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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.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.Signature11ElementProxy;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * Provides content model support for the dsig11:DEREncodedKeyvalue element.
 *
 */
public class DEREncodedKeyValue extends Signature11ElementProxy implements KeyInfoContent {

    /** JCA algorithm key types supported by this implementation. */
    private static final String[] supportedKeyTypes = { "RSA", "DSA", "EC",
            "DiffieHellman", "DH", "XDH", "X25519", "X448",
            "EdDSA", "Ed25519", "Ed448",
            "RSASSA-PSS"};

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

    /**
     * Constructor DEREncodedKeyValue
     *
     * @param doc
     * @param publicKey
     * @throws XMLSecurityException
     */
    public DEREncodedKeyValue(Document doc, PublicKey publicKey) throws XMLSecurityException {
        super(doc);

        this.addBase64Text(getEncodedDER(publicKey));
    }

    /**
     * Constructor DEREncodedKeyValue
     *
     * @param doc
     * @param encodedKey
     */
    public DEREncodedKeyValue(Document doc, byte[] encodedKey) {
        super(doc);

        this.addBase64Text(encodedKey);
    }

    /**
     * Sets the Id attribute
     *
     * @param id ID
     */
    public void setId(String id) {
        setLocalIdAttribute(Constants._ATT_ID, id);
    }

    /**
     * Returns the Id attribute
     *
     * @return the Id attribute
     */
    public String getId() {
        return getLocalAttribute(Constants._ATT_ID);
    }

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

    /**
     * Method getPublicKey
     *
     * @return the public key
     * @throws XMLSecurityException
     */
    public PublicKey getPublicKey() throws XMLSecurityException {
        byte[] encodedKey = getBytesFromTextChild();

        // Iterate over the supported key types until one produces a public key.
        for (String keyType : supportedKeyTypes) {
            try {
                KeyFactory keyFactory = KeyFactory.getInstance(keyType);
                X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey);
                PublicKey publicKey = keyFactory.generatePublic(keySpec);
                if (publicKey != null) {
                    return publicKey;
                }
            } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { //NOPMD
                // Do nothing, try the next type
            }
        }
        throw new XMLSecurityException("DEREncodedKeyValue.UnsupportedEncodedKey");
    }

    /**
     * Method getEncodedDER
     *
     * @return the public key
     * @throws XMLSecurityException
     */
    protected byte[] getEncodedDER(PublicKey publicKey) throws XMLSecurityException {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance(publicKey.getAlgorithm());
            X509EncodedKeySpec keySpec = keyFactory.getKeySpec(publicKey, X509EncodedKeySpec.class);
            return keySpec.getEncoded();
        } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
            Object[] exArgs = { publicKey.getAlgorithm(), publicKey.getFormat(), publicKey.getClass().getName() };
            throw new XMLSecurityException(e, "DEREncodedKeyValue.UnsupportedPublicKey", exArgs);
        }
    }
}