Add Curve25519 version of pairing authenticators

remoting/protocol/negotiating_host_authenticator.h

 // Copyright 2013 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 REMOTING_PROTOCOL_NEGOTIATING_HOST_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_NEGOTIATING_HOST_AUTHENTICATOR_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
 
 class TokenValidatorFactory;
 
 // Host-side implementation of NegotiatingAuthenticatorBase.
 // See comments in negotiating_authenticator_base.h for a general explanation.
 class NegotiatingHostAuthenticator : public NegotiatingAuthenticatorBase {
  public:
   ~NegotiatingHostAuthenticator() override;
 
   // Creates a host authenticator for It2Me host.
-  static scoped_ptr<Authenticator> CreateForIt2Me(
+  static scoped_ptr<NegotiatingHostAuthenticator> CreateForIt2Me(
       const std::string& local_id,
       const std::string& remote_id,
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
       const std::string& access_code);
 
   // Creates a host authenticator, using a fixed PIN. If |pairing_registry| is
   // non-nullptr then the paired methods will be offered, supporting
   // PIN-less authentication.
-  static scoped_ptr<Authenticator> CreateWithPin(
+  static scoped_ptr<NegotiatingHostAuthenticator> CreateWithPin(
       const std::string& local_id,
       const std::string& remote_id,
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
       const std::string& pin_hash,
       scoped_refptr<PairingRegistry> pairing_registry);
 
   // Creates a host authenticator, using third party authentication.
-  static scoped_ptr<Authenticator> CreateWithThirdPartyAuth(
+  static scoped_ptr<NegotiatingHostAuthenticator> CreateWithThirdPartyAuth(
       const std::string& local_id,
       const std::string& remote_id,
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
       scoped_refptr<TokenValidatorFactory> token_validator_factory);
 
   // Overriden from Authenticator.
   void ProcessMessage(const buzz::XmlElement* message,
                       const base::Closure& resume_callback) override;
   scoped_ptr<buzz::XmlElement> GetNextMessage() override;
@@ skipping 27 matching lines @@
 
   std::string client_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NegotiatingHostAuthenticator);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_NEGOTIATING_HOST_AUTHENTICATOR_H_