To implement Blowfish hashes, edit /etc/login.conf and change the passwd_format line so that it looks like this:

:passwd_format=blf:\
Save your change, then rebuild the login database with this command:

cap_mkdb /etc/login.conf
You’ll then have to change all of your user’s passwords so they will get a new Blowfish hash. You can do this by typing:

passwd username
as the superuser. Whatever username you use, that will be the user whose password will be updated. Repeat for all of your users, including the root account.

Once you’re finished, double-check that it worked and you didn’t forget any users:

more /etc/master.passwd
All of the passwords for your users should begin with $2.

Finally, configure the adduser utility to use Blowfish whenever you create a new user by editing /etc/auth.conf. Change the crypt_default line so that it looks like this:

crypt_default=blf