Line data Source code
1 : /*
2 : SipHash reference C implementation
3 :
4 : Written in 2012 by
5 : Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
6 : Daniel J. Bernstein <djb@cr.yp.to>
7 :
8 : To the extent possible under law, the author(s) have dedicated all copyright
9 : and related and neighboring rights to this software to the public domain
10 : worldwide. This software is distributed without any warranty.
11 :
12 : You should have received a copy of the CC0 Public Domain Dedication along with
13 : this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
14 :
15 : (Minimal changes made by Lennart Poettering, to make clean for inclusion in systemd)
16 : */
17 : #include <stdint.h>
18 : #include <stdio.h>
19 : #include <string.h>
20 :
21 : #include "siphash24.h"
22 :
23 : typedef uint64_t u64;
24 : typedef uint32_t u32;
25 : typedef uint8_t u8;
26 :
27 : #define ROTL(x,b) (u64)( ((x) << (b)) | ( (x) >> (64 - (b))) )
28 :
29 : #define U32TO8_LE(p, v) \
30 : (p)[0] = (u8)((v) ); (p)[1] = (u8)((v) >> 8); \
31 : (p)[2] = (u8)((v) >> 16); (p)[3] = (u8)((v) >> 24);
32 :
33 : #define U64TO8_LE(p, v) \
34 : U32TO8_LE((p), (u32)((v) )); \
35 : U32TO8_LE((p) + 4, (u32)((v) >> 32));
36 :
37 : #define U8TO64_LE(p) \
38 : (((u64)((p)[0]) ) | \
39 : ((u64)((p)[1]) << 8) | \
40 : ((u64)((p)[2]) << 16) | \
41 : ((u64)((p)[3]) << 24) | \
42 : ((u64)((p)[4]) << 32) | \
43 : ((u64)((p)[5]) << 40) | \
44 : ((u64)((p)[6]) << 48) | \
45 : ((u64)((p)[7]) << 56))
46 :
47 : #define SIPROUND \
48 : do { \
49 : v0 += v1; v1=ROTL(v1,13); v1 ^= v0; v0=ROTL(v0,32); \
50 : v2 += v3; v3=ROTL(v3,16); v3 ^= v2; \
51 : v0 += v3; v3=ROTL(v3,21); v3 ^= v0; \
52 : v2 += v1; v1=ROTL(v1,17); v1 ^= v2; v2=ROTL(v2,32); \
53 : } while(0)
54 :
55 : /* SipHash-2-4 */
56 33860433 : void siphash24(uint8_t out[8], const void *_in, size_t inlen, const uint8_t k[16])
57 : {
58 : /* "somepseudorandomlygeneratedbytes" */
59 33860433 : u64 v0 = 0x736f6d6570736575ULL;
60 33860433 : u64 v1 = 0x646f72616e646f6dULL;
61 33860433 : u64 v2 = 0x6c7967656e657261ULL;
62 33860433 : u64 v3 = 0x7465646279746573ULL;
63 : u64 b;
64 33860433 : u64 k0 = U8TO64_LE( k );
65 33860433 : u64 k1 = U8TO64_LE( k + 8 );
66 : u64 m;
67 33860433 : const u8 *in = _in;
68 33860433 : const u8 *end = in + inlen - ( inlen % sizeof( u64 ) );
69 33860433 : const int left = inlen & 7;
70 33860433 : b = ( ( u64 )inlen ) << 56;
71 33860433 : v3 ^= k1;
72 33860433 : v2 ^= k0;
73 33860433 : v1 ^= k1;
74 33860433 : v0 ^= k0;
75 :
76 67842958 : for ( ; in != end; in += 8 )
77 : {
78 33982525 : m = U8TO64_LE( in );
79 : #ifdef DEBUG
80 : printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
81 : printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
82 : printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
83 : printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
84 : printf( "(%3d) compress %08x %08x\n", ( int )inlen, ( u32 )( m >> 32 ), ( u32 )m );
85 : #endif
86 33982525 : v3 ^= m;
87 33982525 : SIPROUND;
88 33982525 : SIPROUND;
89 33982525 : v0 ^= m;
90 : }
91 :
92 33860433 : switch( left )
93 : {
94 6999 : case 7: b |= ( ( u64 )in[ 6] ) << 48;
95 :
96 12992 : case 6: b |= ( ( u64 )in[ 5] ) << 40;
97 :
98 17709 : case 5: b |= ( ( u64 )in[ 4] ) << 32;
99 :
100 25658 : case 4: b |= ( ( u64 )in[ 3] ) << 24;
101 :
102 32147 : case 3: b |= ( ( u64 )in[ 2] ) << 16;
103 :
104 38004 : case 2: b |= ( ( u64 )in[ 1] ) << 8;
105 :
106 42421 : case 1: b |= ( ( u64 )in[ 0] ); break;
107 :
108 33818012 : case 0: break;
109 : }
110 :
111 : #ifdef DEBUG
112 : printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
113 : printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
114 : printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
115 : printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
116 : printf( "(%3d) padding %08x %08x\n", ( int )inlen, ( u32 )( b >> 32 ), ( u32 )b );
117 : #endif
118 33860433 : v3 ^= b;
119 33860433 : SIPROUND;
120 33860433 : SIPROUND;
121 33860433 : v0 ^= b;
122 : #ifdef DEBUG
123 : printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
124 : printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
125 : printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
126 : printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
127 : #endif
128 33860433 : v2 ^= 0xff;
129 33860433 : SIPROUND;
130 33860433 : SIPROUND;
131 33860433 : SIPROUND;
132 33860433 : SIPROUND;
133 33860433 : b = v0 ^ v1 ^ v2 ^ v3;
134 33860433 : U64TO8_LE( out, b );
135 33860433 : }
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