Function server_handshake_ntor_v1 

fn server_handshake_ntor_v1<R, T>(
    rng: &mut R,
    msg: T,
    keys: &[NtorSecretKey],
) -> Result<(NtorHkdfKeyGenerator, Vec<u8>), RelayHandshakeError>
where
    R: RngCore + CryptoRng,
    T: AsRef<[u8]>,

Perform a server-side ntor handshake.

On success returns a key generator and a server onionskin.