ASF GitHub Bot commented on PARQUET-1373:

ggershinsky commented on a change in pull request #615:
URL: https://github.com/apache/parquet-mr/pull/615#discussion_r439953778

File path: 
@@ -0,0 +1,299 @@
+ * 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
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.parquet.crypto.keytools;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.parquet.crypto.AesGcmDecryptor;
+import org.apache.parquet.crypto.AesGcmEncryptor;
+import org.apache.parquet.crypto.AesMode;
+import org.apache.parquet.crypto.KeyAccessDeniedException;
+import org.apache.parquet.crypto.ModuleCipherFactory;
+import org.apache.parquet.crypto.ParquetCryptoRuntimeException;
+import org.apache.parquet.hadoop.BadConfigurationException;
+import org.apache.parquet.hadoop.util.ConfigurationUtil;
+import org.apache.parquet.hadoop.util.HiddenFileFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+public class KeyToolkit {
+  public static final String KMS_CLIENT_CLASS_PROPERTY_NAME = 
+  public static final String KMS_INSTANCE_ID_PROPERTY_NAME = 
+  public static final String DOUBLE_WRAPPING_PROPERTY_NAME = 
+  public static final String KEY_ACCESS_TOKEN_PROPERTY_NAME = 
+  public static final String TOKEN_LIFETIME_PROPERTY_NAME = 
+  public static final String KMS_INSTANCE_URL_PROPERTY_NAME = 
+  public static final String WRAP_LOCALLY_PROPERTY_NAME = 
+  public static final String KEY_MATERIAL_INTERNAL_PROPERTY_NAME = 

Review comment:
       Every property name in README.md starts with `"parquet."`. We'll do the 
same for the encryption properties.

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> Encryption key management tools 
> --------------------------------
>                 Key: PARQUET-1373
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1373
>             Project: Parquet
>          Issue Type: New Feature
>          Components: parquet-mr
>            Reporter: Gidon Gershinsky
>            Assignee: Gidon Gershinsky
>            Priority: Major
> Parquet Modular Encryption 
> ([PARQUET-1178|https://issues.apache.org/jira/browse/PARQUET-1178]) provides 
> an API that accepts keys, arbitrary key metadata and key retrieval callbacks 
> - which allows to implement basically any key management policy on top of it. 
> This Jira will add tools that implement a set of best practice elements for 
> key management. This is not an end-to-end key management, but rather a set of 
> components that might simplify design and development of an end-to-end 
> solution.
> This tool set is one of many possible. There is no goal to create a single or 
> “standard” toolkit for Parquet encryption keys. Parquet has a Crypto Factory 
> interface [(PARQUET-1817|https://issues.apache.org/jira/browse/PARQUET-1817]) 
> that allows to plug in different implementations of encryption key management.

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