hash: allow registing with a seed value

Seed value will have to be used by the caller's hash function.

(cherry picked from commit b742d58544)

src/util-hash.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2007-2010 Open Information Security Foundation
+/* Copyright (C) 2007-2026 Open Information Security Foundation
  *
  * You can copy, redistribute or modify this Program under the terms of
  * the GNU General Public License version 2 as published by the Free
@@ -75,6 +75,18 @@ error:
     return NULL;
 }
 
+HashTable *HashTableInitWithSeed(uint32_t size,
+        uint32_t (*Hash)(struct HashTable_ *, void *, uint16_t),
+        char (*Compare)(void *, uint16_t, void *, uint16_t), void (*Free)(void *),
+        const uint32_t seed)
+{
+    HashTable *ht = HashTableInit(size, Hash, Compare, Free);
+    if (ht != NULL) {
+        ht->seed = seed;
+    }
+    return ht;
+}
+
 /**
  *  \brief Free a HashTableBucket and return the next bucket
  *  \param ht Pointer to the HashTable

src/util-hash.h

@@ -35,6 +35,7 @@ typedef struct HashTableBucket_ {
 typedef struct HashTable_ {
     HashTableBucket **array;
     uint32_t array_size;
+    uint32_t seed; /**< optional random seed, to be used by the registered hash function. */
 #ifdef UNITTESTS
     uint32_t count;
 #endif
@@ -47,6 +48,9 @@ typedef struct HashTable_ {
 
 /* prototypes */
 HashTable* HashTableInit(uint32_t, uint32_t (*Hash)(struct HashTable_ *, void *, uint16_t), char (*Compare)(void *, uint16_t, void *, uint16_t), void (*Free)(void *));
+HashTable *HashTableInitWithSeed(uint32_t, uint32_t (*Hash)(struct HashTable_ *, void *, uint16_t),
+        char (*Compare)(void *, uint16_t, void *, uint16_t), void (*Free)(void *),
+        const uint32_t seed);
 void HashTableFree(HashTable *);
 int HashTableAdd(HashTable *, void *, uint16_t);
 int HashTableRemove(HashTable *, void *, uint16_t);