Add Password in PDF File

naimish's Avatar author of Add Password in PDF File
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This is an article on Add Password in PDF File in ASP.NET.
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Background



This article continues my previous one, to add watermark in PDF files, now we will go ahead and look how to add password in PDF File. Please check Add WaterMark In PDF Files.

The code



Code: VB.NET
Imports System
Imports System.IO
Imports iTextSharp.text
Imports iTextSharp.text.pdf
Public Class Form1
Inherits System.Windows.Forms.Form
    Private Sub brnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles brnOpen.Click
        Dim FldBrow As OpenFileDialog = New OpenFileDialog()
        FldBrow.Title = "Select PDF File To Add WaterMark"
        FldBrow.InitialDirectory = "c:\"
        FldBrow.Filter = "PDF Files (*.pdf)|*.pdf"
        FldBrow.FilterIndex = 2
        FldBrow.RestoreDirectory = True
        If FldBrow.ShowDialog() = Windows.Forms.DialogResult.OK Then
            txtPath.Text = FldBrow.FileName
        End If
    End Sub
    
    Private Sub breimgopen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles breimgopen.Click
        MessageBox.Show(txtpass.Text)
    End Sub

    Private Sub btnoutput_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnoutput.Click
        Dim sfd1 As SaveFileDialog = New SaveFileDialog()
        sfd1.Title = "Save Output File"
        sfd1.InitialDirectory = "c:\"
        sfd1.Filter = "PDF files (*.pdf)|*.pdf"
        sfd1.FilterIndex = 2
        sfd1.RestoreDirectory = True
        If sfd1.ShowDialog() = Windows.Forms.DialogResult.OK Then
            txtoutpath.Text = sfd1.FileName
        End If
    End Sub

    Private Sub btnexit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnexit.Click
        End
    End Sub
    
    Private Sub btnAddWaterMark_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddWaterMark.Click
        Dim input As String = ""
        Dim output As String = ""
        Dim password As String = ""
        input = txtPath.Text
        password = txtpass.Text
        output = txtoutpath.Text

        AddPasswordToPDF(input, output, password)
    End Sub

    Private Sub AddPasswordToPDF(ByVal sourceFile As String, ByVal outputFile As String, ByVal password As String)
        Dim pReader As PdfReader = New PdfReader(sourceFile)
        PdfEncryptor.Encrypt(pReader, New FileStream(outputFile, FileMode.Open), PdfWriter.STRENGTH128BITS, password, Nothing, PdfWriter.AllowScreenReaders)
    End Sub
End Class
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Team Leader
2Jul2009,11:54   #2
pradeep's Avatar
What are the Libraries required to implement this?
Banned
2Jul2009,12:02   #3
naimish's Avatar
Libraries ? The code itself works, refer to my previous post for steps.
Last edited by naimish; 2Jul2009 at 12:04..
Invasive contributor
2Jul2009,13:04   #4
nimesh's Avatar
Quote:
Originally Posted by pradeep View Post
What are the Libraries required to implement this?
You will need iTextSharp.dll
Naimish had mentioned this in the other article.
Banned
2Jul2009,13:58   #5
naimish's Avatar
Thanks for clerifying nimesh
Go4Expert Member
13Jul2009,22:06   #6
night.rider's Avatar
sir really ... this adding password to pdf works and i wrote in C#.net
it really works... awesome yaar...

sir can u tell me if before encryption the pdf is encrypted then wat to do becoz the pdfencrypter gives error...

sir please , if more u can tell abt all this and more
Go4Expert Member
13Jul2009,22:07   #7
night.rider's Avatar
Quote:
Originally Posted by night.rider View Post
sir really ... this adding password to pdf works and i wrote in C#.net
it really works... awesome yaar...

sir can u tell me if before encryption the pdf is encrypted then wat to do becoz the pdfencrypter gives error...

sir please , if more u can tell abt all this and more

C#.net code as below
Code:
        private void btnopen_Click(object sender, EventArgs e)
        {
            OpenFileDialog FldBrow = new OpenFileDialog();
            FldBrow.Title = "Select PDF To Add Password";
            FldBrow.InitialDirectory="c:\\";
            FldBrow.Filter = "PDF Files (*.pdf)|*.pdf";
            FldBrow.FilterIndex = 2;
            FldBrow.RestoreDirectory=true;
            if(FldBrow.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                textBox1.Text=FldBrow.FileName;
        }

        private void Save_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd1=new SaveFileDialog();
            sfd1.Title = "Save Output File";
            sfd1.InitialDirectory = "My Documents\\";
            sfd1.Filter = "PDF files (*.pdf)|*.pdf";
            sfd1.FilterIndex = 2;
            sfd1.RestoreDirectory = true;
            if(sfd1.ShowDialog()==System.Windows.Forms.DialogResult.OK)
                textBox2.Text=sfd1.FileName;
        }

        private void addpwd_Click(object sender, EventArgs e)
        {
            string input = "";
            string output = "";
            string password = "";
            input = textBox1.Text;
            output = textBox2.Text;
            password = txtpass.Text;

            Add_pwd_to_pdf(input, output, password);
        }

        private void Add_pwd_to_pdf(string input, string output, string password)
        {
            //string ownpwd = "123";
            PdfReader preader = new PdfReader(input);
            PdfEncryptor.Encrypt(preader, new FileStream(output, FileMode.Append), PdfWriter.STRENGTH128BITS, password,"",PdfWriter.ALLOW_SCREENREADERS);
        }
Go4Expert Founder
15Jul2009,23:21   #8
shabbir's Avatar
Start voting for this article for Article of the month - June 2009
Go4Expert Founder
3Aug2009,14:35   #9
shabbir's Avatar
Nominate this article for Article of the month - Jul 2009
Go4Expert Member
13Aug2009,16:03   #10
dasli's Avatar
ooo...
thanks
naimish like this
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