Stealth Addressing Contract

Would it be straightforward to use an Ethereum contract to duplicate the bitcoin/SX stealth address function to have ether sent to private addresses derived from a public key? Perhaps Mr. Receiver could ask (pay) the same contract whether he had any new receipts? Putting stealth into a contract would appear to have benefits for wallet/client simplicity.
c.f., https://en.bitcoin.it/wiki/Sx/Stealth
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