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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Jun 04, 2009 at 09:48:16PM -0400, Neil Horman wrote:
> On Fri, Jun 05, 2009 at 10:30:06AM +1000, Herbert Xu wrote:
> > On Thu, Jun 04, 2009 at 08:04:56PM -0400, Neil Horman wrote:
> > >
> > > Not sure what to do about this.  The intent is to provide the external reference
> > > to the fips_enabled flag (which is either defined as an extern in or #defined to
> > > 0 dependent on CONFIG_CRYPTO_FIPS).  I can cut'n'paste the code block from the
> > > include file and put it in here, but that seems like a worse solution to me.
> > > Let me know your thoughts, and I can change this accordingly.
> > 
> > You can put the fips flag into its own header file, e.g., linux/fips.h.
> > 
> 
> 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@xxxxxxxxxxxxx>
> 
Ping, I don't see that this got picked up in the crypto tree.  Are there
subsequent objections?

Neil

--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Kernel]     [Gnu Classpath]     [Gnu Crypto]     [DM Crypt]     [Netfilter]     [Bugtraq]

  Powered by Linux