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XMLTooling-J is a low-level library that may be used to construct libraries that allow developers to work with XML in a Java beans manner.
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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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.opensaml.xml.security.keyinfo.provider;

import java.security.KeyException;
import java.security.PublicKey;
import java.util.Collection;

import org.opensaml.xml.XMLObject;
import org.opensaml.xml.security.CriteriaSet;
import org.opensaml.xml.security.SecurityException;
import org.opensaml.xml.security.credential.BasicCredential;
import org.opensaml.xml.security.credential.Credential;
import org.opensaml.xml.security.credential.CredentialContext;
import org.opensaml.xml.security.criteria.KeyAlgorithmCriteria;
import org.opensaml.xml.security.keyinfo.KeyInfoCredentialResolver;
import org.opensaml.xml.security.keyinfo.KeyInfoHelper;
import org.opensaml.xml.security.keyinfo.KeyInfoProvider;
import org.opensaml.xml.security.keyinfo.KeyInfoResolutionContext;
import org.opensaml.xml.signature.KeyValue;
import org.opensaml.xml.signature.RSAKeyValue;
import org.opensaml.xml.util.LazySet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Implementation of {@link KeyInfoProvider} which supports {@link RSAKeyValue}.
 */
public class RSAKeyValueProvider extends AbstractKeyInfoProvider {

    /** Class logger. */
    private final Logger log = LoggerFactory.getLogger(RSAKeyValueProvider.class);

    /** {@inheritDoc} */
    public boolean handles(XMLObject keyInfoChild) {
        return getRSAKeyValue(keyInfoChild) != null;
    }

    /** {@inheritDoc} */
    public Collection process(KeyInfoCredentialResolver resolver, XMLObject keyInfoChild,
            CriteriaSet criteriaSet, KeyInfoResolutionContext kiContext) throws SecurityException {

        RSAKeyValue keyValue = getRSAKeyValue(keyInfoChild);
        if (keyValue == null) {
            return null;
        }

        KeyAlgorithmCriteria algorithmCriteria = criteriaSet.get(KeyAlgorithmCriteria.class);
        if (algorithmCriteria != null && algorithmCriteria.getKeyAlgorithm() != null
                && !algorithmCriteria.getKeyAlgorithm().equals("RSA")) {
            log.debug("Criteria specified non-RSA key algorithm, skipping");
            return null;
        }

        log.debug("Attempting to extract credential from an RSAKeyValue");

        PublicKey pubKey = null;
        try {
            pubKey = KeyInfoHelper.getRSAKey(keyValue);
        } catch (KeyException e) {
            log.error("Error extracting RSA key value", e);
            throw new SecurityException("Error extracting RSA key value", e);
        }
        BasicCredential cred = new BasicCredential();
        cred.setPublicKey(pubKey);
        if (kiContext != null) {
            cred.getKeyNames().addAll(kiContext.getKeyNames());
        }

        CredentialContext credContext = buildCredentialContext(kiContext);
        if (credContext != null) {
            cred.getCredentalContextSet().add(credContext);
        }

        log.debug("Credential successfully extracted from RSAKeyValue");
        LazySet credentialSet = new LazySet();
        credentialSet.add(cred);
        return credentialSet;
    }

    /**
     * Get the RSAKeyValue from the passed XML object.
     * 
     * @param xmlObject an XML object, presumably either a {@link KeyValue} or an {@link RSAKeyValue}
     * @return the RSAKeyValue which was found, or null if none
     */
    protected RSAKeyValue getRSAKeyValue(XMLObject xmlObject) {
        if (xmlObject == null) {
            return null;
        }

        if (xmlObject instanceof RSAKeyValue) {
            return (RSAKeyValue) xmlObject;
        }

        if (xmlObject instanceof KeyValue) {
            return ((KeyValue) xmlObject).getRSAKeyValue();
        }
        return null;
    }
}