Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/8880#discussion_r41583770 --- Diff: core/src/main/scala/org/apache/spark/crypto/CryptoInputStream.scala --- @@ -0,0 +1,439 @@ +/* + * 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.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 { + val oneByteBuf = new Array[Byte](1) + val codec = codecVal + + val bufferSize = CryptoStreamUtils.checkBufferSize(codecVal, bufferSizeVal) + /** + * Input data buffer. The data starts at inBuffer.position() and ends at + * to inBuffer.limit(). + */ + val inBuffer: ByteBuffer = ByteBuffer.allocateDirect(bufferSizeVal) + + /** + * The decrypted data buffer. The data starts at outBuffer.position() and + * ends at outBuffer.limit() + */ + val 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 */ + var bufferPool: Queue[ByteBuffer] = new ConcurrentLinkedQueue[ByteBuffer]() + /** Decryptor pool */ + var 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]) { + this(in, codec, bufferSize, key, iv, 0) + } + + def this(in: InputStream, + codec: CryptoCodec, + key: Array[Byte], + iv: Array[Byte]) { + this(in, codec, CryptoStreamUtils.getBufferSize, key, iv) + } + + def getWrappedStream(): InputStream = in + + /** + * Decryption is buffer based. + * If there is data in {@link #outBuffer}, then read it out of this buffer. + * If there is no data in {@link #outBuffer}, then read more from the + * underlying stream and do the decryption. + * @param b the buffer into which the decrypted data is read. + * @param off the buffer offset. + * @param len the maximum number of decrypted data bytes to read. + * @return int the total number of decrypted data bytes read into the buffer. + * @throws IOException + */ + override def read(b: Array[Byte], off: Int, len: Int): Int = { + checkStream + if (b == null) { + throw new NullPointerException() + } else if (off < 0 || len < 0 || len > b.length - off) { + throw new IndexOutOfBoundsException() + } else if (len == 0) { + 0 + } else { + val remaining: Integer = outBuffer.remaining() + if (remaining > 0) { + val n: Integer = Math.min(len, remaining) + outBuffer.get(b, off, n) + n + } else { + var n: Integer = 0 + /* + * Check whether the underlying stream is {@link ByteBufferReadable}, + * it can avoid bytes copy. + */ + if (usingByteBufferReadInitialized == false) { + usingByteBufferReadInitialized = true + if (isReadableByteChannel) { + try { + + n = (in.asInstanceOf[ReadableByteChannel]).read(inBuffer) + usingByteBufferRead = true + } catch { + case e: UnsupportedOperationException => + usingByteBufferRead = false + } + } else { + usingByteBufferRead = false + } + if (!usingByteBufferRead) { + n = readFromUnderlyingStream(inBuffer) + } + } else { + if (usingByteBufferRead) { + n = (in.asInstanceOf[ReadableByteChannel]).read(inBuffer) + } else { + n = readFromUnderlyingStream(inBuffer) + } + } + if (n <= 0) { + n + } else { + streamOffset += n // Read n bytes + decrypt(decryptor, inBuffer, outBuffer, padding) + padding = afterDecryption(decryptor, inBuffer, streamOffset, iv) + n = Math.min(len, outBuffer.remaining()) + outBuffer.get(b, off, n) + n + } + } + } + } + + /** Read data from underlying stream. */ + def readFromUnderlyingStream(inBuffer: ByteBuffer): Int = { + val toRead: Int = inBuffer.remaining + val tmp: Array[Byte] = getTmpBuf + val n: Int = in.read(tmp, 0, toRead) + if (n > 0) { + inBuffer.put(tmp, 0, n) + } + n + } + + + def getTmpBuf: Array[Byte] = { + if (tmpBuf == null) { + tmpBuf = new Array[Byte](bufferSize) + } + tmpBuf + } + + /** + * Do the decryption using inBuffer as input and outBuffer as output. + * Upon return, inBuffer is cleared the decrypted data starts at + * outBuffer.position() and ends at outBuffer.limit() + */ + def decrypt(decryptor: Decryptor, inBuffer: ByteBuffer, outBuffer: ByteBuffer, padding: Byte) { + Preconditions.checkState(inBuffer.position >= padding) + if (inBuffer.position != padding) { + inBuffer.flip + outBuffer.clear + decryptor.decrypt(inBuffer, outBuffer) + inBuffer.clear + outBuffer.flip + if (padding > 0) { + outBuffer.position(padding) + } + } + } + + /** + * This method is executed immediately after decryption. Check whether + * decryptor should be updated and recalculate padding if needed. + */ + def afterDecryption(decryptor: Decryptor, inBuffer: ByteBuffer, position: Long, + iv: Array[Byte]): Byte = { + var padding: Byte = 0 + if (decryptor.isContextReset) { + updateDecryptor(decryptor, position, iv) + padding = getPadding(position) + inBuffer.position(padding) + } + padding + } + + def getCounter(position: Long): Long = { + position / codec.getCipherSuite.algoBlockSize + } + + def getPadding(position: Long): Byte = { + (position % codec.getCipherSuite.algoBlockSize).asInstanceOf[Byte] + } + + /** Calculate the counter and iv, update the decryptor. */ + def updateDecryptor(decryptor: Decryptor, position: Long, iv: Array[Byte]) { + val counter: Long = getCounter(position) + codec.calculateIV(initIV, counter, iv) + decryptor.init(key, iv) + } + + /** + * Reset the underlying stream offset clear {@link #inBuffer} and + * {@link #outBuffer}. This Typically happens during {@link #seek(long)} + * or {@link #skip(long)}. + */ + def resetStreamOffset(offset: Long) { + streamOffset = offset + inBuffer.clear + outBuffer.clear + outBuffer.limit(0) + updateDecryptor(decryptor, offset, iv) + padding = getPadding(offset) + inBuffer.position(padding) + } + + override def close { + if (!closed) { + super.close + freeBuffers + closed = true + } + } + + /** Skip n bytes */ + override def skip(nVal: Long): Long = { + var n: Long = nVal + Preconditions.checkArgument(n >= 0, "Negative skip length.", new Array[String](1)) + checkStream + if (n == 0) { + 0 + } + else if (n <= outBuffer.remaining) { + val pos: Int = outBuffer.position + n.asInstanceOf[Int] + outBuffer.position(pos) + n + } + else { + n -= outBuffer.remaining + var skipped: Long = in.skip(n) + if (skipped < 0) { + skipped = 0 + } + val pos: Long = streamOffset + skipped + skipped += outBuffer.remaining + resetStreamOffset(pos) + skipped + } + } + + /** ByteBuffer read. */ + override def read(buf: ByteBuffer): Int = { + checkStream + if (isReadableByteChannel) { + val unread: Int = outBuffer.remaining + if (unread > 0) { + val toRead: Int = buf.remaining + if (toRead <= unread) { + val limit: Int = outBuffer.limit + outBuffer.limit(outBuffer.position + toRead) + buf.put(outBuffer) + outBuffer.limit(limit) + toRead + } + else { + buf.put(outBuffer) + } + } + val pos: Int = buf.position + val n: Int = (in.asInstanceOf[ReadableByteChannel]).read(buf) + if (n > 0) { + streamOffset += n + decrypt(buf, n, pos) + } + if (n >= 0) { + unread + n + } + else { + if (unread == 0) { + -1 + } + else { + unread + } + } + } + else { + var n: Int = 0 + if (buf.hasArray) { + n = read(buf.array, buf.position, buf.remaining) + if (n > 0) { + buf.position(buf.position + n) + } + } + else { + val tmp: Array[Byte] = new Array[Byte](buf.remaining) + n = read(tmp) + if (n > 0) { + buf.put(tmp, 0, n) + } + } + n + } + } + + /** + * Decrypt all data in buf: total n bytes from given start position. + * Output is also buf and same start position. + * buf.position() and buf.limit() should be unchanged after decryption. + */ + def decrypt(buf: ByteBuffer, n: Int, start: Int) { + val pos: Int = buf.position + val limit: Int = buf.limit + var len: Int = 0 + while (len < n) { + buf.position(start + len) + buf.limit(start + len + Math.min(n - len, inBuffer.remaining)) + inBuffer.put(buf) + try { + decrypt(decryptor, inBuffer, outBuffer, padding) + buf.position(start + len) + buf.limit(limit) + len += outBuffer.remaining + buf.put(outBuffer) + } + finally { --- End diff -- Same as with `else`, these should go in the previous line.
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