tree 57c29e100d399530f239961857c47598bb471b19
parent 36ee836d2f6e6df59d6a20a69421639bacf25559
author Alex Klyubin <klyubin@google.com> 1427500424 -0700
committer Alex Klyubin <klyubin@google.com> 1427745203 -0700

Add HmacSHA256 backed by AndroidKeyStore.

This also adds the MAC length constraint on imported HMAC keys. HMAC
doesn't work without this constraint at the moment.

Bug: 18088752
Change-Id: I8613f58f5d2a84df00bcf6179d13e30619440330