This patch simply replace all occurrence of HMAC IPAD/OPAD value by their
define.
Signed-off-by: NCorentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>