VBoxManage checkmediumpwd

This command is used to check the current encryption password on a DEK encrypted medium or image. See Section 9.28.2, "Encrypting Disk Images".

The syntax is as follows:

VBoxManage checkmediumpwd <uuid|filename>
                                      <pwd file|->

Use <uuid|filename> to supply the UUID or absolute path of the medium or image to be checked.
Use <pwd file|-> to supply the password identifier to be checked. Either specify the absolute pathname of a password file on the host operating system, or - to prompt you for the password on the command line.