Dear IText Experts,
What part of the pdf document is signned when I use the
PdfStamper.CreateSignature and the PdfSignatureAppearance.SetCrypto method?
My code is the folowing:
PdfStamper st = PdfStamper.CreateSignature(reader, new
FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0', null,
true);
st.MoreInfo = this.metadata.getMetaData();
st.XmpMetadata = this.metadata.getStreamedMetaData();
PdfSignatureAppearance sap = st.SignatureAppearance;
sap.SetCrypto(this.myCert.Akp, this.myCert.Chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
...
st.Close();
After I signed an existing pdf document I modified some of the bytes
randomly and several times the adobe reader 9 informed me about that all of
the signatures are valid. How did it happend? I looked over the pdf 1.4
documentation and I found that the whole pdf and only a part of the pdf can
be signed as well. When I use the PdfStamper.CreateSignature which part of
the pdf doc will be signed?
Thanks
Tamas
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