/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
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* distribution.
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* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "<WebSig>" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Institute for
* Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
* The development of this software was partly funded by the European
* Commission in the <WebSig> project in the ISIS Programme.
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package org.apache.xml.security.keys.keyresolver.implementations;
import java.security.*;
import java.security.cert.*;
import java.security.spec.*;
import javax.xml.transform.TransformerException;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.keyvalues.DSAKeyValue;
import org.apache.xml.security.keys.keyresolver.*;
import org.apache.xml.security.keys.storage.*;
import org.apache.xml.security.signature.XMLSignatureException;
import org.apache.xml.security.utils.*;
import org.apache.xpath.XPathAPI;
import org.w3c.dom.*;
/**
*
* @author $Author: vdkoogh $
*/
public class DSAKeyValueResolver extends KeyResolverSpi {
/** Field _dsaKeyElement */
private Element _dsaKeyElement = null;
/**
* Method engineCanResolve
*
* @param element
* @param BaseURI
* @param storage
*
*/
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) {
try {
Element nscontext = XMLUtils.createDSctx(element.getOwnerDocument(),
"ds",
Constants.SignatureSpecNS);
this._dsaKeyElement = (Element) XPathAPI.selectSingleNode(element,
"./ds:" + Constants._TAG_DSAKEYVALUE, nscontext);
if (this._dsaKeyElement != null) {
return true;
}
} catch (TransformerException ex) {}
} 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
* @throws KeyResolverException
*/
public PublicKey engineResolvePublicKey(
Element element, String BaseURI, StorageResolver storage)
throws KeyResolverException {
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) {
;
}
return null;
}
/**
* Method engineResolveX509Certificate
*
* @param element
* @param BaseURI
* @param storage
*
* @throws KeyResolverException
*/
public X509Certificate engineResolveX509Certificate(
Element element, String BaseURI, StorageResolver storage)
throws KeyResolverException {
return null;
}
/**
* Method engineResolveSecretKey
*
* @param element
* @param BaseURI
* @param storage
*
* @throws KeyResolverException
*/
public javax.crypto.SecretKey engineResolveSecretKey(
Element element, String BaseURI, StorageResolver storage)
throws KeyResolverException {
return null;
}
}