Hi All,
I am new to iText. I have a requirement where I have to apply watermark to
an existing PDF, the PDF has digital signatures.
I am using PdfStamper to apply the watermark, the code snippet is as
follows:
PdfReader reader = new PdfReader("C:/form.pdf");
int n = reader.getNumberOfPages();
FileOutputStream stampOutput = new FileOutputStream("C:/stamp.pdf");
PdfStamper stamper = new PdfStamper(reader, stampOutput);
PdfContentByte under;
PdfContentByte over;
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI,
BaseFont.EMBEDDED);
int i = 0;
while (i < n) {
over = stamper.getOverContent(i);
over.beginText();
over.setFontAndSize(bf, 8);
over.setTextMatrix(30, 30);
over.showText("Watermark Text");
over.setFontAndSize(bf, 8);
over.endText();
}
stamper.close();
The watermark works fine, but I face issue with the signatures, the digital
signature becomes invalid. When I try to view the signature in the output
PDF I get the following error:
Error during signature verification.
Unexpected byte range values defining scope of signed data.
Details: byte range of signature is invalid
I also noticed that the ouput file(87 KB) is smaller in size than the input
file(103 KB).
Can anyone point out why the signature becomes invalid, what is wrong with
the code and what is the right approach?
And also why the size of the output file decreases?
You help is very much appreciated!
Thanks in advance!
Regards,
Mohan Alagurajan
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