Subgroup based Handshake Distinguisher #2
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jmwample
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… probably incorrect somehow
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fix for subgroup based computational distinguisher and updates / simplifications to the elligator2 interface as a result
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This PR tests for and fixes a computational distinguisher that would allow an observer to differentiate between a representative and a random bytestring.
https://elligator.org/key-exchange
https://loup-vaillant.fr/articles/implementing-elligator
https://www.reddit.com/r/crypto/comments/fd9t3m/elligator_with_x25519_is_broken_what_workaround/