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There does not seem to be a way to access the string constants used with the Secure Enclave, like:
and others. However it is worth noting that I can not find the value for these constants in Apple's docs either.
I am able to retrieve them with:
IntPtr ptr = ObjCRuntime.Dlfcn.dlopen (Constants.SecurityLibrary, 0);
var kSecAttrTokenID = Dlfcn.GetStringConstant (ptr, "kSecAttrTokenID");
var kSecAttrTokenIDSecureEnclave = Dlfcn.GetStringConstant (ptr, "kSecAttrTokenIDSecureEnclave");
Our docs  only say this about using Secure Enclave:
"Support for generating and using keys inside the secure enclave (via the kSecAttrTokenIDSecureEnclave attribute)."
yet with no indication as to how to access the kSecAttrTokenIDSecureEnclave attribute, or other needed keys like kSecAttrTokenID.
Fixed in maccore/master 2cc284dc8542ba675e9757f943b625b5c70ac138