/*
* 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.tools;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyStore;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.AccessPermission;
import org.apache.pdfbox.pdmodel.encryption.DecryptionMaterial;
import org.apache.pdfbox.pdmodel.encryption.PublicKeyDecryptionMaterial;
import org.apache.pdfbox.pdmodel.encryption.StandardDecryptionMaterial;
/**
* This will read a document from the filesystem, decrypt it and and then write
* the results to the filesystem. <br/><br/>
*
* usage: java org.apache.pdfbox.tools.Decrypt <password> <inputfile> <outputfile>
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.5 $
*/
public class Decrypt
{
private static final String ALIAS = "-alias";
private static final String PASSWORD = "-password";
private static final String KEYSTORE = "-keyStore";
private Decrypt()
{
}
/**
* This is the entry point for the application.
*
* @param args The command-line arguments.
*
* @throws Exception If there is an error decrypting the document.
*/
public static void main( String[] args ) throws Exception
{
// suppress the Dock icon on OS X
System.setProperty("apple.awt.UIElement", "true");
Decrypt decrypt = new Decrypt();
decrypt.decrypt( args );
}
private void decrypt( String[] args ) throws Exception
{
if( args.length < 2 || args.length > 5 )
{
usage();
}
else
{
String password = null;
String infile = null;
String outfile = null;
String alias = null;
String keyStore = null;
for( int i=0; i<args.length; i++ )
{
if( args[i].equals( ALIAS ) )
{
i++;
if( i >= args.length )
{
usage();
}
alias = args[i];
}
else if( args[i].equals( KEYSTORE ) )
{
i++;
if( i >= args.length )
{
usage();
}
keyStore = args[i];
}
else if( args[i].equals( PASSWORD ) )
{
i++;
if( i >= args.length )
{
usage();
}
password = args[i];
}
else if( infile == null )
{
infile = args[i];
}
else if( outfile == null )
{
outfile = args[i];
}
else
{
usage();
}
}
if( infile == null )
{
usage();
}
if( outfile == null )
{
outfile = infile;
}
if( password == null )
{
password = "";
}
PDDocument document = null;
try
{
document = PDDocument.load( infile );
if( document.isEncrypted() )
{
DecryptionMaterial decryptionMaterial = null;
if( keyStore != null )
{
KeyStore ks = KeyStore.getInstance("PKCS12");
ks.load(new FileInputStream(keyStore), password.toCharArray());
decryptionMaterial = new PublicKeyDecryptionMaterial(ks, alias, password);
}
else
{
decryptionMaterial = new StandardDecryptionMaterial(password);
}
document.openProtection(decryptionMaterial);
AccessPermission ap = document.getCurrentAccessPermission();
if(ap.isOwnerPermission())
{
document.setAllSecurityToBeRemoved(true);
document.save( outfile );
}
else
{
throw new IOException(
"Error: You are only allowed to decrypt a document with the owner password." );
}
}
else
{
System.err.println( "Error: Document is not encrypted." );
}
}
finally
{
if( document != null )
{
document.close();
}
}
}
}
/**
* This will print a usage message.
*/
private static void usage()
{
System.err.println( "usage: java -jar pdfbox-app-x.y.z.jar Decrypt " +
"[options] <inputfile> [outputfile]" );
System.err.println( "-alias The alias of the key in the certificate file " +
"(mandatory if several keys are available)");
System.err.println( "-password The password to open the certificate and extract the private key from it." );
System.err.println( "-keyStore The KeyStore that holds the certificate." );
System.exit( -1 );
}
}