> -----Original Message----- > From: linux-btrfs-owner@xxxxxxxxxxxxxxx <linux-btrfs- > owner@xxxxxxxxxxxxxxx> On Behalf Of David Sterba > Sent: Thursday, 16 May 2019 3:27 AM > To: Johannes Thumshirn <jthumshirn@xxxxxxx> > Cc: David Sterba <dsterba@xxxxxxxx>; Linux BTRFS Mailinglist <linux- > btrfs@xxxxxxxxxxxxxxx> > Subject: Re: [PATCH 00/17] Add support for SHA-256 checksums > > > Once the code is ready for more checksum algos, we'll pick candidates and > my idea is to select 1 fast (not necessarily strong, but better than crc32c) and > 1 strong (but slow, and sha256 is the candidate at the moment). > > The discussion from 2014 on that topic brought a lot of useful information, > though some algos have could have evolved since. > > https://lore.kernel.org/linux-btrfs/1416806586-18050-1-git-send-email- > bo.li.liu@xxxxxxxxxx/ > > In about 5 years timeframe we can revisit the algos and potentially add more, > so I hope we'll be able to agree to add just 2 in this round. > > The minimum selection criteria for a digest algorithm: > > - is provided by linux kernel crypto subsystem > - has a license that will allow to use it in bootloader code (grub at > lest) > - the implementation is available for btrfs-progs either as some small > library or can be used directly as a .c file Xxhash would be a good candidate. It's extremely fast and almost crypto secure. Has been in the kernel for ~2 yeas iirc. Paul.
