components/gcm_driver/crypto/gcm_encryption_provider.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_GCM_DRIVER_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_
   6 #define COMPONENTS_GCM_DRIVER_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_
   7
   8 #include <stdint.h>
   9 #include <string>
  10
  11 #include "base/callback_forward.h"
  12 #include "base/macros.h"
  13 #include "base/memory/weak_ptr.h"
  14
  15 namespace base {
  16 class FilePath;
  17 class SequencedTaskRunner;
  18 }
  19
  20 namespace gcm {
  21
  22 class GCMKeyStore;
  23 class KeyPair;
  24
  25 // Provider that enables the GCM Driver to deal with encryption key management
  26 // and decryption of incoming messages.
  27 class GCMEncryptionProvider {
  28  public:
  29   // Callback to be invoked when the public encryption key is available.
  30   using PublicKeyCallback = base::Callback<void(const std::string&)>;
  31
  32   GCMEncryptionProvider();
  33   ~GCMEncryptionProvider();
  34
  35   // Initializes the encryption provider with the |store_path| and the
  36   // |blocking_task_runner|. Done separately from the constructor in order to
  37   // avoid needing a blocking task runner for anything using GCMDriver.
  38   void Init(
  39       const base::FilePath& store_path,
  40       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner);
  41
  42   // Retrieves the public encryption key belonging to |app_id|. If no keys have
  43   // been associated with |app_id| yet, they will be created.
  44   void GetPublicKey(const std::string& app_id,
  45                     const PublicKeyCallback& callback);
  46
  47  private:
  48   void DidGetPublicKey(const std::string& app_id,
  49                        const PublicKeyCallback& callback,
  50                        const KeyPair& pair);
  51
  52   void DidCreatePublicKey(const PublicKeyCallback& callback,
  53                           const KeyPair& pair);
  54
  55   scoped_ptr<GCMKeyStore> key_store_;
  56
  57   base::WeakPtrFactory<GCMEncryptionProvider> weak_ptr_factory_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(GCMEncryptionProvider);
  60 };
  61
  62 }  // namespace gcm
  63
  64 #endif  // COMPONENTS_GCM_DRIVER_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_