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448e7440 ZJS |
1 | /* SPDX-License-Identifier: CC0-1.0 */ |
2 | ||
9bf3b535 LP |
3 | /* |
4 | SipHash reference C implementation | |
5 | ||
6 | Written in 2012 by | |
7 | Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com> | |
8 | Daniel J. Bernstein <djb@cr.yp.to> | |
9 | ||
10 | To the extent possible under law, the author(s) have dedicated all copyright | |
11 | and related and neighboring rights to this software to the public domain | |
12 | worldwide. This software is distributed without any warranty. | |
13 | ||
14 | You should have received a copy of the CC0 Public Domain Dedication along with | |
448e7440 | 15 | this software. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>. |
9bf3b535 LP |
16 | |
17 | (Minimal changes made by Lennart Poettering, to make clean for inclusion in systemd) | |
17010c23 TG |
18 | (Refactored by Tom Gundersen to split up in several functions and follow systemd |
19 | coding style) | |
9bf3b535 | 20 | */ |
17010c23 | 21 | |
ac9b215d TJ |
22 | #include <stdio.h> |
23 | ||
11c3a366 | 24 | #include "macro.h" |
93cc7779 | 25 | #include "siphash24.h" |
8dd85afe | 26 | #include "unaligned.h" |
17010c23 | 27 | |
a1e92eee | 28 | static uint64_t rotate_left(uint64_t x, uint8_t b) { |
17010c23 TG |
29 | assert(b < 64); |
30 | ||
31 | return (x << b) | (x >> (64 - b)); | |
32 | } | |
9bf3b535 | 33 | |
a1e92eee | 34 | static void sipround(struct siphash *state) { |
17010c23 TG |
35 | assert(state); |
36 | ||
37 | state->v0 += state->v1; | |
38 | state->v1 = rotate_left(state->v1, 13); | |
39 | state->v1 ^= state->v0; | |
40 | state->v0 = rotate_left(state->v0, 32); | |
41 | state->v2 += state->v3; | |
42 | state->v3 = rotate_left(state->v3, 16); | |
43 | state->v3 ^= state->v2; | |
44 | state->v0 += state->v3; | |
45 | state->v3 = rotate_left(state->v3, 21); | |
46 | state->v3 ^= state->v0; | |
47 | state->v2 += state->v1; | |
48 | state->v1 = rotate_left(state->v1, 17); | |
49 | state->v1 ^= state->v2; | |
50 | state->v2 = rotate_left(state->v2, 32); | |
51 | } | |
9bf3b535 | 52 | |
3042bbeb | 53 | void siphash24_init(struct siphash *state, const uint8_t k[static 16]) { |
17010c23 TG |
54 | uint64_t k0, k1; |
55 | ||
56 | assert(state); | |
57 | assert(k); | |
58 | ||
4de91d7e LP |
59 | k0 = unaligned_read_le64(k); |
60 | k1 = unaligned_read_le64(k + 8); | |
17010c23 | 61 | |
6059dab8 LP |
62 | *state = (struct siphash) { |
63 | /* "somepseudorandomlygeneratedbytes" */ | |
64 | .v0 = 0x736f6d6570736575ULL ^ k0, | |
65 | .v1 = 0x646f72616e646f6dULL ^ k1, | |
66 | .v2 = 0x6c7967656e657261ULL ^ k0, | |
67 | .v3 = 0x7465646279746573ULL ^ k1, | |
68 | .padding = 0, | |
69 | .inlen = 0, | |
70 | }; | |
708684ef TG |
71 | } |
72 | ||
7c57f504 | 73 | void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) { |
6059dab8 | 74 | |
17010c23 TG |
75 | const uint8_t *in = _in; |
76 | const uint8_t *end = in + inlen; | |
6059dab8 LP |
77 | size_t left = state->inlen & 7; |
78 | uint64_t m; | |
17010c23 TG |
79 | |
80 | assert(in); | |
81 | assert(state); | |
708684ef | 82 | |
6059dab8 | 83 | /* Update total length */ |
17010c23 | 84 | state->inlen += inlen; |
9bf3b535 | 85 | |
6059dab8 | 86 | /* If padding exists, fill it out */ |
17010c23 | 87 | if (left > 0) { |
6059dab8 LP |
88 | for ( ; in < end && left < 8; in ++, left ++) |
89 | state->padding |= ((uint64_t) *in) << (left * 8); | |
2c4cc3bd | 90 | |
17010c23 | 91 | if (in == end && left < 8) |
6059dab8 | 92 | /* We did not have enough input to fill out the padding completely */ |
17010c23 | 93 | return; |
2c4cc3bd | 94 | |
d6601495 | 95 | #if ENABLE_DEBUG_SIPHASH |
17010c23 TG |
96 | printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); |
97 | printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1); | |
98 | printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2); | |
99 | printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); | |
100 | printf("(%3zu) compress padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t)state->padding); | |
2c4cc3bd | 101 | #endif |
6059dab8 | 102 | |
17010c23 TG |
103 | state->v3 ^= state->padding; |
104 | sipround(state); | |
105 | sipround(state); | |
106 | state->v0 ^= state->padding; | |
2c4cc3bd | 107 | |
17010c23 TG |
108 | state->padding = 0; |
109 | } | |
2c4cc3bd | 110 | |
6059dab8 | 111 | end -= (state->inlen % sizeof(uint64_t)); |
2c4cc3bd | 112 | |
6059dab8 | 113 | for ( ; in < end; in += 8) { |
8dd85afe | 114 | m = unaligned_read_le64(in); |
d6601495 | 115 | #if ENABLE_DEBUG_SIPHASH |
17010c23 TG |
116 | printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); |
117 | printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1); | |
118 | printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2); | |
119 | printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); | |
120 | printf("(%3zu) compress %08x %08x\n", state->inlen, (uint32_t) (m >> 32), (uint32_t) m); | |
9bf3b535 | 121 | #endif |
17010c23 TG |
122 | state->v3 ^= m; |
123 | sipround(state); | |
124 | sipround(state); | |
125 | state->v0 ^= m; | |
126 | } | |
9bf3b535 | 127 | |
17010c23 | 128 | left = state->inlen & 7; |
6059dab8 LP |
129 | switch (left) { |
130 | case 7: | |
131 | state->padding |= ((uint64_t) in[6]) << 48; | |
4831981d | 132 | _fallthrough_; |
6059dab8 LP |
133 | case 6: |
134 | state->padding |= ((uint64_t) in[5]) << 40; | |
4831981d | 135 | _fallthrough_; |
6059dab8 LP |
136 | case 5: |
137 | state->padding |= ((uint64_t) in[4]) << 32; | |
4831981d | 138 | _fallthrough_; |
6059dab8 LP |
139 | case 4: |
140 | state->padding |= ((uint64_t) in[3]) << 24; | |
4831981d | 141 | _fallthrough_; |
6059dab8 LP |
142 | case 3: |
143 | state->padding |= ((uint64_t) in[2]) << 16; | |
4831981d | 144 | _fallthrough_; |
6059dab8 LP |
145 | case 2: |
146 | state->padding |= ((uint64_t) in[1]) << 8; | |
4831981d | 147 | _fallthrough_; |
6059dab8 LP |
148 | case 1: |
149 | state->padding |= ((uint64_t) in[0]); | |
4831981d | 150 | _fallthrough_; |
6059dab8 LP |
151 | case 0: |
152 | break; | |
17010c23 | 153 | } |
f2936011 TG |
154 | } |
155 | ||
933f9cae | 156 | uint64_t siphash24_finalize(struct siphash *state) { |
17010c23 | 157 | uint64_t b; |
9bf3b535 | 158 | |
6059dab8 LP |
159 | assert(state); |
160 | ||
161 | b = state->padding | (((uint64_t) state->inlen) << 56); | |
162 | ||
d6601495 | 163 | #if ENABLE_DEBUG_SIPHASH |
6059dab8 LP |
164 | printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); |
165 | printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1); | |
166 | printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2); | |
167 | printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); | |
17010c23 | 168 | printf("(%3zu) padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t) state->padding); |
9bf3b535 | 169 | #endif |
6059dab8 | 170 | |
17010c23 TG |
171 | state->v3 ^= b; |
172 | sipround(state); | |
173 | sipround(state); | |
174 | state->v0 ^= b; | |
f2936011 | 175 | |
d6601495 | 176 | #if ENABLE_DEBUG_SIPHASH |
17010c23 TG |
177 | printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); |
178 | printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1); | |
179 | printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2); | |
180 | printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); | |
9bf3b535 | 181 | #endif |
17010c23 | 182 | state->v2 ^= 0xff; |
c7b68d84 | 183 | |
17010c23 TG |
184 | sipround(state); |
185 | sipround(state); | |
186 | sipround(state); | |
187 | sipround(state); | |
0cb3c286 | 188 | |
933f9cae | 189 | return state->v0 ^ state->v1 ^ state->v2 ^ state->v3; |
c7b68d84 TG |
190 | } |
191 | ||
3042bbeb | 192 | uint64_t siphash24(const void *in, size_t inlen, const uint8_t k[static 16]) { |
17010c23 | 193 | struct siphash state; |
9e77e048 | 194 | |
6059dab8 LP |
195 | assert(in); |
196 | assert(k); | |
197 | ||
17010c23 | 198 | siphash24_init(&state, k); |
6059dab8 | 199 | siphash24_compress(in, inlen, &state); |
933f9cae DM |
200 | |
201 | return siphash24_finalize(&state); | |
9bf3b535 | 202 | } |