org.apache.hadoop.hbase.io.crypto.aes.CommonsCryptoAESEncryptor.java Source code

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Here is the source code for org.apache.hadoop.hbase.io.crypto.aes.CommonsCryptoAESEncryptor.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.hbase.io.crypto.aes;

import com.google.common.base.Preconditions;
import org.apache.commons.crypto.stream.CryptoOutputStream;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.io.crypto.Encryptor;

import javax.crypto.spec.IvParameterSpec;
import java.io.IOException;
import java.io.OutputStream;
import java.security.Key;
import java.security.SecureRandom;
import java.util.Properties;

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class CommonsCryptoAESEncryptor implements Encryptor {

    private String cipherMode;
    private Properties properties;
    private Key key;
    private byte[] iv;
    private boolean initialized = false;
    private SecureRandom rng;

    public CommonsCryptoAESEncryptor(String cipherMode, Properties properties, SecureRandom rng) {
        this.cipherMode = cipherMode;
        this.properties = properties;
        this.rng = rng;
    }

    @Override
    public void setKey(Key key) {
        this.key = key;
    }

    @Override
    public int getIvLength() {
        return CommonsCryptoAES.IV_LENGTH;
    }

    @Override
    public int getBlockSize() {
        return CommonsCryptoAES.BLOCK_SIZE;
    }

    @Override
    public byte[] getIv() {
        return iv;
    }

    @Override
    public void setIv(byte[] iv) {
        Preconditions.checkNotNull(iv, "IV cannot be null");
        Preconditions.checkArgument(iv.length == CommonsCryptoAES.IV_LENGTH, "Invalid IV length");
        this.iv = iv;
    }

    @Override
    public OutputStream createEncryptionStream(OutputStream out) {
        if (!initialized) {
            reset();
        }
        try {
            return new CryptoOutputStream(cipherMode, properties, out, key, new IvParameterSpec(iv));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void reset() {
        if (iv == null) {
            iv = new byte[getIvLength()];
            rng.nextBytes(iv);
        }
        initialized = true;
    }
}