[GitHub] [ozone] hanishakoneru commented on a change in pull request #1766: HDDS-4563. Support TDE for MPU Keys on Encrypted Buckets

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hanishakoneru commented on a change in pull request #1766:
URL: https://github.com/apache/ozone/pull/1766#discussion_r569798937



##########
File path: hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/MultipartCryptoKeyInputStream.java
##########
@@ -0,0 +1,373 @@
+/**
+ * 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.hadoop.ozone.client.io;
+
+import com.google.common.base.Preconditions;
+import org.apache.hadoop.crypto.CryptoInputStream;
+import org.apache.hadoop.fs.CanUnbuffer;
+import org.apache.hadoop.fs.FSExceptionMessages;
+import org.apache.hadoop.fs.Seekable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+public class MultipartCryptoKeyInputStream extends OzoneInputStream
+    implements Seekable, CanUnbuffer {
+
+  private static final Logger LOG =
+      LoggerFactory.getLogger(MultipartCryptoKeyInputStream.class);
+
+  private static final int EOF = -1;
+
+  private String key;
+  private long length = 0L;
+  private boolean closed = false;
+
+  // List of OzoneCryptoInputStream, one for each part of the key
+  private List<OzoneCryptoInputStream> partStreams;
+
+  // partOffsets[i] stores the index of the first data byte in
+  // partStream w.r.t the whole key data.
+  // For example, let’s say the part size is 200 bytes and part[0] stores
+  // data from indices 0 - 199, part[1] from indices 200 - 399 and so on.
+  // Then, partOffsets[0] = 0 (the offset of the first byte of data in
+  // part[0]), partOffsets[1] = 200 and so on.
+  private long[] partOffsets;
+
+  // Index of the partStream corresponding to the current position of the
+  // MultipartCryptoKeyInputStream i.e. offset of the data to be read next
+  private int partIndex = 0;
+
+  // Tracks the partIndex corresponding to the last seeked position so that it
+  // can be reset if a new position is seeked.
+  private int partIndexOfPrevPos = 0;

Review comment:
       Done.




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