/*

 * Copyright 2003-2007 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.crypto.provider;

import java.security.*;

import java.security.spec.*;

import javax.crypto.*;

import javax.crypto.spec.RC2ParameterSpec;

/**

 * JCE CipherSpi for the RC2(tm) algorithm as described in RFC 2268.

 * The real code is in CipherCore and RC2Crypt.

 *

 * @since   1.5

 * @author  Andreas Sterbenz

 */

public final class RC2Cipher extends CipherSpi {

    // internal CipherCore & RC2Crypt objects which do the real work.

    private final CipherCore core;

    private final RC2Crypt embeddedCipher;

    public RC2Cipher() {

        SunJCE.ensureIntegrity(getClass());

        embeddedCipher = new RC2Crypt();

        core = new CipherCore(embeddedCipher, 8);

    }

    protected void engineSetMode(String mode)

            throws NoSuchAlgorithmException {

        core.setMode(mode);

    }

    protected void engineSetPadding(String paddingScheme)

            throws NoSuchPaddingException {

        core.setPadding(paddingScheme);

    }

    protected int engineGetBlockSize() {

        return 8;

    }

    protected int engineGetOutputSize(int inputLen) {

        return core.getOutputSize(inputLen);

    }

    protected byte[] engineGetIV() {

        return core.getIV();

    }

    protected AlgorithmParameters engineGetParameters() {

        return core.getParameters("RC2");

    }

    protected void engineInit(int opmode, Key key, SecureRandom random)

            throws InvalidKeyException {

        embeddedCipher.initEffectiveKeyBits(0);

        core.init(opmode, key, random);

    }

    protected void engineInit(int opmode, Key key,

            AlgorithmParameterSpec params, SecureRandom random)

            throws InvalidKeyException, InvalidAlgorithmParameterException {

        if (params != null && params instanceof RC2ParameterSpec) {

            embeddedCipher.initEffectiveKeyBits

                (((RC2ParameterSpec)params).getEffectiveKeyBits());

        } else {

            embeddedCipher.initEffectiveKeyBits(0);

        }

        core.init(opmode, key, params, random);

    }

    protected void engineInit(int opmode, Key key,

            AlgorithmParameters params, SecureRandom random)

            throws InvalidKeyException, InvalidAlgorithmParameterException {

        if (params != null && params.getAlgorithm().equals("RC2")) {

            try {

                RC2ParameterSpec rc2Params = (RC2ParameterSpec)

                    params.getParameterSpec(RC2ParameterSpec.class);

                engineInit(opmode, key, rc2Params, random);

            } catch (InvalidParameterSpecException ipse) {

                throw new InvalidAlgorithmParameterException

                            ("Wrong parameter type: RC2 expected");

            }

        } else {

            embeddedCipher.initEffectiveKeyBits(0);

            core.init(opmode, key, params, random);

        }

    }

    protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) {

        return core.update(in, inOfs, inLen);

    }

    protected int engineUpdate(byte[] in, int inOfs, int inLen,

            byte[] out, int outOfs) throws ShortBufferException {

        return core.update(in, inOfs, inLen, out, outOfs);

    }

    protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen)

            throws IllegalBlockSizeException, BadPaddingException {

        return core.doFinal(in, inOfs, inLen);

    }

    protected int engineDoFinal(byte[] in, int inOfs, int inLen,

            byte[] out, int outOfs) throws IllegalBlockSizeException,

            ShortBufferException, BadPaddingException {

        return core.doFinal(in, inOfs, inLen, out, outOfs);

    }

    protected int engineGetKeySize(Key key) throws InvalidKeyException {

        byte[] keyBytes = CipherCore.getKeyBytes(key);

        RC2Crypt.checkKey(key.getAlgorithm(), keyBytes.length);

        return keyBytes.length << 3;

    }

    protected byte[] engineWrap(Key key)

            throws IllegalBlockSizeException, InvalidKeyException {

        return core.wrap(key);

    }

    protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm,

            int wrappedKeyType) throws InvalidKeyException,

            NoSuchAlgorithmException {

        return core.unwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType);

    }

}