Having Invision Power Board use the Drupal user database

Hi all,

I searched around for a bit of a guide to this, but I could only find how I can import the user list from an Invision database to the Drupal database. However, this I have already done. Now I would like to have Invision and Drupal use the same database, and since Drupal will still be upgraded periodically, I thought of modifying the Invision code and editing the Drupal user database somewhat. Should be easy, albeit tedious work.

There is a problem looming on the horizon, though. While I can have all Invision code refer to the Drupal database, I am not sure if it can then actually read the passwords from there, as the Invision and Drupal passwords might be encoded differently. I figure this is the reason why the migration guide says passwords need to be updated manually. Still, I would like to centralize things instead of having two similar databases running simultaneously.

So my questions are: will I have problems getting the passwords from the database if I just modify the code by changing referrals to the database? And, if so, how should I go about to make Invision fetch the user password data from the Drupal database anyhow? My knowledge of PHP and MySQL is still way too lacking to do things like this on my own, so I would really like some help.

Thanks in advance,