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

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Date:	Fri, 31 Jul 2015 23:46:11 +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 Fri, Jul 31, 2015 at 02:49:36PM +0200, Pavel Machek wrote:
> On Fri 2015-07-31 18:08:12, joeyli wrote:
> > 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.
> 
> Yes, its shorter, but its old name we are trying to move away
> from. Please do the same.
> 									Pavel

OK~ I will rename.


Thanks
Joey Lee
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