Github user cjjnjust commented on a diff in the pull request:
https://github.com/apache/spark/pull/15172#discussion_r80615974
--- Diff:
common/network-common/src/main/java/org/apache/spark/network/sasl/aes/SparkAesCipher.java
---
@@ -0,0 +1,270 @@
+/*
+ * 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.spark.network.sasl.aes;
+
+import java.io.IOException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+import java.util.Properties;
+import javax.crypto.Cipher;
+import javax.crypto.Mac;
+import javax.crypto.SecretKey;
+import javax.crypto.ShortBufferException;
+import javax.crypto.spec.SecretKeySpec;
+import javax.crypto.spec.IvParameterSpec;
+import javax.security.sasl.SaslException;
+
+import org.apache.commons.crypto.cipher.CryptoCipher;
+import org.apache.commons.crypto.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * AES cipher for encryption and decryption.
+ */
+public class SparkAesCipher {
--- End diff --
Seq number and HMAC are necessary parts of SASL encryption, Seq number can
make same data with different offsets different, and HMAC is used for integrity
check, see com.sun.security.sasl.digest.DigestMD5Base class from JDK as example.
JDK's SASL framework doesn't provide interface to transfer AES cipher, it
creates cipher interanlly. For example DigestMD5 client create cipher
internally (DigestMD5Base.java:1219). However, it provides SaslEncryptBackend
interface for user to customize the SASL client/server, that's why the patch
implements wrap/unwrap.
Another way to make patch clean and clear is to add AES cipher support in
JDK's Digest-MD5 mechanism or change JDK SASL framework to provide a interface
support registering customized cipher, but that would be slow and depends on
JDK release.
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