linux-kernel - Re: [PATCH RFC v2 1/2] crypto: add PKE API

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Date:	Mon, 11 May 2015 14:45:27 +0100
From:	David Howells <dhowells@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	dhowells@...hat.com, Tadeusz Struk <tadeusz.struk@...el.com>,
	linux-kernel@...r.kernel.org, keescook@...omium.org,
	jwboyer@...hat.com, richard@....at, steved@...hat.com,
	qat-linux@...el.com, linux-crypto@...r.kernel.org,
	james.l.morris@...cle.com, jkosina@...e.cz,
	zohar@...ux.vnet.ibm.com, davem@...emloft.net, vgoyal@...hat.com
Subject: Re: [PATCH RFC v2 1/2] crypto: add PKE API

Herbert Xu <herbert@...dor.apana.org.au> wrote:

> > + * @capabilities:
> > + *		Specifies what operations are provided by the algorithm
> > + *		implementation.
> 
> Don't do this.  It's a nightmare for the user to have to deal with
> multiple implementations with differing capabilities.
> 
> Make the implementor provide backups/fallbacks.

What if the fallback doesn't exist?  For instance, a H/W contained key is
specifically limited to, say, just sign/verify and the not permitted to be
used for encrypt/decrypt.  How do you provide a fallback given you can't get
at the key?

David
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