Create dbca template from db without username/password

Hi

I'm working on tool that would make simple inventory of oracle databases and one of the ideas is to create templates from each db using dbca and gather them into some central location "just in case". Everything works perfectly fine, but dbca requires parameters -sysDBAUserName and -sysDBAPassword to be provided. This is not possible from security reasons to hardcode any username and passwords into any scripts. So to make this tool able to run in the background it would have to use "/ as sysdba" connection and OS authentication. Is it possible somehow to run dbca using "/ as sysdba"