001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io.crypto.aes;
019
020import java.io.IOException;
021import java.io.InputStream;
022import java.security.Key;
023import java.util.Properties;
024import javax.crypto.spec.IvParameterSpec;
025
026import org.apache.commons.crypto.stream.CryptoInputStream;
027import org.apache.hadoop.hbase.io.crypto.Decryptor;
028import org.apache.yetus.audience.InterfaceAudience;
029import org.apache.yetus.audience.InterfaceStability;
030
031import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
032
033@InterfaceAudience.Private
034@InterfaceStability.Evolving
035public class CommonsCryptoAESDecryptor implements Decryptor {
036
037  private String cipherMode;
038  private Properties properties;
039  private Key key;
040  private byte[] iv;
041
042  public CommonsCryptoAESDecryptor(String cipherMode, Properties properties) {
043    this.cipherMode = cipherMode;
044    this.properties = properties;
045  }
046
047  @Override
048  public void setKey(Key key) {
049    Preconditions.checkNotNull(key, "Key cannot be null");
050    this.key = key;
051  }
052
053  @Override
054  public int getIvLength() {
055    return CommonsCryptoAES.IV_LENGTH;
056  }
057
058  @Override
059  public int getBlockSize() {
060    return CommonsCryptoAES.BLOCK_SIZE;
061  }
062
063  @Override
064  public void setIv(byte[] iv) {
065    Preconditions.checkNotNull(iv, "IV cannot be null");
066    Preconditions.checkArgument(iv.length == CommonsCryptoAES.IV_LENGTH, "Invalid IV length");
067    this.iv = iv;
068  }
069
070  @Override
071  public InputStream createDecryptionStream(InputStream in) {
072    try {
073      return new CryptoInputStream(cipherMode, properties, in, key, new
074          IvParameterSpec(iv));
075    } catch (IOException e) {
076      throw new RuntimeException(e);
077    }
078  }
079
080  @Override
081  public void reset() {
082  }
083}