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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with this
4    * work for additional information regarding copyright ownership. The ASF
5    * licenses this file to you under the Apache License, Version 2.0 (the
6    * "License"); you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    * http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
13   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
14   * License for the specific language governing permissions and limitations under
15   * the License.
16   */
17  package org.apache.hadoop.hbase.io.crypto;
18  
19  import org.apache.hadoop.classification.InterfaceAudience;
20  import org.apache.hadoop.classification.InterfaceStability;
21  import org.apache.hadoop.conf.Configuration;
22  import org.apache.hadoop.hbase.HBaseConfiguration;
23  import org.apache.hadoop.hbase.io.crypto.aes.AES;
24  
25  /**
26   * The default cipher provider. Supports AES via the JCE.
27   */
28  @InterfaceAudience.Public
29  @InterfaceStability.Evolving
30  public final class DefaultCipherProvider implements CipherProvider {
31  
32    private static DefaultCipherProvider instance;
33  
34    public static DefaultCipherProvider getInstance() {
35      if (instance != null) {
36        return instance;
37      }
38      instance = new DefaultCipherProvider();
39      return instance;
40    }
41  
42    private Configuration conf = HBaseConfiguration.create();
43  
44    // Prevent instantiation
45    private DefaultCipherProvider() { }
46  
47    @Override
48    public Configuration getConf() {
49      return conf;
50    }
51  
52    @Override
53    public void setConf(Configuration conf) {
54      this.conf = conf;
55    }
56  
57    @Override
58    public String getName() {
59      return "default";
60    }
61  
62    @Override
63    public Cipher getCipher(String name) {
64      if (name.equalsIgnoreCase("AES")) {
65        return new AES(this);
66      }
67      throw new RuntimeException("Cipher '" + name + "' is not supported by provider '" +
68          getName() + "'");
69    }
70  
71    @Override
72    public String[] getSupportedCiphers() {
73      return new String[] { "AES" };
74    }
75  
76  }