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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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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.poi.poifs.crypt.dsig;

import static org.apache.poi.ooxml.POIXMLTypeLoader.DEFAULT_XML_OPTIONS;
import static org.apache.poi.poifs.crypt.dsig.facets.SignatureFacet.MS_DIGSIG_NS;
import static org.apache.poi.poifs.crypt.dsig.facets.SignatureFacet.XML_DIGSIG_NS;

import java.io.IOException;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

import javax.xml.crypto.MarshalException;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.crypto.dsig.XMLSignatureException;
import javax.xml.crypto.dsig.XMLSignatureFactory;
import javax.xml.crypto.dsig.dom.DOMValidateContext;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.ooxml.util.DocumentHelper;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.xmlbeans.XmlException;
import org.w3.x2000.x09.xmldsig.SignatureDocument;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class SignaturePart {
    private static final POILogger LOG = POILogFactory.getLogger(SignaturePart.class);
    private static final String XMLSEC_VALIDATE_MANIFEST = "org.jcp.xml.dsig.validateManifests"; 

    
    private final PackagePart signaturePart;
    private final SignatureConfig signatureConfig;
    private X509Certificate signer;
    private List certChain;
    
    /* package */ SignaturePart(final PackagePart signaturePart, final SignatureConfig signatureConfig) {
        this.signaturePart = signaturePart;
        this.signatureConfig = signatureConfig;
    }
    
    /**
     * @return the package part containing the signature
     */
    public PackagePart getPackagePart() {
        return signaturePart;
    }
    
    /**
     * @return the signer certificate
     */
    public X509Certificate getSigner() {
        return signer;
    }
    
    /**
     * @return the certificate chain of the signer
     */
    public List getCertChain() {
        return certChain;
    }
    
    /**
     * Helper method for examining the xml signature
     *
     * @return the xml signature document
     * @throws IOException if the xml signature doesn't exist or can't be read
     * @throws XmlException if the xml signature is malformed
     */
    public SignatureDocument getSignatureDocument() throws IOException, XmlException {
        // TODO: check for XXE
        return SignatureDocument.Factory.parse(signaturePart.getInputStream(), DEFAULT_XML_OPTIONS);
    }

    /**
     * @return true, when the xml signature is valid, false otherwise
     * 
     * @throws EncryptedDocumentException if the signature can't be extracted or if its malformed
     */
    public boolean validate() {
        KeyInfoKeySelector keySelector = new KeyInfoKeySelector();
        XPath xpath = XPathFactory.newInstance().newXPath();
        xpath.setNamespaceContext(new XPathNSContext());

        try {
            Document doc = DocumentHelper.readDocument(signaturePart.getInputStream());
            NodeList nl = (NodeList)xpath.compile("//*[@Id]").evaluate(doc, XPathConstants.NODESET);
            final int length = nl.getLength();
            for (int i=0; i> m = new HashMap();
        m.put("//mdssi:SignatureTime/mdssi:Value", signatureConfig::setExecutionTime);
        m.put("//xd:ClaimedRole", signatureConfig::setXadesRole);
        m.put("//dsss:SignatureComments", signatureConfig::setSignatureDescription);
        m.put("//xd:QualifyingProperties//xd:SignedSignatureProperties//ds:DigestMethod/@Algorithm", signatureConfig::setXadesDigestAlgo);
        m.put("//ds:CanonicalizationMethod", signatureConfig::setCanonicalizationMethod);

        for (Map.Entry> me : m.entrySet()) {
            String val = (String)xpath.compile(me.getKey()).evaluate(doc, XPathConstants.STRING);
            me.getValue().accept(val);
        }
    }

    private class XPathNSContext implements NamespaceContext {
        final Map nsMap = new HashMap<>();

        {
            signatureConfig.getNamespacePrefixes().forEach((k,v) -> nsMap.put(v,k));
            nsMap.put("dsss", MS_DIGSIG_NS);
            nsMap.put("ds", XML_DIGSIG_NS);
        }

        public String getNamespaceURI(String prefix) {
            return nsMap.get(prefix);
        }
        public Iterator getPrefixes(String val) {
            return null;
        }
        public String getPrefix(String uri) {
            return null;
        }
    }
}