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diff --git a/src/openpgp/s_expression.h b/src/openpgp/s_expression.h
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+// Copyright (c) 2020, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <algorithm>
+#include <stdexcept>
+
+#include <gcrypt.h>
+
+namespace openpgp
+{
+
+class s_expression
+{
+public:
+  s_expression(const s_expression &) = delete;
+  s_expression &operator=(const s_expression &) = delete;
+
+  template <typename... Args>
+  s_expression(Args... args)
+  {
+    if (gcry_sexp_build(&data, nullptr, args...) != GPG_ERR_NO_ERROR)
+    {
+      throw std::runtime_error("failed to build S-expression");
+    }
+  }
+
+  s_expression(s_expression &&other)
+  {
+    std::swap(data, other.data);
+  }
+
+  s_expression(gcry_sexp_t data)
+    : data(data)
+  {
+  }
+
+  ~s_expression()
+  {
+    gcry_sexp_release(data);
+  }
+
+  const gcry_sexp_t &get() const
+  {
+    return data;
+  }
+
+private:
+  gcry_sexp_t data = nullptr;
+};
+
+} // namespace openpgp