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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.signature;

import org.apache.xml.security.exceptions.XMLSecurityException;
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.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * Handles <ds:SignatureProperties> elements
 * This Element holds {@link SignatureProperty} properties that contain additional information items
 * concerning the generation of the signature.
 * for example, data-time stamp, serial number of cryptographic hardware.
 *
 */
public class SignatureProperties extends SignatureElementProxy {

    /**
     * Constructor SignatureProperties
     *
     * @param doc
     */
    public SignatureProperties(Document doc) {
        super(doc);

        addReturnToSelf();
    }

    /**
     * Constructs {@link SignatureProperties} from {@link Element}
     * @param element SignatureProperties element
     * @param baseURI the URI of the resource where the XML instance was stored
     * @throws XMLSecurityException
     */
    public SignatureProperties(Element element, String baseURI) throws XMLSecurityException {
        super(element, baseURI);

        Attr attr = element.getAttributeNodeNS(null, "Id");
        if (attr != null) {
            element.setIdAttributeNode(attr, true);
        }

        Element[] propertyElems =
                XMLUtils.selectDsNodes(getFirstChild(), Constants._TAG_SIGNATUREPROPERTY);
        for (Element propertyElem : propertyElems) {
            Attr propertyAttr = propertyElem.getAttributeNodeNS(null, "Id");
            if (propertyAttr != null) {
                propertyElem.setIdAttributeNode(propertyAttr, true);
            }
        }
    }

    /**
     * Return the nonnegative number of added SignatureProperty elements.
     *
     * @return the number of SignatureProperty elements
     */
    public int getLength() {
        Element[] propertyElems =
            XMLUtils.selectDsNodes(getFirstChild(), Constants._TAG_SIGNATUREPROPERTY);

        return propertyElems.length;
    }

    /**
     * Return the i^th SignatureProperty. Valid i
     * values are 0 to {link@ getSize}-1.
     *
     * @param i Index of the requested {@link SignatureProperty}
     * @return the i^th SignatureProperty
     * @throws XMLSignatureException
     */
    public SignatureProperty item(int i) throws XMLSignatureException {
        try {
            Element propertyElem =
                XMLUtils.selectDsNode(getFirstChild(), Constants._TAG_SIGNATUREPROPERTY, i);

            if (propertyElem == null) {
                return null;
            }
            return new SignatureProperty(propertyElem, this.baseURI);
        } catch (XMLSecurityException ex) {
            throw new XMLSignatureException(ex);
        }
    }

    /**
     * Sets the Id attribute
     *
     * @param Id the Id attribute
     */
    public void setId(String Id) {
        if (Id != null) {
            setLocalIdAttribute(Constants._ATT_ID, Id);
        }
    }

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

    /**
     * Method addSignatureProperty
     *
     * @param sp
     */
    public void addSignatureProperty(SignatureProperty sp) {
        appendSelf(sp);
        addReturnToSelf();
    }

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