SASL Authentication

Hi, Been thinking of writing a SASL class or classes for use with Net_Sieve and Net_SMTP amongst others and am wondering if anyone with experience of SASL has any thoughts on this. My current line of thinking envisages two possible methods: 1. A mostly or all static class which supplies methods for producing the authentication strings eg: response Auth_SASL::cramMD5(user, password, challenge); 2. A class system that inherits from Net_Socket and "takes over" the communication. This would enable the security layer part to be done, though obviously this is much more complex. This could also intercept authentication request based on protocol definitions that it knows about (eg SMTP, IMAP, Sieve etc). Thoughts ? -- Richard Heyes