6fbd280b35
When using siphash24(), the hash value depends on the hashed input and the key from _get_hash_key(). If the input is static, so is also the result of siphash24(), albeit the bits are scrabbled more. Add a nm_hash_static() to get such a static key, but without actually doing siphash24(). The static key is also xored with a static_seed. For that, also mangle the first byte of the hash key using siphash24() itself. That is, because nm_hash_static() only uses the first guint of the random key. Hence, we want that this first guint has all the entropy of the entire key. We use siphash24() itself, to mangle all bits of the 16 byte key into the first guint.
213 lines
10 KiB
C
213 lines
10 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/* NetworkManager -- Network link manager
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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* (C) Copyright 2017 Red Hat, Inc.
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*/
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#ifndef __NM_HASH_UTILS_H__
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#define __NM_HASH_UTILS_H__
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#include "siphash24.h"
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#include "nm-macros-internal.h"
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struct _NMHashState {
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struct siphash _state;
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};
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typedef struct _NMHashState NMHashState;
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guint nm_hash_static (guint static_seed);
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void nm_hash_init (NMHashState *state, guint static_seed);
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static inline guint
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nm_hash_complete (NMHashState *state)
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{
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guint64 h;
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nm_assert (state);
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h = siphash24_finalize (&state->_state);
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/* we don't ever want to return a zero hash.
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*
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* NMPObject requires that in _idx_obj_part(), and it's just a good idea. */
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return (((guint) (h >> 32)) ^ ((guint) h)) ?: 1396707757u;
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}
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static inline void
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nm_hash_update (NMHashState *state, const void *ptr, gsize n)
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{
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nm_assert (state);
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nm_assert (ptr);
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nm_assert (n > 0);
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siphash24_compress (ptr, n, &state->_state);
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}
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#define nm_hash_update_val(state, val) \
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G_STMT_START { \
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typeof (val) _val = (val); \
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\
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nm_hash_update ((state), &_val, sizeof (_val)); \
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} G_STMT_END
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static inline void
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nm_hash_update_bool (NMHashState *state, bool val)
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{
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nm_hash_update (state, &val, sizeof (val));
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}
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#define _NM_HASH_COMBINE_BOOLS_x_1( t, y) ((y) ? ((t) (1ull << 0)) : ((t) 0ull))
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#define _NM_HASH_COMBINE_BOOLS_x_2( t, y, ...) ((y) ? ((t) (1ull << 1)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_1 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_3( t, y, ...) ((y) ? ((t) (1ull << 2)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_2 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_4( t, y, ...) ((y) ? ((t) (1ull << 3)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_3 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_5( t, y, ...) ((y) ? ((t) (1ull << 4)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_4 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_6( t, y, ...) ((y) ? ((t) (1ull << 5)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_5 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_7( t, y, ...) ((y) ? ((t) (1ull << 6)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_6 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_8( t, y, ...) ((y) ? ((t) (1ull << 7)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_7 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_9( t, y, ...) ((y) ? ((t) (1ull << 8)) : ((t) 0ull)) | (G_STATIC_ASSERT_EXPR (sizeof (t) >= 2), (_NM_HASH_COMBINE_BOOLS_x_8 (t, __VA_ARGS__)))
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#define _NM_HASH_COMBINE_BOOLS_x_10(t, y, ...) ((y) ? ((t) (1ull << 9)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_9 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_x_11(t, y, ...) ((y) ? ((t) (1ull << 10)) : ((t) 0ull)) | _NM_HASH_COMBINE_BOOLS_x_10 (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_n2(t, n, ...) _NM_HASH_COMBINE_BOOLS_x_##n (t, __VA_ARGS__)
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#define _NM_HASH_COMBINE_BOOLS_n(t, n, ...) _NM_HASH_COMBINE_BOOLS_n2(t, n, __VA_ARGS__)
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#define NM_HASH_COMBINE_BOOLS(type, ...) ((type) (_NM_HASH_COMBINE_BOOLS_n(type, NM_NARG (__VA_ARGS__), __VA_ARGS__)))
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#define nm_hash_update_bools(state, ...) \
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nm_hash_update_val (state, NM_HASH_COMBINE_BOOLS (guint8, __VA_ARGS__))
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#define _NM_HASH_COMBINE_VALS_typ_x_1( y) typeof (y) _v1;
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#define _NM_HASH_COMBINE_VALS_typ_x_2( y, ...) typeof (y) _v2; _NM_HASH_COMBINE_VALS_typ_x_1 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_3( y, ...) typeof (y) _v3; _NM_HASH_COMBINE_VALS_typ_x_2 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_4( y, ...) typeof (y) _v4; _NM_HASH_COMBINE_VALS_typ_x_3 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_5( y, ...) typeof (y) _v5; _NM_HASH_COMBINE_VALS_typ_x_4 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_6( y, ...) typeof (y) _v6; _NM_HASH_COMBINE_VALS_typ_x_5 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_7( y, ...) typeof (y) _v7; _NM_HASH_COMBINE_VALS_typ_x_6 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_8( y, ...) typeof (y) _v8; _NM_HASH_COMBINE_VALS_typ_x_7 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_9( y, ...) typeof (y) _v9; _NM_HASH_COMBINE_VALS_typ_x_8 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_10(y, ...) typeof (y) _v10; _NM_HASH_COMBINE_VALS_typ_x_9 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_11(y, ...) typeof (y) _v11; _NM_HASH_COMBINE_VALS_typ_x_10 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_12(y, ...) typeof (y) _v12; _NM_HASH_COMBINE_VALS_typ_x_11 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_13(y, ...) typeof (y) _v13; _NM_HASH_COMBINE_VALS_typ_x_12 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_14(y, ...) typeof (y) _v14; _NM_HASH_COMBINE_VALS_typ_x_13 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_15(y, ...) typeof (y) _v15; _NM_HASH_COMBINE_VALS_typ_x_14 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_16(y, ...) typeof (y) _v16; _NM_HASH_COMBINE_VALS_typ_x_15 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_17(y, ...) typeof (y) _v17; _NM_HASH_COMBINE_VALS_typ_x_16 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_18(y, ...) typeof (y) _v18; _NM_HASH_COMBINE_VALS_typ_x_17 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_19(y, ...) typeof (y) _v19; _NM_HASH_COMBINE_VALS_typ_x_18 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_x_20(y, ...) typeof (y) _v20; _NM_HASH_COMBINE_VALS_typ_x_19 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_n2(n, ...) _NM_HASH_COMBINE_VALS_typ_x_##n (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_typ_n(n, ...) _NM_HASH_COMBINE_VALS_typ_n2(n, __VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_1( y) ._v1 = (y),
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#define _NM_HASH_COMBINE_VALS_val_x_2( y, ...) ._v2 = (y), _NM_HASH_COMBINE_VALS_val_x_1 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_3( y, ...) ._v3 = (y), _NM_HASH_COMBINE_VALS_val_x_2 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_4( y, ...) ._v4 = (y), _NM_HASH_COMBINE_VALS_val_x_3 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_5( y, ...) ._v5 = (y), _NM_HASH_COMBINE_VALS_val_x_4 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_6( y, ...) ._v6 = (y), _NM_HASH_COMBINE_VALS_val_x_5 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_7( y, ...) ._v7 = (y), _NM_HASH_COMBINE_VALS_val_x_6 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_8( y, ...) ._v8 = (y), _NM_HASH_COMBINE_VALS_val_x_7 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_9( y, ...) ._v9 = (y), _NM_HASH_COMBINE_VALS_val_x_8 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_10(y, ...) ._v10 = (y), _NM_HASH_COMBINE_VALS_val_x_9 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_11(y, ...) ._v11 = (y), _NM_HASH_COMBINE_VALS_val_x_10 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_12(y, ...) ._v12 = (y), _NM_HASH_COMBINE_VALS_val_x_11 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_13(y, ...) ._v13 = (y), _NM_HASH_COMBINE_VALS_val_x_12 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_14(y, ...) ._v14 = (y), _NM_HASH_COMBINE_VALS_val_x_13 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_15(y, ...) ._v15 = (y), _NM_HASH_COMBINE_VALS_val_x_14 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_16(y, ...) ._v16 = (y), _NM_HASH_COMBINE_VALS_val_x_15 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_17(y, ...) ._v17 = (y), _NM_HASH_COMBINE_VALS_val_x_16 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_18(y, ...) ._v18 = (y), _NM_HASH_COMBINE_VALS_val_x_17 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_19(y, ...) ._v19 = (y), _NM_HASH_COMBINE_VALS_val_x_18 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_x_20(y, ...) ._v20 = (y), _NM_HASH_COMBINE_VALS_val_x_19 (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_n2(n, ...) _NM_HASH_COMBINE_VALS_val_x_##n (__VA_ARGS__)
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#define _NM_HASH_COMBINE_VALS_val_n(n, ...) _NM_HASH_COMBINE_VALS_val_n2(n, __VA_ARGS__)
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/* NM_HASH_COMBINE_VALS() is faster then nm_hash_update_val() as it combines multiple
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* calls to nm_hash_update() using a packed structure. */
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#define NM_HASH_COMBINE_VALS(var, ...) \
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const struct _nm_packed { \
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_NM_HASH_COMBINE_VALS_typ_n (NM_NARG (__VA_ARGS__), __VA_ARGS__) \
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} var _nm_alignas (guint64) = { \
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_NM_HASH_COMBINE_VALS_val_n (NM_NARG (__VA_ARGS__), __VA_ARGS__) \
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}
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/* nm_hash_update_vals() is faster then nm_hash_update_val() as it combines multiple
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* calls to nm_hash_update() using a packed structure. */
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#define nm_hash_update_vals(state, ...) \
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G_STMT_START { \
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NM_HASH_COMBINE_VALS (_val, __VA_ARGS__); \
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\
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nm_hash_update ((state), &_val, sizeof (_val)); \
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} G_STMT_END
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static inline void
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nm_hash_update_mem (NMHashState *state, const void *ptr, gsize n)
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{
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/* This also hashes the length of the data. That means,
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* hashing two consecutive binary fields (of arbitrary
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* length), will hash differently. That is,
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* [[1,1], []] differs from [[1],[1]].
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*
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* If you have a constant length (sizeof), use nm_hash_update()
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* instead. */
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nm_hash_update (state, &n, sizeof (n));
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if (n > 0)
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siphash24_compress (ptr, n, &state->_state);
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}
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static inline void
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nm_hash_update_str0 (NMHashState *state, const char *str)
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{
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if (str)
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nm_hash_update_mem (state, str, strlen (str));
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else {
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gsize n = G_MAXSIZE;
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nm_hash_update (state, &n, sizeof (n));
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}
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}
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static inline void
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nm_hash_update_str (NMHashState *state, const char *str)
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{
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nm_assert (str);
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nm_hash_update (state, str, strlen (str) + 1);
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}
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#if _NM_CC_SUPPORT_GENERIC
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/* Like nm_hash_update_str(), but restricted to arrays only. nm_hash_update_str() only works
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* with a @str argument that cannot be NULL. If you have a string pointer, that is never NULL, use
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* nm_hash_update() instead. */
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#define nm_hash_update_strarr(state, str) \
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(_Generic (&(str), \
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const char (*) [sizeof (str)]: nm_hash_update_str ((state), (str)), \
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char (*) [sizeof (str)]: nm_hash_update_str ((state), (str))) \
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)
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#else
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#define nm_hash_update_strarr(state, str) nm_hash_update_str ((state), (str))
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#endif
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guint nm_hash_ptr (gconstpointer ptr);
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guint nm_direct_hash (gconstpointer str);
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guint nm_hash_str (const char *str);
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guint nm_str_hash (gconstpointer str);
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#endif /* __NM_HASH_UTILS_H__ */
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