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/* CertificateUtils.java
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Copyright (C) 2010 Red Hat, Inc.
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This file is part of IcedTea.
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IcedTea is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as published by
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the Free Software Foundation, version 2.
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IcedTea is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with IcedTea; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version.
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package net.sourceforge.jnlp.security;
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import java.io.BufferedInputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.PrintStream;
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import java.math.BigInteger;
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import java.security.KeyStore;
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import java.security.KeyStoreException;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.util.Random;
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import net.sourceforge.jnlp.runtime.JNLPRuntime;
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import sun.misc.BASE64Encoder;
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import sun.security.provider.X509Factory;
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* Common utilities to manipulate certificates. Provides methods to add
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* Certificates to a KeyStores, check if certificates already exist in a
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* KeyStore and printing certificates.
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public class CertificateUtils {
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* Adds the X509Certficate in the file to the KeyStore. Note that it does
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* not update the copy of the KeyStore on disk.
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public static final void addToKeyStore(File file, KeyStore ks) throws CertificateException,
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IOException, KeyStoreException {
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if (JNLPRuntime.isDebug()) {
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System.out.println("Importing certificate from " + file + " into " + ks);
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BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
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CertificateFactory cf = CertificateFactory.getInstance("X509");
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X509Certificate cert = null;
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cert = (X509Certificate) cf.generateCertificate(bis);
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} catch (ClassCastException cce) {
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throw new CertificateException("Input file is not an X509 Certificate", cce);
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addToKeyStore(cert, ks);
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* Adds an X509Certificate to the KeyStore. Note that it does not update the
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* copy of the KeyStore on disk.
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public static final void addToKeyStore(X509Certificate cert, KeyStore ks)
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throws KeyStoreException {
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if (JNLPRuntime.isDebug()) {
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System.out.println("Importing " + cert.getSubjectX500Principal().getName());
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// does this certificate already exist?
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alias = ks.getCertificateAlias(cert);
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// create a unique alias for this new certificate
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Random random = new Random();
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alias = new BigInteger(20, random).toString();
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} while (ks.getCertificate(alias) != null);
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ks.setCertificateEntry(alias, cert);
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* Checks whether an X509Certificate is already in one of the keystores
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* @param c the certificate
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* @param keyStores the KeyStores to check in
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* @return true if the certificate is present in one of the keystores, false otherwise
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public static final boolean inKeyStores(X509Certificate c, KeyStore[] keyStores) {
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for (int i = 0; i < keyStores.length; i++) {
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if (keyStores[i].getCertificateAlias(c) != null) {
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if (JNLPRuntime.isDebug()) {
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System.out.println(c.getSubjectX500Principal().getName() + " found in cacerts");
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} catch (KeyStoreException e) {
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* Writes the certificate in base64 encoded from to the print stream.
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* See http://tools.ietf.org/html/rfc4945#section-6.1 for more information
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public static void dump(Certificate cert, PrintStream out) throws IOException,
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CertificateException {
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BASE64Encoder encoder = new BASE64Encoder();
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out.println(X509Factory.BEGIN_CERT);
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encoder.encodeBuffer(cert.getEncoded(), out);
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out.println(X509Factory.END_CERT);
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netx/net/sourceforge/jnlp/security/CertificateUtils.java
