--- Day changed Thu Dec 08 2016
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15:59 < rusty2> Hmm, how fixed is secp256k1_ecdh?  We have a PR in lighnting-rfc which suggests we want to point returned: see https://github.com/lightningnetwork/lightning-rfc/pull/43
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16:04 < gmaxwell> Returning the point is philosophically at odds with the design of our interface. Doing so would be unsafe by default and we've seen broken cryptography created by people directly using the point arising from ECDH for things. (e.g. the electrum original 'message encryption' feature).
16:06 < gmaxwell> I believe we discussed taking a hasher function, similar to how we do nonce validation, to enable alternative constructions while remaining secure by default.
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16:36 < rusty> gmaxwell: yes, I think the hashing makes sense.  Pasted your lines w/ reference into the PR, thanks!
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17:25 < ryjz> ryan-c: batch conversion reduces to batch field inversion. Try https://eprint.iacr.org/2008/199
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