64_decode($z);
    $z = unserialize($z);
    $z = stripslashes($z); // this is necessary.. don't remove
  return $z;
}//end function


###
###  some logic for how to phreeze/unfreeze data.
###
if ($code){
	// we got some data we need to phreeze.
	$phcode = phreeze($code);
	$name = md5($phcode) . ".phro";
	if (file_exists($page_dir . $name)) {
		$fp = fopen ($page_dir.$name, "aw");
		fputs ($fp, $phcode);
		fclose($fp);
	}else{
		$fp = fopen ($page_dir .$name, "w");
		fputs ($fp, $phcode);
		fclose($fp);
	}//fi
}//fi

// if we pass in the name of the file ($pcode) lets unphreeze it and
// toss it in a temporary file and include it, then unlink it.
if ($pcode){
	if (file_exists($page_dir . $pcode)) {
		$thecode = file_get_contents($page_dir . $pcode);
		$out = unphreeze($thecode);
		$fp = fopen ($temp_file, "w");
		fputs ($fp, $out); // slap the data in the file
		fflush($fp); // flush contents to file
		fclose($fp); // close our handle
		require "$include_this"; // include it
		unlink($temp_file);// remove the temp file
	}else{
		exit; // file not there.. don't do anything.
	}//fi
}//fi


### rest is just the forms for playing around with it.
?>

<form method=post>
<textarea cols=60 rows=10 name=code></textarea>
<br>
<input type=submit value="    phreeze it   ">
</form>


<form method=post>
<input type=text name=pcode>
<br>
<input type=submit value="    unphreeze it   ">
</form>