org.apache.xml.security.keys.keyresolver.implementations.X509SKIResolver 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.Certificate;
import java.security.cert.X509Certificate;
import java.util.Iterator;


import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.x509.XMLX509SKI;
import org.apache.xml.security.keys.keyresolver.KeyResolverException;
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 X509SKIResolver extends KeyResolverSpi {

    private static org.slf4j.Logger log =
        org.slf4j.LoggerFactory.getLogger(X509SKIResolver.class);


    /**
     * Method engineResolvePublicKey
     *
     * @param element
     * @param baseURI
     * @param storage
     * @return null if no {@link PublicKey} could be obtained
     * @throws KeyResolverException
     */
    public PublicKey engineLookupAndResolvePublicKey(
        Element element, String baseURI, StorageResolver storage
    ) throws KeyResolverException {

        X509Certificate cert = 
            this.engineLookupResolveX509Certificate(element, baseURI, storage);

        if (cert != null) {
            return cert.getPublicKey();
        }

        return null;
    }

    /**
     * Method engineResolveX509Certificate
     * @inheritDoc
     * @param element
     * @param baseURI
     * @param storage
     *
     * @throws KeyResolverException
     */
    public X509Certificate engineLookupResolveX509Certificate(
        Element element, String baseURI, StorageResolver storage
    ) throws KeyResolverException {
        if (log.isDebugEnabled()) {
            log.debug("Can I resolve " + element.getTagName() + "?");
        }	      
        if (!XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_X509DATA)) {
            if (log.isDebugEnabled()) {
                log.debug("I can't");
            }
            return null;
        }
        /** Field _x509childObject[] */
        XMLX509SKI x509childObject[] = null;

        Element x509childNodes[] = null;
        x509childNodes = XMLUtils.selectDsNodes(element.getFirstChild(), Constants._TAG_X509SKI);

        if (!(x509childNodes != null && x509childNodes.length > 0)) {
            if (log.isDebugEnabled()) {
                log.debug("I can't");
            }
            return null;
        }
        try {         
            if (storage == null) {
                Object exArgs[] = { Constants._TAG_X509SKI };
                KeyResolverException ex =
                    new KeyResolverException("KeyResolver.needStorageResolver", exArgs);

                if (log.isDebugEnabled()) {
                    log.debug("", ex);
                }

                throw ex;
            }

            x509childObject = new XMLX509SKI[x509childNodes.length];

            for (int i = 0; i < x509childNodes.length; i++) {
                x509childObject[i] = new XMLX509SKI(x509childNodes[i], baseURI);
            }

            Iterator storageIterator = storage.getIterator();
            while (storageIterator.hasNext()) {
                X509Certificate cert = (X509Certificate)storageIterator.next();
                XMLX509SKI certSKI = new XMLX509SKI(element.getOwnerDocument(), cert);

                for (int i = 0; i < x509childObject.length; i++) {
                    if (certSKI.equals(x509childObject[i])) {
                        if (log.isDebugEnabled()) {
                            log.debug("Return PublicKey from " + cert.getSubjectX500Principal().getName());
                        }

                        return cert;
                    }
                }
            }
        } catch (XMLSecurityException ex) {
            throw new KeyResolverException(ex);
        }

        return null;
    }

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