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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/unguessable_token.h"
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#include "base/format_macros.h"
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#include "base/no_destructor.h"
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#include "base/rand_util.h"
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#include "base/strings/stringprintf.h"
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namespace base {
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UnguessableToken::UnguessableToken(uint64_t high, uint64_t low)
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: high_(high), low_(low) {}
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std::string UnguessableToken::ToString() const {
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return base::StringPrintf("%016" PRIX64 "%016" PRIX64, high_, low_);
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}
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// static
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UnguessableToken UnguessableToken::Create() {
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UnguessableToken token;
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// Use base::RandBytes instead of crypto::RandBytes, because crypto calls the
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// base version directly, and to prevent the dependency from base/ to crypto/.
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base::RandBytes(&token, sizeof(token));
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return token;
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}
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// static
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const UnguessableToken& UnguessableToken::Null() {
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static const NoDestructor<UnguessableToken> null_token;
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return *null_token;
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}
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// static
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UnguessableToken UnguessableToken::Deserialize(uint64_t high, uint64_t low) {
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// Receiving a zeroed out UnguessableToken from another process means that it
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// was never initialized via Create(). Treat this case as a security issue.
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DCHECK(!(high == 0 && low == 0));
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return UnguessableToken(high, low);
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}
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std::ostream& operator<<(std::ostream& out, const UnguessableToken& token) {
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return out << "(" << token.ToString() << ")";
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}
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} // namespace base
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