/*
 * 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.Checksum;
import sun.security.krb5.EncryptedData;
import sun.security.krb5.internal.*;

public class NullEType extends EType {

    public NullEType() {
    }

    public int eType() {
        return EncryptedData.ETYPE_NULL;
    }

    public int minimumPadSize() {
        return 0;
    }

    public int confounderSize() {
        return 0;
    }

    public int checksumType() {
        return Checksum.CKSUMTYPE_NULL;
    }

    public int checksumSize() {
        return 0;
    }

    public int blockSize() {
        return 1;
    }

    public int keyType() {
        return Krb5.KEYTYPE_NULL;
    }

    public int keySize() {
        return 0;
    }

    public byte[] encrypt(byte[] data, byte[] key, int usage) {
        byte[] cipher = new byte[data.length];
        System.arraycopy(data, 0, cipher, 0, data.length);
        return cipher;
    }

    public byte[] encrypt(byte[] data, byte[] key, byte[] ivec, int usage) {
        byte[] cipher = new byte[data.length];
        System.arraycopy(data, 0, cipher, 0, data.length);
        return cipher;
    }

    public byte[] decrypt(byte[] cipher, byte[] key, int usage)
        throws KrbApErrException {
            return cipher.clone();
    }

    public byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, int usage)
        throws KrbApErrException {
            return cipher.clone();
    }
}