Java tutorial
/* * $Id: TSAClientBouncyCastle.java 4113 2009-12-01 11:08:59Z blowagie $ * * This file is part of the iText project. * Copyright (c) 1998-2009 1T3XT BVBA * 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 1T3XT, * 1T3XT 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, * you 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; import java.io.*; import java.math.*; import java.net.*; import com.itextpdf.text.error_messages.MessageLocalization; import org.bouncycastle.asn1.cmp.*; import org.bouncycastle.asn1.x509.*; import org.bouncycastle.tsp.*; import com.itextpdf.text.pdf.codec.Base64; /** * Time Stamp Authority Client interface implementation using Bouncy Castle * org.bouncycastle.tsp package. * <p> * Created by Aiken Sam, 2006-11-15, refactored by Martin Brunecky, 07/15/2007 * for ease of subclassing. * </p> * @since 2.1.6 */ public class TSAClientBouncyCastle implements TSAClient { /** URL of the Time Stamp Authority */ protected String tsaURL; /** TSA Username */ protected String tsaUsername; /** TSA password */ protected String tsaPassword; /** Estimate of the received time stamp token */ protected int tokSzEstimate; /** * Creates an instance of a TSAClient that will use BouncyCastle. * @param url String - Time Stamp Authority URL (i.e. "http://tsatest1.digistamp.com/TSA") */ public TSAClientBouncyCastle(String url) { this(url, null, null, 4096); } /** * Creates an instance of a TSAClient that will use BouncyCastle. * @param url String - Time Stamp Authority URL (i.e. "http://tsatest1.digistamp.com/TSA") * @param username String - user(account) name * @param password String - password */ public TSAClientBouncyCastle(String url, String username, String password) { this(url, username, password, 4096); } /** * Constructor. * Note the token size estimate is updated by each call, as the token * size is not likely to change (as long as we call the same TSA using * the same imprint length). * @param url String - Time Stamp Authority URL (i.e. "http://tsatest1.digistamp.com/TSA") * @param username String - user(account) name * @param password String - password * @param tokSzEstimate int - estimated size of received time stamp token (DER encoded) */ public TSAClientBouncyCastle(String url, String username, String password, int tokSzEstimate) { this.tsaURL = url; this.tsaUsername = username; this.tsaPassword = password; this.tokSzEstimate = tokSzEstimate; } /** * Get the token size estimate. * Returned value reflects the result of the last succesfull call, padded * @return an estimate of the token size */ public int getTokenSizeEstimate() { return tokSzEstimate; } /** * Get RFC 3161 timeStampToken. * Method may return null indicating that timestamp should be skipped. * @param caller PdfPKCS7 - calling PdfPKCS7 instance (in case caller needs it) * @param imprint byte[] - data imprint to be time-stamped * @return byte[] - encoded, TSA signed data of the timeStampToken * @throws Exception - TSA request failed * @see com.itextpdf.text.pdf.TSAClient#getTimeStampToken(com.itextpdf.text.pdf.PdfPKCS7, byte[]) */ public byte[] getTimeStampToken(PdfPKCS7 caller, byte[] imprint) throws Exception { return getTimeStampToken(imprint); } /** * Get timestamp token - Bouncy Castle request encoding / decoding layer */ protected byte[] getTimeStampToken(byte[] imprint) throws Exception { byte[] respBytes = null; try { // Setup the time stamp request TimeStampRequestGenerator tsqGenerator = new TimeStampRequestGenerator(); tsqGenerator.setCertReq(true); // tsqGenerator.setReqPolicy("1.3.6.1.4.1.601.10.3.1"); BigInteger nonce = BigInteger.valueOf(System.currentTimeMillis()); TimeStampRequest request = tsqGenerator.generate(X509ObjectIdentifiers.id_SHA1.getId(), imprint, nonce); byte[] requestBytes = request.getEncoded(); // Call the communications layer respBytes = getTSAResponse(requestBytes); // Handle the TSA response TimeStampResponse response = new TimeStampResponse(respBytes); // validate communication level attributes (RFC 3161 PKIStatus) response.validate(request); PKIFailureInfo failure = response.getFailInfo(); int value = (failure == null) ? 0 : failure.intValue(); if (value != 0) { // @todo: Translate value of 15 error codes defined by PKIFailureInfo to string throw new Exception(MessageLocalization.getComposedMessage("invalid.tsa.1.response.code.2", tsaURL, String.valueOf(value))); } // @todo: validate the time stap certificate chain (if we want // assure we do not sign using an invalid timestamp). // extract just the time stamp token (removes communication status info) TimeStampToken tsToken = response.getTimeStampToken(); if (tsToken == null) { throw new Exception(MessageLocalization.getComposedMessage( "tsa.1.failed.to.return.time.stamp.token.2", tsaURL, response.getStatusString())); } TimeStampTokenInfo info = tsToken.getTimeStampInfo(); // to view details byte[] encoded = tsToken.getEncoded(); long stop = System.currentTimeMillis(); // Update our token size estimate for the next call (padded to be safe) this.tokSzEstimate = encoded.length + 32; return encoded; } catch (Exception e) { throw e; } catch (Throwable t) { throw new Exception(MessageLocalization.getComposedMessage("failed.to.get.tsa.response.from.1", tsaURL), t); } } /** * Get timestamp token - communications layer * @return - byte[] - TSA response, raw bytes (RFC 3161 encoded) */ protected byte[] getTSAResponse(byte[] requestBytes) throws Exception { // Setup the TSA connection URL url = new URL(tsaURL); URLConnection tsaConnection; tsaConnection = (URLConnection) url.openConnection(); tsaConnection.setDoInput(true); tsaConnection.setDoOutput(true); tsaConnection.setUseCaches(false); tsaConnection.setRequestProperty("Content-Type", "application/timestamp-query"); //tsaConnection.setRequestProperty("Content-Transfer-Encoding", "base64"); tsaConnection.setRequestProperty("Content-Transfer-Encoding", "binary"); if ((tsaUsername != null) && !tsaUsername.equals("")) { String userPassword = tsaUsername + ":" + tsaPassword; tsaConnection.setRequestProperty("Authorization", "Basic " + new String(Base64.encodeBytes(userPassword.getBytes()))); } OutputStream out = tsaConnection.getOutputStream(); out.write(requestBytes); out.close(); // Get TSA response as a byte array InputStream inp = tsaConnection.getInputStream(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = inp.read(buffer, 0, buffer.length)) >= 0) { baos.write(buffer, 0, bytesRead); } byte[] respBytes = baos.toByteArray(); String encoding = tsaConnection.getContentEncoding(); if (encoding != null && encoding.equalsIgnoreCase("base64")) { respBytes = Base64.decode(new String(respBytes)); } return respBytes; } }