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

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Message-ID: <20150728120156.GB9518@amd>
Date:	Tue, 28 Jul 2015 14:01:56 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:	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>, "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [RFC PATCH 01/16] PM / hibernate: define HMAC algorithm and
 digest size of swsusp

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.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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