| /* |
| * Copyright (C) 2020 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 android.os.incremental; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| |
| /** |
| * V4 signature fields. |
| * Keep in sync with APKSig master copy. |
| * @hide |
| */ |
| public class V4Signature { |
| public static final String EXT = ".idsig"; |
| |
| public final byte[] verityRootHash; |
| public final byte[] v3Digest; |
| public final byte[] pkcs7SignatureBlock; |
| |
| /** |
| * Construct a V4Signature from .idsig file. |
| */ |
| public static V4Signature readFrom(File file) { |
| try (DataInputStream stream = new DataInputStream(new FileInputStream(file))) { |
| return readFrom(stream); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Store the V4Signature to a byte-array. |
| */ |
| public byte[] toByteArray() { |
| try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream()) { |
| try (DataOutputStream steam = new DataOutputStream(byteArrayOutputStream)) { |
| this.writeTo(steam); |
| steam.flush(); |
| } |
| return byteArrayOutputStream.toByteArray(); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| static V4Signature readFrom(DataInputStream stream) throws IOException { |
| byte[] verityRootHash = readBytes(stream); |
| byte[] v3Digest = readBytes(stream); |
| byte[] pkcs7SignatureBlock = readBytes(stream); |
| return new V4Signature(verityRootHash, v3Digest, pkcs7SignatureBlock); |
| } |
| |
| V4Signature(byte[] verityRootHash, byte[] v3Digest, byte[] pkcs7SignatureBlock) { |
| this.verityRootHash = verityRootHash; |
| this.v3Digest = v3Digest; |
| this.pkcs7SignatureBlock = pkcs7SignatureBlock; |
| } |
| |
| void writeTo(DataOutputStream stream) throws IOException { |
| writeBytes(stream, this.verityRootHash); |
| writeBytes(stream, this.v3Digest); |
| writeBytes(stream, this.pkcs7SignatureBlock); |
| } |
| |
| private static byte[] readBytes(DataInputStream stream) throws IOException { |
| byte[] result = new byte[stream.readInt()]; |
| stream.read(result); |
| return result; |
| } |
| |
| private static void writeBytes(DataOutputStream stream, byte[] bytes) throws IOException { |
| stream.writeInt(bytes.length); |
| stream.write(bytes); |
| } |
| } |