Bug #52989 [Opn->Bgs]: the mcrypt_encrypt and mcrypt_decrypt functions are not accurate working.

From: Date: Wed, 13 Oct 2010 10:44:55 +0000
Subject: Bug #52989 [Opn->Bgs]: the mcrypt_encrypt and mcrypt_decrypt functions are not accurate working.
References: 1  Groups: php.bugs 
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Edit report at http://bugs.php.net/bug.php?id=52989&edit=1

 ID:                 52989
 Updated by:         derick@php.net
 Reported by:        info at wtovn dot com
 Summary:            the mcrypt_encrypt and mcrypt_decrypt functions are
                     not accurate working.
-Status:             Open
+Status:             Bogus
 Type:               Bug
 Package:            *Encryption and hash functions
 Operating System:   WIN32
 PHP Version:        5.3SVN-2010-10-05 (snap)
 Block user comment: N

 New Comment:

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

Thanks for the explanation uramihsayibok; I did not know this.


Previous Comments:
------------------------------------------------------------------------
[2010-10-13 04:01:36] uramihsayibok at gmail dot com

Not a bug. It's due to the nature of DES.

The least significant bit of each byte in the key is NOT USED, and the
only difference between the characters '0' and '1' is that least
significant bit. You can see the same behavior swapping 'B' and 'C',
'P'
and 'Q', and 'x' and 'y' (to give some examples). Generically, any
even-numbered ASCII character can be swapped with its n+1 neighbor, and
vice versa.

Separately: ECB mode does not use IVs so $iv is pointless.

------------------------------------------------------------------------
[2010-10-05 06:24:39] info at wtovn dot com

Description:
------------
the mcrypt_encrypt and mcrypt_decrypt functions are not accurate
working. 
please see script below.

Test script:
---------------
    $data = "Cộng hòa xã hội chủ nghĩa việt nam, độc
lập
tự do hạnh phúc";   
    $iv_size = mcrypt_get_iv_size(MCRYPT_3DES, MCRYPT_MODE_ECB);   
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);   
    $key = "01";
    $crypttext = mcrypt_encrypt(MCRYPT_3DES, $key, $data,
MCRYPT_MODE_ECB, $iv);   
    $key = "10";   
    $decrypt = mcrypt_decrypt (MCRYPT_3DES, $key , $crypttext ,
MCRYPT_MODE_ECB, $iv) ;  


then result are :

    $data = $decrypt ????



------------------------------------------------------------------------



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