/** * Resolve the KeyInfoReference Element's URI attribute into a KeyInfo instance. * * @param element * @param baseURI * @param storage * @return the KeyInfo which is referred to by this KeyInfoReference, or null if can not be resolved * @throws XMLSecurityException */ private KeyInfo resolveReferentKeyInfo(Element element, String baseURI, StorageResolver storage) throws XMLSecurityException { KeyInfoReference reference = new KeyInfoReference(element, baseURI); Attr uriAttr = reference.getURIAttr(); XMLSignatureInput resource = resolveInput(uriAttr, baseURI, secureValidation); Element referentElement = null; try { referentElement = obtainReferenceElement(resource); } catch (Exception e) { LOG.debug("XMLSecurityException", e); return null; } if (referentElement == null) { LOG.debug("De-reference of KeyInfoReference URI returned null: {}", uriAttr.getValue()); return null; } validateReference(referentElement); KeyInfo referent = new KeyInfo(referentElement, baseURI); referent.addStorageResolver(storage); return referent; }