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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 | * | |
a7f182b7 | 5 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
1308e022 MC |
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 | 12 | |
ae4186b0 DMSP |
13 | #ifndef OSSL_CRYPTO_EC_CURVE448_ARCH_32_F_IMPL_H |
14 | # define OSSL_CRYPTO_EC_CURVE448_ARCH_32_F_IMPL_H | |
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15 | |
16 | # define GF_HEADROOM 2 | |
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17 | # define LIMB(x) ((x) & ((1 << 28) - 1)), ((x) >> 28) |
18 | # define FIELD_LITERAL(a, b, c, d, e, f, g, h) \ | |
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 | |
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23 | void gf_add_RAW(gf out, const gf a, const gf b) |
24 | { | |
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25 | unsigned int i; |
26 | ||
53ef3252 | 27 | for (i = 0; i < NLIMBS; i++) |
7324473f | 28 | out->limb[i] = a->limb[i] + b->limb[i]; |
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29 | } |
30 | ||
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31 | void gf_sub_RAW(gf out, const gf a, const gf b) |
32 | { | |
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33 | unsigned int i; |
34 | ||
53ef3252 | 35 | for (i = 0; i < NLIMBS; i++) |
7324473f | 36 | out->limb[i] = a->limb[i] - b->limb[i]; |
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37 | } |
38 | ||
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39 | void gf_bias(gf a, int amt) |
40 | { | |
094c071c | 41 | unsigned int i; |
205fd638 | 42 | uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt; |
094c071c | 43 | |
756b5af7 | 44 | for (i = 0; i < NLIMBS; i++) |
8e32ec7a | 45 | a->limb[i] += (i == NLIMBS / 2) ? co2 : co1; |
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46 | } |
47 | ||
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48 | void gf_weak_reduce(gf a) |
49 | { | |
50 | uint32_t mask = (1 << 28) - 1; | |
8e32ec7a | 51 | uint32_t tmp = a->limb[NLIMBS - 1] >> 28; |
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52 | unsigned int i; |
53 | ||
8e32ec7a | 54 | a->limb[NLIMBS / 2] += tmp; |
18985129 | 55 | for (i = NLIMBS - 1; i > 0; i--) |
205fd638 | 56 | a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28); |
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57 | a->limb[0] = (a->limb[0] & mask) + tmp; |
58 | } | |
68b20c00 | 59 | |
ae4186b0 | 60 | #endif /* OSSL_CRYPTO_EC_CURVE448_ARCH_32_F_IMPL_H */ |