/*

 * 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.KrbCryptoException;

import sun.security.krb5.internal.*;

public class DesCbcCrcEType extends DesCbcEType {

    public DesCbcCrcEType() {

    }

    public int eType() {

        return EncryptedData.ETYPE_DES_CBC_CRC;

    }

    public int minimumPadSize() {

        return 4;

    }

    public int confounderSize() {

        return 8;

    }

    public int checksumType() {

        return Checksum.CKSUMTYPE_RSA_MD5;

    }

    public int checksumSize() {

        return 4;

    }

    /**

     * Encrypts data using DES in CBC mode with CRC32.

     * @param data the data to be encrypted.

     * @param key  the secret key to encrypt the data. It is also used as initialization vector during cipher block chaining.

     * @return the buffer for cipher text.

     *

     * @written by Yanni Zhang, Dec 10, 1999

     */

    public byte[] encrypt(byte[] data, byte[] key, int usage)

         throws KrbCryptoException {

        return encrypt(data, key, key, usage);

    }

    /**

     * Decrypts data with provided key using DES in CBC mode with CRC32.

     * @param cipher the cipher text to be decrypted.

     * @param key  the secret key to decrypt the data.

     *

     * @written by Yanni Zhang, Dec 10, 1999

     */

    public byte[] decrypt(byte[] cipher, byte[] key, int usage)

         throws KrbApErrException, KrbCryptoException{

        return decrypt(cipher, key, key, usage);

    }

    protected byte[] calculateChecksum(byte[] data, int size) {

        return crc32.byte2crc32sum_bytes(data, size);

    }

}