/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.keys.content.keyvalues.DSAKeyValue;
import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi;
import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Element;
/**
*
* @author $Author: raul $
*/
public class DSAKeyValueResolver extends KeyResolverSpi {
/** Field _dsaKeyElement */
private Element _dsaKeyElement = null;
/** @inheritDoc */
public boolean engineCanResolve(Element element, String BaseURI,
StorageResolver storage) {
if (element == null) {
return false;
}
boolean isKeyValue = XMLUtils.elementIsInSignatureSpace(element,
Constants._TAG_KEYVALUE);
boolean isDSAKeyValue = XMLUtils.elementIsInSignatureSpace(element,
Constants._TAG_DSAKEYVALUE);
if (isKeyValue) {
this._dsaKeyElement =
XMLUtils.selectDsNode(element.getFirstChild(),Constants._TAG_DSAKEYVALUE,0);
if (this._dsaKeyElement != null) {
return true;
}
} else if (isDSAKeyValue) {
// this trick is needed to allow the RetrievalMethodResolver to eat a
// ds:DSAKeyValue directly (without KeyValue)
this._dsaKeyElement = element;
return true;
}
return false;
}
/**
* Method engineResolvePublicKey
*
* @param element
* @param BaseURI
* @param storage
* @return null if no {@link PublicKey} could be obtained
*/
public PublicKey engineResolvePublicKey(
Element element, String BaseURI, StorageResolver storage) {
if (this._dsaKeyElement == null) {
boolean weCanResolve = this.engineCanResolve(element, BaseURI,
storage);
if (!weCanResolve || (this._dsaKeyElement == null)) {
return null;
}
}
try {
DSAKeyValue dsaKeyValue = new DSAKeyValue(this._dsaKeyElement,
BaseURI);
PublicKey pk = dsaKeyValue.getPublicKey();
return pk;
} catch (XMLSecurityException ex) {
//do nothing
}
return null;
}
/** @inheritDoc */
public X509Certificate engineResolveX509Certificate(
Element element, String BaseURI, StorageResolver storage) {
return null;
}
/** @inheritDoc */
public javax.crypto.SecretKey engineResolveSecretKey(
Element element, String BaseURI, StorageResolver storage){
return null;
}
}