fn get_aes_key(pubk: &PublicKey, privk: &SecretKey) -> &[u8] {
    let shared = SharedSecret::new( &pubk, &privk).unwrap();
    let sharedkey = shared.as_ref();
    println!("Shared Key: {:?}", sharedkey);
    sharedkey
}
let key1 = generate_keys();
let key2 = generate_keys();
let shared = get_aes_key(&key1.pubkey, &key2.privkey);