howto ecrypt passwords for adduser -batch

["Oliver Bode" <oliver@x509security.com>]

Hi,

The adduser manpage states: "Enter batch mode in which multiple users are
specified on the command-line in a compact format.  By default the password
is  assumed to already be properly encrypted."

My /etc/login.conf file has the line "localcipher=blowfish,6:\"

I assume that I must use the blowfish algorithm with 6 rounds to encrypt the
password prior to using adduser -batch

How do I encrypt the password with blowfish using 6 rounds, and do I need a
key?