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or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.crypto.cipher;

import java.nio.ByteBuffer;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.ShortBufferException;

import org.apache.commons.crypto.utils.Utils;

This class represents a block cipher in one of its modes.
/**
 * This class represents a block cipher in one of its modes.
 */
abstract class OpenSslFeedbackCipher {

    protected long context = 0;
    protected final int algorithmMode;
    protected final int padding;

    protected int cipherMode = OpenSsl.DECRYPT_MODE;

    OpenSslFeedbackCipher(final long context, final int algorithmMode, final int padding) {
        this.context = context;
        this.algorithmMode = algorithmMode;
        this.padding = padding;
    }

    abstract void init(int mode, byte[] key, AlgorithmParameterSpec params)
            throws InvalidAlgorithmParameterException;

    abstract int update(ByteBuffer input, ByteBuffer output)
            throws ShortBufferException;

    abstract int update(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
            throws ShortBufferException;

    abstract int doFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
            throws ShortBufferException, IllegalBlockSizeException, BadPaddingException;

    abstract int doFinal(ByteBuffer input, ByteBuffer output) throws ShortBufferException,
            IllegalBlockSizeException, BadPaddingException;

    abstract void updateAAD(byte[] aad);

    public void clean() {
        if (context != 0) {
            OpenSslNative.clean(context);
            context = 0;
        }
    }

    public void checkState() {
        Utils.checkState(context != 0, "Cipher context is invalid.");
    }
}