linux-kernel - Re: [PATCH v2 0/5] crypto: add algif

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Message-ID: <1499937.MpmApGzYrd@tauon.atsec.com>
Date:	Wed, 28 Oct 2015 00:35:30 +0100
From:	Stephan Mueller <smueller@...onox.de>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-crypto@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v2 0/5] crypto: add algif_akcipher user space API

Am Mittwoch, 28. Oktober 2015, 08:15:16 schrieb David Woodhouse:

Hi David,
>
>Absolutely. The interface needs to support *both*.
>
>I've spent a lot of time chasing through userspace stacks, fixing
>broken assumptions that we will *always* have the actual key material
>in a file — and making libraries and applications accept PKCS#11 URIs
>referring to keys in hardware as well as filenames.
>
>I am violently opposed to exposing an API from the kernel which makes
>that *same* fundamental mistake, and ties its users to using *only*
>software keys.
>
>FROM THE BEGINNING, users of this new API should be able to cope with
>the fact that they might not *have* the key material, and that they
>might simply be referring to a key which exists elsewhere. Such as in
>the TPM, or within an SGX software enclave.

Albeit that all sounds like the crown jewel, how do you propose that shall 
happen?

Assume that you have a web server that has a pub and priv key in its current 
configuration -- I guess that is the vast majority of configs.

Can you please elaborate how the process for such a web server shall really 
work?


Ciao
Stephan
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