Java Tutorial/Security/Principal

Principal and Certificate

   <source lang="java">

import java.io.FileInputStream; import java.security.Principal; import java.security.cert.Certificate; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; public class MainClass {

 public static void main(String args[]) throws Exception {
   Certificate[] certpath = new Certificate[args.length];
   CertificateFactory cf = CertificateFactory.getInstance("X.509");
   for (int i = 0; i < args.length; i++) {
     FileInputStream in = new FileInputStream(args[i]);
     certpath[i] = cf.generateCertificate(in);
   }
   for (int i = 0; i < certpath.length - 1; i++) {
     Principal issuer = ((X509Certificate) certpath[i]).getIssuerDN();
     Principal subject = ((X509Certificate) certpath[i + 1]).getSubjectDN();
     if (!issuer.equals(subject)) {
       System.out.println("in " + i + " issuer is " + issuer);
       System.out.println("But in " + (i + 1));
       System.out.println("subject is " + subject);
       break;
     }
   }
 }

}</source>