sync: Add non-blocking type encryption (retry)

sync/util/cryptographer.h

 // Copyright 2012 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 SYNC_UTIL_CRYPTOGRAPHER_H_
 #define SYNC_UTIL_CRYPTOGRAPHER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 158 matching lines @@
   // Cryptographer instance to bootstrap itself.  Returns false if such a token
   // can't be created (i.e. if this Cryptograhper doesn't have valid keys).
   bool GetBootstrapToken(std::string* token) const;
 
   Encryptor* encryptor() const { return encryptor_; }
 
   // Returns true if |keybag| is decryptable and either is a subset of nigoris_
   // and/or has a different default key.
   bool KeybagIsStale(const sync_pb::EncryptedData& keybag) const;
 
+  // Returns the name of the Nigori key currently used for encryption.
+  std::string GetDefaultNigoriKeyName() const;
+
   // Returns a serialized sync_pb::NigoriKey version of current default
   // encryption key.
-  std::string GetDefaultNigoriKey() const;
+  std::string GetDefaultNigoriKeyData() const;
 
   // Generates a new Nigori from |serialized_nigori_key|, and if successful
   // installs the new nigori as the default key.
   bool ImportNigoriKey(const std::string serialized_nigori_key);
 
  private:
   typedef std::map<std::string, linked_ptr<const Nigori> > NigoriMap;
 
   // Helper method to instantiate Nigori instances for each set of key
   // parameters in |bag|.
@@ skipping 16 matching lines @@
   std::string default_nigori_name_;
 
   scoped_ptr<sync_pb::EncryptedData> pending_keys_;
 
   DISALLOW_COPY_AND_ASSIGN(Cryptographer);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_UTIL_CRYPTOGRAPHER_H_