diff --git a/rtcore.h b/rtcore.h
index e160e5d..1e95491 100644
--- a/rtcore.h
+++ b/rtcore.h
@@ -214,6 +214,9 @@ enum
 
 RTC_API void *ArenaAlloc(arena *a, isize size, isize align, isize n, int flags);
 
+/* Compute a simple, non-cryptographic hash */
+RTC_API u64 SimpleHash(byte *data, isize len);
+
 /* String type */
 typedef struct s8
 {
@@ -485,6 +488,16 @@ ArenaAlloc(arena *a, isize size, isize align, isize n, int flags)
 	return (flags & ALLOC_NOZERO) ? p : memset(p, 0, n * size);
 }
 
+/* Basic hash */
+RTC_API u64
+SimpleHash(byte *data, isize len)
+{
+	u64 hash = 0xcbf29ce484222325;
+	for (isize i = 0; i < len; ++i)
+		hash = (hash ^ (u8)data[i]) * 0x00000100000001b3;
+	return hash;
+}
+
 /* S8 funcs */
 RTC_API s8
 S8Span(u8 *begin, u8 *end)