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

[David Howells]

Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote:

> > 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?
> 
> That's a transform with a specific key.  I don't see why such a
> piece of hardware would even need to be exposed through the crypto
> API which is about generic implementations that can take any
> arbitrary key.

So what if we want to use a key that's stored in a TPM?  I presume then we
can't use the crypto interface, but must rather use the *key* as the primary
interface somehow.

David
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