Introduce networking.cast API

extensions/browser/api/networking_cast/networking_cast_delegate.h

+// Copyright 2017 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 EXTENSIONS_BROWSER_API_NETWORKING_CAST_NETWORKING_CAST_DELEGATE_H_
+#define EXTENSIONS_BROWSER_API_NETWORKING_CAST_NETWORKING_CAST_DELEGATE_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "extensions/common/api/networking_cast.h"
+
+namespace extensions {
+
+// Delegate interface that provides crypto methods needed to verify cast
+// certificates and encrypt data using public key derived from the verified
+// certificate.
+class NetworkingCastDelegate {
+ public:
+  virtual ~NetworkingCastDelegate() {}
+
+  using FailureCallback = base::Callback<void(const std::string& error)>;
+  using VerifiedCallback = base::Callback<void(bool is_valid)>;
+  using DataCallback = base::Callback<void(const std::string& encrypted_data)>;
+
+  // Verifies that data provided in |properties| authenticates a cast device.
+  virtual void VerifyDestination(
+      const api::networking_cast::VerificationProperties& properties,
+      const VerifiedCallback& success_callback,
+      const FailureCallback& failure_callback) = 0;
+
+  // Verifies that data provided in |properties| authenticates a cast device.
+  // If the device is verified as a cast device, it fetches credentials of the
+  // network identified with |network_guid| and returns the network credentials
+  // encrypted with a public key derived from |properties|.
+  virtual void VerifyAndEncryptCredentials(
+      const std::string& network_guid,
+      const api::networking_cast::VerificationProperties& properties,
+      const DataCallback& encrypted_credetials_callback,
+      const FailureCallback& failure_callback) = 0;
+
+  // Verifies that data provided in |properties| authenticates a cast device.
+  // If the device is verified as a cast device, it returns |data| encrypted
+  // with a public key derived from |properties|.
+  virtual void VerifyAndEncryptData(
+      const std::string& data,
+      const api::networking_cast::VerificationProperties& properties,
+      const DataCallback& enrypted_data_callback,
+      const FailureCallback& failure_callback) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_NETWORKING_CAST_NETWORKING_CAST_DELEGATE_H_