tree 33b1ed63aa4e51f6e49fda5bd6ccb204e1e8fdab
parent 92e2531dca068bdb403b137f5699a92e512085c4
author bigbiff bigbiff <bigbiff@teamw.in> 1471643025 -0400
committer Ethan Yonker <dees_troy@teamw.in> 1497701145 -0500

twrpDigest refactor

This patch is to refactor twrpDigest using polymorphism
and inheritance to use the same call patterns for creating and
reading a digest. Now a library.
Use SHA2 from libcrypto. SHA2 is default if device has libcrypto.

Change string MD5 everywhere to use digest or Digest instead. Updated
string tags to digest. Translation will be required.

Switch out digest code into a driver class from partitionmanager.

SHA2 is better for digest creation due to decreased collision space
compared to MD5 and SHA1.

See https://en.wikipedia.org/wiki/SHA-2

Change-Id: I74b5546789990b12aa4ce2e389d25f80a3fe213f