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3 Commits

Author SHA1 Message Date
Theodore Ts'o
a44cd7a054 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>
 2015-05-01 16:56:50 -04:00
Theodore Ts'o
5de0b4d0cd ext4 crypto: simplify and speed up filename encryption 
Avoid using SHA-1 when calculating the user-visible filename when the
encryption key is available, and avoid decrypting lots of filenames
when searching for a directory entry in a directory block.

Change-Id: If4655f144784978ba0305b597bfa1c8d7bb69e63
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
 2015-05-01 16:56:45 -04:00
Michael Halcrow
d5d0e8c720 ext4 crypto: filename encryption facilities 
Signed-off-by: Uday Savagaonkar <savagaon@google.com>
Signed-off-by: Ildar Muslukhov <ildarm@google.com>
Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
 2015-04-12 00:56:17 -04:00