How can I *unlock* a CoreStorage logical-volume without mounting it? I had a damaged disk that's encrypted with CoreStorage / FileVault. DiskWarrior was unable to operate on it while encrypted, obviously (“This is an offline, unavailable Core Storage disk.”); but the diskutil corestorage unlockVolume [UUID] operation both unlocks and mounts the volume.

With a damaged disk like this, I'd really like to avoid mounting the filesystem before working on it — I'd just like to unlock it so I can proceed with recovery tools.

Is there any way to enter the disk's password without causing it to subsequently be mounted by OS X?
Click the Unlock button in the top-right of DiskWarrior and enter the password to unlock the volume