Session creation

High level flow of the SDK

• Setup the websocket client to connect and communicate with the cloud node
• Setup the storage provider for mobile keyshare persistence and sync capabilities
• Create a message signer for secure message exchange between mobile and cloud node
• Start a new mpc session
• Perform MPC actions

Create a new React Native project

---

Skip this section if you already have a React Native project.

Terminal

npx @react-native-community/cli@latest init SilentMPC

After the project is created, install @silencelaboratories/silent-shard-sdk using the instructions from the Installation Guide

Start a new session

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ECDSA

App.tsx

import {
  CloudWebSocketClient,
  createEcdsaDuoSession,
  InMemoryStorageProvider,
  type MessageSigner,
} from '@silencelaboratories/silent-shard-sdk';

const CLOUD_NODE_URI = 'localhost:8080';
const cloudVerifyingKey = 'SERVER_PUBLIC_KEY_HEX';
const cloudClient = new CloudWebSocketClient(CLOUD_NODE_URI, false);
const storage = new InMemoryStorageProvider();

export const initSession = async () => {
  const messageSigner: MessageSigner = {
    publicKeyB64: 'YOUR_PUBLIC_KEY',
    sign: async (message: string) => {
      // Implement your signing logic here
      // For example, using a cryptographic library to sign the message or in the TEE
      console.log('Signing message:', message);
      return '';
    },
    keyType: 'ED25519', // your key type
  };
  const session = await createEcdsaDuoSession({
    client: cloudClient,
    cloudVerifyingKey: cloudVerifyingKey,
    storage: storage,
    messageSigner,
  });
  console.log('Session created successfully');
  return session;
};

EdDSA

App.tsx

import {
  CloudWebSocketClient,
  createEddsaDuoSession,
  InMemoryStorageProvider,
  type MessageSigner,
} from '@silencelaboratories/silent-shard-sdk';

const CLOUD_NODE_URI = 'localhost:8080';
const cloudVerifyingKey = 'SERVER_PUBLIC_KEY_HEX';
const cloudClient = new CloudWebSocketClient(CLOUD_NODE_URI, false);
const storage = new InMemoryStorageProvider();

export const initSession = async () => {
  const messageSigner: MessageSigner = {
    publicKeyB64: 'YOUR_PUBLIC_KEY',
    sign: async (message: string) => {
      // Implement your signing logic here
      // For example, using a cryptographic library to sign the message or in the TEE
      console.log('Signing message:', message);
      return '';
    },
    keyType: 'ED25519', // your key type
  };
  const session = await createEddsaDuoSession({
    client: cloudClient,
    cloudVerifyingKey: cloudVerifyingKey,
    storage: storage,
    messageSigner,
  });
  console.log('Session created successfully');
  return session;
};

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

• IStorageProvider: is a class manager for storing and retrieving MPC keyshares through a standardized interface.

• MessageSigner: is a class that handles the signing of messages for secure communication between mobile and cloud node.

• EcdsaSession: is the class that facilitates all actions for ECDSA wallets.

• 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! 🎉