crypto: keembay-ocs-hcu - Add HMAC support

Add HMAC support to the Keem Bay OCS HCU driver, thus making it provide
the following additional transformations:
- hmac(sha256)
- hmac(sha384)
- hmac(sha512)
- hmac(sm3)

The Keem Bay OCS HCU hardware does not allow "context-switch" for HMAC
operations, i.e., it does not support computing a partial HMAC, save its
state and then continue it later. Therefore, full hardware acceleration
is provided only when possible (e.g., when crypto_ahash_digest() is
called); in all other cases hardware acceleration is only partial (OPAD
and IPAD calculation is done in software, while hashing is hardware
accelerated).

Co-developed-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: dalessan

drivers/crypto/keembay/Kconfig

@@ -49,7 +49,7 @@ config CRYPTO_DEV_KEEMBAY_OCS_HCU
 	  Control Unit (HCU) hardware acceleration for use with Crypto API.
 
 	  Provides OCS HCU hardware acceleration of sha256, sha384, sha512, and
-	  sm3.
+	  sm3, as well as the HMAC variant of these algorithms.
 
 	  Say Y or M if you're building for the Intel Keem Bay SoC. If compiled
 	  as a module, the module will be called keembay-ocs-hcu.