blob: ea357edccaaa8a784ee17c694e1bee94035906b6 [file] [log] [blame]
Ethan Yonkerfefe5912017-09-30 22:22:13 -05001/*
2 * Copyright (C) 2017 Team Win Recovery 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/* To the best of my knowledge there is no native implementation for
18 * Weaver so I made this by looking at the IWeaver.h file that gets
19 * compiled by the build system. I took the information from this header
20 * file and looked at keymaster source to get an idea of the proper way
21 * to write the functions.
22 */
23
24#include "Weaver1.h"
25
26//#include <android-base/logging.h>
Ethan Yonkere9afc3d2018-08-30 15:16:27 -050027//#include <keystore/keymaster_tags.h>
28//#include <keystore/authorization_set.h>
29//#include <keystore/keystore_hidl_support.h>
Ethan Yonkerfefe5912017-09-30 22:22:13 -050030
31#include <android/hardware/weaver/1.0/IWeaver.h>
32
33#include <iostream>
34#define ERROR 1
35#define LOG(x) std::cout
36
37using namespace android::hardware::weaver;
38using android::hardware::hidl_string;
39using ::android::hardware::weaver::V1_0::IWeaver;
40using ::android::hardware::weaver::V1_0::WeaverConfig;
41using ::android::hardware::weaver::V1_0::WeaverReadStatus;
42using ::android::hardware::weaver::V1_0::WeaverReadResponse;
43using ::android::hardware::weaver::V1_0::WeaverStatus;
44using ::android::hardware::Return;
45using ::android::sp;
46
47namespace android {
48namespace vold {
49
50Weaver::Weaver() {
51 mDevice = ::android::hardware::weaver::V1_0::IWeaver::getService();
52 GottenConfig = false;
53}
54
55bool Weaver::GetConfig() {
56 if (GottenConfig)
57 return true;
58
59 WeaverStatus status;
60 WeaverConfig cfg;
61
62 bool callbackCalled = false;
63 auto ret = mDevice->getConfig([&](WeaverStatus s, WeaverConfig c) {
64 callbackCalled = true;
65 status = s;
66 cfg = c;
67 });
68 if (ret.isOk() && callbackCalled && status == WeaverStatus::OK) {
69 config = cfg;
70 GottenConfig = true;
71 return true;
72 }
73 return false;
74}
75
76bool Weaver::GetSlots(uint32_t* slots) {
77 if (!GetConfig())
78 return false;
79 *slots = config.slots;
80 return true;
81}
82
83bool Weaver::GetKeySize(uint32_t* keySize) {
84 if (!GetConfig())
85 return false;
86 *keySize = config.keySize;
87 return true;
88}
89
90bool Weaver::GetValueSize(uint32_t* valueSize) {
91 if (!GetConfig())
92 return false;
93 *valueSize = config.valueSize;
94 return true;
95}
96
97// TODO: we should return more information about the status including time delays before the next retry
98bool Weaver::WeaverVerify(const uint32_t slot, const void* weaver_key, std::vector<uint8_t>* payload) {
99 bool callbackCalled = false;
100 WeaverReadStatus status;
101 std::vector<uint8_t> readValue;
102 uint32_t timeout;
103 uint32_t keySize;
104 if (!GetKeySize(&keySize))
105 return false;
106 std::vector<uint8_t> key;
107 key.resize(keySize);
108 uint32_t index = 0;
109 unsigned char* ptr = (unsigned char*)weaver_key;
110 for (index = 0; index < keySize; index++) {
111 key[index] = *ptr;
112 ptr++;
113 }
114 const auto readRet = mDevice->read(slot, key, [&](WeaverReadStatus s, WeaverReadResponse r) {
115 callbackCalled = true;
116 status = s;
117 readValue = r.value;
118 timeout = r.timeout;
119 });
120 if (readRet.isOk() && callbackCalled && status == WeaverReadStatus::OK && timeout == 0) {
121 *payload = readValue;
122 return true;
123 }
124 return false;
125}
126
127} // namespace vold
128} // namespace android