This patch adds HMAC. HMAC will be used to sign/verify NVM structures.
Hash algorithms can be selected from those supported
by enum vb2_hash_algorithm (i.e. SHA1, SHA256, or SHA512).
BUG=chrome-os-partner:51907
BRANCH=tot
TEST=make runtests
Change-Id: I6d349bc807874fe2a5512aabcd7fbf67a4eaa40a
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/342880
Reviewed-by: Randall Spangler <rspangler@chromium.org>
