The Unlock() method

Unlock (IN  s     passphrase,
        IN  a{sv} options,
        OUT o     cleartext_device);

Tries to unlock the encrypted device using passphrase.

If the device in question is referenced in a system-wide configuration file (such as the /etc/crypttab file), then name, options and passphrase (if available) is used from that file after requesting additional authorization.

If an empty passphrase should be used to unlock the device, it has to be passed using the keyfile_contents parameter. Empty string passed as passphrase means "Use the passphrase from the configuration file".

If the device is removed without being locked (e.g. the user yanking the device or pulling the media out) the cleartext device will be cleaned up.

The Lock() method

Lock (IN  a{sv} options);

Locks the encrypted device.

The ChangePassphrase() method

ChangePassphrase (IN  s     passphrase,
                  IN  s     new_passphrase,
                  IN  a{sv} options);

Changes the passphrase to new_passphrase. An existing passphrase is required.

If old_keyfile_contents or new_keyfile_contents are given, they take precedence over the corresponding passphrase parameters individually.

If the device in question is referenced in a system-wide configuration file (such as the /etc/crypttab file) and this configuration references the passphrase, it is not automatically updated.

The Resize() method

Resize (IN  t     size,
        IN  a{sv} options);

Resizes the encrypted device. The device must be unlocked. The given size is the target size for the cleartext device.

You need to specify either passphrase or keyfile_contents for LUKS 2 devices that don't have verified key loaded in kernel keyring.

Since 2.8.0

The "ChildConfiguration" property

ChildConfiguration  readable   a(sa{sv})

Configuration items belonging to the

clear text device of this encrypted block device and its children. This is also valid when this block device is currently locked and there is no clear text device for it. It works via the 'track-parents' options of AddConfigurationItem(), which see.

The "HintEncryptionType" property

HintEncryptionType  readable   s

If not blank, the type of the encryption used to encrypt this device.

This is set during successful unlocking of an encrypted device. It is required for encryption types which can only be determined by decrypting the device (for example TCRYPT), but is used for all encryption types for consistency reasons.

The "MetadataSize" property

MetadataSize  readable   t

Size of the metadata on the encrypted device in bytes

The "CleartextDevice" property

CleartextDevice  readable   o

For an unlocked device, the object path of its cleartext device.