my $user = $self->get_user($username);
my $message = join ' ', $username, $user->{passphrase}, @data;
hmac_sha1_base64 $message, $self->{hmackey};
my $user = $self->get_user($username);
my $message = join ' ', $username, $user->{passphrase}, @data;
hmac_sha1_base64 $message, $self->{hmackey};