Improved AES performance
simon at josefsson.org
Mon Mar 17 23:50:54 CET 2008
Werner Koch <wk at gnupg.org> writes:
> I hacked libgcrypt a bit to see how to increase the symmetrical cipher
> performance. This should benefit all architecture except for Padlock,
> which I have not yet changed.
> The current SVN has the changes for AES in CFB and CBC mode. On my box
> it gives about 25% speedup with the benchmark tool. That tool has two
> new options:
> passes larger blocks of data to the encryption function
> and reduces the loop count instead.
> --cipher-repetitions N
> may be used to increase the loop count by a factor N.
> This is gives more accurate timings on fas machines.
Does applications using libgcrypt (i.e., gnutls) need to do anything to
take advantage of this speedup?
I'll see if I can measure any difference in my gnutls benchmarks.
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