2 * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2014-2016 Cryptography Research, Inc.
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
10 * Originally written by Mike Hamburg
14 #define LIMB(x) (x##ull)&((1ull<<28)-1), (x##ull)>>28
15 #define FIELD_LITERAL(a,b,c,d,e,f,g,h) \
16 {{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}}
18 #define LIMB_PLACE_VALUE(i) 28
20 void gf_add_RAW(gf out, const gf a, const gf b)
22 for (unsigned int i = 0; i < sizeof(*out) / sizeof(uint32xn_t); i++) {
23 ((uint32xn_t *) out)[i] =
24 ((const uint32xn_t *)a)[i] + ((const uint32xn_t *)b)[i];
27 * for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
28 * out->limb[i] = a->limb[i] + b->limb[i]; }
32 void gf_sub_RAW(gf out, const gf a, const gf b)
34 for (unsigned int i = 0; i < sizeof(*out) / sizeof(uint32xn_t); i++) {
35 ((uint32xn_t *) out)[i] =
36 ((const uint32xn_t *)a)[i] - ((const uint32xn_t *)b)[i];
39 * for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
40 * out->limb[i] = a->limb[i] - b->limb[i]; }
44 void gf_bias(gf a, int amt)
46 uint32_t co1 = ((1ull << 28) - 1) * amt, co2 = co1 - amt;
47 uint32x4_t lo = { co1, co1, co1, co1 }, hi = {
49 uint32x4_t *aa = (uint32x4_t *) a;
56 void gf_weak_reduce(gf a)
58 uint64_t mask = (1ull << 28) - 1;
59 uint64_t tmp = a->limb[15] >> 28;
61 for (unsigned int i = 15; i > 0; i--) {
62 a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28);
64 a->limb[0] = (a->limb[0] & mask) + tmp;