A key whose value is a Boolean indicating whether untrusted certificates should be returned.
- iOS 2.0+
- macOS 10.6+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
The corresponding value is of type
CFBoolean. If this attribute is provided with a value of
k, only certificates that can be verified back to a trusted anchor are returned. If this value is
k or the attribute is not provided, then both trusted and untrusted certificates may be returned.