crypto: sha512 - implement base layer for SHA-512

To reduce the number of copies of boilerplate code throughout
the tree, this patch implements generic glue for the SHA-512
algorithm. This allows a specific arch or hardware implementation
to only implement the special handling that it needs.

The users need to supply an implementation of

  void (sha512_block_fn)(struct sha512_state *sst, u8 const *src, int blocks)

and pass it to the SHA-512 base functions. For easy casting between the
prototype above and existing block functions that take a 'u64 state[]'
as their first argument, the 'state' member of struct sha512_state is
moved to the base of the struct.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/sha.h

@@ -77,8 +77,8 @@ struct sha256_state {
 };
 
 struct sha512_state {
-	u64 count[2];
 	u64 state[SHA512_DIGEST_SIZE / 8];
+	u64 count[2];
 	u8 buf[SHA512_BLOCK_SIZE];
 };