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

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Message-ID: <20090612142644.GA15644@gondor.apana.org.au>
Date:	Sat, 13 Jun 2009 00:26:45 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Matt Mackall <mpm@...enic.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 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?

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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