How to retrieve the password from active directory?

Question

I know that there is no way to get the password in plain text, because it is written in hashed form on AD, but is there a way to get the hashed password from active directory?

I need to validate user against the AD, and then add him to DB, so I need his password, and also I need to know the encryption method that AD uses, so I can encrypt password myself when validating password against DB alone.

Thanks.