Re: [RFC PATCH v2] akcipher: Introduce verify_rsa/verify for public key algorithms

From: Herbert Xu
Date: Fri Jan 25 2019 - 05:00:47 EST

On Fri, Jan 18, 2019 at 11:41:00PM +0300, Vitaly Chikunov wrote:
> a) RSA verify works differently (is it just disguised encrypt),
> b) We have separate wrapper module for it (pkcs1pad). Thus:
> Old API can not be removed. In other words, we can not replace
> .verify_rsa with .verify in these drivers or PKCS1 will not work.
> We can replace .verify_rsa with .verify in pkcs1pad, but there is no
> need for that if we stay with two API calls, which we can't avoid.

I think having two API calls during a transition period is fine.
But it must not be the long-term outcome.

In order to keep existing drivers working, I think we should make
the API wrap the legacy verify_rsa and implement verify directly
on top of it. IOW the driver remains unchanged for now but the
crypto API code should provide a verify API that is implemented
on top of the driver's verify_rsa call.

Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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