Adding C++ KeysetWriter.

Bug: 65688580

Change-Id: Ib80ec35b6c00bb35e7fb482b6dc7b753768b32fa
ORIGINAL_AUTHOR=Bartosz Przydatek <przydatek@google.com>
GitOrigin-RevId: 4f7b6d8915ff8f9f276af4421713efb6c190710d

1 files changed, 55 insertions, 0 deletions

diff --git a/cc/binary_keyset_writer.h b/cc/binary_keyset_writer.h
new file mode 100644
index 000000000..3bc810f5e
--- /dev/null
+++ b/cc/binary_keyset_writer.h
@@ -0,0 +1,55 @@
+// Copyright 2018 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef TINK_BINARY_KEYSET_WRITER_H_
+#define TINK_BINARY_KEYSET_WRITER_H_
+
+#include <ostream>
+
+#include "absl/strings/string_view.h"
+#include "cc/keyset_writer.h"
+#include "cc/util/status.h"
+#include "cc/util/statusor.h"
+#include "proto/tink.pb.h"
+
+namespace crypto {
+namespace tink {
+
+// A KeysetWriter that can write to some destination cleartext
+// or encrypted keysets in proto binary wire format, cf.
+// https://developers.google.com/protocol-buffers/docs/encoding
+class BinaryKeysetWriter : public KeysetWriter {
+ public:
+  static crypto::tink::util::StatusOr<std::unique_ptr<BinaryKeysetWriter>> New(
+      std::unique_ptr<std::ostream> destination_stream);
+
+  crypto::tink::util::Status
+  Write(const google::crypto::tink::Keyset& keyset) override;;
+
+  crypto::tink::util::Status
+  Write(const google::crypto::tink::EncryptedKeyset& encrypted_keyset) override;
+
+ private:
+  BinaryKeysetWriter(std::unique_ptr<std::ostream> destination_stream)
+      : destination_stream_(std::move(destination_stream)) {}
+
+  std::unique_ptr<std::ostream> destination_stream_;
+};
+
+}  // namespace tink
+}  // namespace crypto
+
+#endif  // TINK_BINARY_KEYSET_WRITER_H_