pub fn fn_encrypt_handshake(
    some_message: &Message,
    server_hello: &HandshakeHash,
    server_key_share: &Option<Vec<u8>>,
    psk: &Option<Vec<u8>>,
    group: &NamedGroup,
    client: &bool,
    sequence: &u64
) -> Result<OpaqueMessage, FnError>