With FS_ENCRYPTION_MODE_PRIVATE (AES-256-XTS inline encryption), add support for the IV_INO_LBLK_32 IV generation method which adds the SipHash of the inode number to the file logical block number mod 2^32. The SipHash key is computed as SHA-256(master_key). Change-Id: I655e1ac45559d1f327da034b1b64ce55b9ac1597 Signed-off-by: Eric Biggers <ebiggers@google.com>