Add Password and Encrypt-Decrypt PDF using iText in Java
February 07, 2015
PdfWriter.setEncryption(byte[] userPassword, byte[] ownerPassword, int permissions, int encryptionType)
To add password to a new PDF, we need to use PdfWriter.setEncryption() method. This method accepts argumentsUser password as bytes
Owner Password bytes
Permission for PDF
Encrption Type
We can set different type of permissions to PDF
PdfWriter.ALLOW_PRINTING
PdfWriter.ALLOW_COPY
There are different encryption type as given below.
ENCRYPTION_AES_128
STANDARD_ENCRYPTION_128
STANDARD_ENCRYPTION_40
ENCRYPTION_AES_256
PdfStamper.setEncryption(byte[] userPassword, byte[] ownerPassword, int permissions, int encryptionType)
PdfStamper API is used when we need to protect existing PDF. While instantiating PdfStamper, it accepts source file as PdfReader and destination file as OutputStream. PdfStamper can add some extra content in PDF while writing to destination file. PdfStamper.setEncryption uses the same arguments as PdfWriter.setEncryption while setting the encryption to existing PDF.Add Password to PDF
This program will show how to create a PDF file with password.CreatePDFwithPassword.java
package com.concretepage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
public class CreatePDFwithPassword {
public static void main(String[] args) throws DocumentException, MalformedURLException, IOException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("PDFwithPasswordOne.pdf"));
writer.setEncryption("concretepage".getBytes(), "cp123".getBytes(), PdfWriter.ALLOW_COPY, PdfWriter.STANDARD_ENCRYPTION_40);
writer.createXmpMetadata();
document.open();
document.add(new Paragraph("This is create PDF with Password demo."));
document.close();
System.out.println("Done");
}
}
Decrypt Password Protected PDF
In this example we will read a PDF which is password protected. While reading such PDF, we need owner password.ReadPasswordProtectedPDF.java
package com.concretepage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
public class ReadPasswordProtectedPDF {
public static void main(String[] args) throws FileNotFoundException, DocumentException, IOException {
PdfReader reader = new PdfReader("PDFwithPasswordOne.pdf", "cp123".getBytes());
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("NoPasswordPDF.pdf"));
stamper.close();
reader.close();
System.out.println("Done");
}
}
Encrypt Unprotected PDF with Password
Here we will read an unprotected PDF and write data to another password protected PDF.ReadPDFtoAddPassword.java
package com.concretepage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
public class ReadPDFtoAddPassword {
public static void main(String[] args) throws FileNotFoundException, DocumentException, IOException {
PdfReader reader = new PdfReader("NoPasswordPDF.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("PDFwithPasswordTwo.pdf"));
stamper.setEncryption("pwd123".getBytes(), "cp123".getBytes(),PdfWriter.ALLOW_COPY, PdfWriter.ENCRYPTION_AES_256);
stamper.close();
reader.close();
System.out.println("Done");
}
}
build.gradle
To resolve JAR for iText, bcprov-jdk15on and bcpkix-jdk15on, we need to use below gradle file.build.gradle
apply plugin: 'java'
apply plugin: 'eclipse'
archivesBaseName = 'ITEXT'
version = '1'
repositories {
mavenCentral()
}
dependencies {
compile 'com.itextpdf:itextpdf:5.5.4'
compile 'org.bouncycastle:bcprov-jdk15on:1.51'
compile 'org.bouncycastle:bcpkix-jdk15on:1.51'
}
