rawSecret function
return a ECPoint data secret
Implementation
ECPoint rawSecret(String privateString, String publicString) {
final privateKey = loadPrivateKey(privateString);
final publicKey = loadPublicKey(publicString);
final secret = scalar_multiple(
privateKey.d!, publicKey.Q!)!; //publicKey.Q * privateKey.d;
//final secret = publicKey.Q * privateKey.d;
return secret;
}