linux-kernel - RE: [PATCH v4 1/1] use crc32 instead of md5 for hibernation e820 integrity check

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Date:   Fri, 9 Apr 2021 16:56:05 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Chris von Recklinghausen' <crecklin@...hat.com>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "simo@...hat.com" <simo@...hat.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "decui@...rosoft.com" <decui@...rosoft.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 1/1] use crc32 instead of md5 for hibernation e820
 integrity check

From: Chris von Recklinghausen
> Sent: 08 April 2021 11:46
> 
> Suspend fails on a system in fips mode because md5 is used for the e820
> integrity check and is not available. Use crc32 instead.
> 
> Prior to this patch, MD5 is used only to create a digest to ensure integrity of
> the region, no actual encryption is done. This patch set changes the integrity
> check to use crc32 instead of md5 since crc32 is available in both FIPS and
> non-FIPS modes.
> 
> Note that the digest is only used as an integrity check. No actual encryption
> is done.

If crc32 is good enough, would a 1's compliment sum be good enough?
It is likely to be faster to calculate and not need special
functions be built into the kernel at all.

	David

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