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Date: Sun, 25 Mar 2012 11:59:11 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: [JtR patch] Fast cracker for Mozilla Firefox, Thunderbird
 and SeaMonkey master passwords.

On 03/25/2012 01:50 AM, Solar Designer wrote:
> On Sat, Mar 24, 2012 at 01:12:53PM +0100, magnum wrote:
>> On 03/24/2012 10:25 AM, Dhiru Kholia wrote:
>>> However, I am getting the following warnings during compilation from
>>> the DES code. Can someone take a look and fix them? Thanks!
>>>
>>> mozilla_des.c: In function ?DES_CBCEn?:
>>> mozilla_des.c:751:2: warning: dereferencing type-punned pointer will
>>> break strict-aliasing rules [-Wstrict-aliasing]
>>
>> This is more of a follow-up question than an answer :)
>>
>> The enclosed patch mutes the warnings. Why are the braces needed and
>> what are they "doing"? The format seem to work fine with this patch.
> 
> How did you arrive at the braces?  This is weird stuff.  I am not even
> sure how to parse it (would need to do actual testing to see how gcc
> treats it) - I think this may be either an array initializer or GCC's
> "Statement Exprs" extension (although then you'd probably be required to
> include a semicolon before the closing curly brace, so this is probably
> not it).

I saw braces used like that in an example somewhere. I have no idea what
they do, hence my question :)

Maybe it's better to live with the (harmless) warnings until we know for
sure.

magnum

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