This will return null if no authentication statement was
included in the assertion.
Note that this returns either the AuthnContextClassRef or the AuthnConextDeclRef, whose definition overlaps
but is slightly different (consult the specification for more information).
This was done to work around an old bug of Shibboleth ( https://bugs.internet2.edu/jira/browse/SIDP-187 ).
Should no longer be required, please use either getAuthnConextClassRef or getAuthnContextDeclRef.
public getAuthnContext ( ) : string | null | ||
return | string | null | The authentication method. |