linux-kernel - Re: [PATCH] crypto: add optional continuous repetition test to entropy store based rngs

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Message-Id: <1244824271.4496.151.camel@calx>
Date:	Fri, 12 Jun 2009 11:31:11 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Neil Horman <nhorman@...driver.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] crypto: add optional continuous repetition test to
 entropy store based rngs

On Sat, 2009-06-13 at 00:26 +1000, Herbert Xu wrote:
> On Fri, Jun 12, 2009 at 10:23:08AM -0400, Neil Horman wrote:
> >
> > > Ok, that seems like a reasonable idea.  new patch below
> > > Change Notes:
> > > 
> > > 1) Moved fips_enabled flag into its own header, included in all the appropriate
> > > places
> > > 
> > > 2) removed flags field from entropy store, keying continuous test on the
> > > non-null status of the last_data pointer
> > > 
> > > 
> > > FIPS-140 requires that all random number generators implement continuous self
> > > tests in which each extracted block of data is compared against the last block
> > > for repetition.  The ansi_cprng implements such a test, but it would be nice if
> > > the hw rng's did the same thing.  Obviously its not something thats always
> > > needed, but it seems like it would be a nice feature to have on occasion. I've
> > > written the below patch which allows individual entropy stores to be flagged as
> > > desiring a continuous test to be run on them as is extracted.  By default this
> > > option is off, but is enabled in the event that fips mode is selected during
> > > bootup.
> > > 
> > > Neil
> > > 
> > > Signed-off-by: Neil Horman <nhorman@...driver.com>
> > > 
> > Ping, I don't see that this got picked up in the crypto tree.  Are there
> > subsequent objections?
> 
> Matt, are you OK with me picking this up or do you want to pick it
> up?

Acked-by: Matt Mackall <mpm@...enic.com>

You can pick it up. Speaking of, do you care if I route other RNG bits
through your crypto tree? I usually just bounce patches to Andrew.

-- 
http://selenic.com : development and support for Mercurial and Linux


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