sha256 method
Implementation
@override
Future<String> sha256(String name, Version version) {
final sha256File =
File("data/packages/$name/$version/package.tar.gz.sha256");
if (!sha256File.existsSync()) {
throw Exception("SHA256 not found for $name $version");
}
final content = sha256File.readAsStringSync();
return Future.value(content.trim());
}