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From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: Help-wanted tasks for musl
Date: Sun, 19 Aug 2012 13:49:14 +0200	[thread overview]
Message-ID: <20120819114914.GD16602@port70.net> (raw)
In-Reply-To: <20120819042611.GA8731@brightrain.aerifal.cx>

* Rich Felker <dalias@aerifal.cx> [2012-08-19 00:26:11 -0400]:
> Preparing MD5 and SHA crypt for integration
> 
> See the threads on the list. Basically we need source with appropriate
> license status (MIT/BSD/permissive or public domain) that's optimized
> for size.
> 

i'm looking into this

fun fact:
the sha based crypt (the modern one designed in 2007,
but it follows the old weird md5 crypt algo)
has limits on the rounds but no mention of limits on keys

http://www.akkadia.org/drepper/SHA-crypt.txt

eventhough

step 11. is O(keylen * log(keylen))
step 14. is O(keylen^2) (!)
step 16. the reference implementation uses alloca(keylen) (!!)
step 21. is O(keylen * rounds)

(md5 crypt is O(keylen) with fixed iteration count)

and there are alignment optimizations in the
reference implementation..
i guess that's some bad joke


  parent reply	other threads:[~2012-08-19 11:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-19  4:26 Rich Felker
2012-08-19  8:10 ` idunham
2012-08-19 16:18   ` William Haddon
2012-08-19  8:44 ` boris brezillon
2012-08-19 11:49 ` Szabolcs Nagy [this message]
2012-08-19 16:56   ` Szabolcs Nagy
2012-08-19 17:29     ` Szabolcs Nagy
2012-08-20  0:51       ` Rich Felker
2012-08-20  1:35         ` Szabolcs Nagy
2012-08-20  1:39           ` Rich Felker
2012-08-20  1:58             ` Szabolcs Nagy
2012-08-20  2:12               ` Rich Felker
2012-08-28 20:09                 ` Szabolcs Nagy
2012-08-28 23:35                   ` Szabolcs Nagy
2012-08-29  0:15                     ` Szabolcs Nagy
2012-08-29 14:30                     ` Rich Felker
2012-08-29 15:14                       ` Szabolcs Nagy
2012-08-29 17:01                         ` Rich Felker
2012-08-30  8:40                           ` Szabolcs Nagy
2012-08-19 21:46 idunham
2012-08-19 22:19 ` Gregor Richards

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