OpenSslCommonMode.java

/*
* 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 javax.crypto.spec.IvParameterSpec;

/**
 * This class do the real work(Encryption/Decryption) for non-authenticated modes, such as CTR, CBC.
 * <p>
 * It will call the OpenSSL API to implement encryption/decryption
 * </p>
 */
final class OpenSslCommonMode extends AbstractOpenSslFeedbackCipher {

    OpenSslCommonMode(final long context, final int algorithmMode, final int padding) {
        super(context, algorithmMode, padding);
    }

    @Override
    public int doFinal(final byte[] input, final int inputOffset, final int inputLen, final byte[] output, final int outputOffset)
            throws ShortBufferException, IllegalBlockSizeException, BadPaddingException {
        checkState();
        final int outputLength = output.length;

        int len = OpenSslNative.updateByteArray(context, input, inputOffset, inputLen, output, outputOffset, outputLength - outputOffset);

        len += OpenSslNative.doFinalByteArray(context, output, outputOffset + len, outputLength - outputOffset - len);

        return len;
    }

    @Override
    public int doFinal(final ByteBuffer input, final ByteBuffer output) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException {
        checkState();

        int totalLen = 0;
        int len = OpenSslNative.update(context, input, input.position(), input.remaining(), output, output.position(), output.remaining());
        totalLen += len;

        input.position(input.limit());
        output.position(output.position() + len);

        len = OpenSslNative.doFinal(context, output, output.position(), output.remaining());
        totalLen += len;

        output.position(output.position() + len);

        return totalLen;
    }

    @Override
    public void init(final int mode, final byte[] key, final AlgorithmParameterSpec params) throws InvalidAlgorithmParameterException {
        this.cipherMode = mode;
        final byte[] iv;
        if (!(params instanceof IvParameterSpec)) {
            // other AlgorithmParameterSpec is not supported now.
            throw new InvalidAlgorithmParameterException("Illegal parameters");
        }
        iv = ((IvParameterSpec) params).getIV();
        context = OpenSslNative.init(context, mode, algorithmMode, padding, key, iv);
    }

    @Override
    public int update(final byte[] input, final int inputOffset, final int inputLen, final byte[] output, final int outputOffset) throws ShortBufferException {
        checkState();

        return OpenSslNative.updateByteArray(context, input, inputOffset, inputLen, output, outputOffset, output.length - outputOffset);
    }

    @Override
    public int update(final ByteBuffer input, final ByteBuffer output) throws ShortBufferException {
        checkState();

        final int len = OpenSslNative.update(context, input, input.position(), input.remaining(), output, output.position(), output.remaining());
        input.position(input.limit());
        output.position(output.position() + len);

        return len;
    }

    @Override
    public void updateAAD(final byte[] aad) {
        throw new UnsupportedOperationException("The underlying Cipher implementation does not support this method");
    }
}