tree 37b356f793585a15dad444d5f811f2a1520f4200
parent c62b34c3ba6127eeacf656308ed7d153e054e0db
author Ethan Yonker <dees_troy@teamw.in> 1393443368 -0600
committer Ethan Yonker <dees_troy@teamw.in> 1393443455 -0600

Check crypto footer before offering to decrypt

Verify that we have a valid footer with proper magic before
setting things up for decryption to help prevent user confusion
when dealing with data partitions that fail to mount. Also check
to make sure that the block device for /data is present.

Change-Id: Ie87818fe4505a8bf71df7d3934c114e7328ef3ca