1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#ifndef SIPHASHH
#define SIPHASHH
/*
SipHash reference C implementation
Copyright (c) 2012-2021 Jean-Philippe Aumasson
<jeanphilippe.aumasson@gmail.com>
Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to>
To the extent possible under law, the author(s) have dedicated all copyright
and related and neighboring rights to this software to the public domain
worldwide. This software is distributed without any warranty.
You should have received a copy of the CC0 Public Domain Dedication along
with
this software. If not, see
<http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
#include <string.h>
namespace spacefillr {
/* default: SipHash-2-4 */
/* tyler: changed to 1-3 */
#ifndef cROUNDS
#define cROUNDS 1
#endif
#ifndef dROUNDS
#define dROUNDS 3
#endif
#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
#define U32TO8_LE(p, v) \
(p)[0] = (uint8_t)((v)); \
(p)[1] = (uint8_t)((v) >> 8); \
(p)[2] = (uint8_t)((v) >> 16); \
(p)[3] = (uint8_t)((v) >> 24);
#define U64TO8_LE(p, v) \
U32TO8_LE((p), (uint32_t)((v))); \
U32TO8_LE((p) + 4, (uint32_t)((v) >> 32));
#define U8TO64_LE(p) \
(((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \
((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \
((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \
((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56))
#define SIPROUND \
do { \
v0 += v1; \
v1 = ROTL(v1, 13); \
v1 ^= v0; \
v0 = ROTL(v0, 32); \
v2 += v3; \
v3 = ROTL(v3, 16); \
v3 ^= v2; \
v0 += v3; \
v3 = ROTL(v3, 21); \
v3 ^= v0; \
v2 += v1; \
v1 = ROTL(v1, 17); \
v1 ^= v2; \
v2 = ROTL(v2, 32); \
} while (0)
#ifdef DEBUG
#define TRACE \
do { \
printf("(%3zu) v0 %016"PRIx64"\n", inlen, v0); \
printf("(%3zu) v1 %016"PRIx64"\n", inlen, v1); \
printf("(%3zu) v2 %016"PRIx64"\n", inlen, v2); \
printf("(%3zu) v3 %016"PRIx64"\n", inlen, v3); \
} while (0)
#else
#define TRACE
#endif
static inline int siphash(const uint8_t *in, const size_t inlen, const uint8_t *k,
uint8_t *out, const size_t outlen) {
assert((outlen == 8) || (outlen == 16));
uint64_t v0 = UINT64_C(0x736f6d6570736575);
uint64_t v1 = UINT64_C(0x646f72616e646f6d);
uint64_t v2 = UINT64_C(0x6c7967656e657261);
uint64_t v3 = UINT64_C(0x7465646279746573);
uint64_t k0 = U8TO64_LE(k);
uint64_t k1 = U8TO64_LE(k + 8);
uint64_t m;
int i;
const uint8_t *end = in + inlen - (inlen % sizeof(uint64_t));
const int left = inlen & 7;
uint64_t b = ((uint64_t)inlen) << 56;
v3 ^= k1;
v2 ^= k0;
v1 ^= k1;
v0 ^= k0;
if (outlen == 16)
v1 ^= 0xee;
for (; in != end; in += 8) {
m = U8TO64_LE(in);
v3 ^= m;
TRACE;
for (i = 0; i < cROUNDS; ++i)
SIPROUND;
v0 ^= m;
}
switch (left) {
case 7:
b |= ((uint64_t)in[6]) << 48;
case 6:
b |= ((uint64_t)in[5]) << 40;
case 5:
b |= ((uint64_t)in[4]) << 32;
case 4:
b |= ((uint64_t)in[3]) << 24;
case 3:
b |= ((uint64_t)in[2]) << 16;
case 2:
b |= ((uint64_t)in[1]) << 8;
case 1:
b |= ((uint64_t)in[0]);
break;
case 0:
break;
}
v3 ^= b;
TRACE;
for (i = 0; i < cROUNDS; ++i)
SIPROUND;
v0 ^= b;
if (outlen == 16)
v2 ^= 0xee;
else
v2 ^= 0xff;
TRACE;
for (i = 0; i < dROUNDS; ++i)
SIPROUND;
b = v0 ^ v1 ^ v2 ^ v3;
U64TO8_LE(out, b);
if (outlen == 8)
return 0;
v1 ^= 0xdd;
TRACE;
for (i = 0; i < dROUNDS; ++i)
SIPROUND;
b = v0 ^ v1 ^ v2 ^ v3;
U64TO8_LE(out + 8, b);
return 0;
}
} //namespace spacefillr
#endif
|
