Github user sohami commented on a diff in the pull request:
https://github.com/apache/drill/pull/773#discussion_r111649193
--- Diff:
exec/rpc/src/main/java/org/apache/drill/exec/rpc/SaslDecryptionHandler.java ---
@@ -0,0 +1,158 @@
+/*
+ * 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
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.drill.exec.rpc;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToMessageDecoder;
+
+import org.apache.drill.exec.exception.OutOfMemoryException;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.List;
+/**
+ * Handler to Decrypt the input ByteBuf. It expects input to be in format
where it has length of the bytes to
+ * decode in network order and actual encrypted bytes. The handler reads
the length and then reads the
+ * required bytes to pass it to unwrap function for decryption. The
decrypted buffer is copied to a new
+ * ByteBuf and added to out list.
+ * <p>
+ * Example:
+ * <li>Input - [EBLN1, EB1, EBLN2, EB2] --> ByteBuf with repeated
combination of encrypted byte length
+ * in network order (EBLNx) and encrypted bytes (EB)
+ * <li>Output - [DB1] --> Decrypted ByteBuf of first chunk.(EB1)
+ * </p>
+ */
+class SaslDecryptionHandler extends MessageToMessageDecoder<ByteBuf> {
+
+ final org.slf4j.Logger logger;
--- End diff --
fixed.
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