org.apache.xml.security.keys.keyresolver.implementations.RSAKeyValueResolver Maven / Gradle / Ivy

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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.xml.security.keys.keyresolver.implementations;

import java.security.PublicKey;
import java.security.cert.X509Certificate;


import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.keyvalues.RSAKeyValue;
import org.apache.xml.security.keys.keyresolver.KeyResolverSpi;
import org.apache.xml.security.keys.storage.StorageResolver;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Element;

public class RSAKeyValueResolver extends KeyResolverSpi {

    private static org.slf4j.Logger log =
        org.slf4j.LoggerFactory.getLogger(RSAKeyValueResolver.class);


    /** @inheritDoc */
    public PublicKey engineLookupAndResolvePublicKey(
        Element element, String baseURI, StorageResolver storage
    ) {
        if (log.isDebugEnabled()) {
            log.debug("Can I resolve " + element.getTagName());
        }
        if (element == null) {
            return null;
        }

        boolean isKeyValue = XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYVALUE);
        Element rsaKeyElement = null;
        if (isKeyValue) {                  
            rsaKeyElement = 
                XMLUtils.selectDsNode(element.getFirstChild(), Constants._TAG_RSAKEYVALUE, 0);
        } else if (XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_RSAKEYVALUE)) {
            // this trick is needed to allow the RetrievalMethodResolver to eat a
            // ds:RSAKeyValue directly (without KeyValue)
            rsaKeyElement = element;		  
        }

        if (rsaKeyElement == null) {
            return null;         
        }

        try {
            RSAKeyValue rsaKeyValue = new RSAKeyValue(rsaKeyElement, baseURI);

            return rsaKeyValue.getPublicKey();
        } catch (XMLSecurityException ex) {
            if (log.isDebugEnabled()) {
                log.debug("XMLSecurityException", ex);
            }
        }

        return null;
    }

    /** @inheritDoc */
    public X509Certificate engineLookupResolveX509Certificate(
        Element element, String baseURI, StorageResolver storage
    ) {
        return null;
    }

    /** @inheritDoc */
    public javax.crypto.SecretKey engineLookupAndResolveSecretKey(
        Element element, String baseURI, StorageResolver storage
    ) {
        return null;
    }
}