/**
* Method engineResolvePublicKey
*
* @param element
* @param BaseURI
* @param storage
* @return null if no {@link PublicKey} could be obtained
* @throws KeyResolverException
*/
public PublicKey engineResolvePublicKey(Element element, String BaseURI, StorageResolver storage)
throws KeyResolverException {
if (this._rsaKeyElement == null) {
boolean weCanResolve = this.engineCanResolve(element, BaseURI, storage);
if (!weCanResolve || (this._rsaKeyElement == null)) {
return null;
}
}
try {
RSAKeyValue rsaKeyValue = new RSAKeyValue(this._rsaKeyElement, BaseURI);
return rsaKeyValue.getPublicKey();
} catch (XMLSecurityException ex) {
cat.debug("XMLSecurityException", ex);
}
return null;
}
/**
* Method engineCanResolve
*
* @param element
* @param BaseURI
* @param storage
* @return
*/
public boolean engineCanResolve(Element element, String BaseURI, StorageResolver storage) {
cat.debug("Can I resolve " + element.getTagName());
if (element == null) {
return false;
}
boolean isKeyValue = XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYVALUE);
boolean isRSAKeyValue = XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_RSAKEYVALUE);
if (isKeyValue) {
try {
Element nscontext =
XMLUtils.createDSctx(element.getOwnerDocument(), "ds", Constants.SignatureSpecNS);
this._rsaKeyElement =
(Element)
XPathAPI.selectSingleNode(element, "./ds:" + Constants._TAG_RSAKEYVALUE, nscontext);
if (this._rsaKeyElement != null) {
return true;
}
} catch (TransformerException ex) {
}
} else if (isRSAKeyValue) {
// this trick is needed to allow the RetrievalMethodResolver to eat a
// ds:RSAKeyValue directly (without KeyValue)
this._rsaKeyElement = element;
return true;
}
return false;
}