1 files changed, 66 insertions, 0 deletions
diff --git a/src/ext/equix/hashx/src/siphash.c b/src/ext/equix/hashx/src/siphash.c
new file mode 100644
index 0000000000..0acfca8814
--- /dev/null
+++ b/src/ext/equix/hashx/src/siphash.c
@@ -0,0 +1,66 @@
+/* Copyright (c) 2020 tevador <tevador@gmail.com> */
+/* See LICENSE for licensing information */
+
+#include "siphash.h"
+#include "hashx_endian.h"
+#include "unreachable.h"
+
+uint64_t hashx_siphash13_ctr(uint64_t input, const siphash_state* keys) {
+    uint64_t v0 = keys->v0;
+    uint64_t v1 = keys->v1;
+    uint64_t v2 = keys->v2;
+    uint64_t v3 = keys->v3;
+
+    v3 ^= input;
+
+    SIPROUND(v0, v1, v2, v3);
+
+    v0 ^= input;
+    v2 ^= 0xff;
+
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+
+    return (v0 ^ v1) ^ (v2 ^ v3);
+}
+
+void hashx_siphash24_ctr_state512(const siphash_state* keys, uint64_t input,
+    uint64_t state_out[8]) {
+
+    uint64_t v0 = keys->v0;
+    uint64_t v1 = keys->v1;
+    uint64_t v2 = keys->v2;
+    uint64_t v3 = keys->v3;
+
+    v1 ^= 0xee;
+    v3 ^= input;
+
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+
+    v0 ^= input;
+    v2 ^= 0xee;
+
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+
+    state_out[0] = v0;
+    state_out[1] = v1;
+    state_out[2] = v2;
+    state_out[3] = v3;
+
+    v1 ^= 0xdd;
+
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+    SIPROUND(v0, v1, v2, v3);
+
+    state_out[4] = v0;
+    state_out[5] = v1;
+    state_out[6] = v2;
+    state_out[7] = v3;
+}