The following attributes in the service provider extended metadata are used by the SPAuthnContextMapper:
The spAuthncontextMapper property specifies the name of the service provider mapper implementation.
The spAuthncontextClassrefMapping property specifies the map of authentication context class reference and authentication level in the following format:
authnContextClassRef | authlevel [| default]
The spAuthncontextComparisonType property is optional and specifies the method of comparison used to evaluate the requested context classes or statements. Accepted values include:
exact where the authentication context statement in the assertion must be the exact match of, at least, one of the authentication contexts specified.
minimum where the authentication context statement in the assertion must be, at least, as strong (as deemed by the identity provider) one of the authentication contexts specified.
maximum where the authentication context statement in the assertion must be no stronger than any of the authentication contexts specified.
better where the authentication context statement in the assertion must be stronger than any of the authentication contexts specified.
If the element is not specified, the default value is exact.