1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <string>
20 
21 #include "apex_file.h"
22 
23 namespace android {
24 namespace apex {
25 
26 std::string BytesToHex(const uint8_t* bytes, size_t len);
27 
28 enum PrepareHashTreeResult {
29   kReuse = 0,
30   KRegenerate = 1,
31 };
32 
33 // Generates a dm-verity hashtree of a given |apex| if |hashtree_file| doesn't
34 // exist or it's root_digest doesn't match |verity_data.root_digest|. Otherwise
35 // does nothing.
36 android::base::Result<PrepareHashTreeResult> PrepareHashTree(
37     const ApexFile& apex, const ApexVerityData& verity_data,
38     const std::string& hashtree_file);
39 
40 void RemoveObsoleteHashTrees();
41 
42 }  // namespace apex
43 }  // namespace android
44