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 #define LOG_TAG "TokenHasher"
18
19 #include "TokenHasher.h"
20
21 #include "NeuralNetworks.h"
22
23 #include <android-base/logging.h>
24 #include <openssl/sha.h>
25
26 namespace android {
27 namespace nn {
28
TokenHasher(const uint8_t * token)29 TokenHasher::TokenHasher(const uint8_t* token) : mIsError(token == nullptr) {
30 if (mIsError) {
31 return;
32 }
33 if (SHA256_Init(&mHasher) == 0 ||
34 SHA256_Update(&mHasher, token, ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN) == 0) {
35 mIsError = true;
36 }
37 }
38
update(const void * bytes,size_t length)39 bool TokenHasher::update(const void* bytes, size_t length) {
40 CHECK(!mIsError) << "Calling update on an token in error state";
41 if (SHA256_Update(&mHasher, bytes, length) == 0) {
42 mIsError = true;
43 return false;
44 }
45 return true;
46 }
47
finish()48 bool TokenHasher::finish() {
49 CHECK(!mIsError) << "Calling finish on an token in error state";
50 static_assert(SHA256_DIGEST_LENGTH == ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN,
51 "SHA256_DIGEST_LENGTH != ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN");
52 mToken.resize(ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN);
53 if (SHA256_Final(mToken.data(), &mHasher) == 0) {
54 mToken.clear();
55 mIsError = true;
56 return false;
57 }
58 return true;
59 }
60
getCacheToken() const61 const uint8_t* TokenHasher::getCacheToken() const {
62 if (mIsError) {
63 return nullptr;
64 } else {
65 CHECK(!mToken.empty());
66 return mToken.data();
67 }
68 }
69
70 } // namespace nn
71 } // namespace android
72