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/*
* $Id: PdfPublicKeySecurityHandler.java 3373 2008-05-12 16:21:24Z xlv $
*
* Copyright 2006 Paulo Soares
*
* 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) 1999-2007 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2007 by Paulo Soares. 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/
*/
/**
* The below 2 methods are from pdfbox.
*
* private DERObject createDERForRecipient(byte[] in, X509Certificate cert) ;
* private KeyTransRecipientInfo computeRecipientInfo(X509Certificate x509certificate, byte[] abyte0);
*
* 2006-11-22 Aiken Sam.
*/
/**
* Copyright (c) 2003-2006, www.pdfbox.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of pdfbox; nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* http://www.pdfbox.org
*
*/
package com.aowagie.text.pdf;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.AlgorithmParameterGenerator;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import org.spongycastle.asn1.ASN1InputStream;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Set;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DEROutputStream;
import org.spongycastle.asn1.DERSet;
import org.spongycastle.asn1.cms.ContentInfo;
import org.spongycastle.asn1.cms.EncryptedContentInfo;
import org.spongycastle.asn1.cms.EnvelopedData;
import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
import org.spongycastle.asn1.cms.KeyTransRecipientInfo;
import org.spongycastle.asn1.cms.RecipientIdentifier;
import org.spongycastle.asn1.cms.RecipientInfo;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.TBSCertificateStructure;
/**
* @author Aiken Sam ([email protected])
*/
class PdfPublicKeySecurityHandler {
private static final int SEED_LENGTH = 20;
private ArrayList recipients = null;
private byte[] seed = new byte[SEED_LENGTH];
public PdfPublicKeySecurityHandler() {
KeyGenerator key;
try {
key = KeyGenerator.getInstance("AES");
key.init(192, new SecureRandom());
final SecretKey sk = key.generateKey();
System.arraycopy(sk.getEncoded(), 0, this.seed, 0, SEED_LENGTH); // create the 20 bytes seed
} catch (final NoSuchAlgorithmException e) {
this.seed = SecureRandom.getSeed(SEED_LENGTH);
}
this.recipients = new ArrayList();
}
/*
* Routine for decode output of PdfContentByte.escapeString(byte[] bytes).
* It should be moved to PdfContentByte.
*/
void addRecipient(final PdfPublicKeyRecipient recipient) {
this.recipients.add(recipient);
}
protected byte[] getSeed() {
return this.seed.clone();
}
/*
public PdfPublicKeyRecipient[] getRecipients() {
recipients.toArray();
return (PdfPublicKeyRecipient[])recipients.toArray();
}*/
public int getRecipientsSize() {
return this.recipients.size();
}
public byte[] getEncodedRecipient(final int index) throws IOException, GeneralSecurityException {
//Certificate certificate = recipient.getX509();
final PdfPublicKeyRecipient recipient = (PdfPublicKeyRecipient)this.recipients.get(index);
byte[] cms = recipient.getCms();
if (cms != null) {
return cms;
}
final Certificate certificate = recipient.getCertificate();
int permission = recipient.getPermission();//PdfWriter.AllowCopy | PdfWriter.AllowPrinting | PdfWriter.AllowScreenReaders | PdfWriter.AllowAssembly;
final int revision = 3;
permission |= revision==3 ? 0xfffff0c0 : 0xffffffc0;
permission &= 0xfffffffc;
permission += 1;
final byte[] pkcs7input = new byte[24];
final byte one = (byte)permission;
final byte two = (byte)(permission >> 8);
final byte three = (byte)(permission >> 16);
final byte four = (byte)(permission >> 24);
System.arraycopy(this.seed, 0, pkcs7input, 0, 20); // put this seed in the pkcs7 input
pkcs7input[20] = four;
pkcs7input[21] = three;
pkcs7input[22] = two;
pkcs7input[23] = one;
final ASN1Primitive obj = createDERForRecipient(pkcs7input, (X509Certificate)certificate);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DEROutputStream k = new DEROutputStream(baos);
k.writeObject(obj);
cms = baos.toByteArray();
recipient.setCms(cms);
return cms;
}
public PdfArray getEncodedRecipients() throws IOException,
GeneralSecurityException {
PdfArray EncodedRecipients = new PdfArray();
byte[] cms = null;
for (int i=0; i
