$_mod
$_module_name
$_cdat
$_ddat
$_verify_code
$_signature
$__mod
$_excludes
__construct( $module_name)
get_signature()
check_extrafiles()
check_module_integrity()
get_salt()
is_excluded( $filename)
get_checksum_key( $filename)
get_checksum_value( $filename)
get_checksum_signature( $key, $val)
walk_directory( $dir, $callback)
get_verify_code()
check_checksum_integrity()
parse_cdat()