Google is not a privacy company. How can they show you context relevant ads if they can't read your email? So this will probably never happen within Google for political reasons.
But even for technical reasons, it's probably a ways off. Doing encrypted search is a whole other problem on top of encryption. You can't just apply standard search out of the box. Given that Google is just now unveiling an encryption solution, I would not expect GMail (or any google service) to release services built on top of them for a while, even if they wanted to (which they don't).
Unless you are doing hashing and comparing a specific value exactly (e.g. how you would securely store a password hash in a DB) there is no general purpose text indexing package that I know of.
But even for technical reasons, it's probably a ways off. Doing encrypted search is a whole other problem on top of encryption. You can't just apply standard search out of the box. Given that Google is just now unveiling an encryption solution, I would not expect GMail (or any google service) to release services built on top of them for a while, even if they wanted to (which they don't).
Unless you are doing hashing and comparing a specific value exactly (e.g. how you would securely store a password hash in a DB) there is no general purpose text indexing package that I know of.
There is some academic momentum on encrypted search: http://www.cs.berkeley.edu/~dawnsong/papers/se.pdf