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content / public / common / pseudonymization_util.h [blame]
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_PUBLIC_COMMON_PSEUDONYMIZATION_UTIL_H_
#define CONTENT_PUBLIC_COMMON_PSEUDONYMIZATION_UTIL_H_
#include <string_view>
#include "content/common/content_export.h"
#include "stdint.h"
// Forward-declarations of classes approved for using the PseudonymizationUtil.
//
// The declarations below might violate to some extent the layering (forcing us
// to name classes declared in higher-layers, above the //content layer). This
// is okay, because:
// 1. These are only forward-declarations
// 2. The benefit of the forward-declarations (mechanically forcing privacy
// review for new users of PseudonymizationUtil) seems to outweigh the
// layering concerns.
// 3. There is a precedent for such layering-violating-friends-usage in
// base::ScopedAllowBlocking.
namespace extensions {
class ExtensionIdForTracing;
} // namespace extensions
namespace content {
class CONTENT_EXPORT PseudonymizationUtil {
public:
// This is a test only interface that is identical to the public interface,
// but does not require friending.
static uint32_t PseudonymizeStringForTesting(std::string_view string);
private:
// Pseudonymizes the input `string` by passing it through a one-way hash
// function (e.g. SHA1) and salting with an pseudonymization salt (randomly
// generated once per Chrome session and thrown away - never persisted or sent
// to a server).
//
// The same input `string` value will be translated into the same
// pseudonymized uint32_t value, as long as PseudonymizeString is called
// within the same Chromium session. This is true even across processes (e.g.
// the same pseudonymization result will be produced in the Browser process
// and Renderer processes).
//
// This method is thread-safe - it can be called on any thread.
static uint32_t PseudonymizeString(std::string_view string);
// NOTE: All usages of the PseudonymizationUtil class should be reviewed by
// chrome-privacy-core@google.com (and when approved added to the friend list
// below).
friend class extensions::ExtensionIdForTracing;
};
} // namespace content
#endif // CONTENT_PUBLIC_COMMON_PSEUDONYMIZATION_UTIL_H_