Frank Denis 9c2b014ea8 std/crypto: use NAF for multi-scalar edwards25519 multiplication
Transforming scalars to non-adjacent form shrinks the number of
precomputations down to 8, while still processing 4 bits at a time.

However, real-world benchmarks show that the transform is only
really useful with large precomputation tables and for batch
signature verification. So, do it for batch verification only.
2020-11-17 17:07:32 -08:00
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