A key whose value is a data object containing the SHA-1 hash of the code directory.
- macOS 10.6+
This hash can be used as a unique identifier to recognize this specific code in the future. This identifier is tied to the current version of the code, unlike the
k identifier, which remains stable across developer-approved updates. If you are not passing this hash in the attribute dictionary when you call the
Sec function, then you must pass the
k flag to the function as well.