Migrate WordPress users (with passwords) to DotNetNuke

Migrate WordPress users (with passwords) to DotNetNuke

We are thinking about moving a site from WordPress to DNN. The WP site has
81 users and I'm wondering if I can avoid having them create new passwords
when the DNN site goes live. I don't know what plug-in (or if I need one)
I'll be using for DNN user management yet (I'm new to DNN). I know the WP
site is just using the built-in user list, with the "Members Only" plugin
to require log-in.
I imagine I can get access to whatever format WP saves the passwords as...
but is this likely to be the same hash algorithm that DNN (or a popular
plugin) would use, and do I have easy access to any salt used?
It isn't too hard for users to reset their passwords, and is good practice
for them to change them from time to time anyway... Mostly, if it is easy
for me to avoid it, then I would like to try. If not a simple process, not
going to bother.