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Bug #44714 Mcrypt decrypt output bug in Firefox
Submitted: 2008-04-14 07:12 UTC Modified: 2008-04-14 16:32 UTC
From: isedc at yahoo dot com Assigned:
Status: Not a bug Package: mcrypt related
PHP Version: 5.2.5 OS: Windows Vista
Private report: No CVE-ID: None
 [2008-04-14 07:12 UTC] isedc at yahoo dot com
Description:
------------
Following an MCRYPT example on php.net, when decrypting a string that is less than 8 characters, will output in firefox and appended with ? marks to fill the other characters.

Example: ecrypted string is 4 characters long (abcd), when decrypting the string and outputting to firefox displays: abcd????

This was tested with Firefox 2.0.13.  This does not appear to affect Internet Explorer 7.

Reproduce code:
---------------
$key = "d9Qg%R*";
$text = "abcd";
	
$iv_size = mcrypt_get_iv_size(MCRYPT_XTEA, MCRYPT_MODE_ECB);	
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);	
$enc = mcrypt_encrypt(MCRYPT_XTEA, $key, $text, MCRYPT_MODE_ECB, $iv);
	
$crypttext = mcrypt_decrypt(MCRYPT_XTEA, $key, $enc, MCRYPT_MODE_ECB, $iv);
echo $crypttext;

Expected result:
----------------
echo output should be: abcd

Actual result:
--------------
echo output is actually: abcd????

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 [2008-04-14 16:32 UTC] derick@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

XTEA is a block algorithm, so it only encrypts/decrypts in blocks. It will therefore pad the string with \\0 bytes up until the block size. Those you see as ? when outputting the decrypted result.
 
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