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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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 * http://www.apache.org/licenses/LICENSE-2.0
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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.RSAKeyValue;
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;

public class RSAKeyValueResolver extends KeyResolverSpi {

    /** {@link org.apache.commons.logging} logging facility */
    private static java.util.logging.Logger log =
        java.util.logging.Logger.getLogger(RSAKeyValueResolver.class.getName());


    /** @inheritDoc */
    public PublicKey engineLookupAndResolvePublicKey(
        Element element, String BaseURI, StorageResolver storage
    ) {
        if (log.isLoggable(java.util.logging.Level.FINE)) {
            log.log(java.util.logging.Level.FINE, "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.isLoggable(java.util.logging.Level.FINE)) {
                log.log(java.util.logging.Level.FINE, "XMLSecurityException", ex);
            }
        }

        return null;
    }

    /** @inheritDoc */

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