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Diffstat (limited to 'shared/nm-glib-aux/nm-hash-utils.c')
-rw-r--r--shared/nm-glib-aux/nm-hash-utils.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/shared/nm-glib-aux/nm-hash-utils.c b/shared/nm-glib-aux/nm-hash-utils.c
deleted file mode 100644
index 29349b1d0d..0000000000
--- a/shared/nm-glib-aux/nm-hash-utils.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2017 Red Hat, Inc.
- */
-
-#include "nm-glib-aux/nm-default-glib-i18n-lib.h"
-
-#include "nm-hash-utils.h"
-
-#include <stdint.h>
-
-#include "nm-shared-utils.h"
-#include "nm-random-utils.h"
-
-/*****************************************************************************/
-
-#define HASH_KEY_SIZE 16u
-#define HASH_KEY_SIZE_GUINT ((HASH_KEY_SIZE + sizeof(guint) - 1) / sizeof(guint))
-
-G_STATIC_ASSERT(sizeof(guint) * HASH_KEY_SIZE_GUINT >= HASH_KEY_SIZE);
-
-static const guint8 *volatile global_seed = NULL;
-
-static const guint8 *
-_get_hash_key_init(void)
-{
- /* the returned hash is aligned to guin64, hence, it is safe
- * to use it as guint* or guint64* pointer. */
- static union {
- guint8 v8[HASH_KEY_SIZE];
- guint _align_as_uint;
- guint32 _align_as_uint32;
- guint64 _align_as_uint64;
- } g_arr;
- const guint8 *g;
-
-again:
- g = g_atomic_pointer_get(&global_seed);
- if (!G_UNLIKELY(g)) {
- static gsize g_lock;
- uint64_t h;
- union {
- guint vuint;
- guint8 v8[HASH_KEY_SIZE];
- guint8 _extra_entropy[3 * HASH_KEY_SIZE];
- } t_arr;
-
- nm_utils_random_bytes(&t_arr, sizeof(t_arr));
-
- /* We only initialize one random hash key. So we can spend some effort
- * of getting this right. For one, we collect more random bytes than
- * necessary.
- *
- * Then, the first guint of the seed should have all the entropy that we could
- * obtain in sizeof(t_arr). For that, siphash(t_arr) and xor the first guint
- * with hash.
- * The first guint is especially interesting for nm_hash_static() below that
- * doesn't use siphash itself. */
- h = c_siphash_hash(t_arr.v8, (const guint8 *) &t_arr, sizeof(t_arr));
- if (sizeof(h) > sizeof(guint))
- t_arr.vuint = t_arr.vuint ^ ((guint)(h & G_MAXUINT)) ^ ((guint)(h >> 32));
- else
- t_arr.vuint = t_arr.vuint ^ ((guint)(h & G_MAXUINT));
-
- if (!g_once_init_enter(&g_lock)) {
- /* lost a race. The random key is already initialized. */
- goto again;
- }
-
- memcpy(g_arr.v8, t_arr.v8, HASH_KEY_SIZE);
- g = g_arr.v8;
- g_atomic_pointer_set(&global_seed, g);
- g_once_init_leave(&g_lock, 1);
- }
-
- nm_assert(g == g_arr.v8);
- return g;
-}
-
-#define _get_hash_key() \
- ({ \
- const guint8 *_g; \
- \
- _g = g_atomic_pointer_get(&global_seed); \
- if (G_UNLIKELY(!_g)) \
- _g = _get_hash_key_init(); \
- _g; \
- })
-
-guint
-nm_hash_static(guint static_seed)
-{
- /* Note that we only xor the static_seed with the first guint of the key.
- *
- * We don't use siphash, which would mix the bits better with _get_hash_key().
- * Note that nm_hash_static() isn't used to hash the static_seed. Instead, it
- * is used to get a unique hash value in a static context. That means, every
- * caller is responsible to choose a static_seed that is sufficiently
- * distinct from all other callers. In other words, static_seed should be a
- * unique constant with good entropy.
- *
- * Note that _get_hash_key_init() already xored the first guint of the
- * key with the siphash of the entire static key. That means, even if
- * we got bad randomness for the first guint, the first guint is also
- * mixed with the randomness of the entire random key.
- *
- * Also, ensure that we don't return zero (like for nm_hash_complete()).
- */
- return ((*((const guint *) _get_hash_key())) ^ static_seed) ?: 3679500967u;
-}
-
-void
-nm_hash_siphash42_init(CSipHash *h, guint static_seed)
-{
- const guint8 *g;
- union {
- guint64 _align_as_uint64;
- guint arr[HASH_KEY_SIZE_GUINT];
- } seed;
-
- nm_assert(h);
-
- g = _get_hash_key();
- memcpy(&seed, g, HASH_KEY_SIZE);
- seed.arr[0] ^= static_seed;
- c_siphash_init(h, (const guint8 *) &seed);
-}
-
-guint
-nm_hash_str(const char *str)
-{
- NMHashState h;
-
- if (!str)
- return nm_hash_static(1867854211u);
- nm_hash_init(&h, 1867854211u);
- nm_hash_update_str(&h, str);
- return nm_hash_complete(&h);
-}
-
-guint
-nm_str_hash(gconstpointer str)
-{
- return nm_hash_str(str);
-}
-
-guint
-nm_hash_ptr(gconstpointer ptr)
-{
- NMHashState h;
-
- if (!ptr)
- return nm_hash_static(2907677551u);
- nm_hash_init(&h, 2907677551u);
- nm_hash_update(&h, &ptr, sizeof(ptr));
- return nm_hash_complete(&h);
-}
-
-guint
-nm_direct_hash(gconstpointer ptr)
-{
- return nm_hash_ptr(ptr);
-}
-
-/*****************************************************************************/
-
-guint
-nm_pstr_hash(gconstpointer p)
-{
- const char *const *s = p;
-
- if (!s)
- return nm_hash_static(101061439u);
- return nm_hash_str(*s);
-}
-
-gboolean
-nm_pstr_equal(gconstpointer a, gconstpointer b)
-{
- const char *const *s1 = a;
- const char *const *s2 = b;
-
- return (s1 == s2) || (s1 && s2 && nm_streq0(*s1, *s2));
-}
-
-guint
-nm_pint_hash(gconstpointer p)
-{
- const int *s = p;
-
- if (!s)
- return nm_hash_static(298377461u);
- return nm_hash_val(1208815757u, *s);
-}
-
-gboolean
-nm_pint_equals(gconstpointer a, gconstpointer b)
-{
- const int *s1 = a;
- const int *s2 = a;
-
- return s1 == s2 || (s1 && s2 && *s1 == *s2);
-}
-
-guint
-nm_pdirect_hash(gconstpointer p)
-{
- const void *const *s = p;
-
- if (!s)
- return nm_hash_static(1852748873u);
- return nm_direct_hash(*s);
-}
-
-gboolean
-nm_pdirect_equal(gconstpointer a, gconstpointer b)
-{
- const void *const *s1 = a;
- const void *const *s2 = b;
-
- return (s1 == s2) || (s1 && s2 && *s1 == *s2);
-}
-
-guint
-nm_ppdirect_hash(gconstpointer p)
-{
- const void *const *const *s = p;
-
- if (!s)
- return nm_hash_static(396534869u);
- if (!*s)
- return nm_hash_static(1476102263u);
- return nm_direct_hash(**s);
-}
-
-gboolean
-nm_ppdirect_equal(gconstpointer a, gconstpointer b)
-{
- const void *const *const *s1 = a;
- const void *const *const *s2 = b;
-
- if (s1 == s2)
- return TRUE;
- if (!s1 || !s2)
- return FALSE;
-
- if (*s1 == *s2)
- return TRUE;
- if (!*s1 || !*s2)
- return FALSE;
-
- return **s1 == **s2;
-}
-
-/*****************************************************************************/
-
-guint
-nm_gbytes_hash(gconstpointer p)
-{
- GBytes * ptr = (GBytes *) p;
- gconstpointer arr;
- gsize len;
-
- arr = g_bytes_get_data(ptr, &len);
- return nm_hash_mem(792701303u, arr, len);
-}
-
-guint
-nm_pgbytes_hash(gconstpointer p)
-{
- GBytes *const *ptr = p;
- gconstpointer arr;
- gsize len;
-
- arr = g_bytes_get_data(*ptr, &len);
- return nm_hash_mem(1470631313u, arr, len);
-}
-
-gboolean
-nm_pgbytes_equal(gconstpointer a, gconstpointer b)
-{
- GBytes *const *ptr_a = a;
- GBytes *const *ptr_b = b;
-
- return g_bytes_equal(*ptr_a, *ptr_b);
-}
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