From bca2e720ad6d1e7e4dff26a6639a7f9d61c47409 Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Sun, 30 Aug 2026 23:56:50 +0100
Subject: [PATCH] Add Murmur3 validation

---
 src/base/hash/hasher/murmur3.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/base/hash/hasher/murmur3.c b/src/base/hash/hasher/murmur3.c
index fc4985c..afe7426 100644
--- a/src/base/hash/hasher/murmur3.c
+++ b/src/base/hash/hasher/murmur3.c
@@ -2,14 +2,17 @@
 
 #include "murmur3.h"
 #include "../../../common/aliases/aliases.h"
+#include "../../../common/assert/assert.h"
 #include "../../../common/misc/misc_utils.h"
 
 #define _bigConstant(x) (x##LLU)
 
-wp_intern inline u64 fmix64(u64 k);
+wp_intern inline void _validateIO(const WpMur3HasherIO *io);
+wp_intern inline u64 _fmix64(u64 k);
 
 void wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io) {
 	WpMur3HasherIO *io = (WpMur3HasherIO *)hasher_io;
+	_validateIO(io);
 
 	const i32 nblocks = (bytes->count * bytes->item_size) / 16;
 
@@ -84,8 +87,8 @@ void wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io) {
 	h1 += h2;
 	h2 += h1;
 
-	h1 = fmix64(h1);
-	h2 = fmix64(h2);
+	h1 = _fmix64(h1);
+	h2 = _fmix64(h2);
 
 	h1 += h2;
 	h2 += h1;
@@ -94,7 +97,11 @@ void wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io) {
 	io->hash[1] = h2;
 }
 
-wp_intern inline u64 fmix64(u64 k) {
+wp_intern inline void _validateIO(const WpMur3HasherIO *io) {
+	wpRuntimeAssert(io->magic == WP_MUR3_HASHER_MAGIC, "Invalid Murmur3 hash IO");
+}
+
+wp_intern inline u64 _fmix64(u64 k) {
 	k ^= k >> 33;
 	k *= _bigConstant(0xff51afd7ed558ccd);
 	k ^= k >> 33;