linux-kernel - Re: [PATCH 0/6] MODSIGN: Kernel module signing

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Message-ID: <20070214222138.GB4884@us.ibm.com>
Date:	Wed, 14 Feb 2007 16:21:38 -0600
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, herbert.xu@...hat.com,
	linux-kernel@...r.kernel.org, davej@...hat.com,
	arjan@...radead.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 0/6] MODSIGN: Kernel module signing

On Wed, Feb 14, 2007 at 09:59:37PM +0000, David Howells wrote:
> Michael Halcrow <mhalcrow@...ibm.com> wrote:
> 
> > Right now, eCryptfs just delegates its modular exponentiation
> > operations to a userspace daemon. If RSA ever finds its way into the
> > kernel, I might tweak eCryptfs to use that instead for some of the
> > public key operations.
> 
> Am I right in thinking that RSA uses many of the same MPI lib bits
> as DSA?

I would imagine so. Assuming we aren't having to hassle with key
generation (eCryptfs takes care of that in userspace), then RSA is,
more or less, a^b mod c (mpi_mulpowm() and friends).

Mike
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