linux-kernel - Re: [PATCH V4 13/15] Hibernate: introduced SNAPSHOT_SIG

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Message-ID: <20130926082146.GA22286@amd.pavel.ucw.cz>
Date:	Thu, 26 Sep 2013 10:21:47 +0200
From:	Pavel Machek <pavel@....cz>
To:	joeyli <jlee@...e.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-crypto@...r.kernel.org,
	opensuse-kernel@...nsuse.org, David Howells <dhowells@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Greg KH <gregkh@...uxfoundation.org>, JKosina@...e.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Gary Lin <GLin@...e.com>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH V4 13/15] Hibernate: introduced SNAPSHOT_SIG_HASH
 config for select hash algorithm

Hi!

> > On Sun 2013-09-15 08:56:59, Lee, Chun-Yi wrote:
> > > This patch introduced SNAPSHOT_SIG_HASH config for user to select which
> > > hash algorithm will be used during signature generation of snapshot.
> > 
> > This series is big enough already... and who is going to test it?
> 
> The hash config not just for testing, it's relate to the performance and
> secure between different hash algorithms.

I'm not saying it is for testing. I'm saying that selection makes
testing harder.

> There have person raised in LPC say he don't like SHA algorithm.

Well, I don't like the config option.

> > There's no need to make hash configurable. Just select one that works.
> 
> SHA1 has good performance, and SHA512 has better security, which one you
> like it?

Use SHA1. It is completely adequate for what you are trying to do.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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