1 files changed, 100 insertions, 0 deletions

diff --git a/lib/libtle_l4p/halfsiphash.h b/lib/libtle_l4p/halfsiphash.h
new file mode 100644
index 0000000..e8e21e4
--- /dev/null
+++ b/lib/libtle_l4p/halfsiphash.h
@@ -0,0 +1,100 @@
+/*
+ * SipHash reference C implementation
+
+ * Copyright (c) 2016 Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
+
+ * 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_
+#define _SIPHASH_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The below siphash logic is taken from the source
+ * https://github.com/veorq/SipHash
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <rte_debug.h>
+
+#define STATE_V2 0x6c796765
+#define STATE_V3 0x74656462
+
+#define ROTL(x, b) (uint32_t)(((x) << (b)) | ((x) >> (32 - (b))))
+
+/*
+ * Siphash hash functionality logically divided into different
+ * phases and the functions are named based on the same.
+ * SipHash-2-4 is used i.e: 2 compression rounds and 4 finalization rounds.
+ */
+static inline void
+sipround(rte_xmm_t *v)
+{
+	v->u32[0] += v->u32[1];
+	v->u32[1] = ROTL(v->u32[1], 5);
+	v->u32[1] ^= v->u32[0];
+	v->u32[0] = ROTL(v->u32[0], 16);
+	v->u32[2] += v->u32[3];
+	v->u32[3] = ROTL(v->u32[3], 8);
+	v->u32[3] ^= v->u32[2];
+	v->u32[0] += v->u32[3];
+	v->u32[3] = ROTL(v->u32[3], 7);
+	v->u32[3] ^= v->u32[0];
+	v->u32[2] += v->u32[1];
+	v->u32[1] = ROTL(v->u32[1], 13);
+	v->u32[1] ^= v->u32[2];
+	v->u32[2] = ROTL(v->u32[2], 16);
+}
+
+static inline void
+siphash_initialization(rte_xmm_t *v, const rte_xmm_t *k)
+{
+	uint32_t k0 = k->u32[0];
+	uint32_t k1 = k->u32[1];
+
+	v->u32[0] = k0;
+	v->u32[1] = k1;
+	v->u32[2] = STATE_V2 ^ k0;
+	v->u32[3] = STATE_V3 ^ k1;
+}
+
+static inline void
+siphash_compression(const uint32_t *in, size_t len, rte_xmm_t *v)
+{
+	uint32_t i;
+
+	for (i = 0; i < len; i++) {
+		v->u32[3] ^= in[i];
+		sipround(v);
+		sipround(v);
+		v->u32[0] ^= in[i];
+	}
+}
+
+static inline void
+siphash_finalization(rte_xmm_t *v)
+{
+	v->u32[2] ^= 0xff;
+	sipround(v);
+	sipround(v);
+	sipround(v);
+	sipround(v);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SIPHASH__ */