Hi,
I need to add a signature to an existing PDF document. I am using the
PdfStamper to create the signature.
So far this works. But I have problems with PDF version 1.2.
I tried to set the PDF version in the PdfStamper as following:
PdfStamper stp = PdfStamper.createSignature(reader, fout,
PdfWriter.VERSION_1_4, new File(
"/temp"), true);
But the resulting PDF with the signature has always the same version
than the original file (version 1.2 in my case). It ignores the version
I specify in the method (PdfWriter.VERSION_1_4).
Full code:
KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream("src/test/resources/thawtetest.p12"),
"12345678".toCharArray());
String alias = (String) ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias,
"12345678".toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader("src/test/resources/input12.pdf");
FileOutputStream fout = new FileOutputStream("test.pdf");
PdfStamper stp = PdfStamper.createSignature(reader, fout,
PdfWriter.VERSION_1_4, new File(
"/temp"), true);
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
sap.setReason("I'm the author");
sap.setLocation("Lisbon");
sap.setAcro6Layers(true);
// comment next line to have an invisible signature
sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
stp.close();
Can anyone give me a hint how to set the PDF version of the output PDF?
Kind regards,
Rafael
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