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iText, a free Java-PDF library
/*
* $Id: TSAClientBouncyCastle.java 3973 2009-06-16 10:30:31Z psoares33 $
*
* Copyright 2009 Martin Brunecky, Aiken Sam
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999-2005 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2009 by Martin Brunecky. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
import java.io.*;
import java.math.*;
import java.net.*;
import org.bouncycastle.asn1.cmp.*;
import org.bouncycastle.asn1.x509.*;
import org.bouncycastle.tsp.*;
import com.lowagie.text.pdf.codec.Base64;
/**
* Time Stamp Authority Client interface implementation using Bouncy Castle
* org.bouncycastle.tsp package.
*
* Created by Aiken Sam, 2006-11-15, refactored by Martin Brunecky, 07/15/2007
* for ease of subclassing.
*
* @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.lowagie.text.pdf.TSAClient#getTimeStampToken(com.lowagie.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("Invalid TSA '" + tsaURL + "' response, code " + 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("TSA '" + tsaURL + "' failed to return time stamp token: " + 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("Failed to get TSA response from '" + 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;
}
}