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

From: David Howells
Date: Mon May 11 2015 - 09:46:14 EST

Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> 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?

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