Password length for Hikashop registration

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.29

Hello,
is there any way how to set some rules for password length and complexity when using Hikashop registration?
On my site, I have requirement of 6 chars length in joomla settings and it works fine with joomla registration ( /profil-edit?view=registration - feel free to try it ), but with hikashop registration ( /registracia ), which my customer wants to use exclusively, the registration passes even with 1 char long password...