如何使用itextsharp签名Pdf? [英] How can i sign a Pdf with itextsharp?

问题描述

大家好！

我正在尝试使用C#编程签名Pdf，但是我遇到了一些问题.
创建pdf时，我想签字，但文档完成后不签字.

有什么想法吗?.

感谢您的关注.

Hi guys!!

I''m trying to sign a Pdf Programatically with c#, but i''m having some problems.
When i''m creating the pdf i want to put my sign, but no when the document is already done.

Any idea??.

Thanks for your attention.

推荐答案

KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream("my_private_key.pfx"), "my_password".toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader("original.pdf");
FileOutputStream fout = new FileOutputStream("signed.pdf");
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_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);
stp.close()

如果您只是通过Google搜索"iTextSharp数字签名"，就很容易找到.
阅读 [ ^ ] ...

Easily found if you just Googled for "iTextSharp digital signature".

Read[^]...

感谢大家.

我看到了相同的示例，但我有点困惑.

与此相关的

KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream("my_private_key.pfx")，"my_password" .toCharArray());
字符串别名=(String)ks.aliases().nextElement();
私钥=(PrivateKey)ks.getKey(alias，"my_password" .toCharArray());
Certificate []链= ks.getCertificateChain(alias);

你能给我解释一下吗?
我不能使用KeyStore.使用哪个指令?

thanks all of you.

I saw the same example but i''m a bit confused.

Particullary with this

KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream("my_private_key.pfx"), "my_password".toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);

Can you explain me a bit??
I can''t use KeyStore. Which directive is using??

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