Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8880#discussion_r75548733
--- Diff:
core/src/main/scala/org/apache/spark/crypto/CryptoStreamUtils.scala ---
@@ -0,0 +1,104 @@
+/*
+ * 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.crypto
+
+import java.io.{InputStream, OutputStream}
+import java.util.Properties
+import javax.crypto.spec.{IvParameterSpec, SecretKeySpec}
+
+import org.apache.commons.crypto.random._
+import org.apache.commons.crypto.stream._
+
+import org.apache.spark.SparkConf
+import org.apache.spark.crypto.CryptoConf._
+import org.apache.spark.deploy.SparkHadoopUtil
+
+/**
+ * A util class for manipulating file shuffle encryption and decryption
streams.
+ */
+private[spark] object CryptoStreamUtils {
+ // The initialization vector length in bytes.
+ val IV_LENGTH_IN_BYTES = 16
+ // The prefix of Crypto related configurations in Spark configuration.
+ val SPARK_COMMONS_CRYPTO_CONF_PREFIX = "spark.commons.crypto."
+ // The prefix for the configurations passing to Commons-crypto library.
+ val COMMONS_CRYPTO_CONF_PREFIX = "commons.crypto."
+
+
+ /**
+ * Helper method to wrap [[OutputStream]] with [[CryptoOutputStream]]
for encryption.
+ */
+ def createCryptoOutputStream(
+ os: OutputStream,
+ sparkConf: SparkConf): OutputStream = {
+ val properties = toCryptoConf(sparkConf,
SPARK_COMMONS_CRYPTO_CONF_PREFIX,
+ COMMONS_CRYPTO_CONF_PREFIX)
+ val iv: Array[Byte] = createInitializationVector(properties)
+ os.write(iv)
+ val credentials = SparkHadoopUtil.get.getCurrentUserCredentials()
+ val key = credentials.getSecretKey(SPARK_SHUFFLE_TOKEN)
+ val transformationStr = sparkConf.get(
+ "spark.shuffle.crypto.cipher.transformation", "AES/CTR/NoPadding")
--- End diff --
Add a new config constant.
---
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