Date: Mon, 12 Jan 2015 09:24:43 +0000 From: Vsevolod Stakhov <vsevolod@highsecure.ru> To: John-Mark Gurney <jmg@funkthat.com>, rozhuk.im@gmail.com Cc: freebsd-hackers@freebsd.org, freebsd-geom@freebsd.org Subject: Re: ChaCha8/12/20 and GEOM ELI tests Message-ID: <54B392DB.4020304@highsecure.ru> In-Reply-To: <20150112072249.GM1949@funkthat.com> References: <54b33bfa.e31b980a.3e5d.ffffc823@mx.google.com> <20150112072249.GM1949@funkthat.com>
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On 12/01/15 07:22, John-Mark Gurney wrote: > rozhuk.im@gmail.com wrote this message on Mon, Jan 12, 2015 at 06:13 +0300: >> FreeBSD firewall 11.0-CURRENT FreeBSD 11.0-CURRENT #3 r276867M: Fri Jan 9 >> 09:34:39 MSK 2015 root@firewall:/usr/obj/usr/src/sys/RIMx64 amd64 >> >> Cha?ha patch: >> http://netlab.linkpc.net/download/software/FreeBSD/patches/chacha.patch > > What's the difference between CHACHA and XCHACHA? XChaha is the version of chacha that accepts longer nonce (namely 20 bytes instead of 8). This mode could be used in random nonces model, thought it is certainly slightly slower as it requires 1 more round per operation. But the difference is negligible on 4K blocks. -- Vsevolod Stakhov
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