initiateSession method

@override Future<Map<String, dynamic>> initiateSession(CryptoPeerCapabilities localCapabilities)

Initiates a session establishment process with remote peer. Returns the handshake message to send to the remote peer.

Implementation

@override
Future<Map<String, dynamic>> initiateSession(
    CryptoPeerCapabilities localCapabilities) async {
  // Generate ECDH key pair for session
  final keyPairData = await ECDHKeyExchange.generateKeyPair();
  _keyExchange = ECDHKeyExchange(
    InputECDHKeyExchange(
      parent: InputKeyExchangeBase(
        algorithm: KeyExchangeAlgorithm.ecdh,
        expirationDate: DateTime.now().add(const Duration(hours: 24)),
        expirationTimes: null,
      ),
      publicKey: keyPairData['publicKey']!,
      privateKey: keyPairData['privateKey']!,
      curve: keyPairData['curve']!,
    ),
  );

  // Create handshake message
  final handshakeMessage = _negotiator.createHandshakeMessage(localCapabilities);

  // Add key exchange information
  handshakeMessage['keyExchangeData'] = {
    'type': 'ecdh',
    'publicKey': _keyExchange!.getPublicKey(),
    'curve': _keyExchange!.curve,
  };

  return handshakeMessage;
}