/**
     * Constructor.
     * @param auth The SAML authentication.
     */
    public SamlCredential(final Auth auth) {
        attributes = auth.getAttributes();
        nameId = auth.getNameId();
        nameIdFormat = auth.getNameIdFormat();
        sessionIndex = auth.getSessionIndex();
        nameidNameQualifier = auth.getNameIdNameQualifier();
        nameidSPNameQualifier = auth.getNameIdSPNameQualifier();