[Athena] Extract Chrome OS authentication stack

chromeos/login/auth/key.h

 // Copyright 2014 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.
 
-#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_AUTH_KEY_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_AUTH_KEY_H_
+#ifndef CHROMEOS_LOGIN_AUTH_KEY_H_
+#define CHROMEOS_LOGIN_AUTH_KEY_H_
 
 #include <string>
 
+#include "chromeos/chromeos_export.h"
+
 namespace chromeos {
 
 // Key for user authentication. The class supports hashing of plain text
 // passwords to generate keys as well as the use of pre-hashed keys.
-class Key {
+class CHROMEOS_EXPORT Key {
  public:
   enum KeyType {
     // Plain text password.
     KEY_TYPE_PASSWORD_PLAIN,
     // SHA256 of salt + password, first half only, lower-case hex encoded.
     KEY_TYPE_SALTED_SHA256_TOP_HALF,
     // PBKDF2 with 256 bit AES and 1234 iterations, base64 encoded.
     KEY_TYPE_SALTED_PBKDF2_AES256_1234,
   };
 
@@ skipping 17 matching lines @@
 
  private:
   KeyType key_type_;
   std::string salt_;
   std::string secret_;
   std::string label_;
 };
 
 }  // namespace chromeos
 
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_AUTH_KEY_H_
+#endif  // CHROMEOS_LOGIN_AUTH_KEY_H_