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diff --git a/brillo/cryptohome.h b/brillo/cryptohome.h
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+// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBCHROMEOS_BRILLO_CRYPTOHOME_H_
+#define LIBCHROMEOS_BRILLO_CRYPTOHOME_H_
+
+#include <string>
+
+#include <base/files/file_path.h>
+#include <brillo/brillo_export.h>
+
+namespace brillo {
+namespace cryptohome {
+namespace home {
+
+BRILLO_EXPORT extern const char kGuestUserName[];
+
+// Returns the common prefix under which the mount points for user homes are
+// created.
+BRILLO_EXPORT base::FilePath GetUserPathPrefix();
+
+// Returns the common prefix under which the mount points for root homes are
+// created.
+BRILLO_EXPORT base::FilePath GetRootPathPrefix();
+
+// Returns the path at which the user home for |username| will be mounted.
+// Returns "" for failures.
+BRILLO_EXPORT base::FilePath GetUserPath(const std::string& username);
+
+// Returns the path at which the user home for |hashed_username| will be
+// mounted. Useful when you already have the username hashed.
+// Returns "" for failures.
+BRILLO_EXPORT base::FilePath GetHashedUserPath(
+    const std::string& hashed_username);
+
+// Returns the path at which the root home for |username| will be mounted.
+// Returns "" for failures.
+BRILLO_EXPORT base::FilePath GetRootPath(const std::string& username);
+
+// Returns the path at which the daemon |daemon| should store per-user data.
+BRILLO_EXPORT base::FilePath GetDaemonPath(const std::string& username,
+                                           const std::string& daemon);
+
+// Checks whether |sanitized| has the format of a sanitized username.
+BRILLO_EXPORT bool IsSanitizedUserName(const std::string& sanitized);
+
+// Returns a sanitized form of |username|. For x != y, SanitizeUserName(x) !=
+// SanitizeUserName(y).
+BRILLO_EXPORT std::string SanitizeUserName(const std::string& username);
+
+// Overrides the common prefix under which the mount points for user homes are
+// created. This is used for testing only.
+BRILLO_EXPORT void SetUserHomePrefix(const std::string& prefix);
+
+// Overrides the common prefix under which the mount points for root homes are
+// created. This is used for testing only.
+BRILLO_EXPORT void SetRootHomePrefix(const std::string& prefix);
+
+// Overrides the contents of the system salt.
+// salt should be non-NULL and non-empty when attempting to avoid filesystem
+// usage in tests.
+// Note:
+// (1) Never mix usage with SetSystemSaltPath().
+// (2) Ownership of the pointer stays with the caller.
+BRILLO_EXPORT void SetSystemSalt(std::string* salt);
+
+// Returns the system salt.
+BRILLO_EXPORT std::string* GetSystemSalt();
+
+}  // namespace home
+}  // namespace cryptohome
+}  // namespace brillo
+
+#endif  // LIBCHROMEOS_BRILLO_CRYPTOHOME_H_