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package org.pdfbox.examples.signature;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.cert.CertificateFactory;
import java.util.Collection;
import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSString;
import org.pdfbox.pdmodel.PDDocument;
/**
* This will read a document from the filesystem, decrypt it and do something with the signature.
*
* usage: java org.pdfbox.examples.signature.ShowSignature <password> <inputfile>
*
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.9 $
*/
public class 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 Exception
{
ShowSignature show = new ShowSignature();
show.showSignature( args );
}
private void showSignature( String[] args ) throws Exception
{
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() )
{
document.decrypt( password );
}
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.getPDFName( "AcroForm" ) );
COSArray fields = (COSArray)acroForm.getDictionaryObject( COSName.getPDFName( "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.getPDFName( "V" ) );
if( cert != null )
{
System.out.println( "Certificate found" );
System.out.println( "Name=" + cert.getDictionaryObject( COSName.getPDFName( "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.getPDFName( "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.pdfbox.examples.signature.ShowSignature " +
"<password> <inputfile>" );
}
}