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lib/utils/file.dart

@@ -0,0 +1,9 @@
+import 'dart:io';
+
+import 'package:crypto/crypto.dart';
+
+Future<String> calculateFileSha256(File file) async {
+  final bytes = await file.readAsBytes();
+  final digest = sha256.convert(bytes);
+  return digest.toString();
+}