pub unsafe static kSecAttrAccessGroupToken: &'static CFStringAvailable on crate feature
SecItem only.Expand description
which contains items provided by external token (typically smart card). This may be used as a value for kSecAttrAccessGroup attribute. Every application has access to this access group so it is not needed to explicitly list it in keychain-access-groups entitlement, but application must explicitly state this access group in keychain queries in order to be able to access items from external tokens.
See also Apple’s documentation