| /* |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.orc.impl; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.orc.InMemoryKeystore; |
| import org.apache.orc.OrcConf; |
| import org.apache.orc.OrcProto; |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Random; |
| import java.util.ServiceLoader; |
| import java.util.function.Consumer; |
| |
| /** |
| * This class has routines to work with encryption within ORC files. |
| */ |
| public class CryptoUtils { |
| |
| private static final int COLUMN_ID_LENGTH = 3; |
| private static final int KIND_LENGTH = 2; |
| private static final int STRIPE_ID_LENGTH = 3; |
| private static final int MIN_COUNT_BYTES = 8; |
| |
| static final int MAX_COLUMN = 0xffffff; |
| static final int MAX_KIND = 0xffff; |
| static final int MAX_STRIPE = 0xffffff; |
| |
| /** |
| * Update the unique IV for each stream within a single key. |
| * The top bytes are set with the column, stream kind, and stripe id and the |
| * lower 8 bytes are always 0. |
| * @param name the stream name |
| * @param stripeId the stripe id |
| */ |
| public static Consumer<byte[]> modifyIvForStream(StreamName name, |
| long stripeId) { |
| return modifyIvForStream(name.getColumn(), name.getKind(), stripeId); |
| } |
| |
| /** |
| * Update the unique IV for each stream within a single key. |
| * The top bytes are set with the column, stream kind, and stripe id and the |
| * lower 8 bytes are always 0. |
| * @param columnId the column id |
| * @param kind the stream kind |
| * @param stripeId the stripe id |
| */ |
| public static Consumer<byte[]> modifyIvForStream(int columnId, |
| OrcProto.Stream.Kind kind, |
| long stripeId) { |
| if (columnId < 0 || columnId > MAX_COLUMN) { |
| throw new IllegalArgumentException("ORC encryption is limited to " + |
| MAX_COLUMN + " columns. Value = " + columnId); |
| } |
| int k = kind.getNumber(); |
| if (k < 0 || k > MAX_KIND) { |
| throw new IllegalArgumentException("ORC encryption is limited to " + |
| MAX_KIND + " stream kinds. Value = " + k); |
| } |
| return (byte[] iv) -> { |
| // the rest of the iv is used for counting within the stream |
| if (iv.length - (COLUMN_ID_LENGTH + KIND_LENGTH + STRIPE_ID_LENGTH) < MIN_COUNT_BYTES) { |
| throw new IllegalArgumentException("Not enough space in the iv for the count"); |
| } |
| iv[0] = (byte) (columnId >> 16); |
| iv[1] = (byte) (columnId >> 8); |
| iv[2] = (byte) columnId; |
| iv[COLUMN_ID_LENGTH] = (byte) (k >> 8); |
| iv[COLUMN_ID_LENGTH + 1] = (byte) (k); |
| modifyIvForStripe(stripeId).accept(iv); |
| }; |
| } |
| |
| /** |
| * Modify the IV for the given stripe id and make sure the low bytes are |
| * set to 0. |
| * @param stripeId the stripe id |
| */ |
| public static Consumer<byte[]> modifyIvForStripe(long stripeId) { |
| if (stripeId < 1 || stripeId > MAX_STRIPE) { |
| throw new IllegalArgumentException("ORC encryption is limited to " + |
| MAX_STRIPE + " stripes. Value = " + |
| stripeId); |
| } |
| return (byte[] iv) -> { |
| iv[COLUMN_ID_LENGTH + KIND_LENGTH] = (byte) (stripeId >> 16); |
| iv[COLUMN_ID_LENGTH + KIND_LENGTH + 1] = (byte) (stripeId >> 8); |
| iv[COLUMN_ID_LENGTH + KIND_LENGTH + 2] = (byte) stripeId; |
| clearCounter(iv); |
| }; |
| } |
| |
| /** |
| * Clear the counter part of the IV. |
| * @param iv the IV to modify |
| */ |
| public static void clearCounter(byte[] iv) { |
| for(int i= COLUMN_ID_LENGTH + KIND_LENGTH + STRIPE_ID_LENGTH; i < iv.length; ++i) { |
| iv[i] = 0; |
| } |
| } |
| |
| /** A cache for the key providers */ |
| private static final Map<String, KeyProvider> keyProviderCache = new HashMap<>(); |
| |
| /** |
| * Create a KeyProvider. |
| * It will cache the result, so that only one provider of each kind will be |
| * created. |
| * |
| * @param random the random generator to use |
| * @return the new KeyProvider |
| */ |
| public static KeyProvider getKeyProvider(Configuration conf, |
| Random random) throws IOException { |
| String kind = OrcConf.KEY_PROVIDER.getString(conf); |
| String cacheKey = kind + "." + random.getClass().getName(); |
| KeyProvider result = keyProviderCache.get(cacheKey); |
| if (result == null) { |
| ServiceLoader<KeyProvider.Factory> loader = ServiceLoader.load(KeyProvider.Factory.class); |
| for (KeyProvider.Factory factory : loader) { |
| result = factory.create(kind, conf, random); |
| if (result != null) { |
| keyProviderCache.put(cacheKey, result); |
| break; |
| } |
| } |
| } |
| return result; |
| } |
| |
| public static class HadoopKeyProviderFactory implements KeyProvider.Factory { |
| |
| @Override |
| public KeyProvider create(String kind, |
| Configuration conf, |
| Random random) throws IOException { |
| if ("hadoop".equals(kind)) { |
| return HadoopShimsFactory.get().getHadoopKeyProvider(conf, random); |
| } else if ("memory".equals(kind)) { |
| return new InMemoryKeystore(random); |
| } |
| return null; |
| } |
| } |
| } |