| // Copyright 2016 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/unguessable_token.h" |
| |
| #include "base/format_macros.h" |
| #include "base/no_destructor.h" |
| #include "base/rand_util.h" |
| #include "base/strings/stringprintf.h" |
| |
| namespace base { |
| |
| UnguessableToken::UnguessableToken(const base::Token& token) : token_(token) {} |
| |
| // static |
| UnguessableToken UnguessableToken::Create() { |
| return UnguessableToken(Token::CreateRandom()); |
| } |
| |
| // static |
| const UnguessableToken& UnguessableToken::Null() { |
| static const NoDestructor<UnguessableToken> null_token; |
| return *null_token; |
| } |
| |
| // static |
| UnguessableToken UnguessableToken::Deserialize(uint64_t high, uint64_t low) { |
| // Receiving a zeroed out UnguessableToken from another process means that it |
| // was never initialized via Create(). Treat this case as a security issue. |
| DCHECK(!(high == 0 && low == 0)); |
| return UnguessableToken(Token{high, low}); |
| } |
| |
| std::ostream& operator<<(std::ostream& out, const UnguessableToken& token) { |
| return out << "(" << token.ToString() << ")"; |
| } |
| |
| } // namespace base |