MacOS Extended (Journaled, Encrypted) uses h/w encryption? I have a LaCie 2big, connected via Thunderbolt 2.

When I select as a disk-partition MacOS Extended (Journaled, Encrypted), does that uses some type of hardware encryption or is it all software?
Using this option, you'll endup with a whole disk encryption. 

It uses OSX CoreStorage volume management technology and XTS-AES 128-bit encryption, so it's software. 



Edit : As pointed Alan Shutko, since 2011 Intel added an Intruction set to intel processor to do AES encryption.