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- // 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 <inttypes.h>
- #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> 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<uint64_t>(c - '0');
- } else if (('A' <= c) && (c <= 'F')) {
- word = (word << 4) | static_cast<uint64_t>(c - 'A' + 10);
- } else {
- return absl::nullopt;
- }
- }
- words[i] = word;
- }
- return absl::optional<Token>(absl::in_place, words[0], words[1]);
- }
- void WriteTokenToPickle(Pickle* pickle, const Token& token) {
- pickle->WriteUInt64(token.high());
- pickle->WriteUInt64(token.low());
- }
- absl::optional<Token> 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
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