Why not just create a database to store your user id and passwords for the page/site and use DBI and Server Side Sessions to verify. Something like below:

sub authenticate {
  my $username = shift;
  my $password = shift; 
 
  return 0 unless $username && $password; 

  my $dbh = DBI->connect("DBI:mysql:[DATABASE NAME]:[HOSTNAME]"
                         "*****", "*****", { RaiseError => 1 }) or die
+ $DBI::errstr;

  my $sth = $dbh->prepare("SELECT id from table 
                            WHERE name = ? AND pass = ? LIMIT 1");

  $sth->execute($username, $password);

  my ( $id ) = $sth->fetchrow_array();
  $dbh->disconnect; 

  return ($id) ? 1 : 0
}
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