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Message-ID: <20120627100521.GB16786@openwall.com>
Date: Wed, 27 Jun 2012 14:05:21 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: mschap-v2 conversion
On Wed, Jun 27, 2012 at 02:54:35AM -0700, deepika dutta wrote:
> But md4 calculation is being done in mschapv2_crypt_all() which happens in both single and many salts cases (i debugged and confirmed). So how is keys_prepared flag playing any role here in avoiding this computation?
In the many salts case, the set of set_key() calls is followed by
repeated set_salt() and crypt_all() calls. The first call to
crypt_all() will compute the MD4s and set keys_prepared to 1. Further
calls to crypt_all() will check that flag and skip computation of MD4s -
until set_key() is called again, which doesn't happen until all salts
have been tried.
Alexander
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