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E4CRYPT(8)                  System Manager's Manual                 E4CRYPT(8)
NAME
       e4crypt - ext4 filesystem encryption utility
SYNOPSIS
       e4crypt add_key -S [ -k keyring ] [-v] [-q] [ -p pad ] [ path ... ]
       e4crypt new_session
       e4crypt get_policy path ...
       e4crypt set_policy [ -p pad ] policy path ...
DESCRIPTION
       e4crypt performs encryption management for ext4 file systems.
COMMANDS
       e4crypt add_key [-vq] [-S salt ] [-k keyring ] [ -p pad ] [ path ... ]
              Prompts the user for a passphrase and inserts it into the speci-
              fied keyring.  If no keyring is specified, e4crypt will use  the
              session  keyring  if it exists or the user session keyring if it
              does not.
              The salt argument is interpreted in a number of different  ways,
              depending  on how its prefix value.  If the first two characters
              are "s:", then the rest of the argument will be used as an  text
              string  and used as the salt value.  If the first two characters
              are "0x", then the rest of the argument will be parsed as a  hex
              string  as  used  as the salt.  If the first characters are "f:"
              then the rest of the argument will be interpreted as a  filename
              from  which  the  salt value will be read.  If the string begins
              with a '/' character, it will similarly be treated as  filename.
              Finally,  if  the  salt  argument can be parsed as a valid UUID,
              then the UUID value will be used as a salt value.
              The keyring argument specifies the  keyring  to  which  the  key
              should be added.
              The  pad  value specifies the number of bytes of padding will be
              added to directory names for obfuscation  purposes.   Valid  pad
              values are 4, 8, 16, and 32.
              If  one  or more directory paths are specified, e4crypt will try
              to set the policy of those directories to use the key just added
              by the add_key command.
       e4crypt get_policy path ...
              Print  the  policy  for the directories specified on the command
              line.
       e4crypt new_session
              Give the invoking process (typically  a  shell)  a  new  session
              keyring, discarding its old session keyring.
       e4crypt set_policy [ -p pad ] policy path ...
              Sets  the  policy  for  the directories specified on the command
              line.  All directories must be empty to set the policy;  if  the
              directory  already  has a policy established, e4crypt will vali-
              date that the policy matches what was specified.  A policy is an
              encryption  key  identifier consisting of 16 hexadecimal charac-
              ters.
AUTHOR
       Written by Michael Halcrow <mhalcrow AT google.com>, Ildar Muslukhov <mus-
       lukhovi AT gmail.com>, and Theodore Ts'o <tytso AT mit.edu>
SEE ALSO
       keyctl(1), mke2fs(8), mount(8).
E2fsprogs version 1.45.6          March 2020                        E4CRYPT(8)