/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "TokenHasher.h"
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#include "NeuralNetworks.h"
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#include <android-base/logging.h>
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#include <openssl/sha.h>
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namespace android {
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namespace nn {
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TokenHasher::TokenHasher(const uint8_t* token) : mIsError(token == nullptr) {
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if (mIsError) {
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return;
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}
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if (SHA256_Init(&mHasher) == 0 ||
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SHA256_Update(&mHasher, token, ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN) == 0) {
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mIsError = true;
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}
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}
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bool TokenHasher::update(const void* bytes, size_t length) {
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CHECK(!mIsError) << "Calling update on an token in error state";
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if (SHA256_Update(&mHasher, bytes, length) == 0) {
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mIsError = true;
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return false;
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}
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return true;
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}
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bool TokenHasher::finish() {
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CHECK(!mIsError) << "Calling finish on an token in error state";
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static_assert(SHA256_DIGEST_LENGTH == ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN,
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"SHA256_DIGEST_LENGTH != ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN");
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mToken.resize(ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN);
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if (SHA256_Final(mToken.data(), &mHasher) == 0) {
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mToken.clear();
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mIsError = true;
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return false;
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}
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return true;
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}
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const uint8_t* TokenHasher::getCacheToken() const {
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if (mIsError) {
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return nullptr;
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} else {
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CHECK(!mToken.empty());
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return mToken.data();
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}
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}
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} // namespace nn
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} // namespace android
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