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Add inverse Elligator2 mapping to Curve25519. #357

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Add inverse Elligator2 mapping to Curve25519. #357

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Commits on Jun 20, 2021

  1. Add inverse Elligator2 mapping to Curve25519.

    @lealanko
    lealanko committed Jun 20, 2021
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Commits on Jun 23, 2021

  1. Optimize elligator_decode by avoiding one square root. 

    The result of the sqrt(2u(u+A)) test can be used directly to compute
the final field element. This optimization was adapted from Loup
Vaillant's Monocypher library.
    @lealanko
    lealanko committed Jun 23, 2021
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