using System.IO;
using iTextSharp.text.pdf;
using System.Diagnostics;
//---- for this itextsharp.dll is required.
protected void Page_Load(object sender, EventArgs e)
{
string PDFPath = @"D:\Project\screen_mock_up.pdf";
string Password = "abc123";
PasswordProtectPDF(PDFPath, Password);
DecryptPassword(PDFPath, Password);
}
private void PasswordProtectPDF(string strPDFPath, string strPassword)
{
try
{
Stream input = new FileStream(strPDFPath, FileMode.Open, FileAccess.Read, FileShare.Read);
byte[] btSourceFile = StreamToByteArray(input);
input.Close();
using (Stream output = new FileStream(strPDFPath, FileMode.Create, FileAccess.Write, FileShare.None))
{
PdfReader reader = new PdfReader(btSourceFile);
reader.Close();
PdfEncryptor.Encrypt(reader, output, true, strPassword, strPassword, PdfWriter.ALLOW_PRINTING);
}
}
catch(Exception ex)
{
}
}
static byte[] StreamToByteArray(Stream inputStream)
{
if (!inputStream.CanRead)
{
throw new ArgumentException();
}
// This is optional
if (inputStream.CanSeek)
{
inputStream.Seek(0, SeekOrigin.Begin);
}
byte[] output = new byte[inputStream.Length];
int bytesRead = inputStream.Read(output, 0, output.Length);
Debug.Assert(bytesRead == output.Length, "Bytes read from stream matches stream length");
return output;
}
private void DecryptPassword(string strPDFPath, string strPassword)
{
try
{
byte[] btPassword;
btPassword = StrToByteArray(strPassword);
Stream input = new FileStream(strPDFPath, FileMode.Open, FileAccess.Read, FileShare.Read);
byte[] btSourceFile = StreamToByteArray(input);
input.Close();
PdfReader reader = new PdfReader(btSourceFile, btPassword);
////@+ decryption routine
if (reader.IsOpenedWithFullPermissions)
{
PdfStamper pdfstmpr = new PdfStamper(reader, new FileStream(strPDFPath, FileMode.Create, FileAccess.Write, FileShare.None));
pdfstmpr.Close();
}
}
catch
{
}
}
public static byte[] StrToByteArray(string str)
{
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
return encoding.GetBytes(str);
}
