Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8880#discussion_r76101343
--- Diff: core/src/main/scala/org/apache/spark/SecurityManager.scala ---
@@ -551,4 +555,20 @@ private[spark] object SecurityManager {
// key used to store the spark secret in the Hadoop UGI
val SECRET_LOOKUP_KEY = "sparkCookie"
+
+ /**
+ * Setup the cryptographic key used by IO encryption in credentials. The
key is generated using
+ * [[KeyGenerator]]. The algorithm and key length is specified by the
[[SparkConf]].
+ */
+ def initIOEncryptionKey(conf: SparkConf, credentials: Credentials): Unit
= {
+ if (credentials.getSecretKey(SPARK_IO_TOKEN) == null) {
+ val keyLen = conf.get(SPARK_IO_ENCRYPTION_KEY_SIZE_BITS)
+ val IOKeyGenAlgorithm =
conf.get(SPARK_IO_ENCRYPTION_KEYGEN_ALGORITHM)
+ val keyGen = KeyGenerator.getInstance(IOKeyGenAlgorithm)
+ keyGen.init(keyLen)
+
+ val IOKey = keyGen.generateKey()
--- End diff --
nit: `ioKey`
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