network/util/CryptoUtils.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.network.util;
0019
0020 import java.util.Map;
0021 import java.util.Properties;
0022
0023 /**
0024  * Utility methods related to the commons-crypto library.
0025  */
0026 public class CryptoUtils {
0027
0028   // The prefix for the configurations passing to Apache Commons Crypto library.
0029   public static final String COMMONS_CRYPTO_CONFIG_PREFIX = "commons.crypto.";
0030
0031   /**
0032    * Extract the commons-crypto configuration embedded in a list of config values.
0033    *
0034    * @param prefix Prefix in the given configuration that identifies the commons-crypto configs.
0035    * @param conf List of configuration values.
0036    */
0037   public static Properties toCryptoConf(String prefix, Iterable<Map.Entry<String, String>> conf) {
0038     Properties props = new Properties();
0039     for (Map.Entry<String, String> e : conf) {
0040       String key = e.getKey();
0041       if (key.startsWith(prefix)) {
0042         props.setProperty(COMMONS_CRYPTO_CONFIG_PREFIX + key.substring(prefix.length()),
0043           e.getValue());
0044       }
0045     }
0046     return props;
0047   }
0048
0049 }