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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.stax.ext;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.PublicKey;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPublicKey;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.XMLConstants;
import jakarta.xml.bind.JAXBElement;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.SAXException;

import org.apache.xml.security.algorithms.JCEMapper;
import org.apache.xml.security.algorithms.implementations.ECDSAUtils;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.x509.XMLX509SKI;
import org.apache.xml.security.stax.config.TransformerAlgorithmMapper;
import org.apache.xml.security.stax.ext.stax.XMLSecAttribute;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.ext.stax.XMLSecNamespace;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;
import org.apache.xml.security.stax.impl.util.ConcreteLSInput;
import org.apache.xml.security.stax.securityEvent.DefaultTokenSecurityEvent;
import org.apache.xml.security.stax.securityEvent.EncryptedKeyTokenSecurityEvent;
import org.apache.xml.security.stax.securityEvent.KeyNameTokenSecurityEvent;
import org.apache.xml.security.stax.securityEvent.KeyValueTokenSecurityEvent;
import org.apache.xml.security.stax.securityEvent.TokenSecurityEvent;
import org.apache.xml.security.stax.securityEvent.X509TokenSecurityEvent;
import org.apache.xml.security.stax.securityToken.InboundSecurityToken;
import org.apache.xml.security.stax.securityToken.SecurityTokenConstants;
import org.apache.xml.security.utils.ClassLoaderUtils;
import org.apache.xml.security.utils.JavaUtils;
import org.apache.xml.security.utils.XMLUtils;

/**
 */
public class XMLSecurityUtils {

    private static final int MAX_SYMMETRIC_KEY_SIZE = 1024;

    protected XMLSecurityUtils() {
    }

    /**
     * Returns the Id reference without the leading #
     *
     * @param reference The reference on which to drop the #
     * @return The reference without a leading #
     */
    public static String dropReferenceMarker(String reference) {
        if (reference != null && reference.length() > 0 && reference.charAt(0) == '#') {
            return reference.substring(1);
        }
        return reference;
    }

    /**
     * Returns the XMLEvent type in String form
     *
     * @param xmlSecEvent
     * @return The XMLEvent type as string representation
     */
    public static String getXMLEventAsString(XMLSecEvent xmlSecEvent) {
        int eventType = xmlSecEvent.getEventType();

        switch (eventType) {
            case XMLSecEvent.START_ELEMENT:
                return "START_ELEMENT";
            case XMLSecEvent.END_ELEMENT:
                return "END_ELEMENT";
            case XMLSecEvent.PROCESSING_INSTRUCTION:
                return "PROCESSING_INSTRUCTION";
            case XMLSecEvent.CHARACTERS:
                return "CHARACTERS";
            case XMLSecEvent.COMMENT:
                return "COMMENT";
            case XMLSecEvent.START_DOCUMENT:
                return "START_DOCUMENT";
            case XMLSecEvent.END_DOCUMENT:
                return "END_DOCUMENT";
            case XMLSecEvent.ATTRIBUTE:
                return "ATTRIBUTE";
            case XMLSecEvent.DTD:
                return "DTD";
            case XMLSecEvent.NAMESPACE:
                return "NAMESPACE";
            default:
                throw new IllegalArgumentException("Illegal XMLSecEvent received: " + eventType);
        }
    }

    public static Transformer getTransformer(
            Transformer transformer, OutputStream outputStream, Map properties, String algorithm,
            XMLSecurityConstants.DIRECTION direction) throws XMLSecurityException {

        @SuppressWarnings("unchecked")
        Class transformerClass = (Class) TransformerAlgorithmMapper.getTransformerClass(algorithm, direction);
        Transformer childTransformer = null;

        try {
            childTransformer = JavaUtils.newInstanceWithEmptyConstructor(transformerClass);
            if (properties != null) {
                childTransformer.setProperties(properties);
            }
            if (outputStream != null) {
                childTransformer.setOutputStream(outputStream);
            } else {
                childTransformer.setTransformer(transformer);
            }
        } catch (InstantiationException | IllegalAccessException e) {
            throw new XMLSecurityException(e);
        }
        return childTransformer;
    }

    @SuppressWarnings("unchecked")
    public static  T getQNameType(List