SenderKeyDistributionMessageWrapper.fromSerialized constructor

SenderKeyDistributionMessageWrapper.fromSerialized(Uint8List serialized)

Implementation

SenderKeyDistributionMessageWrapper.fromSerialized(Uint8List serialized) {
  try {
    final messageParts =
        ByteUtil.splitTwo(serialized, 1, serialized.length - 1);
    final version = messageParts[0][0];
    final message = messageParts[1];

    if (ByteUtil.highBitsToInt(version) < CiphertextMessage.currentVersion) {
      throw LegacyMessageException(
          'Legacy message: ${ByteUtil.highBitsToInt(version)}');
    }
    if (ByteUtil.highBitsToInt(version) > CiphertextMessage.currentVersion) {
      throw InvalidMessageException(
          'Unknown version: ${ByteUtil.highBitsToInt(version)}');
    }

    final distributionMessages =
        SenderKeyDistributionMessage.fromBuffer(message);
    if (!distributionMessages.hasId() ||
        !distributionMessages.hasIteration() ||
        !distributionMessages.hasChainKey() ||
        !distributionMessages.hasSigningKey()) {
      throw InvalidMessageException('Incomplete message.');
    }

    _serialized = serialized;
    _id = distributionMessages.id;
    _iteration = distributionMessages.iteration;
    _chainKey = Uint8List.fromList(distributionMessages.chainKey);
    _signatureKey = Curve.decodePoint(
        Uint8List.fromList(distributionMessages.signingKey), 0);
  } on InvalidProtocolBufferException catch (e) {
    throw InvalidMessageException(e.message);
  } on InvalidKeyException catch (e) {
    throw InvalidMessageException(e.detailMessage);
  }
}