How to encrypt and decrypt URL when using GET
This is one example on how to encrypt and decrypt the URL in your system. You can't use this if you are using Drupals menu system where a certain segment should be the encrypted part because this encrypted string can contain slashes and make the call and arguments distributed in an uncontrolled way.
Your planned URL:
mysite.se/mymodulepath/EnCrYptedParTOne/EnCrYptedParTTwo
...can end up like:
mysite.se/mymodulepath/EnCrYpt/dParTOne/EnC//YptedParTTwo
But if you send it like a GET value it works like a charm.
mysite.se/mymodulepath?x=EnCrYptedParTOne&y=EnCrYptedParTTwo
..and fetch it with $_GET['x'] and $_GET['y'].
<?php
function encrypt_url($string) {
$key = "MAL_979805"; //key to encrypt and decrypts.
$result = '';
$test = "";
for($i=0; $i<strlen($string); $i++) {
$char = substr($string, $i, 1);
$keychar = substr($key, ($i % strlen($key))-1, 1);
$char = chr(ord($char)+ord($keychar));
$test[$char]= ord($char)+ord($keychar);
$result.=$char;
}
return urlencode(base64_encode($result));
}
function decrypt_url($string) {
$key = "MAL_979805"; //key to encrypt and decrypts.
$result = '';
$string = base64_decode(urldecode($string));
for($i=0; $i<strlen($string); $i++) {
$char = substr($string, $i, 1);
$keychar = substr($key, ($i % strlen($key))-1, 1);
$char = chr(ord($char)-ord($keychar));
$result.=$char;
}
return $result;
}
?>EDIT:
In this case I was building a system that needed to receive some input from a unauthorized user in a already existing system that is configured to receive data from the URL with a pattern like : /aaa/bbb/ccc etc. Just a regular cusomized module with hook_menu and function receiving the path and doing some operation. Can't even remember what project this was from, but I guess the path contained a user reference, some user given value and some password hash. So my first thought was to encrypt the whole URL, but since it can get extra slashes "/" within the encrypted section of the path, it will get corrupted. So the solution here is to use GET insted and use different parameters insted of slashes.