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diff --git a/src/encryption.h b/src/encryption.h
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+/*
+ * Copyright (C) 2014 Matthias P. Braendli
+ *
+ * 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.
+ * -------------------------------------------------------------------
+ */
+/* \brief Helper functions for the ZMQ encryption */
+
+#ifndef _ENCRYPTION_H_
+#define _ENCRYPTION_H_
+
+int readkey(const char* keyfile, char* key);
+
+#define CURVE_KEYLEN 40
+
+#endif
+