Bug #60705 [NEW]: rijndael iv problem

From: Date: Tue, 10 Jan 2012 23:08:05 +0000
Subject: Bug #60705 [NEW]: rijndael iv problem
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-166335@lists.php.net to get a copy of this message 
From:             
Operating system: linux/windows
PHP version:      5.3.8
Package:          mcrypt related
Bug Type:         Bug
Bug description:rijndael iv problem

Description:
------------
Cryptography basics: IV is always the same as the block size, which is 16
bytes (128 bits) in case of AES(Rijndael). However, when you use
RIJNDAEL_192 or RIJNDAEL_256 with an IV of 16 bytes in CBC mode, you got a
warning "mcrypt_generic_init() [function.mcrypt-generic-init]: Iv size
incorrect; supplied length: 16, needed: 32". This is bullshit.

This way if you try to decrypt data encrypted by a 32 byte (256 bit) key
with 16 byte (128 bit) IV with RIJNDAEL_256 in CBC mode, the decrypted data
is WRONG. Even worse, if you modify the constant to RIJNDAEL_128, it
decrypts the ciphertext correctly. This is a major failure.

Tested with PHP 5.3.4 Win32 and 5.3.8 Linux.


Test script:
---------------
http://pastebin.com/X1S7bUXV

Expected result:
----------------
decrypted : hello world

decrypted : *garbage*



Actual result:
--------------
Warning: mcrypt_generic_init() [function.mcrypt-generic-init]: Iv size
incorrect; supplied length: 16, needed: 32 in ...
decrypted : ц2‘в АЭ/(ѕвy7YЃƒ0z=/оч|µ8„0Г£

decrypted : hello world

-- 
Edit bug report at https://bugs.php.net/bug.php?id=60705&edit=1
-- 
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=60705&r=trysnapshot54
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=60705&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=60705&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=60705&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60705&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=60705&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=60705&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=60705&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=60705&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=60705&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=60705&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=60705&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=60705&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=60705&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=60705&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=60705&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=60705&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=60705&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=60705&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=60705&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=60705&r=mysqlcfg

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