Re: [PATCH 16/18] crypto: talitos - do hw_context DMA mapping outside the requests

[Herbert Xu]

On Tue, Feb 20, 2018 at 11:32:25AM +0000, Horia GeantÄ wrote:
>
> If final/finup is optional, how is the final hash supposed to be retrieved?

Sometimes the computation ends with a partial hash, that's what
export is for.  Also it is completely legal to abandon the hash
state entirely.

> According to documentation, these are the accepted flows (with the option to
> export/import a partial hash b/w update and final/finup):
> 
> .init() -> .update() -> .final()
>             ^    |         |
>             '----'         '---> HASH
> 
> .init() -> .update() -> .finup()
>             ^    |         |
>             '----'         '---> HASH
> 
>            .digest()
>                |
>                '---------------> HASH

The documentation is simply incomplete in this regard.

Cheers,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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