Re: IV copy strategy

[Evgeniy Polyakov <johnpol@2ka.mipt.ru>]

On Mon, Nov 19, 2007 at 07:56:55PM +0800, Herbert Xu (herbert@gondor.apana.org.au) wrote:
> > I'm not sure what user will do, when it request chaining, but driver
> > will set CRYPTO_ALG_CIPHER_NOCHAIN itself and return wrong/old in
> > req->info?
> > For IPsec it is not an issue though, but I can not say that for all.
> 
> Drivers that set CRYPTO_ALG_CIPHER_NOCHAIN won't be returned
> if the user requests for a chaining cipher.  This is the same
> as when you request for a cipher with no fallback that the
> system won't return one needing a fallback.
> 
> If you're worried about users doing chaining we could even
> create a new frontend type for it.  So the user would need
> to allocate an object of type crypto_chncipher and use that
> for operations that chain.

Well, this looks like a good way forward.
Not even getting into account, that it requires essentially zero
efforts from driver writers :)

-- 
	Evgeniy Polyakov