Increase the master key size to 256 bits
NIAP certification finds that the 128 bit key size is insufficient
and requires a 256 bit key size. This change increases the
size of new master keys to 256 bits. Any existing master keys are
not changed and continue to be supported.
A new BlobType, TYPE_MASTER_KEY_AES256, is used to signal when a
key is the new larger size.
Bug: 121272336
Test: (1) Ran Keystore CTS tests against Walleye,
no new test failures observed.
(2) Created keys in build without change, moved to build
with change and verified old key could be loaded and
used. Also, a new key could be created with the
increased size and could be reloaded after a reboot.
Change-Id: Ie120f514bc1db7a8a9eeaaf842178bafe128ee19
Merged-In: If00331c303e6cc7bc95a2ab624d0e19bec4e587e
4 files changed