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;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.hbase.HBaseConfiguration;
022import org.apache.hadoop.hbase.io.crypto.aes.AES;
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * The default cipher provider. Supports AES via the JCE.
027 */
028@InterfaceAudience.Public
029public final class DefaultCipherProvider implements CipherProvider {
030
031  private static DefaultCipherProvider instance;
032
033  public static DefaultCipherProvider getInstance() {
034    if (instance != null) {
035      return instance;
036    }
037    instance = new DefaultCipherProvider();
038    return instance;
039  }
040
041  private Configuration conf = HBaseConfiguration.create();
042
043  // Prevent instantiation
044  private DefaultCipherProvider() {
045  }
046
047  @Override
048  public Configuration getConf() {
049    return conf;
050  }
051
052  @Override
053  public void setConf(Configuration conf) {
054    this.conf = conf;
055  }
056
057  @Override
058  public String getName() {
059    return "default";
060  }
061
062  @Override
063  public Cipher getCipher(String name) {
064    if (name.equalsIgnoreCase("AES")) {
065      return new AES(this);
066    }
067    throw new RuntimeException(
068      "Cipher '" + name + "' is not supported by provider '" + getName() + "'");
069  }
070
071  @Override
072  public String[] getSupportedCiphers() {
073    return new String[] { "AES" };
074  }
075
076}