encryptDocument method

Future<DocumentDto> encryptDocument(String dataOwnerId, Set<String> delegations, DecryptedDocumentDto document)

Implementation

Future<DocumentDto> encryptDocument(String dataOwnerId, Set<String> delegations, DecryptedDocumentDto document) async {
  var eks = document.encryptionKeys;
  Uint8List? secret;
  if (!eks.entries.any((s) => s.value.isNotEmpty)) {
    secret = Uint8List.fromList(List<int>.generate(32, (i) => random.nextInt(256)));
    final secretForDelegates = await Future.wait((<String>{...delegations, dataOwnerId})
        .map((String d) async => Tuple2(d, await this.crypto.encryptAESKeyForHcp(dataOwnerId, d, document.id, secret!.toHexString()))));

    eks = {
      ...eks,
      ...Map.fromEntries(
          secretForDelegates.map((t) => MapEntry(t.item1, <DelegationDto>{DelegationDto(owner: dataOwnerId, delegatedTo: t.item1, key: t.item2.item1)})))
    };
  } else {
    secret = (await this.crypto.decryptEncryptionKeys(dataOwnerId, document.encryptionKeys)).firstOrNull?.formatAsKey().fromHexString();
  }

  if (secret == null) {
    throw FormatException("Cannot get encryption key for ${document.id} and hcp $dataOwnerId");
  }

  Tuple2 t = await this.marshaller(document);

  DocumentDto sanitizedDocument = t.item1;
  final Uint8List marshalledData = t.item2;

  sanitizedDocument.encryptionKeys = eks;
  sanitizedDocument.encryptedSelf = base64.encoder.convert(marshalledData.encryptAES(secret));

  return sanitizedDocument;
}