Making PDF Password protected in Java

There are various libraries available through to which a pdf can protected with password encryption.

Full maven repository is available here - 

But as a developer , I am using here itextpdf library and bouncyCastle libraries to make the PDF password protection.

Following is pom.xml for the dependencies : 

    <dependencies>

           <dependency>

           <groupId>com.itextpdf</groupId>

           <artifactId>itextpdf</artifactId>

          <version>5.2.1</version>

  </dependency>

  <dependency>

       <groupId>org.bouncycastle</groupId>

      <artifactId>bcprov-jdk15on</artifactId>

      <version>1.46</version>

    </dependency>

</dependencies>

So most import libraries to use are :

1 . itextpdf-5.2.1.jar 

2 . bcprov-jdk15on-1.46.jar 

Code to implement : 

       


/**

 * @author sachin

 *

 */

public class PdfEncryption {



  public static void main(String[] args) {

  try {

   String outputPdfFile = "/Users/sachin/Desktop/testing.pdf";

   String userPassword = "testing_user";

   String ownerPassword ="testing_owner"; 

   String pdfContent = "This is the demonstration of the pdf password protection";

   Document document = new Document(PageSize.A4);

   PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outputPdfFile));

   writer.setEncryption(userPassword.getBytes(), ownerPassword.getBytes(),

     PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

   document.open();

   document.addAuthor("Sachin Srivastava");

   document.addCreator("Sachin Srivastava");

   document.addSubject("Thanks for your support");

   document.addTitle("Please read this");

   HTMLWorker htmlWorker = new HTMLWorker(document);

   htmlWorker.parse(new StringReader(pdfContent));

   document.close();

   writer.close();

   System.out.println("pdf created from content");

  } catch (Exception e) {

   System.out.println("error occured in creating pdf from content");

  }

}

} 

Above  code generates a PDF named testing.pdf with the password protection.

Here PDFWriter setEncryption is used to encrypt the pdf using user password byte
array as a first parameter, owner password byte array as a second parameter, 3rd
parameter as the PDF permission(PdfWriter.ALLOW_PRINTING - 2052 ) and 4th is the
encryption type which is of two type

ENCRYPTION_AES_128
ENCRYPTION_AES_256


So enjoy coding with tek9g tips of encrypting PDF and making it password protected.