Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8880#discussion_r40596818
  
    --- Diff: core/src/main/scala/org/apache/spark/crypto/CipherSuite.scala ---
    @@ -0,0 +1,81 @@
    +/*
    + * 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
    +
    +/**
    + * Defines properties of a CipherSuite. Modeled after the ciphers in
    + * {@link javax.crypto.Cipher}.
    + * @param name    name of cipher suite, as in {@link javax.crypto.Cipher}
    + * @param algoBlockSize size of an algorithm block in bytes
    + */
    +case class CipherSuite(name: String, algoBlockSize: Int) {
    +  var unknownValue: Integer = null
    +
    +  def setUnknownValue(unknown: Integer) {
    +    this.unknownValue = unknown
    +  }
    +
    +  def getUnknownValue(): Integer = unknownValue
    +
    +
    +  override  def toString(): String = {
    +    var builder: StringBuilder = new StringBuilder("{")
    +    builder.append("name: " + name)
    +    builder.append(", algorithmBlockSize: " + algoBlockSize)
    +    if (unknownValue != null) {
    +      builder.append(", unknownValue: " + unknownValue)
    +    }
    +    builder.append("}")
    +    builder.toString()
    +  }
    +
    +  /**
    +   * Returns suffix of cipher suite configuration.
    +   * @return String configuration suffix
    +   */
    +  def getConfigSuffix(): String = {
    +    val parts = name.split("/")
    +    var suffix: StringBuilder = new StringBuilder()
    +    parts.foreach(part =>
    +      suffix.append(".").append(part.toLowerCase())
    +    )
    +    suffix.toString()
    +  }
    +}
    +
    +
    +object UNKNOWN extends CipherSuite("Unknown", 0)
    +
    +object AES_CTR_NOPADDING extends CipherSuite("AES/CTR/NoPadding", 16)
    +
    +object CipherSuite {
    +  /**
    +   * Convert to CipherSuite from name, {@link #algoBlockSize} is fixed for
    +   * certain cipher suite, just need to compare the name.
    +   * @param name cipher suite name
    +   * @return CipherSuite cipher suite
    +   */
    +  def convert(name: String): CipherSuite = {
    +    if (name.equals(AES_CTR_NOPADDING.name)) {
    --- End diff --
    
    use `name match { ... }` instead of cascading ifs. Also, if you call this 
method `apply`, you can just say `CipherSuite("foo")` instead of 
`CipherSuite.convert("foo")`.


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