Java Tutorial/Security/PublicKey

Certificate and PublicKey

   <source lang="java">

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

 public static void main(String args[]) throws Exception {
   Certificate[] certpath = new Certificate[args.length - 1];
   CertificateFactory cf = CertificateFactory.getInstance("X.509");
   int i;
   for (i = 0; i < args.length - 1; i++) {
     FileInputStream in = new FileInputStream(args[i]);
     certpath[i] = cf.generateCertificate(in);
   }
   FileInputStream in = new FileInputStream(args[i]);
   Certificate trust = cf.generateCertificate(in);
   boolean pass = false;
   String reason = "";
   for (i = 0; i < certpath.length; i++) {
     try {
       PublicKey pbk;
       if (i == certpath.length - 1) {
         pbk = trust.getPublicKey();
       } else {
         pbk = certpath[i + 1].getPublicKey();
       }
       certpath[i].verify(pbk);
       pass = true;
     } catch (Exception e) {
       pass = false;
       reason += i + "  " + e.toString();
       break;
     }
   }
   System.out.println(pass);
 }

}</source>