&PublicKey{} return newPublicKey(p, pub) } func newPublicKey(pub *PublicKey, pubBytes []byte) (*PublicKey, error) { if l := len(pubBytes); l != publicKeySize { return nil, errors.New("ed25519: bad public key length: " + strconv.Itoa(l)) } // SetBytes checks that the point is on the curve. if _, err := pub.a.SetBytes(pubBytes); err != nil { return nil, errors.New("ed25519: bad public key") } copy(pub.aBytes[:], pubBytes) return pub, nil } // Domain separation prefixes used to disambiguate Ed25519...