Hi all,
I tried to use the following code, but some exception raised:
try {
String configFile = "c:/esigntrust/config/pkcs11.cfg";
SunPKCS11 pkcs11 = new SunPKCS11(configFile);
Security.addProvider(pkcs11);
char[] password = getPassword("Input", "Password");
KeyStore ks = KeyStore.getInstance("PKCS11");
ks.load(null, password);
String alias = getAlias(ks, 1);
// String alias = getSelQCAliasFromSM(configFile, Constant.PIN);
X509Certificate cert = getX509CertFormSM(configFile, password,
alias);
System.out.println(">>>" + cert.getSubjectDN().getName());
PrivateKey privateKey = (PrivateKey) ks.getKey(alias, password);
Certificate[] chain = ks.getCertificateChain(alias);
System.out.println(chain[0].getPublicKey());
PdfReader reader = new PdfReader("doc/test1.pdf");
FileOutputStream fout = new
FileOutputStream("doc/test1_signed.pdf");
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(privateKey, chain, null,
PdfSignatureAppearance.SELF_SIGNED);
sap.setReason("I'm the author");
sap.setLocation("Lisbon");
// comment next line to have an invisible signature
sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1,
null);
sap.setExternalDigest(new byte[2048], null, "RSA");
sap.preClose();
PdfPKCS7 sig = sap.getSigStandard().getSigner();
Signature sign = Signature.getInstance("SHA1withRSA");
sign.initSign(privateKey);
byte buf[] = new byte[8192];
int n;
java.io.InputStream inp = sap.getRangeStream();
while ((n = inp.read(buf)) > 0) {
sign.update(buf, 0, n);
}
sig.setExternalDigest(sign.sign(), null, "RSA");
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.CONTENTS, new
PdfString(sig.getEncodedPKCS1()).setHexWriting(true));
sap.close(dic);
} catch(Exception e) {
e.printStackTrace();
}
===========================================
java.lang.NullPointerException
at java.util.Calendar.setTime(Calendar.java:1070)
at
com.lowagie.text.pdf.PdfSignatureAppearance.getSignDate(PdfSignatureAppearance.java:841)
at
com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:992)
at
com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:920)
at Sign.main(Sign.java:96)
Any suggestion?
Best regards,
Eric
On Tue, Sep 22, 2009 at 5:45 PM, Eric Chow <eric...@gmail.com> wrote:
> Hello,
>
> Any Java iText experts that have a simple example to sign PDF with external
> signature approach?
>
> Please give me a hand and show me a simple example.
>
> Since I am new in iText, I can't totally understand the example of
> iTextSharp. It is better to show me a Java code, thank very much.
>
> Best regards,
> Eric
>
>
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