Update file upload API

lib/file_upload_manager.dart

@@ -70,13 +70,13 @@ class FileUploadManager {
 
     final metadata = jsonEncode(file.getMetadata());
     final encryptedMetadata =
-        CryptoUtil.encryptDataToData(utf8.encode(metadata), key);
+        await CryptoUtil.encryptDataToData(utf8.encode(metadata), key);
     final data = {
       "fileObjectKey": fileObjectKey,
       "thumbnailObjectKey": thumbnailObjectKey,
       "metadata": encryptedMetadata,
       "encryptedKey": encryptedKey,
-      "iv": iv,
+      "encryptedKeyIV": iv,
     };
     return _dio
         .post(
@@ -93,7 +93,7 @@ class FileUploadManager {
       file.updationTime = data["updationTime"];
       file.ownerID = data["ownerID"];
       file.encryptedKey = encryptedKey;
-      file.iv = iv;
+      file.encryptedKeyIV = iv;
       return file;
     });
   }

lib/utils/crypto_util.dart

@@ -68,9 +68,9 @@ class CryptoUtil {
         Configuration.instance.getTempDirectory() + Uuid().v4();
     return encryptDataToFile(source, destinationPath, key).then((value) {
       final file = io.File(destinationPath);
-      final data = file.readAsStringSync(encoding: utf8);
+      final data = file.readAsBytesSync();
       file.deleteSync();
-      return data;
+      return base64.encode(data);
     });
   }
 
@@ -90,13 +90,13 @@ class CryptoUtil {
     return Computer().compute(runDecryptFileToData, param: args);
   }
 
-  static Future<String> decryptDataToData(String source, String key) {
+  static Future<Uint8List> decryptDataToData(String source, String key) {
     final sourcePath = Configuration.instance.getTempDirectory() + Uuid().v4();
     final file = io.File(sourcePath);
-    file.writeAsStringSync(source);
+    file.writeAsBytesSync(base64.decode(source));
     return decryptFileToData(sourcePath, key).then((value) {
       file.deleteSync();
-      return utf8.decode(value);
+      return value;
     });
   }
 }