| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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 com.android.server.backup.encryption.tasks; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.security.InvalidKeyException; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * Accepts the plaintext bytes of decrypted chunks and writes them to some output. Also keeps track |
| * of the message digest of the chunks. |
| */ |
| public interface DecryptedChunkOutput extends Closeable { |
| /** |
| * Opens whatever output the implementation chooses, ready to process chunks. |
| * |
| * @return {@code this}, to allow use with try-with-resources |
| */ |
| DecryptedChunkOutput open() throws IOException, NoSuchAlgorithmException; |
| |
| /** |
| * Writes the plaintext bytes of chunk to whatever output the implementation chooses. Also |
| * updates the digest with the chunk. |
| * |
| * <p>You must call {@link #open()} before this method, and you may not call it after calling |
| * {@link Closeable#close()}. |
| * |
| * @param plaintextBuffer An array containing the bytes of the plaintext of the chunk, starting |
| * at index 0. |
| * @param length The length in bytes of the plaintext contained in {@code plaintextBuffer}. |
| */ |
| void processChunk(byte[] plaintextBuffer, int length) |
| throws IOException, InvalidKeyException, NoSuchAlgorithmException; |
| |
| /** |
| * Returns the message digest of all the chunks processed by {@link #processChunk}. |
| * |
| * <p>You must call {@link Closeable#close()} before calling this method. |
| */ |
| byte[] getDigest() throws NoSuchAlgorithmException; |
| } |