jdgcs/ed25519

Package edwards25519 implements operations in GF(2**255-19) and on an Edwards curve that is isomorphic to curve25519. Package extra25519 converts Ed25519 public and private keys to Curve25519 corresponding keys.

As github.com/agl/ed25519/extra25519 is not maintained anymore, this repo is a backup.

And fixed an issue which is mentioned:https://github.com/agl/ed25519/pull/12/commits/602019f68770b37794c1c42ab7163e0b1488824f

So the import changed, "github.com/agl/ed25519/extra25519" => "github.com/jdgcs/ed25519/extra25519" .