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SubjectRe: [PATCH RFC v2 1/2] crypto: add PKE API
Date
Herbert Xu <herbert@gondor.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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