1 /*
2 SipHash reference C implementation
3
4 Copyright (c) 2012-2016 Jean-Philippe Aumasson
5 <jeanphilippe.aumasson@gmail.com>
6 Copyright (c) 2012-2014 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
13 with
14 this software. If not, see
15 <http://creativecommons.org/publicdomain/zero/1.0/>.
16 */
17 /**
18 * Edited slightly for integration in Unbound. Edits are noted with 'EDIT'.
19 */
20 /** EDIT
21 * \#include <assert.h>
22 * \#include <stdint.h>
23 * \#include <stdio.h>
24 * \#include <string.h>
25 * Replaced the above includes with Unbound's config.h
26 */
27 #include "config.h"
28
29 /** EDIT
30 * prevent warning from -Wmissing-prototypes
31 */
32 #include "util/siphash.h"
33
34 /* default: SipHash-2-4 */
35 #define cROUNDS 2
36 #define dROUNDS 4
37
38 #define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
39
40 #define U32TO8_LE(p, v) \
41 (p)[0] = (uint8_t)((v)); \
42 (p)[1] = (uint8_t)((v) >> 8); \
43 (p)[2] = (uint8_t)((v) >> 16); \
44 (p)[3] = (uint8_t)((v) >> 24);
45
46 #define U64TO8_LE(p, v) \
47 U32TO8_LE((p), (uint32_t)((v))); \
48 U32TO8_LE((p) + 4, (uint32_t)((v) >> 32));
49
50 #define U8TO64_LE(p) \
51 (((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \
52 ((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \
53 ((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \
54 ((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56))
55
56 #define SIPROUND \
57 do { \
58 v0 += v1; \
59 v1 = ROTL(v1, 13); \
60 v1 ^= v0; \
61 v0 = ROTL(v0, 32); \
62 v2 += v3; \
63 v3 = ROTL(v3, 16); \
64 v3 ^= v2; \
65 v0 += v3; \
66 v3 = ROTL(v3, 21); \
67 v3 ^= v0; \
68 v2 += v1; \
69 v1 = ROTL(v1, 17); \
70 v1 ^= v2; \
71 v2 = ROTL(v2, 32); \
72 } while (0)
73
74 #ifdef DEBUG
75 #define TRACE \
76 do { \
77 printf("(%3d) v0 %08x %08x\n", (int)inlen, (uint32_t)(v0 >> 32), \
78 (uint32_t)v0); \
79 printf("(%3d) v1 %08x %08x\n", (int)inlen, (uint32_t)(v1 >> 32), \
80 (uint32_t)v1); \
81 printf("(%3d) v2 %08x %08x\n", (int)inlen, (uint32_t)(v2 >> 32), \
82 (uint32_t)v2); \
83 printf("(%3d) v3 %08x %08x\n", (int)inlen, (uint32_t)(v3 >> 32), \
84 (uint32_t)v3); \
85 } while (0)
86 #else
87 #define TRACE
88 #endif
89
siphash(const uint8_t * in,const size_t inlen,const uint8_t * k,uint8_t * out,const size_t outlen)90 int siphash(const uint8_t *in, const size_t inlen, const uint8_t *k,
91 uint8_t *out, const size_t outlen) {
92
93 uint64_t v0 = 0x736f6d6570736575ULL;
94 uint64_t v1 = 0x646f72616e646f6dULL;
95 uint64_t v2 = 0x6c7967656e657261ULL;
96 uint64_t v3 = 0x7465646279746573ULL;
97 uint64_t k0 = U8TO64_LE(k);
98 uint64_t k1 = U8TO64_LE(k + 8);
99 uint64_t m;
100 int i;
101 const uint8_t *end = in + inlen - (inlen % sizeof(uint64_t));
102 const int left = inlen & 7;
103 uint64_t b = ((uint64_t)inlen) << 56;
104 /** EDIT
105 * The following assert moved here from the top for C90 compliance.
106 */
107 assert((outlen == 8) || (outlen == 16));
108 v3 ^= k1;
109 v2 ^= k0;
110 v1 ^= k1;
111 v0 ^= k0;
112
113 if (outlen == 16)
114 v1 ^= 0xee;
115
116 for (; in != end; in += 8) {
117 m = U8TO64_LE(in);
118 v3 ^= m;
119
120 TRACE;
121 for (i = 0; i < cROUNDS; ++i)
122 SIPROUND;
123
124 v0 ^= m;
125 }
126
127 switch (left) {
128 case 7:
129 b |= ((uint64_t)in[6]) << 48;
130 /** EDIT annotate case statement fallthrough for gcc */
131 /* fallthrough */
132 case 6:
133 b |= ((uint64_t)in[5]) << 40;
134 /** EDIT annotate case statement fallthrough for gcc */
135 /* fallthrough */
136 case 5:
137 b |= ((uint64_t)in[4]) << 32;
138 /** EDIT annotate case statement fallthrough for gcc */
139 /* fallthrough */
140 case 4:
141 b |= ((uint64_t)in[3]) << 24;
142 /** EDIT annotate case statement fallthrough for gcc */
143 /* fallthrough */
144 case 3:
145 b |= ((uint64_t)in[2]) << 16;
146 /** EDIT annotate case statement fallthrough for gcc */
147 /* fallthrough */
148 case 2:
149 b |= ((uint64_t)in[1]) << 8;
150 /** EDIT annotate case statement fallthrough for gcc */
151 /* fallthrough */
152 case 1:
153 b |= ((uint64_t)in[0]);
154 break;
155 case 0:
156 break;
157 }
158
159 v3 ^= b;
160
161 TRACE;
162 for (i = 0; i < cROUNDS; ++i)
163 SIPROUND;
164
165 v0 ^= b;
166
167 if (outlen == 16)
168 v2 ^= 0xee;
169 else
170 v2 ^= 0xff;
171
172 TRACE;
173 for (i = 0; i < dROUNDS; ++i)
174 SIPROUND;
175
176 b = v0 ^ v1 ^ v2 ^ v3;
177 U64TO8_LE(out, b);
178
179 if (outlen == 8)
180 return 0;
181
182 v1 ^= 0xdd;
183
184 TRACE;
185 for (i = 0; i < dROUNDS; ++i)
186 SIPROUND;
187
188 b = v0 ^ v1 ^ v2 ^ v3;
189 U64TO8_LE(out + 8, b);
190
191 return 0;
192 }
193