Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/8880#discussion_r76318724
--- Diff:
core/src/main/scala/org/apache/spark/security/CryptoStreamUtils.scala ---
@@ -0,0 +1,106 @@
+/*
+ * 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.security
+
+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.hadoop.io.Text
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.internal.config._
+
+/**
+ * A util class for manipulating IO encryption and decryption streams.
+ */
+private[spark] object CryptoStreamUtils {
+ /**
+ * Constants and variables for spark IO encryption
+ */
+ val SPARK_IO_TOKEN = new Text("SPARK_IO_TOKEN")
+
+ // The initialization vector length in bytes.
+ val IV_LENGTH_IN_BYTES = 16
+ // The prefix of IO encryption related configurations in Spark
configuration.
+ val SPARK_IO_ENCRYPTION_COMMONS_CONFIG_PREFIX =
"spark.io.encryption.commons.config."
+ // The prefix for the configurations passing to Apache 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_IO_ENCRYPTION_COMMONS_CONFIG_PREFIX,
+ COMMONS_CRYPTO_CONF_PREFIX)
+ val iv = createInitializationVector(properties)
+ os.write(iv)
+ val credentials = SparkHadoopUtil.get.getCurrentUserCredentials()
+ val key = credentials.getSecretKey(SPARK_IO_TOKEN)
+ val transformationStr = sparkConf.get(IO_CRYPTO_CIPHER_TRANSFORMATION)
+ new CryptoOutputStream(transformationStr, properties, os,
+ new SecretKeySpec(key, "AES"), new IvParameterSpec(iv))
+ }
+
+ /**
+ * Helper method to wrap [[InputStream]] with [[CryptoInputStream]] for
decryption.
+ */
+ def createCryptoInputStream(
+ is: InputStream,
+ sparkConf: SparkConf): InputStream = {
+ val properties = toCryptoConf(sparkConf,
SPARK_IO_ENCRYPTION_COMMONS_CONFIG_PREFIX,
+ COMMONS_CRYPTO_CONF_PREFIX)
+ val iv = new Array[Byte](IV_LENGTH_IN_BYTES)
+ is.read(iv, 0, iv.length)
+ val credentials = SparkHadoopUtil.get.getCurrentUserCredentials()
+ val key = credentials.getSecretKey(SPARK_IO_TOKEN)
+ val transformationStr = sparkConf.get(IO_CRYPTO_CIPHER_TRANSFORMATION)
+ new CryptoInputStream(transformationStr, properties, is,
+ new SecretKeySpec(key, "AES"), new IvParameterSpec(iv))
+ }
+
+ /**
+ * Get Commons-crypto configurations from Spark configurations
identified by prefix.
+ */
+ def toCryptoConf(
+ conf: SparkConf,
+ sparkPrefix: String,
+ cryptoPrefix: String): Properties = {
--- End diff --
nit: you don't need `sparkPrefix` and `cryptoPrefix` any more.
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