Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 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 com.itextpdf.text.pdf.PdfDictionary; import com.itextpdf.text.pdf.PdfName; import java.io.InputStream; import java.security.GeneralSecurityException; /** * Produces a blank (or empty) signature. Useful for deferred signing with * MakeSignature.signExternalContainer(). * @author Paulo Soares */ public class ExternalBlankSignatureContainer implements ExternalSignatureContainer { private PdfDictionary sigDic; public ExternalBlankSignatureContainer(PdfDictionary sigDic) { this.sigDic = sigDic; } public ExternalBlankSignatureContainer(PdfName filter, PdfName subFilter) { sigDic = new PdfDictionary(); sigDic.put(PdfName.FILTER, filter); sigDic.put(PdfName.SUBFILTER, subFilter); } public byte[] sign(InputStream data) throws GeneralSecurityException { return new byte[0]; } public void modifySigningDictionary(PdfDictionary signDic) { signDic.putAll(sigDic); } }