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diff --git a/include/ouroboros/crc32.h b/include/ouroboros/crc32.h
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * 32-bit Cyclic Redundancy Check
+ *
+ * Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef OUROBOROS_CRC32_H
+#define OUROBOROS_CRC32_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+void crc32(uint32_t * crc,
+ const void * buf,
+ size_t len);
+
+#endif /* OUROBOROS_CRC32_H */