/*

 * Copyright (c) 2013, 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.

 */

/*

 * (C) Copyright IBM Corp. 2013

 */

package com.sun.crypto.provider;

/**

 * This class represents the GHASH function defined in NIST 800-38D

 * under section 6.4. It needs to be constructed w/ a hash subkey, i.e.

 * block H. Given input of 128-bit blocks, it will process and output

 * a 128-bit block.

 *

 * <p>This function is used in the implementation of GCM mode.

 *

 * @since 1.8

 */

final class GHASH {

    }

        }

    }

            // Zi+1 = Zi if bit i of x is 0

        }

        // calculate Z128

    }

    // hash subkey H; should not change after the object has been constructed

    // buffer for storing hash

    // variables for save/restore calls

    /**

     * Initializes the cipher in the specified mode with the given key

     * and iv.

     *

     * @param subkeyH the hash subkey

     *

     * @exception ProviderException if the given key is inappropriate for

     * initializing this digest

     */

    GHASH(byte[] subkeyH) throws ProviderException {

        if ((subkeyH == null) || subkeyH.length != AES_BLOCK_SIZE) {

            throw new ProviderException("Internal error");

        }

    }

    /**

     * Resets the GHASH object to its original state, i.e. blank w/

     * the same subkey H. Used after digest() is called and to re-use

     * this object for different data w/ the same H.

     */

    void reset() {

    }

    /**

     * Save the current snapshot of this GHASH object.

     */

    void save() {

    }

    /**

     * Restores this object using the saved snapshot.

     */

    void restore() {

    }

    private void processBlock(byte[] data, int ofs) {

        if (data.length - ofs < AES_BLOCK_SIZE) {

            throw new RuntimeException("need complete block");

        }

    }

    void update(byte[] in) {

        update(in, 0, in.length);

    }

    void update(byte[] in, int inOfs, int inLen) {

        if (inLen - inOfs > in.length) {

            throw new RuntimeException("input length out of bound");

        }

        if (inLen % AES_BLOCK_SIZE != 0) {

            throw new RuntimeException("input length unsupported");

        }

        for (int i = inOfs; i < (inOfs + inLen); i += AES_BLOCK_SIZE) {

            processBlock(in, i);

        }

    }

    byte[] digest() {

    }

}