[13540] in cryptography@c2.net mail archive
Re: NIST selects the OMAC as new block cipher mode
daemon@ATHENA.MIT.EDU (tom st denis)
Mon Jun 9 17:44:48 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 9 Jun 2003 14:42:54 -0700 (PDT)
From: tom st denis <tomstdenis@yahoo.com>
To: cryptography@metzdowd.com
In-Reply-To: <602A9B00299C8B4E8B788FBC6A703CD4047896@pompeia.opencs.com.br>
I'm thinking of adding OMAC to LibTomCrypt however I have a question
not resolved in the paper [or at least I didn't see it]. What is the
standard for computing u^-1 [L * x^-1 specifically] for arbitrary block
sizes?
I would have simply used a shift code .e.g.
L2 = L1 xor (L1 << 1)
Or something like that since it can be computed for any size block
cipher relatively easily.
Tom
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