Hi, I'm trying to remove a signature from the attached sample PDF with itextpdf 5.5.8 and save the result in another file using this java code:
Provider provider = new BouncyCastleProvider();
Security.addProvider(provider);
PdfReader reader = new PdfReader(inputStream,
null);
AcroFields af = reader.getAcroFields();
ArrayList<String> names = af.getSignatureNames();
for (String name : names) {
System.out.println("Signature name: " +
name);
System.out.println("Signature covers whole
document: " + af.signatureCoversWholeDocument(name));
PdfPKCS7 pk = af.verifySignature(name,
provider.getName());
System.out.println("SignatureDate: " +
pk.getSignDate());
System.out.println("Certificate: " +
pk.getSigningCertificate());
System.out.println("Document modified: " +
!pk.verify());
af.removeField(name);
}
PdfStamper stamper = new PdfStamper(reader,
outputStream, '\0');
stamper.close();
But I have this exception in removeField:
Exception in thread "main" java.lang.NullPointerException
at com.itextpdf.text.pdf.AcroFields.removeField(AcroFields.java:1814)
at com.itextpdf.text.pdf.AcroFields.removeField(AcroFields.java:1854)
at securityframe.cms.VerificaFirmaCerta.verify(VerificaFirmaCerta.java:47)
at securityframe.cms.VerificaFirmaCerta.main(VerificaFirmaCerta.java:67)
The attached file is signed with FirmaCerta (a italian sw).
Anyone can help me? There is a bug in the signature sw or in the itext library?
Thanks in advance.
Alfonso
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PDFSignedFirmaCerta.pdf
Description: PDFSignedFirmaCerta.pdf
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