linux-kernel - Re: [PATCH RFC v5 3/4] crypto: rsa: add a new rsa generic implementation

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Message-ID: <15593683.jmSB8WjLMD@tachyon.chronox.de>
Date:	Tue, 16 Jun 2015 04:19:52 +0200
From:	Stephan Mueller <smueller@...onox.de>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
	keescook@...omium.org, jwboyer@...hat.com, richard@....at,
	steved@...hat.com, qat-linux@...el.com, dhowells@...hat.com,
	linux-crypto@...r.kernel.org, james.l.morris@...cle.com,
	jkosina@...e.cz, zohar@...ux.vnet.ibm.com, davem@...emloft.net,
	vgoyal@...hat.com
Subject: Re: [PATCH RFC v5 3/4] crypto: rsa: add a new rsa generic implementation

Am Montag, 15. Juni 2015, 18:49:15 schrieb Tadeusz Struk:

Hi Tadeusz,

> On 06/15/2015 04:23 PM, Stephan Mueller wrote:
> >> +	/* In FIPS mode only allow key size minimum 2K */
> >> 
> >> > +	if (fips_enabled && (mpi_get_size(key->n) < 256)) {
> > 
> > Considering my previous email, shouldn't that check rather be
> > 
> > if (fips_enabled &&
> > 
> >     ((mpi_get_size(key->n) != 256) || (mpi_get_size(key->n) != 384))
> 
> I'm not familiar with the FIPS requirements. I checked the NIST
> recommendations witch states that RSA: |n| >= 2048 is acceptable. If FIPS
> allows 2K and 3K only then we need to change it.

The reason for exclusive 2k/3k is the CAVS testing: there is only the ability 
to test 2/3k. Longer key sizes are even not allowed as per SP800-131A in favor 
of EC.


-- 
Ciao
Stephan
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