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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.config;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.XMLSecurityConfigurationException;
import org.apache.xml.security.utils.ClassLoaderUtils;
import org.apache.xml.security.utils.I18n;
import org.apache.xml.security.configuration.ConfigurationType;
import org.apache.xml.security.configuration.ObjectFactory;

import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.UnmarshallerHandler;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import java.net.URI;
import java.net.URL;

/**
 * Class to load the algorithms-mappings from a configuration file.
 * After the initialization the mapping is available through the JCEAlgorithmMapper
 *
 */
public class Init {

    private static URI initialized;

    @SuppressWarnings("unchecked")
    public static synchronized void init(URI uri, Class callingClass) throws XMLSecurityException {
        if (initialized == null || uri != null && !uri.equals(initialized)) {
            try {
                JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
                final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
                SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
                schemaFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);
                Schema schema = schemaFactory.newSchema(
                        ClassLoaderUtils.getResource("schemas/security-config.xsd", Init.class));
                unmarshaller.setSchema(schema);
                final UnmarshallerHandler unmarshallerHandler = unmarshaller.getUnmarshallerHandler();

                SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
                saxParserFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);
                saxParserFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
                saxParserFactory.setXIncludeAware(false);
                saxParserFactory.setNamespaceAware(true);
                SAXParser saxParser = saxParserFactory.newSAXParser();
                if (uri == null) {
                    URL resource = ClassLoaderUtils.getResource("security-config.xml", Init.class);
                    if (resource == null) {
                        //kind of chicken-egg problem here
                        I18n.init("en", "US");
                        throw new XMLSecurityConfigurationException("empty", "security-config.xml not found in classpath");
                    }
                    uri = resource.toURI();
                }
                saxParser.parse(uri.toURL().toExternalForm(), new XIncludeHandler(unmarshallerHandler));
                JAXBElement configurationTypeJAXBElement = (JAXBElement) unmarshallerHandler.getResult();

                ConfigurationProperties.init(configurationTypeJAXBElement.getValue().getProperties(), callingClass);
                SecurityHeaderHandlerMapper.init(configurationTypeJAXBElement.getValue().getSecurityHeaderHandlers(), callingClass);
                JCEAlgorithmMapper.init(configurationTypeJAXBElement.getValue().getJCEAlgorithmMappings());
                TransformerAlgorithmMapper.init(configurationTypeJAXBElement.getValue().getTransformAlgorithms(), callingClass);
                ResourceResolverMapper.init(configurationTypeJAXBElement.getValue().getResourceResolvers(), callingClass);

                I18n.init(ConfigurationProperties.getProperty("DefaultLanguageCode"), ConfigurationProperties.getProperty("DefaultCountryCode"));

            } catch (Exception e) {
                //kind of chicken-egg problem here
                I18n.init("en", "US");
                throw new XMLSecurityConfigurationException(e);
            }
            initialized = uri;
        }
    }
}