hash import/export

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Herbert,

I wonder if you can clear something up about the hash export/import
functionality.  In:

http://lists.infradead.org/pipermail/linux-arm-kernel/2015-May/344120.html

you seem to imply that the exported and imported state can't be defined
by the driver.

Boris tells me, "AFAIR, crypto users are expecting md5/sha1/sha256_state
depending on the crypto req state they are exporting".

>From what I can see, there is only one place in the core crypto code
where hash state is exported and imported, and that's in hash_accept(),
and that's always done with the same driver.  The only other place is
in the marvell cesa driver itself when initialising the hmac state.

Is there any reason a driver can't define its own structure to be
exported here which can be shared between each of the different methods
it supports?

Thanks.

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