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 #include "TokenHasher.h" 18 19 #include "NeuralNetworks.h" 20 21 #include <android-base/logging.h> 22 #include <openssl/sha.h> 23 24 namespace android { 25 namespace nn { 26 27 TokenHasher::TokenHasher(const uint8_t* token) : mIsError(token == nullptr) { 28 if (mIsError) { 29 return; 30 } 31 if (SHA256_Init(&mHasher) == 0 || 32 SHA256_Update(&mHasher, token, ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN) == 0) { 33 mIsError = true; 34 } 35 } 36 37 bool TokenHasher::update(const void* bytes, size_t length) { 38 CHECK(!mIsError) << "Calling update on an token in error state"; 39 if (SHA256_Update(&mHasher, bytes, length) == 0) { 40 mIsError = true; 41 return false; 42 } 43 return true; 44 } 45 46 bool TokenHasher::finish() { 47 CHECK(!mIsError) << "Calling finish on an token in error state"; 48 static_assert(SHA256_DIGEST_LENGTH == ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN, 49 "SHA256_DIGEST_LENGTH != ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN"); 50 mToken.resize(ANEURALNETWORKS_BYTE_SIZE_OF_CACHE_TOKEN); 51 if (SHA256_Final(mToken.data(), &mHasher) == 0) { 52 mToken.clear(); 53 mIsError = true; 54 return false; 55 } 56 return true; 57 } 58 59 const uint8_t* TokenHasher::getCacheToken() const { 60 if (mIsError) { 61 return nullptr; 62 } else { 63 CHECK(!mToken.empty()); 64 return mToken.data(); 65 } 66 } 67 68 } // namespace nn 69 } // namespace android 70
