Hello,
I want to sign a PDF with the following code:
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
System.out.println(ks.getProvider());
ks.load(new FileInputStream("C:\\j2sdk1.4.2_05\\bin\\keystore3.ks"),
pass.toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey)ks.getKey(alias, pass.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader("c:\\Antrag.pdf");
FileOutputStream fout = new FileOutputStream("c:\\signed.pdf");
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(key, chain, null, PdfSignatureAppearance.VERISIGN_SIGNED);
sap.setReason("I'm the author");
sap.setLocation("Saarbrücken");
sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
sap.setCertified(true);
stp.close();
If I use a self signed Certificate the code run with no problem. But if I
import my Versign Certificate in the keystore I get the follow Message.
java.lang.NullPointerException
at
com.lowagie.text.pdf.PdfSignatureAppearance.getAppearance(PdfSignatureAppearance.java:395)
at
com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:902)
at
com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:847)
at com.lowagie.text.pdf.PdfStamper.close(PdfStamper.java:175)
at de.jens.kelkel.PDFSignature.main(PDFSignature.java:89)
Exception in thread "main"
Have anybody a solution fort hat problem??
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