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  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "MS_EXPOSE_REP",
034      justification = "singleton pattern")
035  public static DefaultCipherProvider getInstance() {
036    if (instance != null) {
037      return instance;
038    }
039    instance = new DefaultCipherProvider();
040    return instance;
041  }
042
043  private Configuration conf = HBaseConfiguration.create();
044
045  // Prevent instantiation
046  private DefaultCipherProvider() {
047  }
048
049  @Override
050  public Configuration getConf() {
051    return conf;
052  }
053
054  @Override
055  public void setConf(Configuration conf) {
056    this.conf = conf;
057  }
058
059  @Override
060  public String getName() {
061    return "default";
062  }
063
064  @Override
065  public Cipher getCipher(String name) {
066    if (name.equalsIgnoreCase("AES")) {
067      return new AES(this);
068    }
069    throw new RuntimeException(
070      "Cipher '" + name + "' is not supported by provider '" + getName() + "'");
071  }
072
073  @Override
074  public String[] getSupportedCiphers() {
075    return new String[] { "AES" };
076  }
077
078}