Correct me if I am wrong here, please.
You are wrong. But you're asking in the wrong place go see the nice article on wikipedia.
I did see the article on wikipedia, and it says that full homomorphic encryption is a scientists' wet dream and it has never been achieved.
Well technically it was achieved by Gentry and a few related improvements on that, however those schemes are extremely far from practical.
So for practical usage it has not yet been really achieved. That's what i wanted to say.
Anyway, it would be extremely cool to have homomorphic encryption as it would enable ultimate blockchain compression (there was a topic here claiming that).