[curves] Edwards: recovering x from y

Nathaniel McCallum npmccallum at redhat.com
Fri Oct 23 05:57:46 PDT 2015

Is there a generic way to do this?

The official Ed25519 code (in python) has a function for this but it
depends on some constants and I can't infer what they are doing. In
particular, I'd like to recover x from y with Ed448.

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