/*

 * 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. 1999 All Rights Reserved.

 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.

 */

package sun.security.krb5.internal.crypto;

import sun.security.krb5.*;

import sun.security.krb5.internal.*;

public class Crc32CksumType extends CksumType {

    public Crc32CksumType() {

    }

    public int confounderSize() {

        return 0;

    }

    public int cksumType() {

        return Checksum.CKSUMTYPE_CRC32;

    }

    public boolean isKeyed() {

        return false;

    }

    public int cksumSize() {

        return 4;

    }

    public int keyType() {

        return Krb5.KEYTYPE_NULL;

    }

    public int keySize() {

        return 0;

    }

    public byte[] calculateChecksum(byte[] data, int size,

            byte[] key, int usage) {

        return crc32.byte2crc32sum_bytes(data, size);

    }

    public boolean verifyChecksum(byte[] data, int size,

            byte[] key, byte[] checksum, int usage) {

        return CksumType.isChecksumEqual(checksum,

                crc32.byte2crc32sum_bytes(data));

    }

    public static byte[] int2quad(long input) {

        byte[] output = new byte[4];

        for (int i = 0; i < 4; i++) {

            output[i] = (byte)((input >>> (i * 8)) & 0xff);

        }

        return output;

    }

    public static long bytes2long(byte[] input) {

        long result = 0;

        result |= (((long)input[0]) & 0xffL) << 24;

        result |= (((long)input[1]) & 0xffL) << 16;

        result |= (((long)input[2]) & 0xffL) << 8;

        result |= (((long)input[3]) & 0xffL);

        return result;

    }

}