Java Tutorial/Security/JKS

JKS keystore: get certificate chain

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.cert.CertPath;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.List;
public class MainClass {
  public static void main(String args[]) throws Exception {
    String storename = args[0];
    char[] storepass = args[1].toCharArray();
    String alias = args[2];
    KeyStore ks = KeyStore.getInstance("JKS");
    ks.load(new FileInputStream(storename), storepass);
    java.security.cert.Certificate[] cchain = ks.getCertificateChain(alias);
    List mylist = new ArrayList();
    for (int i = 0; i < cchain.length; i++) {
      mylist.add(cchain[i]);
    }
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    CertPath cp = cf.generateCertPath(mylist);
    System.out.println(cp);
  }
}

JKS: List aliases

import java.io.FileInputStream;
import java.security.KeyStore;
import java.util.Enumeration;
public class MainClass {
  public static void main(String args[]) throws Exception {
    String pass = "wshr.ut";
    String name = "mykeystore";
    FileInputStream in = new FileInputStream(name);
    KeyStore ks = KeyStore.getInstance("JKS");
    ks.load(in, pass.toCharArray());
    Enumeration e = ks.aliases();
    while (e.hasMoreElements()) {
      System.out.println(e.nextElement());
    }
  }
}

Use JKS

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.cert.Certificate;
public class MainClass {
  public static void main(String args[]) throws Exception {
    String pass = "wshr.ut";
    String alias = "mytest";
    String name = "mykeystore";
    FileInputStream in = new FileInputStream(name);
    KeyStore ks = KeyStore.getInstance("JKS");
    ks.load(in, pass.toCharArray());
    Certificate c = ks.getCertificate(alias);
    in.close();
    System.out.println(c);
  }
}

Use JKS KeyStore to load key

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.KeyStore;
public class MainClass {
  public static void main(String args[]) throws Exception {
    char[] oldpass = args[0].toCharArray();
    char[] newpass = args[1].toCharArray();
    String name = "mykeystore";
    FileInputStream in = new FileInputStream(name);
    KeyStore ks = KeyStore.getInstance("JKS");
    ks.load(in, oldpass);
    in.close();
    FileOutputStream output = new FileOutputStream(name);
    ks.store(output, newpass);
    output.close();
  }
}