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diff --git a/include/haproxy/hash.h b/include/haproxy/hash.h
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+/*
+ * include/haproxy/hash.h
+ * Macros for different hashing function.
+ *
+ * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * 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 _HAPROXY_HASH_H_
+#define _HAPROXY_HASH_H_
+
+#include <inttypes.h>
+
+unsigned int hash_djb2(const void *input, int len);
+unsigned int hash_wt6(const void *input, int len);
+unsigned int hash_sdbm(const void *input, int len);
+unsigned int hash_crc32(const void *input, int len);
+uint32_t hash_crc32c(const void *input, int len);
+
+#endif /* _HAPROXY_HASH_H_ */