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// 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
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