java program to password protect a signed pdf file

[pavithra murthy]

hello friend ,

i have written a java code for protecting and digitally signing . but i am giving one pdf file as input and the protected pdf as output using jpdfsecure.jar in first try catch block ....in the second try catch block digital signing of pdf using itext.jar .

but after protecting the pdf and that pretected pdf is input for digitally signing code

PdfReader reader = new PdfReader("ch01out.pdf");
int nomPage = reader.getNumberOfPages();
System.out.println("nomPage: "+nomPage);

at this time if the pdf contains 30 pages ,,,the number of pages coming is 10 pages .please could anyone help me out

import java.util.*;
import com.qoppa.pdf.PDFPermissions;
import com.qoppa.pdfSecure.PDFSecure;
import java.lang.*;
import java.security.*;
import com.qoppa.pdfSecure.*;
import com.qoppa.pdf.*;
import java.io.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Iterator;

import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.AcroFields;
import com.lowagie.text.pdf.PdfPKCS7;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfSignatureAppearance;
import com.lowagie.text.pdf.PdfStamper;

public class Non
{
    public static void main (String [] args)
    {
		
        try
        {
            String password="";String username="";
//....................
HashMap hm = new HashMap(); 
BufferedReader dataIn = new BufferedReader(new InputStreamReader( System.in) );

System.out.println("USERNAME"+":"+"PASSWORD");
hm .put("pavithra", "pvm4kor");
hm .put("shompa", "sos5kor");
hm .put("vinod", "vim2kor");
hm .put("shiva", "snk3kor");

	// Get a set of the entries
	Set set = hm.entrySet();
	// Get an iterator
	Iterator i = set.iterator();

//System.out.println("Please enter your protection password");
//   			password = dataIn.readLine();

System.out.println("Please enter your username");
   			username = dataIn.readLine();



// Display elements
 String mName;
while(i.hasNext()) {
                               
		 Map.Entry me = (Map.Entry)i.next();
		 System.out.print(me.getKey() + ": ");
                                 System.out.println(me.getValue());
                                  
                                 //cheks when username is entered with the password                         
if   (username.equals((String)me.getKey())) {
                                         password= (String)me.getValue();
                                                                  }

//code password protect pdf 
                                  if (password.equals((String)me.getValue()))
                                        {
                                        System.out.println("hello");
                                         mName=(String)me.getValue();
                                            
                                         // Load the document
                                         PDFSecure pdfSecure = new PDFSecure ("e:\\ch01.pdf", null);
            
                                         // Create permissions object to allow printing only
                                         PDFPermissions perms = new PDFPermissions (false);
                                         perms.setPrintAllowed(false);

              // Set document security
             pdfSecure.setSecurity(null, password, perms, null,PDFPermissions.ENCRYPTION_RC4);
                                          //  break;
 // Check if there are open and permissions passwords
            System.out.println ("Open Password - " + getYesNo (pdfSecure.hasOpenPassword()));
            System.out.println ("Permissiosn Password - " + 
getYesNo(pdfSecure.hasPermissionsPassword()));
            System.out.println ();

            // Save the document
            pdfSecure.saveDocument ("ch01out.pdf");

			PdfReader reader = new PdfReader("ch01out.pdf");
            int nomPage = reader.getNumberOfPages();
			System.out.println("nomPage: "+nomPage);
  
            //vvvvvvvvvvvvvvvvvvvvvvvvvvvvdigitally signing code 
try{
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(new FileInputStream("keystore.ks"), "my_password".toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
java.security.cert.Certificate[] chain = ks.getCertificateChain(alias);
//PdfReader reader = new PdfReader("ch01out.pdf");
      
			for (int j=1; j<=nomPage; j++)
			{

				FileOutputStream fout = new FileOutputStream("signed"+j+".pdf");
				//PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
				PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0', null, true);
				//PdfStamper.setEncryption(chain,AllowDegradedPrinting,ENCRYPTION_AES);
				PdfSignatureAppearance sap = stp.getSignatureAppearance();
				sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
				sap.setReason("I'm the author");
				sap.setLocation("Lisbon");
				// comment next line to have an invisible signature
				sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), j, null);
				stp.close();
				reader = new PdfReader("signed"+j+".pdf");
			}
    		for(int j=1;j<=nomPage;j++)
			{
				File fileStr = new File("signed"+j+".pdf");
				if(j!=nomPage)
				{
					fileStr.delete();
				}
				//to verify sign
				if(j == nomPage)
				{
					try {
						CertificateFactory cf = CertificateFactory.getInstance("X509");
						Collection col = cf.generateCertificates(new FileInputStream("export.cer"));
						KeyStore kall = KeyStore.getInstance(KeyStore.getDefaultType());
						kall.load(null, null);
						for (Iterator it = col.iterator(); it.hasNext();) {
						    X509Certificate cert = (X509Certificate)it.next();
						    kall.setCertificateEntry(cert.getSerialNumber().toString(Character.MAX_RADIX), cert);
						}
						//KeyStore kall = PdfPKCS7.loadCacertsKeyStore();
						PdfReader reader2 = new PdfReader("signed"+j+".pdf");
						AcroFields af = reader2.getAcroFields();
						ArrayList names = af.getSignatureNames();
						for (int k = 0; k < names.size(); ++k) 
						{
							String name = (String)names.get(k);
							System.out.println("Signature name: " + name);
							System.out.println("Signature covers whole document: " + af.signatureCoversWholeDocument(name));
							System.out.println("Document revision: " + af.getRevision(name) + " of " + af.getTotalRevisions());
							
							PdfPKCS7 pk = af.verifySignature(name);
							Calendar cal = pk.getSignDate();
							java.security.cert.Certificate pkc[] = pk.getCertificates();
							System.out.println("Subject: " + PdfPKCS7.getSubjectFields(pk.getSigningCertificate()));
							System.out.println("Document modified: " + !pk.verify());
							Object fails[] = PdfPKCS7.verifyCertificates(pkc, kall, null, cal);
							if (fails == null)
								System.out.println("Certificates verified against the KeyStore");
							else
								System.out.println("Certificate failed: " + fails[1]);
						}
					}
					catch(Exception e) {e.printStackTrace();}
				}

			}

}
catch(Exception e) {e.printStackTrace();}

//vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
                                             } // if password correct 
   		                    } //while
                         //...................       
						 

                             } //first try close
        catch (Throwable t) {  t.printStackTrace();  }




    }
 
      private static String getYesNo (boolean yes)
       {
           if (yes)
            {return "Yes";}
        else
            {return "No";}
       }
}