如何在 Java 中提取 X509 证书字段 [英] How to extract X509 Certificate fields in Java

问题描述

我目前正在开发一个应用程序，该应用程序将处理 X509 证书的某些字段，但我似乎无法弄清楚如何提取证书的某些部分以进行调试.到目前为止，我只能使用以下代码弄清楚如何从基于 java.security.cert.Certificate 的 Javadoc 的文件中读取证书:

I am currently working on an application that will process certain fields of a X509 Certificate, and I cannot seem to figure out how to extract certain parts of the certificate for debugging purposes. So far I have only been able to figure out how to read a certificate from a file based on the Javadoc for java.security.cert.Certificate, using this code:

FileInputStream fis = new FileInputStream(filename);
BufferedInputStream bis = new BufferedInputStream(fis);

CertificateFactory cf = CertificateFactory.getInstance("X.509");
while (bis.available() > 0) {
    Certificate cert = cf.generateCertificate(bis);
System.out.println(cert.toString());
}

假设没有抛出异常，并且该证书是有效证书，我该怎么做?

Assuming that no exceptions are thrown, and that cert is a valid certificate, how would I do this?

旁注我在这个项目中使用了 Bouncy Castle

Sidenote I am using Bouncy Castle in this project

推荐答案

Cast it to an X509Certificate:

Cast it to an X509Certificate:

X509Certificate cert = (X509Certificate) cf.generateCertificate(bis);
System.out.println(cert.getSubjectDN());

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