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1308e022 | 1 | /* |
f53c7764 | 2 | * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. |
1308e022 MC |
3 | * Copyright 2014-2016 Cryptography Research, Inc. |
4 | * | |
5 | * Licensed under the OpenSSL license (the "License"). You may not use | |
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 | |
7324473f | 11 | */ |
68b20c00 MC |
12 | |
13 | #ifndef HEADER_ARCH_32_F_IMPL_H | |
14 | # define HEADER_ARCH_32_F_IMPL_H | |
15 | ||
16 | # define GF_HEADROOM 2 | |
17 | # define LIMB(x) (x)&((1<<28)-1), (x)>>28 | |
18 | # define FIELD_LITERAL(a,b,c,d,e,f,g,h) \ | |
7324473f | 19 | {{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}} |
205fd638 | 20 | |
68b20c00 | 21 | # define LIMB_PLACE_VALUE(i) 28 |
7324473f | 22 | |
205fd638 MC |
23 | void gf_add_RAW(gf out, const gf a, const gf b) |
24 | { | |
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25 | unsigned int i; |
26 | ||
7114a5a1 | 27 | for (i = 0; i < NLIMBS; i++) { |
7324473f MC |
28 | out->limb[i] = a->limb[i] + b->limb[i]; |
29 | } | |
30 | } | |
31 | ||
205fd638 MC |
32 | void gf_sub_RAW(gf out, const gf a, const gf b) |
33 | { | |
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34 | unsigned int i; |
35 | ||
756b5af7 | 36 | for (i = 0; i < NLIMBS; i++) { |
7324473f MC |
37 | out->limb[i] = a->limb[i] - b->limb[i]; |
38 | } | |
39 | } | |
40 | ||
205fd638 MC |
41 | void gf_bias(gf a, int amt) |
42 | { | |
094c071c | 43 | unsigned int i; |
205fd638 | 44 | uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt; |
094c071c | 45 | |
756b5af7 | 46 | for (i = 0; i < NLIMBS; i++) |
205fd638 | 47 | a->limb[i] += (i == sizeof(*a) / sizeof(a->limb[0]) / 2) ? co2 : co1; |
7324473f MC |
48 | } |
49 | ||
205fd638 MC |
50 | void gf_weak_reduce(gf a) |
51 | { | |
52 | uint32_t mask = (1 << 28) - 1; | |
7324473f | 53 | uint32_t tmp = a->limb[15] >> 28; |
094c071c MC |
54 | unsigned int i; |
55 | ||
7324473f | 56 | a->limb[8] += tmp; |
8d55f844 | 57 | for (i = 15; i > 0; i--) |
205fd638 | 58 | a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28); |
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59 | a->limb[0] = (a->limb[0] & mask) + tmp; |
60 | } | |
68b20c00 MC |
61 | |
62 | #endif /* HEADER_ARCH_32_F_IMPL_H */ |