Frank Denis f3667e8a80 std/crypto/25519: do cofactored ed25519 verification
This is slightly slower but makes our verification function compatible
with batch signatures. Which, in turn, makes blockchain people happy.
And we want to make our users happy.

Add convenience functions to substract edwards25519 points and to
clear the cofactor.
2020-10-15 18:49:10 -04:00
..
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