Add HCTR2 as an allowed mode for filename encryption

HCTR2 is a wide-block encryption mode intended to solve a pre-existing
cryptographic weakness due to IV reuse in filename encryption.

Bug: 233652475
Change-Id: Ibae5611db5b5dc99942de45110d29fd4d42fd17e
Test: Boot using an Android kernel with HCTR2 support and verify that
  "fscrypt : AES-256-HCTR2" appears in the kernel log.
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
1 file changed