1 /* Copyright (c) 2014-2016 Cryptography Research, Inc.
2 * Released under the MIT License. See LICENSE.txt for license information.
6 #define LIMB(x) (x##ull)&((1ull<<28)-1), (x##ull)>>28
7 #define FIELD_LITERAL(a,b,c,d,e,f,g,h) \
8 {{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}}
10 #define LIMB_PLACE_VALUE(i) 28
12 void gf_add_RAW (gf out, const gf a, const gf b) {
13 for (unsigned int i=0; i<sizeof(*out)/sizeof(uint32xn_t); i++) {
14 ((uint32xn_t*)out)[i] = ((const uint32xn_t*)a)[i] + ((const uint32xn_t*)b)[i];
17 for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
18 out->limb[i] = a->limb[i] + b->limb[i];
23 void gf_sub_RAW (gf out, const gf a, const gf b) {
24 for (unsigned int i=0; i<sizeof(*out)/sizeof(uint32xn_t); i++) {
25 ((uint32xn_t*)out)[i] = ((const uint32xn_t*)a)[i] - ((const uint32xn_t*)b)[i];
28 for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
29 out->limb[i] = a->limb[i] - b->limb[i];
34 void gf_bias (gf a, int amt) {
35 uint32_t co1 = ((1ull<<28)-1)*amt, co2 = co1-amt;
36 uint32x4_t lo = {co1,co1,co1,co1}, hi = {co2,co1,co1,co1};
37 uint32x4_t *aa = (uint32x4_t*) a;
44 void gf_weak_reduce (gf a) {
45 uint64_t mask = (1ull<<28) - 1;
46 uint64_t tmp = a->limb[15] >> 28;
48 for (unsigned int i=15; i>0; i--) {
49 a->limb[i] = (a->limb[i] & mask) + (a->limb[i-1]>>28);
51 a->limb[0] = (a->limb[0] & mask) + tmp;