Simplifying KeyManager-interface and adding HmacKeyManager.

Change-Id: I54a686a839e172dfc43c97a8ccb8d059d985ceec
ORIGINAL_AUTHOR=Bartosz Przydatek <przydatek@google.com>
GitOrigin-RevId: 54ad8ce84d88b71ec147f08fc5d40c94769fa690

1 files changed, 84 insertions, 0 deletions

diff --git a/cc/mac/hmac_key_manager.h b/cc/mac/hmac_key_manager.h
new file mode 100644
index 000000000..e3e312077
--- /dev/null
+++ b/cc/mac/hmac_key_manager.h
@@ -0,0 +1,84 @@
+// Copyright 2017 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <algorithm>
+#include <vector>
+
+#ifndef TINK_MAC_HMAC_KEY_MANAGER_H_
+#define TINK_MAC_HMAC_KEY_MANAGER_H_
+
+#include "cc/mac.h"
+#include "cc/key_manager.h"
+#include "cc/util/errors.h"
+#include "cc/util/status.h"
+#include "cc/util/statusor.h"
+#include "google/protobuf/message.h"
+#include "proto/hmac.pb.h"
+#include "proto/tink.pb.h"
+
+namespace cloud {
+namespace crypto {
+namespace tink {
+
+class HmacKeyManager : public KeyManager<Mac> {
+ public:
+  HmacKeyManager() : key_type_(kKeyType) {}
+
+  // Constructs an instance of HMAC-Mac for the given 'key'.
+  util::StatusOr<std::unique_ptr<Mac>> GetPrimitive(
+      const google::cloud::crypto::tink::KeyData& key_data) const override;
+
+  // Constructs an instance of HMAC-Mac for the given 'key'.
+  util::StatusOr<std::unique_ptr<Mac>>
+  GetPrimitive(const google::protobuf::Message& key) const override;
+
+  // Generates a new random HMAC key, based on the specified 'key_template'.
+  util::StatusOr<std::unique_ptr<google::protobuf::Message>> NewKey(
+      const google::cloud::crypto::tink::KeyTemplate& key_template)
+      const override;
+
+  // Returns the type_url identifying the key type handled by this manager.
+  const std::string& get_key_type() const override;
+
+  // Returns the version of this key manager.
+  int get_version() const override;
+
+  virtual ~HmacKeyManager() {}
+
+ private:
+  static constexpr char kKeyTypePrefix[] = "type.googleapis.com/";
+  static constexpr char kKeyType[] =
+      "type.googleapis.com/google.cloud.crypto.tink.HmacKey";
+
+  std::string key_type_;
+
+  // Constructs an instance of HMAC-Mac for the given 'key'.
+  util::StatusOr<std::unique_ptr<Mac>>
+  GetPrimitiveImpl(const google::cloud::crypto::tink::HmacKey& key) const;
+
+  util::Status Validate(
+      const google::cloud::crypto::tink::HmacParams& params) const;
+  util::Status Validate(
+      const google::cloud::crypto::tink::HmacKey& key) const;
+  util::Status Validate(
+      const google::cloud::crypto::tink::HmacKeyFormat& key_format) const;
+};
+
+}  // namespace tink
+}  // namespace crypto
+}  // namespace cloud
+
+#endif  // TINK_MAC_HMAC_KEY_MANAGER_H_