linux-kernel - Re: [PATCH] lib/sha1: use the git implementation of SHA-1

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Message-ID: <CA+55aFz9K1A=v6RsMMfjJdMURWPNGTi6J53iA5jqSwqP+x-gRQ@mail.gmail.com>
Date:	Sun, 7 Aug 2011 13:17:35 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andreas Schwab <schwab@...ux-m68k.org>,
	Nicolas Pitre <nico@...xnic.net>
Cc:	Joachim Eastwood <manabian@...il.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	linux-kernel@...r.kernel.org,
	Ramsay Jones <ramsay@...say1.demon.co.uk>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, linux@....linux.org.uk
Subject: Re: [PATCH] lib/sha1: use the git implementation of SHA-1

On Sun, Aug 7, 2011 at 12:47 PM, Andreas Schwab <schwab@...ux-m68k.org> wrote:
>
> ARM has its own implementation of sha_transform in arch/arm/lib/sha1.S,
> which assumes SHA_WORKSPACE_WORDS is 80.

Well, that certainly explains it.

I wonder if that thing is worth it. It seems to be based on the bad
slow version of sha1, so I suspect that the biggest advantage of it
may the byte-swapping being done more efficiently. The ARM version of
"get_unaligned_be32()" is potentially pretty bad.

Joachim, does it all work for you if you just remove 'sha1.o' from
lib-y in arch/arm/lib/Makefile?

Nico (now with corrected email address): is that ARM-optimized asm
really worth it? Compared to the git C implementation?

                        Linus
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