linux-kernel - Re: [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot

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Date:	Wed, 25 Sep 2013 17:25:38 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	David Howells <dhowells@...hat.com>
cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	<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>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	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.hengli.com.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>,
	"Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot

On Wed, 25 Sep 2013, David Howells wrote:

> I have pushed some keyrings patches that will likely affect this to:
> 
> 	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-devel
> 
> I intend to ask James to pull these into his next branch.  If he's happy to do
> so, I can look at pulling at least your asymmetric keys patch on top of them.

This suggests a point that I raised at the Linux Plumbers conference:

Why are asymmetric keys used for verifying the hibernation image?  It
seems that a symmetric key would work just as well.  And it would be a
lot quicker to generate, because it wouldn't need any high-precision
integer computations.

Alan Stern

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