LCOV - code coverage report
Current view: top level - lib - siphash.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 145 0.0 %
Date: 2023-07-19 18:55:55 Functions: 0 14 0.0 %

          Line data    Source code
       1             : // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
       2             : /* Copyright (C) 2016-2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
       3             :  *
       4             :  * SipHash: a fast short-input PRF
       5             :  * https://131002.net/siphash/
       6             :  *
       7             :  * This implementation is specifically for SipHash2-4 for a secure PRF
       8             :  * and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
       9             :  * hashtables.
      10             :  */
      11             : 
      12             : #include <linux/siphash.h>
      13             : #include <asm/unaligned.h>
      14             : 
      15             : #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
      16             : #include <linux/dcache.h>
      17             : #include <asm/word-at-a-time.h>
      18             : #endif
      19             : 
      20             : #define SIPROUND SIPHASH_PERMUTATION(v0, v1, v2, v3)
      21             : 
      22             : #define PREAMBLE(len) \
      23             :         u64 v0 = SIPHASH_CONST_0; \
      24             :         u64 v1 = SIPHASH_CONST_1; \
      25             :         u64 v2 = SIPHASH_CONST_2; \
      26             :         u64 v3 = SIPHASH_CONST_3; \
      27             :         u64 b = ((u64)(len)) << 56; \
      28             :         v3 ^= key->key[1]; \
      29             :         v2 ^= key->key[0]; \
      30             :         v1 ^= key->key[1]; \
      31             :         v0 ^= key->key[0];
      32             : 
      33             : #define POSTAMBLE \
      34             :         v3 ^= b; \
      35             :         SIPROUND; \
      36             :         SIPROUND; \
      37             :         v0 ^= b; \
      38             :         v2 ^= 0xff; \
      39             :         SIPROUND; \
      40             :         SIPROUND; \
      41             :         SIPROUND; \
      42             :         SIPROUND; \
      43             :         return (v0 ^ v1) ^ (v2 ^ v3);
      44             : 
      45             : #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
      46           0 : u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t *key)
      47             : {
      48           0 :         const u8 *end = data + len - (len % sizeof(u64));
      49           0 :         const u8 left = len & (sizeof(u64) - 1);
      50             :         u64 m;
      51           0 :         PREAMBLE(len)
      52           0 :         for (; data != end; data += sizeof(u64)) {
      53           0 :                 m = le64_to_cpup(data);
      54           0 :                 v3 ^= m;
      55           0 :                 SIPROUND;
      56           0 :                 SIPROUND;
      57           0 :                 v0 ^= m;
      58             :         }
      59             : #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
      60           0 :         if (left)
      61           0 :                 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
      62             :                                                   bytemask_from_count(left)));
      63             : #else
      64             :         switch (left) {
      65             :         case 7: b |= ((u64)end[6]) << 48; fallthrough;
      66             :         case 6: b |= ((u64)end[5]) << 40; fallthrough;
      67             :         case 5: b |= ((u64)end[4]) << 32; fallthrough;
      68             :         case 4: b |= le32_to_cpup(data); break;
      69             :         case 3: b |= ((u64)end[2]) << 16; fallthrough;
      70             :         case 2: b |= le16_to_cpup(data); break;
      71             :         case 1: b |= end[0];
      72             :         }
      73             : #endif
      74           0 :         POSTAMBLE
      75             : }
      76             : EXPORT_SYMBOL(__siphash_aligned);
      77             : #endif
      78             : 
      79           0 : u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t *key)
      80             : {
      81           0 :         const u8 *end = data + len - (len % sizeof(u64));
      82           0 :         const u8 left = len & (sizeof(u64) - 1);
      83             :         u64 m;
      84           0 :         PREAMBLE(len)
      85           0 :         for (; data != end; data += sizeof(u64)) {
      86           0 :                 m = get_unaligned_le64(data);
      87           0 :                 v3 ^= m;
      88           0 :                 SIPROUND;
      89           0 :                 SIPROUND;
      90           0 :                 v0 ^= m;
      91             :         }
      92             : #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
      93           0 :         if (left)
      94           0 :                 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
      95             :                                                   bytemask_from_count(left)));
      96             : #else
      97             :         switch (left) {
      98             :         case 7: b |= ((u64)end[6]) << 48; fallthrough;
      99             :         case 6: b |= ((u64)end[5]) << 40; fallthrough;
     100             :         case 5: b |= ((u64)end[4]) << 32; fallthrough;
     101             :         case 4: b |= get_unaligned_le32(end); break;
     102             :         case 3: b |= ((u64)end[2]) << 16; fallthrough;
     103             :         case 2: b |= get_unaligned_le16(end); break;
     104             :         case 1: b |= end[0];
     105             :         }
     106             : #endif
     107           0 :         POSTAMBLE
     108             : }
     109             : EXPORT_SYMBOL(__siphash_unaligned);
     110             : 
     111             : /**
     112             :  * siphash_1u64 - compute 64-bit siphash PRF value of a u64
     113             :  * @first: first u64
     114             :  * @key: the siphash key
     115             :  */
     116           0 : u64 siphash_1u64(const u64 first, const siphash_key_t *key)
     117             : {
     118           0 :         PREAMBLE(8)
     119           0 :         v3 ^= first;
     120           0 :         SIPROUND;
     121           0 :         SIPROUND;
     122           0 :         v0 ^= first;
     123           0 :         POSTAMBLE
     124             : }
     125             : EXPORT_SYMBOL(siphash_1u64);
     126             : 
     127             : /**
     128             :  * siphash_2u64 - compute 64-bit siphash PRF value of 2 u64
     129             :  * @first: first u64
     130             :  * @second: second u64
     131             :  * @key: the siphash key
     132             :  */
     133           0 : u64 siphash_2u64(const u64 first, const u64 second, const siphash_key_t *key)
     134             : {
     135           0 :         PREAMBLE(16)
     136           0 :         v3 ^= first;
     137           0 :         SIPROUND;
     138           0 :         SIPROUND;
     139           0 :         v0 ^= first;
     140           0 :         v3 ^= second;
     141           0 :         SIPROUND;
     142           0 :         SIPROUND;
     143           0 :         v0 ^= second;
     144           0 :         POSTAMBLE
     145             : }
     146             : EXPORT_SYMBOL(siphash_2u64);
     147             : 
     148             : /**
     149             :  * siphash_3u64 - compute 64-bit siphash PRF value of 3 u64
     150             :  * @first: first u64
     151             :  * @second: second u64
     152             :  * @third: third u64
     153             :  * @key: the siphash key
     154             :  */
     155           0 : u64 siphash_3u64(const u64 first, const u64 second, const u64 third,
     156             :                  const siphash_key_t *key)
     157             : {
     158           0 :         PREAMBLE(24)
     159           0 :         v3 ^= first;
     160           0 :         SIPROUND;
     161           0 :         SIPROUND;
     162           0 :         v0 ^= first;
     163           0 :         v3 ^= second;
     164           0 :         SIPROUND;
     165           0 :         SIPROUND;
     166           0 :         v0 ^= second;
     167           0 :         v3 ^= third;
     168           0 :         SIPROUND;
     169           0 :         SIPROUND;
     170           0 :         v0 ^= third;
     171           0 :         POSTAMBLE
     172             : }
     173             : EXPORT_SYMBOL(siphash_3u64);
     174             : 
     175             : /**
     176             :  * siphash_4u64 - compute 64-bit siphash PRF value of 4 u64
     177             :  * @first: first u64
     178             :  * @second: second u64
     179             :  * @third: third u64
     180             :  * @forth: forth u64
     181             :  * @key: the siphash key
     182             :  */
     183           0 : u64 siphash_4u64(const u64 first, const u64 second, const u64 third,
     184             :                  const u64 forth, const siphash_key_t *key)
     185             : {
     186           0 :         PREAMBLE(32)
     187           0 :         v3 ^= first;
     188           0 :         SIPROUND;
     189           0 :         SIPROUND;
     190           0 :         v0 ^= first;
     191           0 :         v3 ^= second;
     192           0 :         SIPROUND;
     193           0 :         SIPROUND;
     194           0 :         v0 ^= second;
     195           0 :         v3 ^= third;
     196           0 :         SIPROUND;
     197           0 :         SIPROUND;
     198           0 :         v0 ^= third;
     199           0 :         v3 ^= forth;
     200           0 :         SIPROUND;
     201           0 :         SIPROUND;
     202           0 :         v0 ^= forth;
     203           0 :         POSTAMBLE
     204             : }
     205             : EXPORT_SYMBOL(siphash_4u64);
     206             : 
     207           0 : u64 siphash_1u32(const u32 first, const siphash_key_t *key)
     208             : {
     209           0 :         PREAMBLE(4)
     210           0 :         b |= first;
     211           0 :         POSTAMBLE
     212             : }
     213             : EXPORT_SYMBOL(siphash_1u32);
     214             : 
     215           0 : u64 siphash_3u32(const u32 first, const u32 second, const u32 third,
     216             :                  const siphash_key_t *key)
     217             : {
     218           0 :         u64 combined = (u64)second << 32 | first;
     219           0 :         PREAMBLE(12)
     220           0 :         v3 ^= combined;
     221           0 :         SIPROUND;
     222           0 :         SIPROUND;
     223           0 :         v0 ^= combined;
     224           0 :         b |= third;
     225           0 :         POSTAMBLE
     226             : }
     227             : EXPORT_SYMBOL(siphash_3u32);
     228             : 
     229             : #if BITS_PER_LONG == 64
     230             : /* Note that on 64-bit, we make HalfSipHash1-3 actually be SipHash1-3, for
     231             :  * performance reasons. On 32-bit, below, we actually implement HalfSipHash1-3.
     232             :  */
     233             : 
     234             : #define HSIPROUND SIPROUND
     235             : #define HPREAMBLE(len) PREAMBLE(len)
     236             : #define HPOSTAMBLE \
     237             :         v3 ^= b; \
     238             :         HSIPROUND; \
     239             :         v0 ^= b; \
     240             :         v2 ^= 0xff; \
     241             :         HSIPROUND; \
     242             :         HSIPROUND; \
     243             :         HSIPROUND; \
     244             :         return (v0 ^ v1) ^ (v2 ^ v3);
     245             : 
     246             : #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
     247           0 : u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key)
     248             : {
     249           0 :         const u8 *end = data + len - (len % sizeof(u64));
     250           0 :         const u8 left = len & (sizeof(u64) - 1);
     251             :         u64 m;
     252           0 :         HPREAMBLE(len)
     253           0 :         for (; data != end; data += sizeof(u64)) {
     254           0 :                 m = le64_to_cpup(data);
     255           0 :                 v3 ^= m;
     256           0 :                 HSIPROUND;
     257           0 :                 v0 ^= m;
     258             :         }
     259             : #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
     260           0 :         if (left)
     261           0 :                 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
     262             :                                                   bytemask_from_count(left)));
     263             : #else
     264             :         switch (left) {
     265             :         case 7: b |= ((u64)end[6]) << 48; fallthrough;
     266             :         case 6: b |= ((u64)end[5]) << 40; fallthrough;
     267             :         case 5: b |= ((u64)end[4]) << 32; fallthrough;
     268             :         case 4: b |= le32_to_cpup(data); break;
     269             :         case 3: b |= ((u64)end[2]) << 16; fallthrough;
     270             :         case 2: b |= le16_to_cpup(data); break;
     271             :         case 1: b |= end[0];
     272             :         }
     273             : #endif
     274           0 :         HPOSTAMBLE
     275             : }
     276             : EXPORT_SYMBOL(__hsiphash_aligned);
     277             : #endif
     278             : 
     279           0 : u32 __hsiphash_unaligned(const void *data, size_t len,
     280             :                          const hsiphash_key_t *key)
     281             : {
     282           0 :         const u8 *end = data + len - (len % sizeof(u64));
     283           0 :         const u8 left = len & (sizeof(u64) - 1);
     284             :         u64 m;
     285           0 :         HPREAMBLE(len)
     286           0 :         for (; data != end; data += sizeof(u64)) {
     287           0 :                 m = get_unaligned_le64(data);
     288           0 :                 v3 ^= m;
     289           0 :                 HSIPROUND;
     290           0 :                 v0 ^= m;
     291             :         }
     292             : #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
     293           0 :         if (left)
     294           0 :                 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
     295             :                                                   bytemask_from_count(left)));
     296             : #else
     297             :         switch (left) {
     298             :         case 7: b |= ((u64)end[6]) << 48; fallthrough;
     299             :         case 6: b |= ((u64)end[5]) << 40; fallthrough;
     300             :         case 5: b |= ((u64)end[4]) << 32; fallthrough;
     301             :         case 4: b |= get_unaligned_le32(end); break;
     302             :         case 3: b |= ((u64)end[2]) << 16; fallthrough;
     303             :         case 2: b |= get_unaligned_le16(end); break;
     304             :         case 1: b |= end[0];
     305             :         }
     306             : #endif
     307           0 :         HPOSTAMBLE
     308             : }
     309             : EXPORT_SYMBOL(__hsiphash_unaligned);
     310             : 
     311             : /**
     312             :  * hsiphash_1u32 - compute 64-bit hsiphash PRF value of a u32
     313             :  * @first: first u32
     314             :  * @key: the hsiphash key
     315             :  */
     316           0 : u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
     317             : {
     318           0 :         HPREAMBLE(4)
     319           0 :         b |= first;
     320           0 :         HPOSTAMBLE
     321             : }
     322             : EXPORT_SYMBOL(hsiphash_1u32);
     323             : 
     324             : /**
     325             :  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
     326             :  * @first: first u32
     327             :  * @second: second u32
     328             :  * @key: the hsiphash key
     329             :  */
     330           0 : u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
     331             : {
     332           0 :         u64 combined = (u64)second << 32 | first;
     333           0 :         HPREAMBLE(8)
     334           0 :         v3 ^= combined;
     335           0 :         HSIPROUND;
     336           0 :         v0 ^= combined;
     337           0 :         HPOSTAMBLE
     338             : }
     339             : EXPORT_SYMBOL(hsiphash_2u32);
     340             : 
     341             : /**
     342             :  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
     343             :  * @first: first u32
     344             :  * @second: second u32
     345             :  * @third: third u32
     346             :  * @key: the hsiphash key
     347             :  */
     348           0 : u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
     349             :                   const hsiphash_key_t *key)
     350             : {
     351           0 :         u64 combined = (u64)second << 32 | first;
     352           0 :         HPREAMBLE(12)
     353           0 :         v3 ^= combined;
     354           0 :         HSIPROUND;
     355           0 :         v0 ^= combined;
     356           0 :         b |= third;
     357           0 :         HPOSTAMBLE
     358             : }
     359             : EXPORT_SYMBOL(hsiphash_3u32);
     360             : 
     361             : /**
     362             :  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
     363             :  * @first: first u32
     364             :  * @second: second u32
     365             :  * @third: third u32
     366             :  * @forth: forth u32
     367             :  * @key: the hsiphash key
     368             :  */
     369           0 : u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
     370             :                   const u32 forth, const hsiphash_key_t *key)
     371             : {
     372           0 :         u64 combined = (u64)second << 32 | first;
     373           0 :         HPREAMBLE(16)
     374           0 :         v3 ^= combined;
     375           0 :         HSIPROUND;
     376           0 :         v0 ^= combined;
     377           0 :         combined = (u64)forth << 32 | third;
     378           0 :         v3 ^= combined;
     379           0 :         HSIPROUND;
     380           0 :         v0 ^= combined;
     381           0 :         HPOSTAMBLE
     382             : }
     383             : EXPORT_SYMBOL(hsiphash_4u32);
     384             : #else
     385             : #define HSIPROUND HSIPHASH_PERMUTATION(v0, v1, v2, v3)
     386             : 
     387             : #define HPREAMBLE(len) \
     388             :         u32 v0 = HSIPHASH_CONST_0; \
     389             :         u32 v1 = HSIPHASH_CONST_1; \
     390             :         u32 v2 = HSIPHASH_CONST_2; \
     391             :         u32 v3 = HSIPHASH_CONST_3; \
     392             :         u32 b = ((u32)(len)) << 24; \
     393             :         v3 ^= key->key[1]; \
     394             :         v2 ^= key->key[0]; \
     395             :         v1 ^= key->key[1]; \
     396             :         v0 ^= key->key[0];
     397             : 
     398             : #define HPOSTAMBLE \
     399             :         v3 ^= b; \
     400             :         HSIPROUND; \
     401             :         v0 ^= b; \
     402             :         v2 ^= 0xff; \
     403             :         HSIPROUND; \
     404             :         HSIPROUND; \
     405             :         HSIPROUND; \
     406             :         return v1 ^ v3;
     407             : 
     408             : #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
     409             : u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key)
     410             : {
     411             :         const u8 *end = data + len - (len % sizeof(u32));
     412             :         const u8 left = len & (sizeof(u32) - 1);
     413             :         u32 m;
     414             :         HPREAMBLE(len)
     415             :         for (; data != end; data += sizeof(u32)) {
     416             :                 m = le32_to_cpup(data);
     417             :                 v3 ^= m;
     418             :                 HSIPROUND;
     419             :                 v0 ^= m;
     420             :         }
     421             :         switch (left) {
     422             :         case 3: b |= ((u32)end[2]) << 16; fallthrough;
     423             :         case 2: b |= le16_to_cpup(data); break;
     424             :         case 1: b |= end[0];
     425             :         }
     426             :         HPOSTAMBLE
     427             : }
     428             : EXPORT_SYMBOL(__hsiphash_aligned);
     429             : #endif
     430             : 
     431             : u32 __hsiphash_unaligned(const void *data, size_t len,
     432             :                          const hsiphash_key_t *key)
     433             : {
     434             :         const u8 *end = data + len - (len % sizeof(u32));
     435             :         const u8 left = len & (sizeof(u32) - 1);
     436             :         u32 m;
     437             :         HPREAMBLE(len)
     438             :         for (; data != end; data += sizeof(u32)) {
     439             :                 m = get_unaligned_le32(data);
     440             :                 v3 ^= m;
     441             :                 HSIPROUND;
     442             :                 v0 ^= m;
     443             :         }
     444             :         switch (left) {
     445             :         case 3: b |= ((u32)end[2]) << 16; fallthrough;
     446             :         case 2: b |= get_unaligned_le16(end); break;
     447             :         case 1: b |= end[0];
     448             :         }
     449             :         HPOSTAMBLE
     450             : }
     451             : EXPORT_SYMBOL(__hsiphash_unaligned);
     452             : 
     453             : /**
     454             :  * hsiphash_1u32 - compute 32-bit hsiphash PRF value of a u32
     455             :  * @first: first u32
     456             :  * @key: the hsiphash key
     457             :  */
     458             : u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
     459             : {
     460             :         HPREAMBLE(4)
     461             :         v3 ^= first;
     462             :         HSIPROUND;
     463             :         v0 ^= first;
     464             :         HPOSTAMBLE
     465             : }
     466             : EXPORT_SYMBOL(hsiphash_1u32);
     467             : 
     468             : /**
     469             :  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
     470             :  * @first: first u32
     471             :  * @second: second u32
     472             :  * @key: the hsiphash key
     473             :  */
     474             : u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
     475             : {
     476             :         HPREAMBLE(8)
     477             :         v3 ^= first;
     478             :         HSIPROUND;
     479             :         v0 ^= first;
     480             :         v3 ^= second;
     481             :         HSIPROUND;
     482             :         v0 ^= second;
     483             :         HPOSTAMBLE
     484             : }
     485             : EXPORT_SYMBOL(hsiphash_2u32);
     486             : 
     487             : /**
     488             :  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
     489             :  * @first: first u32
     490             :  * @second: second u32
     491             :  * @third: third u32
     492             :  * @key: the hsiphash key
     493             :  */
     494             : u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
     495             :                   const hsiphash_key_t *key)
     496             : {
     497             :         HPREAMBLE(12)
     498             :         v3 ^= first;
     499             :         HSIPROUND;
     500             :         v0 ^= first;
     501             :         v3 ^= second;
     502             :         HSIPROUND;
     503             :         v0 ^= second;
     504             :         v3 ^= third;
     505             :         HSIPROUND;
     506             :         v0 ^= third;
     507             :         HPOSTAMBLE
     508             : }
     509             : EXPORT_SYMBOL(hsiphash_3u32);
     510             : 
     511             : /**
     512             :  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
     513             :  * @first: first u32
     514             :  * @second: second u32
     515             :  * @third: third u32
     516             :  * @forth: forth u32
     517             :  * @key: the hsiphash key
     518             :  */
     519             : u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
     520             :                   const u32 forth, const hsiphash_key_t *key)
     521             : {
     522             :         HPREAMBLE(16)
     523             :         v3 ^= first;
     524             :         HSIPROUND;
     525             :         v0 ^= first;
     526             :         v3 ^= second;
     527             :         HSIPROUND;
     528             :         v0 ^= second;
     529             :         v3 ^= third;
     530             :         HSIPROUND;
     531             :         v0 ^= third;
     532             :         v3 ^= forth;
     533             :         HSIPROUND;
     534             :         v0 ^= forth;
     535             :         HPOSTAMBLE
     536             : }
     537             : EXPORT_SYMBOL(hsiphash_4u32);
     538             : #endif

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