/*

 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.jgss.wrapper;

import java.util.Hashtable;

import org.ietf.jgss.Oid;

import org.ietf.jgss.GSSName;

import org.ietf.jgss.ChannelBinding;

import org.ietf.jgss.MessageProp;

import org.ietf.jgss.GSSException;

import sun.security.jgss.GSSUtil;

/**

 * This class is essentially a JNI calling stub for all wrapper classes.

 *

 * @author Valerie Peng

 * @since 1.6

 */

class GSSLibStub {

    private Oid mech;

    private long pMech;

    /**

     * Initialization routine to dynamically load function pointers.

     *

     * @param lib library name to dlopen

     * @param debug set to true for reporting native debugging info

     * @return true if succeeded, false otherwise.

     */

    static native boolean init(String lib, boolean debug);

    private static native long getMechPtr(byte[] oidDerEncoding);

    // Miscellaneous routines

    static native Oid[] indicateMechs();

    native Oid[] inquireNamesForMech() throws GSSException;

    // Name related routines

    native void releaseName(long pName);

    native long importName(byte[] name, Oid type);

    native boolean compareName(long pName1, long pName2);

    native long canonicalizeName(long pName);

    native byte[] exportName(long pName) throws GSSException;

    native Object[] displayName(long pName) throws GSSException;

    // Credential related routines

    native long acquireCred(long pName, int lifetime, int usage)

                                        throws GSSException;

    native long releaseCred(long pCred);

    native long getCredName(long pCred);

    native int getCredTime(long pCred);

    native int getCredUsage(long pCred);

    // Context related routines

    native NativeGSSContext importContext(byte[] interProcToken);

    native byte[] initContext(long pCred, long targetName, ChannelBinding cb,

                              byte[] inToken, NativeGSSContext context);

    native byte[] acceptContext(long pCred, ChannelBinding cb,

                                byte[] inToken, NativeGSSContext context);

    native long[] inquireContext(long pContext);

    native Oid getContextMech(long pContext);

    native long getContextName(long pContext, boolean isSrc);

    native int getContextTime(long pContext);

    native long deleteContext(long pContext);

    native int wrapSizeLimit(long pContext, int flags, int qop, int outSize);

    native byte[] exportContext(long pContext);

    native byte[] getMic(long pContext, int qop, byte[] msg);

    native void verifyMic(long pContext, byte[] token, byte[] msg,

                          MessageProp prop) ;

    native byte[] wrap(long pContext, byte[] msg, MessageProp prop);

    native byte[] unwrap(long pContext, byte[] msgToken, MessageProp prop);

    private static Hashtable<Oid, GSSLibStub>

        table = new Hashtable<Oid, GSSLibStub>(5);

    static GSSLibStub getInstance(Oid mech) throws GSSException {

        GSSLibStub s = table.get(mech);

        if (s == null) {

            s = new GSSLibStub(mech);

            table.put(mech, s);

        }

        return s;

    }

    private GSSLibStub(Oid mech) throws GSSException {

        SunNativeProvider.debug("Created GSSLibStub for mech " + mech);

        this.mech = mech;

        this.pMech = getMechPtr(mech.getDER());

    }

    public boolean equals(Object obj) {

        if (obj == this) return true;

        if (!(obj instanceof GSSLibStub)) {

            return false;

        }

        return (mech.equals(((GSSLibStub) obj).getMech()));

    }

    public int hashCode() {

        return mech.hashCode();

    }

    Oid getMech() {

        return mech;

    }

}