| /* |
| * Copyright (C) 2020 Square, Inc. and others. |
| * |
| * Licensed 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 okio |
| |
| import java.io.IOException |
| import javax.crypto.Cipher |
| |
| class CipherSink( |
| private val sink: BufferedSink, |
| val cipher: Cipher |
| ) : Sink { |
| private val blockSize = cipher.blockSize |
| private var closed = false |
| |
| init { |
| // Require block cipher |
| require(blockSize > 0) { "Block cipher required $cipher" } |
| } |
| |
| @Throws(IOException::class) |
| override fun write(source: Buffer, byteCount: Long) { |
| checkOffsetAndCount(source.size, 0, byteCount) |
| check(!closed) { "closed" } |
| |
| var remaining = byteCount |
| while (remaining > 0) { |
| val size = update(source, remaining) |
| remaining -= size |
| } |
| } |
| |
| private fun update(source: Buffer, remaining: Long): Int { |
| val head = source.head!! |
| var size = minOf(remaining, head.limit - head.pos).toInt() |
| val buffer = sink.buffer |
| |
| // Shorten input until output is guaranteed to fit within a segment |
| var outputSize = cipher.getOutputSize(size) |
| while (outputSize > Segment.SIZE) { |
| check(size > blockSize) { "Unexpected output size $outputSize for input size $size" } |
| size -= blockSize |
| outputSize = cipher.getOutputSize(size) |
| } |
| val s = buffer.writableSegment(outputSize) |
| |
| val ciphered = cipher.update(head.data, head.pos, size, s.data, s.limit) |
| |
| s.limit += ciphered |
| buffer.size += ciphered |
| |
| // We allocated a tail segment, but didn't end up needing it. Recycle! |
| if (s.pos == s.limit) { |
| buffer.head = s.pop() |
| SegmentPool.recycle(s) |
| } |
| |
| sink.emitCompleteSegments() |
| |
| // Mark those bytes as read. |
| source.size -= size |
| head.pos += size |
| if (head.pos == head.limit) { |
| source.head = head.pop() |
| SegmentPool.recycle(head) |
| } |
| |
| return size |
| } |
| |
| override fun flush() = sink.flush() |
| |
| override fun timeout() = sink.timeout() |
| |
| @Throws(IOException::class) |
| override fun close() { |
| if (closed) return |
| closed = true |
| |
| var thrown = doFinal() |
| |
| try { |
| sink.close() |
| } catch (e: Throwable) { |
| if (thrown == null) thrown = e |
| } |
| |
| if (thrown != null) throw thrown |
| } |
| |
| private fun doFinal(): Throwable? { |
| val outputSize = cipher.getOutputSize(0) |
| if (outputSize == 0) return null |
| |
| var thrown: Throwable? = null |
| val buffer = sink.buffer |
| |
| // For block cipher, output size cannot exceed block size in doFinal |
| val s = buffer.writableSegment(outputSize) |
| |
| try { |
| val ciphered = cipher.doFinal(s.data, s.limit) |
| |
| s.limit += ciphered |
| buffer.size += ciphered |
| } catch (e: Throwable) { |
| thrown = e |
| } |
| |
| if (s.pos == s.limit) { |
| buffer.head = s.pop() |
| SegmentPool.recycle(s) |
| } |
| |
| return thrown |
| } |
| } |