/*
* 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.examples.signature;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.Collection;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.StandardDecryptionMaterial;
/**
* This will read a document from the filesystem, decrypt it and do something with the signature.
* usage: java org.apache.pdfbox.examples.signature.ShowSignature <password> <inputfile>
*
* @author Ben Litchfield
*/
public class ShowSignature
{
private ShowSignature()
{
}
/**
* This is the entry point for the application.
*
* @param args The command-line arguments.
*
* @throws Exception If there is an error reading the file.
*/
public static void main( String[] args ) throws IOException, CertificateException
{
ShowSignature show = new ShowSignature();
show.showSignature( args );
}
private void showSignature( String[] args ) throws IOException, CertificateException
{
if( args.length != 2 )
{
usage();
}
else
{
String password = args[0];
String infile = args[1];
PDDocument document = null;
try
{
document = PDDocument.load( infile );
if( document.isEncrypted() )
{
StandardDecryptionMaterial sdm = new StandardDecryptionMaterial(password);
document.openProtection(sdm);
}
else
{
System.err.println( "Warning: Document is not encrypted." );
}
COSDictionary trailer = document.getDocument().getTrailer();
COSDictionary root = (COSDictionary)trailer.getDictionaryObject( COSName.ROOT );
COSDictionary acroForm = (COSDictionary)root.getDictionaryObject( COSName.ACRO_FORM );
COSArray fields = (COSArray)acroForm.getDictionaryObject( COSName.FIELDS );
for( int i=0; i<fields.size(); i++ )
{
COSDictionary field = (COSDictionary)fields.getObject( i );
String type = field.getNameAsString( "FT" );
if( "Sig".equals( type ) )
{
COSDictionary cert = (COSDictionary)field.getDictionaryObject( COSName.V );
if( cert != null )
{
System.out.println( "Certificate found" );
System.out.println( "Name=" + cert.getDictionaryObject( COSName.NAME ) );
System.out.println( "Modified=" + cert.getDictionaryObject( COSName.getPDFName( "M" ) ) );
COSName subFilter = (COSName)cert.getDictionaryObject( COSName.getPDFName( "SubFilter" ) );
if( subFilter != null )
{
if( subFilter.getName().equals( "adbe.x509.rsa_sha1" ) )
{
COSString certString = (COSString)cert.getDictionaryObject(
COSName.getPDFName( "Cert" ) );
byte[] certData = certString.getBytes();
CertificateFactory factory = CertificateFactory.getInstance( "X.509" );
ByteArrayInputStream certStream = new ByteArrayInputStream( certData );
Collection certs = factory.generateCertificates( certStream );
System.out.println( "certs=" + certs );
}
else if( subFilter.getName().equals( "adbe.pkcs7.sha1" ) )
{
COSString certString = (COSString)cert.getDictionaryObject(
COSName.CONTENTS );
byte[] certData = certString.getBytes();
CertificateFactory factory = CertificateFactory.getInstance( "X.509" );
ByteArrayInputStream certStream = new ByteArrayInputStream( certData );
Collection certs = factory.generateCertificates( certStream );
System.out.println( "certs=" + certs );
}
else
{
System.err.println( "Unknown certificate type:" + subFilter );
}
}
else
{
throw new IOException( "Missing subfilter for cert dictionary" );
}
}
else
{
System.out.println( "Signature found, but no certificate" );
}
}
}
}
finally
{
if( document != null )
{
document.close();
}
}
}
}
/**
* This will print a usage message.
*/
private static void usage()
{
System.err.println( "usage: java org.apache.pdfbox.examples.signature.ShowSignature " +
"<password> <inputfile>" );
}
}