| /* |
| * Copyright (C) 2016 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.apksig.internal.util; |
| |
| import com.android.apksig.util.DataSink; |
| import java.nio.ByteBuffer; |
| import java.security.MessageDigest; |
| |
| /** |
| * Data sink which feeds all received data into the associated {@link MessageDigest} instances. Each |
| * {@code MessageDigest} instance receives the same data. |
| */ |
| public class MessageDigestSink implements DataSink { |
| |
| private final MessageDigest[] mMessageDigests; |
| |
| public MessageDigestSink(MessageDigest[] digests) { |
| mMessageDigests = digests; |
| } |
| |
| @Override |
| public void consume(byte[] buf, int offset, int length) { |
| for (MessageDigest md : mMessageDigests) { |
| md.update(buf, offset, length); |
| } |
| } |
| |
| @Override |
| public void consume(ByteBuffer buf) { |
| int originalPosition = buf.position(); |
| for (MessageDigest md : mMessageDigests) { |
| // Reset the position back to the original because the previous iteration's |
| // MessageDigest.update set the buffer's position to the buffer's limit. |
| buf.position(originalPosition); |
| md.update(buf); |
| } |
| } |
| } |