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Bug #14606 mcrypt_ofb with tripledes : 2.2.7 and 2.4.18 different behavior
Submitted: 2001-12-19 12:33 UTC Modified: 2001-12-20 02:52 UTC
From: jeanfrancois dot lecam at altiplano dot fr Assigned:
Status: Closed Package: mcrypt related
PHP Version: 4.1.0 OS: redhat 7.2
Private report: No CVE-ID: None
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 [2001-12-19 12:33 UTC] jeanfrancois dot lecam at altiplano dot fr 
Using exactly the same input data, the following lines won't return the same decryption result :

php-4.0.6 / libmcrypt-2.2.7 :

mcrypt_ofb("MCRYPT_TripleDES",$realkey,$ct,MCRYPT_DECRYPT,$iv);

php-4.1.0 / libmcrypt-2.4.18 :

mcrypt_ofb(MCRYPT_TripleDES, $realkey, $ct, MCRYPT_DECRYPT, $iv);

I have data encrypted with libmcrypt-2.2.7 that I want to use with libmcrypt-2.4.18, but I can not !!!

Thanks in adance,

JF

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 [2001-12-19 14:26 UTC] derick@php.net 
It is possible a problem in libmcrypt itself . A lot has changed in there that my have broke backwrd compability. It's not a PHP bug, because nothing has changed regarding to this between php 4.0.6 and 4.1.0. I'm closing this one.

Derick
 [2001-12-20 02:52 UTC] jeanfrancois dot lecam at altiplano dot fr 
I first thought of a problem with libmcrypt itself...
According to its author, 3DES has not changed (see below).
I'll probably have to decrypt my data with php-4.0.6-libmcrypt-2.2.7 and re-encrypt it with php-4.0.6-libmcrypt-2.4.18... Grrreat  :-)

----- Original Message ----- 
From: "Nikos Mavroyanopoulos" <nmav@hellug.gr>
To: "Jean-Francois LE CAM" <JeanFrancois.LeCam@altiplano.fr>
Sent: Wednesday, December 19, 2001 6:16 PM
Subject: Re: libmcrypt question (help!)


> On Wed, 19 Dec 2001 18:19:51 +0100 "Jean-Francois LE CAM" <JeanFrancois.LeCam@altiplano.fr> wrote:
> 
> > Hi Nikos,
> > I have been using libmcrypt for quite a long time now together with php.
> > My running conf is php-4.0.6 / libmcrypt-2.2.7
> > Trying to install php-4.1.0, I was said to upgrade to libmcrypt-2.4 (because
> > of a bug that will be fixed in php-4.1.1).
> > Is it possible that the TripleDES decryption does not give the same result
> > under libmcrypt-2.2.7 and libmcrypt-2.4.18 ?
> > That is what I suspect, and it would be rather baaaad for me since I have a
> > database containing data encrypted with 2.2.7 that I now wish to use with
> > 2.4.18.
> 
> No 3DES has not changed at all. But you may want to play with the
> mcrypt functions in php (to get them used in a compatible way).
> I do not know more, you'd better ask in a php group or something.
 
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