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Commit | Line | Data |
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9bf3b535 LP |
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 | void siphash24(uint8_t out[8], const void *_in, size_t inlen, const uint8_t k[16]) | |
57 | { | |
58 | /* "somepseudorandomlygeneratedbytes" */ | |
59 | u64 v0 = 0x736f6d6570736575ULL; | |
60 | u64 v1 = 0x646f72616e646f6dULL; | |
61 | u64 v2 = 0x6c7967656e657261ULL; | |
62 | u64 v3 = 0x7465646279746573ULL; | |
63 | u64 b; | |
64 | u64 k0 = U8TO64_LE( k ); | |
65 | u64 k1 = U8TO64_LE( k + 8 ); | |
66 | u64 m; | |
67 | const u8 *in = _in; | |
68 | const u8 *end = in + inlen - ( inlen % sizeof( u64 ) ); | |
69 | const int left = inlen & 7; | |
70 | b = ( ( u64 )inlen ) << 56; | |
71 | v3 ^= k1; | |
72 | v2 ^= k0; | |
73 | v1 ^= k1; | |
74 | v0 ^= k0; | |
75 | ||
76 | for ( ; in != end; in += 8 ) | |
77 | { | |
78 | 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 | v3 ^= m; | |
87 | SIPROUND; | |
88 | SIPROUND; | |
89 | v0 ^= m; | |
90 | } | |
91 | ||
92 | switch( left ) | |
93 | { | |
94 | case 7: b |= ( ( u64 )in[ 6] ) << 48; | |
95 | ||
96 | case 6: b |= ( ( u64 )in[ 5] ) << 40; | |
97 | ||
98 | case 5: b |= ( ( u64 )in[ 4] ) << 32; | |
99 | ||
100 | case 4: b |= ( ( u64 )in[ 3] ) << 24; | |
101 | ||
102 | case 3: b |= ( ( u64 )in[ 2] ) << 16; | |
103 | ||
104 | case 2: b |= ( ( u64 )in[ 1] ) << 8; | |
105 | ||
106 | case 1: b |= ( ( u64 )in[ 0] ); break; | |
107 | ||
108 | 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 | v3 ^= b; | |
119 | SIPROUND; | |
120 | SIPROUND; | |
121 | 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 | v2 ^= 0xff; | |
129 | SIPROUND; | |
130 | SIPROUND; | |
131 | SIPROUND; | |
132 | SIPROUND; | |
133 | b = v0 ^ v1 ^ v2 ^ v3; | |
134 | U64TO8_LE( out, b ); | |
135 | } |