tree 813c3ec09204f4cd35998aaca752c22ae88beecd
parent bdb6cf9f6fe6d9af905ea34b7c4bb78ea601329e
author Stephan Mueller <smueller@chronox.de> 1459176475 +0200
committer Herbert Xu <herbert@gondor.apana.org.au> 1459859753 +0800

crypto: drbg - set HMAC key only when altered

The HMAC implementation allows setting the HMAC key independently from
the hashing operation. Therefore, the key only needs to be set when a
new key is generated.

This patch increases the speed of the HMAC DRBG by at least 35% depending
on the use case.

The patch is fully CAVS tested.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>