linux-kernel - Re: [RFC PATCH 01/16] PM / hibernate: define HMAC algorithm and digest size of swsusp

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Message-ID: <20150731100812.GD13113@linux-rxt1.site>
Date:	Fri, 31 Jul 2015 18:08:12 +0800
From:	joeyli <jlee@...e.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	Jiri Kosina <jkosina@...e.cz>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC PATCH 01/16] PM / hibernate: define HMAC algorithm and
 digest size of swsusp

On Tue, Jul 28, 2015 at 02:01:56PM +0200, Pavel Machek wrote:
> On Thu 2015-07-16 22:25:15, Lee, Chun-Yi wrote:
> > Using HMAC-SHA1 to be the HMAC algorithm of signing hibernate
> > snapshot image. The digest size of HMAC-SHA1 is 160 bits (20 bytes),
> > this size will be also applied to the length of HMAC key.
> > 
> > In addition, add HIBERNATE_VERIFICATION kernel config.
> > 
> > Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
> > ---
> >  include/linux/suspend.h |  5 +++++
> >  kernel/power/Kconfig    | 13 +++++++++++++
> >  kernel/power/power.h    |  1 +
> >  3 files changed, 19 insertions(+)
> > 
> > diff --git a/include/linux/suspend.h b/include/linux/suspend.h
> > index 5efe743..6cd2a48 100644
> > --- a/include/linux/suspend.h
> > +++ b/include/linux/suspend.h
> > @@ -327,6 +327,11 @@ struct platform_hibernation_ops {
> >  };
> >  
> >  #ifdef CONFIG_HIBERNATION
> > +
> > +/* HMAC Algorithm of Hibernate Signature */
> > +#define SWSUSP_HMAC		"hmac(sha1)"
> > +#define SWSUSP_DIGEST_SIZE	20
> 
> I'd replace SWSUSP with HIBERNATION here, and pretty much everywhere.
>

SWSUSP is shorter than HIBERNATION, and there have some codes in hibernate
are also using swsusp. I still want to use it.


Thanks a lot!
Joey Lee 
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