itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

⏎ com/itextpdf/text/pdf/security/CrlClientOnline.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.security;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.log.Logger;
import com.itextpdf.text.log.LoggerFactory;

/**
 * An implementation of the CrlClient that fetches the CRL bytes
 * from an URL.
 * @author Paulo Soares
 */
public class CrlClientOnline implements CrlClient {

	/** The Logger instance. */
    private static final Logger LOGGER = LoggerFactory.getLogger(CrlClientOnline.class);
    
    /** The URLs of the CRLs. */
    protected List<URL> urls = new ArrayList<URL>();

    /**
     * Creates a CrlClientOnline instance that will try to find
     * a single CRL by walking through the certificate chain.
     */
    public CrlClientOnline() {
    }
    
    /**
     * Creates a CrlClientOnline instance using one or more URLs.
     */
    public CrlClientOnline(String... crls) {
    	for (String url : crls) {
    		addUrl(url);
    	}
    }
    
    /**
     * Creates a CrlClientOnline instance using one or more URLs.
     */
    public CrlClientOnline(URL... crls) {
    	for (URL url : urls) {
    		addUrl(url);
    	}
    }
    
    /**
     * Creates a CrlClientOnline instance using a certificate chain.
     */
    public CrlClientOnline(Certificate[] chain) {
        for (int i = 0; i < chain.length; i++) {
        	X509Certificate cert = (X509Certificate)chain[i];
            LOGGER.info("Checking certificate: " + cert.getSubjectDN());
        	try {
				addUrl(CertificateUtil.getCRLURL(cert));
			} catch (CertificateParsingException e) {
	            LOGGER.info("Skipped CRL url (certificate could not be parsed)");
			}
        }
    }
    
    /**
     * Adds an URL to the list of CRL URLs
     * @param url	an URL in the form of a String
     */
    protected void addUrl(String url) {
    	try {
			addUrl(new URL(url));
		} catch (MalformedURLException e) {
            LOGGER.info("Skipped CRL url (malformed): " + url);
		}
    }

    /**
     * Adds an URL to the list of CRL URLs
     * @param url	an URL object
     */
    protected void addUrl(URL url) {
    	if (urls.contains(url)) {
            LOGGER.info("Skipped CRL url (duplicate): " + url);
    		return;
    	}
    	urls.add(url);
        LOGGER.info("Added CRL url: " + url);
    }
    
    /**
     * Fetches the CRL bytes from an URL.
     * If no url is passed as parameter, the url will be obtained from the certificate.
     * If you want to load a CRL from a local file, subclass this method and pass an
     * URL with the path to the local file to this method. An other option is to use
     * the CrlClientOffline class.
     * @see com.itextpdf.text.pdf.security.CrlClient#getEncoded(java.security.cert.X509Certificate, java.lang.String)
     */
    public Collection<byte[]> getEncoded(X509Certificate checkCert, String url) {
        if (checkCert == null)
            return null;
        List<URL> urllist = new ArrayList<URL>(urls);
        if (urllist.size() == 0) {
        	LOGGER.info("Looking for CRL for certificate " + checkCert.getSubjectDN());
        	try {
        		if (url == null)
        			url = CertificateUtil.getCRLURL(checkCert);
        		if (url == null)
        			throw new NullPointerException();
        		urllist.add(new URL(url));
        		LOGGER.info("Found CRL url: " + url);
        	}
        	catch (Exception e) {
        		LOGGER.info("Skipped CRL url: " + e.getMessage());
        	}
        }
        ArrayList<byte[]> ar = new ArrayList<byte[]>();
        for (URL urlt : urllist) {
        	try {
        		LOGGER.info("Checking CRL: " + urlt);
        		HttpURLConnection con = (HttpURLConnection)urlt.openConnection();
        		if (con.getResponseCode() / 100 != 2) {
        			throw new IOException(MessageLocalization.getComposedMessage("invalid.http.response.1", con.getResponseCode()));
        		}
        		//Get Response
        		InputStream inp = (InputStream) con.getContent();
        		byte[] buf = new byte[1024];
        		ByteArrayOutputStream bout = new ByteArrayOutputStream();
        		while (true) {
        			int n = inp.read(buf, 0, buf.length);
        			if (n <= 0)
        				break;
        			bout.write(buf, 0, n);
        		}
        		inp.close();
        		ar.add(bout.toByteArray());
        		LOGGER.info("Added CRL found at: " + urlt);
        	}
        	catch (Exception e) {
        		LOGGER.info("Skipped CRL: " + e.getMessage() + " for " + urlt);
        	}
        }
        return ar;
    }
}

⏎ com/itextpdf/text/pdf/security/CrlClientOnline.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
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⇒ iText-2.1.6.jar - iText, a JAVA-PDF library

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