Virtual sites + certificate [newbie]

Hello,

I wonder if there is some way in having on the *same* IP multiple
virtual websites www.domain.name, www.domain2.name and so on having each
of them their corresponding SSL certificate for https access on same
standard server port 443.

If I do remember well, the whole packet is ciphered with certificate
public-key and hence cannot be deciphered to know the virtual domain
name without relying only on IP + port, isn't it?

Now, if I'm still right, I think one could implement a module
deciphering each 443-port packet against all known private key
certificate to know the virtual domain and *then* access corresponding
contents.

I'm not planning running a dozen web-sites, only a few ones so
performance should not be too badly hit. Any suggestion or piece of
information, howto, ... ?

Thanks
Xavier Perseguers