Various digest algorithms operate one block at a time and therefore
keep a temporary buffer of partial blocks.  This buffer does not need
to be initialised since there is a counter which indicates what is and
isn't valid in it.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Fix processing of messages larger than 2 * SHA256_BLOCK_SIZE.
Signed-off-by: NJan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Add support for the hardware accelerated sha256 crypto algorithm.
Signed-off-by: NJan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>