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927e704e | 1 | /* |
9d987de3 | 2 | * Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved. |
927e704e AI |
3 | * Copyright 2014 Cryptography Research, Inc. |
4 | * | |
9d987de3 | 5 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
927e704e AI |
6 | * this file except in compliance with the License. You can obtain a copy |
7 | * in the file LICENSE in the source distribution or at | |
8 | * https://www.openssl.org/source/license.html | |
9 | * | |
10 | * Originally written by Mike Hamburg | |
11 | */ | |
70fd5110 | 12 | |
d5f9166b | 13 | #include "internal/e_os.h" |
6229815a | 14 | #include <openssl/macros.h> |
cd28d129 MC |
15 | #include "internal/numbers.h" |
16 | ||
17 | #ifndef UINT128_MAX | |
18 | /* No support for 128 bit ints, so do nothing here */ | |
19 | NON_EMPTY_TRANSLATION_UNIT | |
20 | #else | |
21 | ||
22 | # include "../field.h" | |
927e704e | 23 | |
70fd5110 | 24 | void gf_mul(gf_s * RESTRICT cs, const gf as, const gf bs) |
927e704e AI |
25 | { |
26 | const uint64_t *a = as->limb, *b = bs->limb; | |
27 | uint64_t *c = cs->limb; | |
70fd5110 AI |
28 | uint128_t accum0 = 0, accum1 = 0, accum2; |
29 | uint64_t mask = (1ULL << 56) - 1; | |
927e704e | 30 | uint64_t aa[4], bb[4], bbb[4]; |
eb7bcff6 | 31 | unsigned int i, j; |
927e704e AI |
32 | |
33 | for (i = 0; i < 4; i++) { | |
34 | aa[i] = a[i] + a[i + 4]; | |
35 | bb[i] = b[i] + b[i + 4]; | |
36 | bbb[i] = bb[i] + b[i + 4]; | |
37 | } | |
38 | ||
eb7bcff6 AI |
39 | for (i = 0; i < 4; i++) { |
40 | accum2 = 0; | |
927e704e | 41 | |
eb7bcff6 AI |
42 | for (j = 0; j <= i; j++) { |
43 | accum2 += widemul(a[j], b[i - j]); | |
44 | accum1 += widemul(aa[j], bb[i - j]); | |
45 | accum0 += widemul(a[j + 4], b[i - j + 4]); | |
46 | } | |
47 | for (; j < 4; j++) { | |
48 | accum2 += widemul(a[j], b[i - j + 8]); | |
49 | accum1 += widemul(aa[j], bbb[i - j + 4]); | |
50 | accum0 += widemul(a[j + 4], bb[i - j + 4]); | |
927e704e | 51 | } |
927e704e AI |
52 | |
53 | accum1 -= accum2; | |
54 | accum0 += accum2; | |
55 | ||
eb7bcff6 AI |
56 | c[i] = ((uint64_t)(accum0)) & mask; |
57 | c[i + 4] = ((uint64_t)(accum1)) & mask; | |
927e704e AI |
58 | |
59 | accum0 >>= 56; | |
60 | accum1 >>= 56; | |
eb7bcff6 | 61 | } |
927e704e AI |
62 | |
63 | accum0 += accum1; | |
64 | accum0 += c[4]; | |
65 | accum1 += c[0]; | |
66 | c[4] = ((uint64_t)(accum0)) & mask; | |
67 | c[0] = ((uint64_t)(accum1)) & mask; | |
68 | ||
69 | accum0 >>= 56; | |
70 | accum1 >>= 56; | |
71 | ||
72 | c[5] += ((uint64_t)(accum0)); | |
73 | c[1] += ((uint64_t)(accum1)); | |
74 | } | |
75 | ||
70fd5110 | 76 | void gf_mulw_unsigned(gf_s * RESTRICT cs, const gf as, uint32_t b) |
927e704e AI |
77 | { |
78 | const uint64_t *a = as->limb; | |
79 | uint64_t *c = cs->limb; | |
70fd5110 AI |
80 | uint128_t accum0 = 0, accum4 = 0; |
81 | uint64_t mask = (1ULL << 56) - 1; | |
927e704e AI |
82 | int i; |
83 | ||
84 | for (i = 0; i < 4; i++) { | |
85 | accum0 += widemul(b, a[i]); | |
86 | accum4 += widemul(b, a[i + 4]); | |
87 | c[i] = accum0 & mask; | |
88 | accum0 >>= 56; | |
89 | c[i + 4] = accum4 & mask; | |
90 | accum4 >>= 56; | |
91 | } | |
92 | ||
93 | accum0 += accum4 + c[4]; | |
94 | c[4] = accum0 & mask; | |
95 | c[5] += accum0 >> 56; | |
96 | ||
97 | accum4 += c[0]; | |
98 | c[0] = accum4 & mask; | |
99 | c[1] += accum4 >> 56; | |
100 | } | |
101 | ||
70fd5110 | 102 | void gf_sqr(gf_s * RESTRICT cs, const gf as) |
927e704e AI |
103 | { |
104 | const uint64_t *a = as->limb; | |
105 | uint64_t *c = cs->limb; | |
70fd5110 AI |
106 | uint128_t accum0 = 0, accum1 = 0, accum2; |
107 | uint64_t mask = (1ULL << 56) - 1; | |
927e704e | 108 | uint64_t aa[4]; |
70fd5110 | 109 | unsigned int i; |
927e704e AI |
110 | |
111 | /* For some reason clang doesn't vectorize this without prompting? */ | |
70fd5110 | 112 | for (i = 0; i < 4; i++) |
927e704e | 113 | aa[i] = a[i] + a[i + 4]; |
927e704e AI |
114 | |
115 | accum2 = widemul(a[0], a[3]); | |
116 | accum0 = widemul(aa[0], aa[3]); | |
117 | accum1 = widemul(a[4], a[7]); | |
118 | ||
119 | accum2 += widemul(a[1], a[2]); | |
120 | accum0 += widemul(aa[1], aa[2]); | |
121 | accum1 += widemul(a[5], a[6]); | |
122 | ||
123 | accum0 -= accum2; | |
124 | accum1 += accum2; | |
125 | ||
126 | c[3] = ((uint64_t)(accum1)) << 1 & mask; | |
127 | c[7] = ((uint64_t)(accum0)) << 1 & mask; | |
128 | ||
129 | accum0 >>= 55; | |
130 | accum1 >>= 55; | |
131 | ||
132 | accum0 += widemul(2 * aa[1], aa[3]); | |
133 | accum1 += widemul(2 * a[5], a[7]); | |
134 | accum0 += widemul(aa[2], aa[2]); | |
135 | accum1 += accum0; | |
136 | ||
137 | accum0 -= widemul(2 * a[1], a[3]); | |
138 | accum1 += widemul(a[6], a[6]); | |
139 | ||
140 | accum2 = widemul(a[0], a[0]); | |
141 | accum1 -= accum2; | |
142 | accum0 += accum2; | |
143 | ||
144 | accum0 -= widemul(a[2], a[2]); | |
145 | accum1 += widemul(aa[0], aa[0]); | |
146 | accum0 += widemul(a[4], a[4]); | |
147 | ||
148 | c[0] = ((uint64_t)(accum0)) & mask; | |
149 | c[4] = ((uint64_t)(accum1)) & mask; | |
150 | ||
151 | accum0 >>= 56; | |
152 | accum1 >>= 56; | |
153 | ||
154 | accum2 = widemul(2 * aa[2], aa[3]); | |
155 | accum0 -= widemul(2 * a[2], a[3]); | |
156 | accum1 += widemul(2 * a[6], a[7]); | |
157 | ||
158 | accum1 += accum2; | |
159 | accum0 += accum2; | |
160 | ||
161 | accum2 = widemul(2 * a[0], a[1]); | |
162 | accum1 += widemul(2 * aa[0], aa[1]); | |
163 | accum0 += widemul(2 * a[4], a[5]); | |
164 | ||
165 | accum1 -= accum2; | |
166 | accum0 += accum2; | |
167 | ||
168 | c[1] = ((uint64_t)(accum0)) & mask; | |
169 | c[5] = ((uint64_t)(accum1)) & mask; | |
170 | ||
171 | accum0 >>= 56; | |
172 | accum1 >>= 56; | |
173 | ||
174 | accum2 = widemul(aa[3], aa[3]); | |
175 | accum0 -= widemul(a[3], a[3]); | |
176 | accum1 += widemul(a[7], a[7]); | |
177 | ||
178 | accum1 += accum2; | |
179 | accum0 += accum2; | |
180 | ||
181 | accum2 = widemul(2 * a[0], a[2]); | |
182 | accum1 += widemul(2 * aa[0], aa[2]); | |
183 | accum0 += widemul(2 * a[4], a[6]); | |
184 | ||
185 | accum2 += widemul(a[1], a[1]); | |
186 | accum1 += widemul(aa[1], aa[1]); | |
187 | accum0 += widemul(a[5], a[5]); | |
188 | ||
189 | accum1 -= accum2; | |
190 | accum0 += accum2; | |
191 | ||
192 | c[2] = ((uint64_t)(accum0)) & mask; | |
193 | c[6] = ((uint64_t)(accum1)) & mask; | |
194 | ||
195 | accum0 >>= 56; | |
196 | accum1 >>= 56; | |
197 | ||
198 | accum0 += c[3]; | |
199 | accum1 += c[7]; | |
200 | c[3] = ((uint64_t)(accum0)) & mask; | |
201 | c[7] = ((uint64_t)(accum1)) & mask; | |
202 | ||
203 | /* we could almost stop here, but it wouldn't be stable, so... */ | |
204 | ||
205 | accum0 >>= 56; | |
206 | accum1 >>= 56; | |
207 | c[4] += ((uint64_t)(accum0)) + ((uint64_t)(accum1)); | |
208 | c[0] += ((uint64_t)(accum1)); | |
209 | } | |
cd28d129 | 210 | #endif |