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/*
* 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;
}
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