Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8880#discussion_r40599644
--- Diff:
core/src/main/scala/org/apache/spark/crypto/CryptoInputStream.scala ---
@@ -0,0 +1,434 @@
+/*
+ * 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.{IOException, InputStream, FilterInputStream}
+import java.lang.UnsupportedOperationException
+import java.nio.ByteBuffer
+import java.nio.channels.ReadableByteChannel
+import java.security.GeneralSecurityException
+import java.util.Queue
+import java.util.concurrent.ConcurrentLinkedQueue
+
+import com.google.common.base.Preconditions
+
+/**
+ * CryptoInputStream decrypts data. It is not thread-safe. AES CTR mode is
+ * required in order to ensure that the plain text and cipher text have a
1:1
+ * mapping. The decryption is buffer based. The key points of the
decryption
+ * are (1) calculating the counter and (2) padding through stream position:
+ * <p/>
+ * counter = base + pos/(algorithm blocksize);
+ * padding = pos%(algorithm blocksize);
+ * <p/>
+ * The underlying stream offset is maintained as state.
+ */
+class CryptoInputStream(in: InputStream, codecVal: CryptoCodec,
+ bufferSizeVal: Integer, keyVal: Array[Byte],
ivVal: Array[Byte],
+ streamOffsetVal: Long) extends
FilterInputStream(in: InputStream) with
+ReadableByteChannel {
+ var oneByteBuf: Array[Byte] = new Array[Byte](1)
+ var codec: CryptoCodec = codecVal
+
+ var bufferSize: Integer = CryptoStreamUtils.checkBufferSize(codecVal,
bufferSizeVal)
+ /**
+ * Input data buffer. The data starts at inBuffer.position() and ends at
+ * to inBuffer.limit().
+ */
+ var inBuffer: ByteBuffer = ByteBuffer.allocateDirect(bufferSizeVal)
+
+ /**
+ * The decrypted data buffer. The data starts at outBuffer.position() and
+ * ends at outBuffer.limit()
+ */
+ var outBuffer: ByteBuffer = ByteBuffer.allocateDirect(bufferSizeVal)
+ var streamOffset: Long = streamOffsetVal // Underlying stream offset.
+
+ /**
+ * Whether the underlying stream supports
+ * {@link org.apache.hadoop.fs.ByteBufferReadable}
+ */
+ var usingByteBufferRead: Boolean = false
+ var usingByteBufferReadInitialized: Boolean = false
+ /**
+ * Padding = pos%(algorithm blocksize) Padding is put into {@link
#inBuffer}
+ * before any other data goes in. The purpose of padding is to put the
input
+ * data at proper position.
+ */
+ var padding: Byte = '0'
+ var closed: Boolean = false
+ var key: Array[Byte] = keyVal.clone()
+ var initIV: Array[Byte] = ivVal.clone()
+ var iv: Array[Byte] = ivVal.clone()
+ var isReadableByteChannel: Boolean = in.isInstanceOf[ReadableByteChannel]
+
+ /** DirectBuffer pool */
+ val bufferPool: Queue[ByteBuffer] =
+ new ConcurrentLinkedQueue[ByteBuffer]()
+ /** Decryptor pool */
+ val decryptorPool: Queue[Decryptor] =
+ new ConcurrentLinkedQueue[Decryptor]()
+
+ var tmpBuf: Array[Byte] = null
+ var decryptor: Decryptor = getDecryptor
+ CryptoStreamUtils.checkCodec(codecVal)
+ resetStreamOffset(streamOffset)
+
+
+ def this(in: InputStream, codec: CryptoCodec,
+ bufferSize: Integer, key: Array[Byte], iv: Array[Byte]) {
--- End diff --
nit: indentation style.
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