commit a44cd7a05496d60fd2ba8cca080e3db8f481549b
author Theodore Ts'o <tytso@mit.edu> Fri May 01 16:56:50 2015 -0400
committer Theodore Ts'o <tytso@mit.edu> Fri May 01 16:56:50 2015 -0400
tree dd8d05d845817e4a429804d8ffe09dd68b6881e6
parent 5de0b4d0cd153c471640b13aae6ae6d18d0a4603

ext4 crypto: add padding to filenames before encrypting

This obscures the length of the filenames, to decrease the amount of
information leakage.  By default, we pad the filenames to the next 4
byte boundaries.  This costs nothing, since the directory entries are
aligned to 4 byte boundaries anyway.  Filenames can also be padded to
8, 16, or 32 bytes, which will consume more directory space.

Change-Id: Ibb7a0fb76d2c48e2061240a709358ff40b14f322
Signed-off-by: Theodore Ts'o <tytso@mit.edu>