How WordPress encrypt password? [duplicate]

Possible Duplicate:
How to validate WordPress generated password in DB using PHP?

I am working with site that is done with WordPress, and I need to add some parts that are outside WP, and to check user login, but I can’t find how WP is encrypting password before it writes it in DB…

I tried with md5 but it’s not…

Does anyone know how to check password outside WP, without using it’s pluggins/checkers, clear PHP code?

The password encryption library is in /wp-includes/class-phpass.php. It is the Portable PHP Password hashing framework.