From: "Ted Ts'o" <tytso@mit.edu>
To: "Miloslav Trmač" <mitr@redhat.com>
Cc: Herbert Xu <herbert@gondor.hengli.com.au>,
linux-crypto@vger.kernel.org,
Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>,
Neil Horman <nhorman@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/19] RFC, v2: "New" /dev/crypto user-space interface
Date: Fri, 20 Aug 2010 09:56:12 -0400 [thread overview]
Message-ID: <20100820135612.GC4053@thunk.org> (raw)
In-Reply-To: <1282293963-27807-1-git-send-email-mitr@redhat.com>
On Fri, Aug 20, 2010 at 10:45:43AM +0200, Miloslav Trmač wrote:
> Hello, following is a patchset providing an user-space interface to
> the kernel crypto API. It is based on the older, BSD-compatible,
> implementation, but the user-space interface is different.
What's the goal of exporting the kernel crypto routines to userspace,
as opposed to just simply doing the crypto in userspace? Is it to
access hardware crypto accelerators? (1) I wasn't aware the kernel
crypto routines actually used crypto accelerators, and (2) more often
than not, by the time you take into account the time to move the
crypto context as well as the data into kernel space and back out, and
after you take into account price/performance, most hardware crypto
accellerators have marginal performance benefits; in fact, more often
than not, it's a lose.
If the goal is access to hardware-escrowed keys, don't we have the TPM
interface for that already?
So I'm bit at a list what's the whole point of this patch series.
Could you explain that in the documentation, please? Especially for
crypto, explaining when something should be used, what the threat
model is, etc., is often very important.
Thanks, regards,
- Ted
next prev parent reply other threads:[~2010-08-20 14:15 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-20 8:45 [PATCH 00/19] RFC, v2: "New" /dev/crypto user-space interface Miloslav Trmač
2010-08-20 8:45 ` [PATCH 01/19] User-space API definition Miloslav Trmač
2010-08-20 12:48 ` Stefan Richter
2010-08-21 7:35 ` Nikos Mavrogiannopoulos
2010-08-21 9:11 ` Miloslav Trmac
2010-08-20 17:12 ` Randy Dunlap
2010-08-21 13:09 ` Kyle Moffett
2010-08-21 14:54 ` Nikos Mavrogiannopoulos
2010-08-22 10:22 ` David Howells
2010-09-03 9:18 ` Herbert Xu
2010-09-03 9:34 ` Nikos Mavrogiannopoulos
2010-09-03 15:20 ` Nikos Mavrogiannopoulos
2010-08-20 8:45 ` [PATCH 02/19] Add CRYPTO_USERSPACE config option Miloslav Trmač
2010-08-20 8:45 ` [PATCH 03/19] Add libtommath headers Miloslav Trmač
2010-08-20 8:45 ` [PATCH 04/19] Add libtomcrypt headers Miloslav Trmač
2010-08-20 8:45 ` [PATCH 05/19] Add internal /dev/crypto implementation headers Miloslav Trmač
2010-08-20 8:45 ` [PATCH 06/19] Add ioctl() argument and attribute handling utils Miloslav Trmač
2010-08-20 12:59 ` Stefan Richter
2010-08-21 2:15 ` Miloslav Trmac
2010-08-21 7:15 ` Stefan Richter
2010-08-20 8:45 ` [PATCH 07/19] Add crypto API utilities Miloslav Trmač
2010-08-20 8:45 ` [PATCH 08/19] Add per-process and per-user limits Miloslav Trmač
2010-08-20 8:45 ` [PATCH 09/19] Add libtommath implementation Miloslav Trmač
2010-08-20 8:45 ` [PATCH 10/19] Add libtomcrypt implementation Miloslav Trmač
2010-08-20 8:45 ` [PATCH 10/19] Add libtommath implementation Miloslav Trmač
2010-08-20 8:45 ` [PATCH 11/19] Add algorithm properties table Miloslav Trmač
2010-08-20 8:45 ` [PATCH 12/19] Add DH implementation and pubkey abstraction layer Miloslav Trmač
2010-08-20 8:45 ` [PATCH 13/19] Add /dev/crypto auditing infrastructure Miloslav Trmač
2010-08-20 8:45 ` [PATCH 14/19] Add most operations on key objects Miloslav Trmač
2010-08-20 8:45 ` [PATCH 15/19] Add key wrapping operations Miloslav Trmač
2010-08-20 8:46 ` [PATCH 16/19] Add helpers for zero-copy userspace access Miloslav Trmač
2010-08-20 8:46 ` [PATCH 17/19] Add session operations Miloslav Trmač
2010-08-20 8:46 ` [PATCH 18/19] Add ioctl handlers Miloslav Trmač
2010-08-20 8:46 ` [PATCH 19/19] Finally, add the /dev/crypto device Miloslav Trmač
2010-08-20 13:56 ` Ted Ts'o [this message]
2010-08-20 17:03 ` [PATCH 00/19] RFC, v2: "New" /dev/crypto user-space interface Nikos Mavrogiannopoulos
2010-08-20 23:48 ` Ted Ts'o
2010-08-23 6:39 ` Tomas Mraz
2010-08-21 17:08 ` Arnd Bergmann
2010-08-22 7:52 ` Nikos Mavrogiannopoulos
2010-08-23 8:09 ` Arnd Bergmann
2010-08-23 9:34 ` Nikos Mavrogiannopoulos
2010-08-25 6:20 ` Pavel Machek
2010-08-25 6:44 ` Tomas Mraz
2010-08-25 15:28 ` Miloslav Trmac
[not found] <1291324238.1127211282578687312.JavaMail.root@zmail07.collab.prod.int.phx2.redhat.com>
2010-08-23 16:03 ` Miloslav Trmac
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