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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.content;

import java.security.PublicKey;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.keyvalues.DSAKeyValue;
import org.apache.xml.security.keys.content.keyvalues.ECKeyValue;
import org.apache.xml.security.keys.content.keyvalues.RSAKeyValue;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.SignatureElementProxy;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * The KeyValue element contains a single public key that may be useful in
 * validating the signature. Structured formats for defining DSA (REQUIRED)
 * and RSA (RECOMMENDED) public keys are defined in Signature Algorithms
 * (section 6.4). The KeyValue element may include externally defined public
 * keys values represented as PCDATA or element types from an external
 * namespace.
 */
public class KeyValue extends SignatureElementProxy implements KeyInfoContent {

    /**
     * Constructor KeyValue
     *
     * @param doc
     * @param dsaKeyValue
     */
    public KeyValue(Document doc, DSAKeyValue dsaKeyValue) {
        super(doc);

        addReturnToSelf();
        appendSelf(dsaKeyValue);
        addReturnToSelf();
    }

    /**
     * Constructor KeyValue
     *
     * @param doc
     * @param rsaKeyValue
     */
    public KeyValue(Document doc, RSAKeyValue rsaKeyValue) {
        super(doc);

        addReturnToSelf();
        appendSelf(rsaKeyValue);
        addReturnToSelf();
    }

    /**
     * Constructor KeyValue
     *
     * @param doc
     * @param unknownKeyValue
     */
    public KeyValue(Document doc, Element unknownKeyValue) {
        super(doc);

        addReturnToSelf();
        appendSelf(unknownKeyValue);
        addReturnToSelf();
    }

    /**
     * Constructor KeyValue
     *
     * @param doc
     * @param pk
     */
    public KeyValue(Document doc, PublicKey pk) {
        super(doc);

        addReturnToSelf();

        if (pk instanceof java.security.interfaces.DSAPublicKey) {
            DSAKeyValue dsa = new DSAKeyValue(getDocument(), pk);

            appendSelf(dsa);
            addReturnToSelf();
        } else if (pk instanceof java.security.interfaces.RSAPublicKey) {
            RSAKeyValue rsa = new RSAKeyValue(getDocument(), pk);

            appendSelf(rsa);
            addReturnToSelf();
        } else if (pk instanceof java.security.interfaces.ECPublicKey) {
            ECKeyValue ec = new ECKeyValue(getDocument(), pk);

            appendSelf(ec);
            addReturnToSelf();
        } else {
            String error = "The given PublicKey type " + pk + " is not supported. Only DSAPublicKey and "
                + "RSAPublicKey and ECPublicKey types are currently supported";
            throw new IllegalArgumentException(error);
        }
    }

    /**
     * Verifies that the XML KeyValue encoding is supported for the given key type. If the
     * encoding is supported, it returns true else false.
     *
     * @return true if the public key has a KeyValue encoding, false otherwise.
     */
    public static boolean isSupportedKeyType(PublicKey publicKey) {

        return publicKey instanceof java.security.interfaces.DSAPublicKey
                || publicKey instanceof java.security.interfaces.RSAPublicKey
                || publicKey instanceof java.security.interfaces.ECPublicKey;

    }

    /**
     * Constructor KeyValue
     *
     * @param element
     * @param baseURI
     * @throws XMLSecurityException
     */
    public KeyValue(Element element, String baseURI) throws XMLSecurityException {
        super(element, baseURI);
    }

    /**
     * Method getPublicKey
     *
     * @return the public key
     * @throws XMLSecurityException
     */
    public PublicKey getPublicKey() throws XMLSecurityException {
        Element rsa =
            XMLUtils.selectDsNode(
                getFirstChild(), Constants._TAG_RSAKEYVALUE, 0);

        if (rsa != null) {
            RSAKeyValue kv = new RSAKeyValue(rsa, this.baseURI);
            return kv.getPublicKey();
        }

        Element dsa =
            XMLUtils.selectDsNode(
                getFirstChild(), Constants._TAG_DSAKEYVALUE, 0);

        if (dsa != null) {
            DSAKeyValue kv = new DSAKeyValue(dsa, this.baseURI);
            return kv.getPublicKey();
        }

        return null;
    }

    /** {@inheritDoc} */
    @Override
    public String getBaseLocalName() {
        return Constants._TAG_KEYVALUE;
    }
}