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diff --git a/client/cpp/libc_rand_impl.h b/client/cpp/libc_rand_impl.h
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+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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.
+
+// A RAPPOR random implementation using libc's rand().
+//
+// IMPORTANT: This is for demo /simulation purposes only.  Use a better random
+// function in production applications.
+
+#ifndef LIBC_RAND_IMPL_H_
+#define LIBC_RAND_IMPL_H_
+
+#include "rappor_deps.h"
+
+namespace rappor {
+
+class LibcRand : public IrrRandInterface {
+ public:
+  virtual ~LibcRand() {}
+
+  virtual bool GetMask(float prob, int num_bits, Bits* mask_out) const;
+};
+
+}  // namespace rappor
+
+#endif  // LIBC_RAND_IMPL_H_