anmolnar commented on code in PR #4125:
URL: https://github.com/apache/hbase/pull/4125#discussion_r899920930


##########
hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/X509Util.java:
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@@ -0,0 +1,310 @@
+/*
+ * 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.hadoop.hbase.io.crypto.tls;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.security.GeneralSecurityException;
+import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.NoSuchAlgorithmException;
+import java.security.Security;
+import java.security.cert.PKIXBuilderParameters;
+import java.security.cert.X509CertSelector;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicReference;
+import javax.net.ssl.CertPathTrustManagerParameters;
+import javax.net.ssl.KeyManager;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import javax.net.ssl.X509ExtendedTrustManager;
+import javax.net.ssl.X509KeyManager;
+import javax.net.ssl.X509TrustManager;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.exceptions.X509Exception;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Utility code for X509 handling Default cipher suites: Performance testing 
done by Facebook
+ * engineers shows that on Intel x86_64 machines, Java9 performs better with 
GCM and Java8 performs
+ * better with CBC, so these seem like reasonable defaults.
+ */
[email protected]
+public class X509Util {
+
+  private static final Logger LOG = LoggerFactory.getLogger(X509Util.class);
+
+  // Config
+  static final String CONFIG_PREFIX = "hbase.rpc.tls.";

Review Comment:
   I don't have enough experience with HBase to confidently answer this 
question. ZooKeeper doesn't have separate TLS config between client and server, 
though technically it's manageable, because client and server are usually 
running on different hosts.



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