x448SharedSecretB64 function
Implementation
Future<String> x448SharedSecretB64(String myPrivB64, String peerPubB64) async {
final priv = Uint8List.fromList(base64Decode(myPrivB64));
final pub = Uint8List.fromList(base64Decode(peerPubB64));
final ss = X448.sharedSecret(privateKey: priv, peerPublicKey: pub);
return base64Encode(ss);
}