Thank you Leonid, that answers my question however I was trying to find the function call for this in PHP where user registers and logs in, so they can verify user name / password. Registration involves calling this function to store the password in tables and login involves comparing the passwords. That's what I'm trying to find in the code, which is actually called as the code executes. 

Same code I can use in my other website to perform registration and login functionality, so I can make UNA as main website.