/*

 * Copyright (c) 1998, 2011, 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 com.sun.crypto.provider;

import java.io.*;

import java.security.AlgorithmParametersSpi;

import java.security.spec.AlgorithmParameterSpec;

import java.security.spec.InvalidParameterSpecException;

/**

 * This class implements the parameter (IV) used with the DES algorithm in

 * feedback-mode. IV is defined in the standards as follows:

 *

 * <pre>

 * IV ::= OCTET STRING  -- 8 octets

 * </pre>

 *

 * @author Jan Luehe

 *

 */

public final class DESParameters extends AlgorithmParametersSpi {

    private BlockCipherParamsCore core;

    public DESParameters() {

        core = new BlockCipherParamsCore(DESConstants.DES_BLOCK_SIZE);

    }

    protected void engineInit(AlgorithmParameterSpec paramSpec)

        throws InvalidParameterSpecException {

        core.init(paramSpec);

    }

    protected void engineInit(byte[] encoded)

        throws IOException {

        core.init(encoded);

    }

    protected void engineInit(byte[] encoded, String decodingMethod)

        throws IOException {

        core.init(encoded, decodingMethod);

    }

    protected <T extends AlgorithmParameterSpec>

        T engineGetParameterSpec(Class<T> paramSpec)

        throws InvalidParameterSpecException {

        if (AlgorithmParameterSpec.class.isAssignableFrom(paramSpec)) {

            return core.getParameterSpec(paramSpec);

        } else {

            throw new InvalidParameterSpecException

                ("Inappropriate parameter Specification");

        }

    }

    protected byte[] engineGetEncoded() throws IOException {

        return core.getEncoded();

    }

    protected byte[] engineGetEncoded(String encodingMethod)

        throws IOException {

        return core.getEncoded();

    }

    protected String engineToString() {

        return core.toString();

    }

}