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Re: memxor

From: Simon Josefsson
Subject: Re: memxor
Date: Tue, 12 Apr 2011 15:12:34 +0200
User-agent: Gnus/5.110016 (No Gnus v0.16) Emacs/23.2 (gnu/linux)

Bruno Haible <address@hidden> writes:

> Hello Nikos,
>> > Can you tell me
>> > one program which spends more than 20% of its runtime in memxor?
>> I had 10% speed-ups in a web server that used gnutls with the optimized
>> version of memxor. That is because CBC encryption mode uses XOR heavily.
>> 10% is enormous speed-up considering that this is a very small part of
>> the encryption process.
> OK, that is sufficient rationale for having this faster memxor function in
> gnutls.
> The next question, also to Simon, is whether you want to have the faster
> memxor only in gnutls and leave the slower but simpler one in gnulib
> (used by the modules crypto/*hmac-* only). Or whether you want to have the
> faster one in gnulib.

I'm surprised the gnulib memxor ends up being used by GnuTLS at all.
Nikos, shouldn't the Nettle implementation be used instead?  Is this a
question of the GnuTLS (gnulib) memxor symbol replacing the memxor that
is shipped with Nettle?  Maybe the solution is to fix the Nettle


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