From 6ecea67718803e96e00a18f97ae8abc83ecaa1c2 Mon Sep 17 00:00:00 2001
From: Mark Haines <mark.haines@matrix.org>
Date: Fri, 12 Jun 2015 14:09:41 +0100
Subject: Implement the session key exchange

---
 include/axolotl/crypto.hh | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'include/axolotl/crypto.hh')

diff --git a/include/axolotl/crypto.hh b/include/axolotl/crypto.hh
index 42e4b61..7564e8f 100644
--- a/include/axolotl/crypto.hh
+++ b/include/axolotl/crypto.hh
@@ -12,6 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#ifndef AXOLOTL_CRYPTO_HH_
+#define AXOLOTL_CRYPTO_HH_
+
 #include <cstdint>
 #include <cstddef>
 
@@ -141,3 +144,5 @@ void hkdf_sha256(
 );
 
 } // namespace axolotl
+
+#endif /* AXOLOTL_CRYPTO_HH_ */
-- 
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