使用SSL证书签署PDF文件 [英] Using SSL certificate for signing PDF files

问题描述

我的应用程序有SSL证书，我想用它来使用iText对PDF文件进行数字签名。证书的扩展名为.cer，由证书签名机构（CA）提供。

I have a SSL certificate for my application and I want to use it for digitally signing PDF files using iText. The extension of the certificate is .cer and is provided by a certificate signing authority (CA).

问题是我无法将此.cer证书转换为使用itext库签名PDF时所需的java密钥库。我的代码是：

The problem is that I am not able to convert this .cer certificate into java keystore which is required while signing the PDF using itext library. The code that I have is:

此代码显然会抛出无效的密钥库格式IOException。

KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(new FileInputStream("C:\\abc.cer"), "abcd".toCharArray());
String alias = (String) ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias, "abcd".toCharArray());
java.security.cert.Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader("C:\\test.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.WINCER_SIGNED);
sap.setReason("Test Reason");
sap.setLocation("Test Location");
sap.setVisibleSignature(new Rectangle(10, 10, 20, 20), 1, null);
stp.close();

请告诉我如何将SSL证书转换为java密钥库并用它来签署pdf文件。

Please let me know how can i convert a SSL certificate into a java keystore and use it for signing pdf files.

推荐答案

首先，证书不是SSL证书。它们是x.509证书，其中一些可用于SSL / TLS身份验证。如果您有此类证书，则不能将其用于其他目的，包括PDF签名。

First, certificates are not "SSL certificates". They are x.509 certificates, some of which can be used for SSL/TLS authentication. If you have such certificate, you can't use it for other purposes including PDF signing.

接下来，.cer文件是证书的公共部分，它不会包括私钥。您需要证书和私钥才能签署任何内容。

Next, .cer file is a public part of the certificate, it doesn't include a private key. You need a certificate and a private key to sign anything.

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