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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.pdmodel.encryption;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Iterator;
/**
* This class represents the protection policy to use to protect
* a document with the public key security handler as described
* in the PDF specification 1.6 p104.
*
* PDF documents are encrypted so that they can be decrypted by
* one or more recipients. Each recipient have its own access permission.
*
* The following code sample shows how to protect a document using
* the public key security handler. In this code sample, doc
is
* a PDDocument
object.
*
*
* PublicKeyProtectionPolicy policy = new PublicKeyProtectionPolicy();
* PublicKeyRecipient recip = new PublicKeyRecipient();
* AccessPermission ap = new AccessPermission();
* ap.setCanModify(false);
* recip.setPermission(ap);
*
* // load the recipient's certificate
* InputStream inStream = new FileInputStream(certificate_path);
* CertificateFactory cf = CertificateFactory.getInstance("X.509");
* X509Certificate certificate = (X509Certificate)cf.generateCertificate(inStream);
* inStream.close();
*
* recip.setX509(certificate); // set the recipient's certificate
* policy.addRecipient(recip);
* policy.setEncryptionKeyLength(128); // the document will be encrypted with 128 bits secret key
* doc.protect(policy);
* doc.save(out);
*
*
*
* @see org.apache.pdfbox.pdmodel.PDDocument#protect(ProtectionPolicy)
* @see AccessPermission
* @see PublicKeyRecipient
*
* @author Benoit Guillon ([email protected])
*
* @version $Revision: 1.2 $
*/
public class PublicKeyProtectionPolicy extends ProtectionPolicy
{
/**
* The list of recipients.
*/
private ArrayList recipients = null;
/**
* The X509 certificate used to decrypt the current document.
*/
private X509Certificate decryptionCertificate;
/**
* Constructor for encryption. Just creates an empty recipients list.
*/
public PublicKeyProtectionPolicy()
{
recipients = new ArrayList();
}
/**
* Adds a new recipient to the recipients list.
*
* @param r A new recipient.
*/
public void addRecipient(PublicKeyRecipient r)
{
recipients.add(r);
}
/**
* Removes a recipient from the recipients list.
*
* @param r The recipient to remove.
*
* @return true If a recipient was found and removed.
*/
public boolean removeRecipient(PublicKeyRecipient r)
{
return recipients.remove(r);
}
/**
* Returns an iterator to browse the list of recipients. Object
* found in this iterator are PublicKeyRecipient
.
*
* @return The recipients list iterator.
*/
public Iterator getRecipientsIterator()
{
return recipients.iterator();
}
/**
* Getter of the property decryptionCertificate.
*
* @return Returns the decryptionCertificate.
*/
public X509Certificate getDecryptionCertificate()
{
return decryptionCertificate;
}
/**
* Setter of the property decryptionCertificate.
*
* @param aDecryptionCertificate The decryption certificate to set.
*/
public void setDecryptionCertificate(X509Certificate aDecryptionCertificate)
{
this.decryptionCertificate = aDecryptionCertificate;
}
/**
* Returns the number of recipients.
*
* @return The number of recipients.
*/
public int getRecipientsNumber()
{
return recipients.size();
}
}