tree 41ba9e7051d1ecd47eb5cd371209229db3202ab6
parent 7b0bac64cd5b74d6f1147524c26216de13a501fd
author Herbert Xu <herbert@gondor.apana.org.au> 1220161647 +1000
committer Herbert Xu <herbert@gondor.apana.org.au> 1230163286 +1100

crypto: hash - Add shash interface

The shash interface replaces the current synchronous hash interface.
It improves over hash in two ways.  Firstly shash is reentrant,
meaning that the same tfm may be used by two threads simultaneously
as all hashing state is stored in a local descriptor.

The other enhancement is that shash no longer takes scatter list
entries.  This is because shash is specifically designed for
synchronous algorithms and as such scatter lists are unnecessary.

All existing hash users will be converted to shash once the
algorithms have been completely converted.

There is also a new finup function that combines update with final.
This will be extended to ahash once the algorithm conversion is
done.

This is also the first time that an algorithm type has their own
registration function.  Existing algorithm types will be converted
to this way in due course.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>