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Session creation

High level flow of the SDK​

  • Setup the websocket client to connect and communicate with the cloud node
  • Setup the storage client to store mobile keyshare
  • Start a new mpc session
  • Perform MPC actions

Start a new session​

main.dart
import 'dart:io';
import 'package:silent_shard_sdk/silent_shard_sdk.dart' as sdk;

Future<sdk.EcdsaSession> setup([String cloudVerifyingKeyHex = 'SERVER_PUBLIC_KEY_HEX']) async {
  /// The port number is the port number of the cloud node.
  const port = 8080;

  /// The nodeUri is the URI of the cloud node. It is the IP address of the cloud node.
  /// Localhost url used for Android and iOS is shown below.
  /// 10.0.2.2 is the IP address of the Android emulator.
  /// 0.0.0.0 is the IP address of the iOS simulator.
  final nodeUri = Platform.isAndroid ? '10.0.2.2:$port' : '0.0.0.0:$port';

  final cloudClient = sdk.CloudClient(
    baseUri: nodeUri,
    isSecure: false,
  );

  final session = await sdk.createDuoEcdsaSession(
    cloudClient: cloudClient,
    cloudVerifyingKeyHex: cloudVerifyingKeyHex,
    storageClient: sdk.SimpleStorageClient(),
  );

  return session;
}

  • Initialize an ECDSA session with the EcdsaSession class.

  • CloudClient: is a class that handles the WebSocket communication with the cloud node.

  • SessionConfig: is a configuration object that contains the necessary information for the session.

  • CLOUD_NODE_URI is the URI of the cloud node.

  • cloudVerifyingKey is the Hex encoded cloud verifying key (Ed25519 public key).

    • This public key is used to verify the server's signature on each message
    • See example here

You have now successfully set up the session and are ready to start performing MPC actions! 🎉