ring::agreement::X25519

pub static X25519: Algorithm = agreement::Algorithm{i:
                         ec::AgreementAlgorithmImpl{public_key_len:
                                                        X25519_ELEM_SCALAR_PUBLIC_KEY_LEN,
                                                    elem_and_scalar_len:
                                                        X25519_ELEM_SCALAR_PUBLIC_KEY_LEN,
                                                    nid: 948,
                                                    generate_private_key:
                                                        x25519_generate_private_key,
                                                    public_from_private:
                                                        x25519_public_from_private,
                                                    ecdh: x25519_ecdh,},}

X25519 (ECDH using Curve25519) as described in RFC 7748.

Everything is as described in RFC 7748. Key agreement will fail if the result of the X25519 operation is zero; see the notes on the "all-zero value" in RFC 7748 section 6.1.