org.apache.hadoop.io.crypto.aes.NativeOpensslAESCipher.java Source code

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Here is the source code for org.apache.hadoop.io.crypto.aes.NativeOpensslAESCipher.java

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/**
 * 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.hadoop.io.crypto.aes;

import java.nio.ByteBuffer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.crypto.NativeCodeLoader;

final public class NativeOpensslAESCipher implements AESCipher {
    private static final Log LOG = LogFactory.getLog(NativeOpensslAESCipher.class.getName());

    private static boolean nativeCryptoLoaded = false;

    static {
        if (NativeCodeLoader.isNativeCodeLoaded() && NativeCodeLoader.buildSupportsCrypto()) {
            try {
                nativeCryptoLoaded = true;
            } catch (Throwable t) {
                LOG.error("failed to load AESEncryptor", t);
            }
        }
    }

    public static boolean isNativeCodeLoaded() {
        return nativeCryptoLoaded;
    }

    private long context = 0;
    private boolean inited = false;

    private native long init(int mode, byte[] key, byte[] iv);

    private native void reset(long context, byte[] key, byte[] iv);

    private native void cleanup(long context);

    private native int doFinal(long context, ByteBuffer input, int inputLength, ByteBuffer output);

    /**
     * Initialize the AESCipher. This method only needs to call once
     * 
     * @param mode
     * @param key
     * @param iv
     */
    @Override
    public void init(Mode mode, byte[] key, byte[] iv) {
        context = init(mode.value(), key, iv);
        inited = true;
    }

    @Override
    public void reset() {
        reset(null, null);
    }

    @Override
    public void reset(byte[] key, byte[] iv) {
        if (!inited) {
            return;
        }
        reset(context, key, iv);
    }

    /**
     * input and output are direct buffer for speed improvement.
     * 
     * @param input
     * @param inputLength
     * @param output
     * @return the output length
     * @throws Exception when error happens
     */
    @Override
    public int doFinal(ByteBuffer input, int inputLength, ByteBuffer output) throws Exception {
        if (!inited) {
            throw new Exception("Cipher not inited, please call init()");
        }
        output.clear();
        output.limit(0);
        int length = doFinal(context, input, inputLength, output);
        if (0 == length) {
            throw new Exception("Decompressed length is 0!!!");
        }
        output.limit(length);
        return length;
    }

    /**
     * Cleanup the AESCipher. This method only needs to call once
     * 
     * @throws Exception
     */
    @Override
    public void cleanup() throws Exception {
        if (inited) {
            cleanup(context);
            inited = false;
        }
    }

    protected void finalize() throws Throwable {
        cleanup();
    }
}