/*
 * Copyright 1996-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package sun.security.provider;

import java.util.*;
import java.security.*;

import sun.security.action.PutAllAction;

import sun.security.rsa.SunRsaSignEntries;

/**
 * Provider used for verification of signed JAR files *if* the Sun and
 * SunRsaSign main classes have been removed. Otherwise, this provider is not
 * necessary and registers no algorithms. This functionality only exists to
 * support a use case required by a specific customer and is not generally
 * supported.
 *
 * @since  1.7
 * @author Andreas Sterbenz
 */
public final class VerificationProvider extends Provider {

    private static final long serialVersionUID = 7482667077568930381L;

    private static final boolean ACTIVE;

    static {
        boolean b;
        try {
            Class.forName("sun.security.provider.Sun");
            Class.forName("sun.security.rsa.SunRsaSign");
            b = false;
        } catch (ClassNotFoundException e) {
            b = true;
        }
        ACTIVE = b;
    }

    public VerificationProvider() {
        super("SunJarVerification", 1.7, "Jar Verification Provider");
        // register all algorithms normally registered by the Sun and SunRsaSign
        // providers, but only if they are missing
        if (ACTIVE == false) {
            return;
        }

        // if there is no security manager installed, put directly into
        // the provider. Otherwise, create a temporary map and use a
        // doPrivileged() call at the end to transfer the contents
        if (System.getSecurityManager() == null) {
            SunEntries.putEntries(this);
            SunRsaSignEntries.putEntries(this);
        } else {
            // use LinkedHashMap to preserve the order of the PRNGs
            Map<Object, Object> map = new LinkedHashMap<Object, Object>();
            SunEntries.putEntries(map);
            SunRsaSignEntries.putEntries(map);
            AccessController.doPrivileged(new PutAllAction(this, map));
        }
    }

}