On 04/07/10 06:52, Craig Ringer wrote:
> Bacula currently only uses the AES CBC cypher mode. This cypher can't be
> effectively parallelized because block n+1 depends on block n.
> 
> The AES ECB mode was developed to address that limitation. Support for
> it is built into OpenSSL 0.9.8 . This trivial patch adds appropriate
> entries in the public crypto.h enum for cyphers so that the AES ECB mode
> may be requested by the fd, and translates this into OpenSSL cypher
> settings in crypto.c .
> 
> OpenSSL doesn't automatically do ECB encryption in parallel. However,
> unlike the currently used CBC mode, it's possible to do.
> 
> Right now, this patch gains you little or nothing. It also costs little
> or nothing, and probably shouldn't actually be applied at present. I'm
> putting it up here to keep it and the notes about crypto in the archives
> in case I don't have any luck following it up with an actually parallel
> implementation and others are looking into it later.
> 
> The next step is to try to spawn worker threads to encrypt chunks in
> parallel. Hopefully this will be possible with OpenSSL...

Craig, you should really think about joining the -devel list.  :)


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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         Renaissance Man, Unix ronin, Perl hacker, Free Stater
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