Hi,
I am having some problems using itext api in PDF for the digital
signature.
1) I am using the below code to sign the PDF digitally. After adding the
signature it showing that the signature as "Validity Unknown".
how to currect this one ?
2) And how to validate the signature, whether signature from currect person
or not?
3) i having a requirement in that 1st person will sign after that next
person will edit that pdf and he also sign that pdf. how to verify in this
case?
My code>>>>>>>>>>>>
File outputFile= null;
PdfStamper pdfStamper = null;
PdfSignatureAppearance sap=null;
try{
PrivateKey key = null;
Certificate[] chain = null;
if (!keystore.exists())
return false;
if (reason != null)
{
KeyStore ks = KeyStore.getInstance(keystoreType);
FileInputStream fis = new FileInputStream(keystore);
try
{
ks.load(fis, keystorePassword);
fis.close();
}
finally { fis.close(); }
String alias = (String) ks.aliases().nextElement();
key = (PrivateKey) ks.getKey(alias, privateKeyPassword);
chain = ks.getCertificateChain(alias);
}
PdfReader pdfReader = new PdfReader(srcFileName);
int n = pdfReader.getNumberOfPages();
outputFile = new File(pdfOutfile);
pdfStamper = PdfStamper.createSignature(pdfReader, null, '\0',
outputFile);
sap = pdfStamper.getSignatureAppearance();
sap.setCrypto(key, chain, null,
PdfSignatureAppearance.SELF_SIGNED);
sap.setVisibleSignature(new Rectangle(700, 100, 350, 190), 1, null);
sap.setReason(reason);
sap.setLocation(location);
sap.setCertified(false);
if (userPassword != null)
pdfStamper.setEncryption(true, userPassword, ownerPassword,
PdfWriter.AllowPrinting | PdfWriter.AllowCopy | PdfWriter.AllowScreenReaders|
PdfWriter.AllowDegradedPrinting);
pdfStamper.setFormFlattening(true);
HashMap moreInfo = new HashMap();
moreInfo.put("Author", ""+userName);
pdfStamper.setMoreInfo(moreInfo);
int i = 0;
PdfContentByte over;
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.WINANSI, BaseFont.NOT_EMBEDDED);
while (i < n) {
i++;
over = pdfStamper.getOverContent(i);
over.beginText();
over.setFontAndSize(bf, 18);
over.setTextMatrix(30, 30);
over.setFontAndSize(bf, 12);
over.setFontAndSize(bf, 14);
over.showTextAligned(Element.ALIGN_LEFT, ""+userName, 400, 130,
0);
over.endText();
----------------------------
Please clarify my doubts.And it is greate if you give the code for these
functionality i am new to this Digital signature...
Thanks & Regards,
Prashanth
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