PairingAuthenticator implementation and plumbing.

remoting/protocol/negotiating_host_authenticator.h

Index: remoting/protocol/negotiating_host_authenticator.h
diff --git a/remoting/protocol/negotiating_host_authenticator.h b/remoting/protocol/negotiating_host_authenticator.h
index 588fee2bf0e390bdb640bfb801cd15337a9712d3..68ff251a85ad8888e67f9d18ce2a62c07de86cb3 100644
--- a/remoting/protocol/negotiating_host_authenticator.h
+++ b/remoting/protocol/negotiating_host_authenticator.h
@@ -11,10 +11,10 @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
 #include "remoting/protocol/authentication_method.h"
 #include "remoting/protocol/authenticator.h"
 #include "remoting/protocol/negotiating_authenticator_base.h"
+#include "remoting/protocol/pairing_registry.h"
 #include "remoting/protocol/third_party_host_authenticator.h"
 
 namespace remoting {
@@ -30,11 +30,15 @@ class NegotiatingHostAuthenticator : public NegotiatingAuthenticatorBase {
   virtual ~NegotiatingHostAuthenticator();
 
   // Creates a host authenticator, using a fixed shared secret/PIN hash.
+  // If a pairing registry is provided, then it will support the SpakePair
+  // authentication for PIN-less authentication; to disable this, pass a
+  // NULL pairing registry.
   static scoped_ptr<Authenticator> CreateWithSharedSecret(
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
       const std::string& shared_secret_hash,
-      AuthenticationMethod::HashFunction hash_function);
+      AuthenticationMethod::HashFunction hash_function,
+      scoped_refptr<PairingRegistry> pairing_registry);
 
   // Creates a host authenticator, using third party authentication.
   static scoped_ptr<Authenticator> CreateWithThirdPartyAuth(
@@ -68,6 +72,9 @@ class NegotiatingHostAuthenticator : public NegotiatingAuthenticatorBase {
   // Used only for third party host authenticators.
   scoped_ptr<ThirdPartyHostAuthenticator::TokenValidator> token_validator_;
 
+  // Used only for pairing authenticators.
+  scoped_refptr<PairingRegistry> pairing_registry_;
+
   DISALLOW_COPY_AND_ASSIGN(NegotiatingHostAuthenticator);
 };