sign method

@override Future<Signature> sign(List<int> data, { required KeyPair keyPair, })

Calculates signature for the message.

Implementation

@override
Future<Signature> sign(
  List<int> data, {
  required KeyPair keyPair,
}) async {
  if (usePlugin) {
    try {
      final keyPairData = await keyPair.extract();
      if (keyPairData is! RsaKeyPairData) {
        throw ArgumentError.value(
          keyPair,
          'keyPair',
        );
      }
      final result = await channel.invokeMethod(
        'rsa_pss_sign',
        {
          'data': base64Encode(data),
          'd': base64Encode(keyPairData.d),
          'e': base64Encode(keyPairData.e),
          'n': base64Encode(keyPairData.n),
          'p': base64Encode(keyPairData.p),
          'q': base64Encode(keyPairData.q),
        },
      );
      if (result is! Map) {
        throw StateError('Invalid output from plugin: $result');
      }
      final bytes = base64Decode(result['bytes'] as String);
      return Signature(bytes,
          publicKey: await keyPairData.extractPublicKey());
    } catch (error) {
      usePlugin = false;
    }
  }
  return super.sign(data, keyPair: keyPair);
}