Frank Denis e59dd7eecf std/crypto/x25519: return encoded points directly + ed->mont map
Leverage result location semantics for X25519 like we do everywhere
else in 25519/*

Also add the edwards25519->curve25519 map by the way since many
applications seem to use this to share the same key pair for encryption
and signature.
2020-10-29 14:39:58 -04:00
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