/**
* This will encrypt a string.
*
* @param string the string to encrypt.
* @param objNum The object number.
* @param genNum The object generation number.
*
* @throws IOException If an error occurs writing the new string.
*/
public void EncryptString(PdfString pdfString, long objNum, int genNum)
{
using (var data = new MemoryStream(pdfString.GetBuffer()))
using (var buffer = new MemoryStream())
{
if (EncryptData(objNum, genNum, data, buffer, false /* encrypt */))
{
pdfString.SetBuffer(buffer.GetBuffer());
}
}
}
/**
* This will decrypt a string.
*
* @param string the string to decrypt.
* @param objNum The object number.
* @param genNum The object generation number.
*
* @throws IOException If an error occurs writing the new string.
*/
private void DecryptString(PdfString pdfString, long objNum, long genNum)
{
// String encrypted with identity filter
if (PdfName.Identity.Equals(stringFilterName))
{
return;
}
using (var data = new MemoryStream(pdfString.GetBuffer()))
using (var outputStream = new MemoryStream())
{
try
{
if (EncryptData(objNum, genNum, data, outputStream, true /* decrypt */))
{
pdfString.SetBuffer(outputStream.ToArray());
}
}
catch (Exception ex)
{
Debug.WriteLine($"error: Failed to decrypt PdfString of Length {pdfString.GetBuffer().Length} in object {objNum}: {ex.Message}", ex);
}
}
}
