Encrypted passwords

Hello All I am using Freeradius1.1.0 with Oracle 10 in my project for user authentication. I need to store encrypted passwords in the database - I would be using Java code to access the database for this purpose. However, I will be sending the password in clear text, to the jradius api to form the access request. This may sound strange, but its true. Is there any way, I can support, such a scenario? - ie. Can I instruct FreeRadius to execute some code(java preferably) before comparing the passwords?? Can some one please point me to some documentation? Or advise me, so that I can go ahead in this regard. Thanks in advance. -Vishwa.