001/* 002 * $Id: TSAClient.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf; 045 046/** 047 * Time Stamp Authority client (caller) interface. 048 * <p> 049 * Interface used by the PdfPKCS7 digital signature builder to call 050 * Time Stamp Authority providing RFC 3161 compliant time stamp token. 051 * @author Martin Brunecky, 07/17/2007 052 * @since 2.1.6 053 */ 054public interface TSAClient { 055 /** 056 * Get the time stamp token size estimate. 057 * Implementation must return value large enough to accomodate the entire token 058 * returned by getTimeStampToken() _prior_ to actual getTimeStampToken() call. 059 * @return an estimate of the token size 060 */ 061 public int getTokenSizeEstimate(); 062 063 /** 064 * Get RFC 3161 timeStampToken. 065 * Method may return null indicating that timestamp should be skipped. 066 * @param caller PdfPKCS7 - calling PdfPKCS7 instance (in case caller needs it) 067 * @param imprint byte[] - data imprint to be time-stamped 068 * @return byte[] - encoded, TSA signed data of the timeStampToken 069 * @throws Exception - TSA request failed 070 */ 071 public byte[] getTimeStampToken(PdfPKCS7 caller, byte[] imprint) throws Exception; 072 073}