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/*
* Copyright (C) 2017 Team Win Recovery 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.
*/
/* To the best of my knowledge there is no native implementation for
* Weaver so I made this by looking at the IWeaver.h file that gets
* compiled by the build system. I took the information from this header
* file and looked at keymaster source to get an idea of the proper way
* to write the functions.
*/
#include "Weaver1.h"
//#include <android-base/logging.h>
#include <keystore/keymaster_tags.h>
#include <keystore/authorization_set.h>
#include <keystore/keystore_hidl_support.h>
#include <android/hardware/weaver/1.0/IWeaver.h>
#include <iostream>
#define ERROR 1
#define LOG(x) std::cout
using namespace android::hardware::weaver;
using android::hardware::hidl_string;
using ::android::hardware::weaver::V1_0::IWeaver;
using ::android::hardware::weaver::V1_0::WeaverConfig;
using ::android::hardware::weaver::V1_0::WeaverReadStatus;
using ::android::hardware::weaver::V1_0::WeaverReadResponse;
using ::android::hardware::weaver::V1_0::WeaverStatus;
using ::android::hardware::Return;
using ::android::sp;
namespace android {
namespace vold {
Weaver::Weaver() {
mDevice = ::android::hardware::weaver::V1_0::IWeaver::getService();
GottenConfig = false;
}
bool Weaver::GetConfig() {
if (GottenConfig)
return true;
WeaverStatus status;
WeaverConfig cfg;
bool callbackCalled = false;
auto ret = mDevice->getConfig([&](WeaverStatus s, WeaverConfig c) {
callbackCalled = true;
status = s;
cfg = c;
});
if (ret.isOk() && callbackCalled && status == WeaverStatus::OK) {
config = cfg;
GottenConfig = true;
return true;
}
return false;
}
bool Weaver::GetSlots(uint32_t* slots) {
if (!GetConfig())
return false;
*slots = config.slots;
return true;
}
bool Weaver::GetKeySize(uint32_t* keySize) {
if (!GetConfig())
return false;
*keySize = config.keySize;
return true;
}
bool Weaver::GetValueSize(uint32_t* valueSize) {
if (!GetConfig())
return false;
*valueSize = config.valueSize;
return true;
}
// TODO: we should return more information about the status including time delays before the next retry
bool Weaver::WeaverVerify(const uint32_t slot, const void* weaver_key, std::vector<uint8_t>* payload) {
bool callbackCalled = false;
WeaverReadStatus status;
std::vector<uint8_t> readValue;
uint32_t timeout;
uint32_t keySize;
if (!GetKeySize(&keySize))
return false;
std::vector<uint8_t> key;
key.resize(keySize);
uint32_t index = 0;
unsigned char* ptr = (unsigned char*)weaver_key;
for (index = 0; index < keySize; index++) {
key[index] = *ptr;
ptr++;
}
const auto readRet = mDevice->read(slot, key, [&](WeaverReadStatus s, WeaverReadResponse r) {
callbackCalled = true;
status = s;
readValue = r.value;
timeout = r.timeout;
});
if (readRet.isOk() && callbackCalled && status == WeaverReadStatus::OK && timeout == 0) {
*payload = readValue;
return true;
}
return false;
}
} // namespace vold
} // namespace android
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