/*

 * Copyright (c) 2004, 2005, 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

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package sun.security.krb5.internal.crypto;

import sun.security.krb5.internal.crypto.dk.AesDkCrypto;

import sun.security.krb5.KrbCryptoException;

import java.security.GeneralSecurityException;

/**

 * Class with static methods for doing AES operations.

 *

 * @author Seema Malkani

 */

public class Aes256 {

    private static final AesDkCrypto CRYPTO = new AesDkCrypto(256);

    private Aes256() {

    }

    public static byte[] stringToKey(char[] password, String salt, byte[] params)

        throws GeneralSecurityException {

        return CRYPTO.stringToKey(password, salt, params);

    }

    // in bytes

    public static int getChecksumLength() {

        return CRYPTO.getChecksumLength();

    }

    public static byte[] calculateChecksum(byte[] baseKey, int usage,

        byte[] input, int start, int len) throws GeneralSecurityException {

            return CRYPTO.calculateChecksum(baseKey, usage, input, start, len);

    }

    public static byte[] encrypt(byte[] baseKey, int usage,

        byte[] ivec, byte[] plaintext, int start, int len)

        throws GeneralSecurityException, KrbCryptoException {

            return CRYPTO.encrypt(baseKey, usage, ivec, null /* new_ivec */,

                plaintext, start, len);

    }

    /* Encrypt plaintext; do not add confounder, padding, or checksum */

    public static byte[] encryptRaw(byte[] baseKey, int usage,

        byte[] ivec, byte[] plaintext, int start, int len)

        throws GeneralSecurityException, KrbCryptoException {

        return CRYPTO.encryptRaw(baseKey, usage, ivec, plaintext, start, len);

    }

    public static byte[] decrypt(byte[] baseKey, int usage, byte[] ivec,

        byte[] ciphertext, int start, int len)

        throws GeneralSecurityException {

        return CRYPTO.decrypt(baseKey, usage, ivec, ciphertext, start, len);

    }

    /*

     * Decrypt ciphertext; do not remove confounder, padding, or check

     * checksum

     */

    public static byte[] decryptRaw(byte[] baseKey, int usage, byte[] ivec,

        byte[] ciphertext, int start, int len)

        throws GeneralSecurityException {

        return CRYPTO.decryptRaw(baseKey, usage, ivec, ciphertext, start, len);

    }

};