In /etc/libuser.conf, add or correct the following line in its [defaults] section to ensure the system will use the $var_password_hashing_algorithm_pam algorithm for password hashing:
crypt_style = $var_password_hashing_algorithm_pam
Passwords need to be protected at all times, and encryption is the standard method for
protecting passwords. If passwords are not encrypted, they can be plainly read
(i.e., clear text) and easily compromised. Passwords that are encrypted with a weak algorithm
are no more protected than if they are kept in plain text.
This setting ensures user and group account administration utilities are configured to store
only encrypted representations of passwords. Additionally, the crypt_style
configuration option in /etc/libuser.conf ensures the use of a strong hashing
algorithm that makes password cracking attacks more difficult.