version 5.5.1

add SipHash and HalfSipHash for PIDigest

3rd/SipHash/siphash.h

@@ -0,0 +1,34 @@
+/*
+   SipHash reference C implementation
+
+   Copyright (c) 2012-2021 Jean-Philippe Aumasson
+   <jeanphilippe.aumasson@gmail.com>
+   Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to>
+
+   To the extent possible under law, the author(s) have dedicated all copyright
+   and related and neighboring rights to this software to the public domain
+   worldwide. This software is distributed without any warranty.
+
+   You should have received a copy of the CC0 Public Domain Dedication along
+   with
+   this software. If not, see
+   <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#ifndef SIPHASH_H
+#define SIPHASH_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+int siphash(const void * in, const size_t inlen, const void * k, uint8_t * out, const size_t outlen);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif