如何使用iText使用XFA表单对PDF文件进行数字签名 [英] How to digitally sign PDF files with XFA forms using iText

问题描述

iText发行说明提到，iText版本5.4.2和5.4.3支持使用XFA表单签署PDF：

iText release notes mention that signing of PDFs with XFA forms is supported from iText versions 5.4.2 and 5.4.3:

http://itextpdf.com/history/?branch=54&node=542

http://itextpdf.com/history/？ branch = 54& node = 543

在某处有文档如何使用Java进行签名？

Is there a documentation somewhere how to do the signing in Java?

我特别感兴趣的是用XFA签名PDF，其中有一个准备好的签名字段。

I am specifically interested in signing PDFs with XFA where there is a prepared field for signature.

推荐答案

这是一个显示如何使用XmlDSig签名的小例子：

This is a small example showing how to sign using XmlDSig:

PdfReader reader =new  PdfReader(src);
FileOutputStream os =new  FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createXmlSignature(reader, os);
XmlSignatureAppearance appearance = stamper.getXmlSignatureAppearance();
appearance.setXmlLocator(new  XfaXmlLocator(stamper));
appearance.setXpathConstructor(new XfaXpathConstructor(XfaXpathConstructor.XdpPackage.Datasets));
ExternalSignature signature =new  PrivateKeySignature(pk, digestAlgorithm,"BC");
//use signXmlDSig or signXades
MakeXmlSignature.signXmlDSig(appearance, signature, chain);

您也可以使用XAdES进行签名，但之后您将无法在Adobe中验证签名软件，因为我不认为Adobe已经支持XAdES（如果我错了，请纠正我）。

You can also sign using XAdES, but then you won't be able to validate the signature in Adobe software because I don't think Adobe already supports XAdES (please correct me if I'm wrong).

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