Converting a CAS2 PasswordHandler to CAS3

This page documents how to convert a CAS2 PasswordHandler to be a native CAS3 AuthenticationHandler. It is an alternative to plugging a CAS2 PasswordHandler directly into CAS3. The intended audience for this page is developers who are familiar with the CAS2 PasswordHandler API and are looking to upgrade that understanding to CAS3. There's another page that documents writing to the CAS3 AuthenticationHandler API outside the context of CAS2.