Subject: Re: rotate-byte
From: (Rob Warnock)
Date: 17 Dec 2001 13:40:26 GMT
Newsgroups: comp.lang.lisp
Message-ID: <9vkska$uu1p$>
Christophe Rhodes  <> wrote:
| ... however, I have a proof-of-concept implementation for
| cmucl/sbcl/x86 that can compile (rotate-byte x (byte 32 0) y) for
| positive y efficiently.
| I don't know whether this is useful to anyone (apart from
| md5-transform writers)...

Should also prove useful for AES (a.k.a Rijndael a.k.a. FIPS-197)
<URL:>, which has
several 32-bit rotates of different amounts per round.


p.s Anybody done AES in CL yet...?

Rob Warnock, 30-3-510		<>
SGI Network Engineering		<>
1600 Amphitheatre Pkwy.		Phone: 650-933-1673
Mountain View, CA  94043	PP-ASEL-IA

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