// Copyright 2018 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base/token.h" #include #include "base/pickle.h" #include "base/rand_util.h" #include "base/strings/stringprintf.h" #include "third_party/abseil-cpp/absl/types/optional.h" namespace base { // static Token Token::CreateRandom() { Token token; // Use base::RandBytes instead of crypto::RandBytes, because crypto calls the // base version directly, and to prevent the dependency from base/ to crypto/. base::RandBytes(&token, sizeof(token)); return token; } std::string Token::ToString() const { return base::StringPrintf("%016" PRIX64 "%016" PRIX64, words_[0], words_[1]); } // static absl::optional Token::FromString(StringPiece string_representation) { if (string_representation.size() != 32) { return absl::nullopt; } uint64_t words[2]; for (size_t i = 0; i < 2; i++) { uint64_t word = 0; // This j loop is similar to HexStringToUInt64 but we are intentionally // strict about case, accepting 'A' but rejecting 'a'. for (size_t j = 0; j < 16; j++) { const char c = string_representation[(16 * i) + j]; if (('0' <= c) && (c <= '9')) { word = (word << 4) | static_cast(c - '0'); } else if (('A' <= c) && (c <= 'F')) { word = (word << 4) | static_cast(c - 'A' + 10); } else { return absl::nullopt; } } words[i] = word; } return absl::optional(absl::in_place, words[0], words[1]); } void WriteTokenToPickle(Pickle* pickle, const Token& token) { pickle->WriteUInt64(token.high()); pickle->WriteUInt64(token.low()); } absl::optional ReadTokenFromPickle(PickleIterator* pickle_iterator) { uint64_t high; if (!pickle_iterator->ReadUInt64(&high)) return absl::nullopt; uint64_t low; if (!pickle_iterator->ReadUInt64(&low)) return absl::nullopt; return Token(high, low); } } // namespace base