iText7 Encryption PdfDocument

Question

In upgrading iText7 I see there need to be a EncryptionConstants.ENCRYPTION_AES_128 Is that correct. I am also not seeing how to add the writerProperties to my PdfDocument

Old Version

pdfDocument.Writer.SetEncryption(true, null, null, PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING);

New Version

WriterProperties writerProperties = new WriterProperties();
writerProperties.SetStandardEncryption(null, null, EncryptionConstants.ALLOW_PRINTING | EncryptionConstants.ALLOW_COPY, EncryptionConstants.ENCRYPTION_AES_128);

Answer 1

Please check the below code of iText 7 for adding or encrypting pdf files with owner and user password.

public class EncryptPdf
{
    public static readonly String DEST = "results/sandbox/security/encrypt_pdf.pdf";
    public static readonly String SRC = "../../../resources/pdfs/hello.pdf";

    public static readonly String OWNER_PASSWORD = "World";
    public static readonly String USER_PASSWORD = "Hello";

    public static void Main(String[] args)
    {
        FileInfo file = new FileInfo(DEST);
        file.Directory.Create();

        new EncryptPdf().ManipulatePdf(DEST);
    }

    protected void ManipulatePdf(String dest)
    {
        PdfDocument document = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest,
            new WriterProperties().SetStandardEncryption(
                Encoding.UTF8.GetBytes(USER_PASSWORD),
                Encoding.UTF8.GetBytes(OWNER_PASSWORD),
                EncryptionConstants.ALLOW_PRINTING,
                EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA
            )));
        document.Close();
    }
}