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/* Copyright (c) 2014-2016 Cryptography Research, Inc.
* Released under the MIT License. See LICENSE.txt for license information.
*/
#define GF_HEADROOM 9999 /* Everything is reduced anyway */
#define FIELD_LITERAL(a,b,c,d,e,f,g,h) {{a,b,c,d,e,f,g,h}}
#define LIMB_PLACE_VALUE(i) 56
void crypton_gf_add_RAW (gf out, const gf a, const gf b) {
for (unsigned int i=0; i<8; i++) {
out->limb[i] = a->limb[i] + b->limb[i];
}
crypton_gf_weak_reduce(out);
}
void crypton_gf_sub_RAW (gf out, const gf a, const gf b) {
uint64_t co1 = ((1ull<<56)-1)*2, co2 = co1-2;
for (unsigned int i=0; i<8; i++) {
out->limb[i] = a->limb[i] - b->limb[i] + ((i==4) ? co2 : co1);
}
crypton_gf_weak_reduce(out);
}
void crypton_gf_bias (gf a, int amt) {
(void) a;
(void) amt;
}
void crypton_gf_weak_reduce (gf a) {
uint64_t mask = (1ull<<56) - 1;
uint64_t tmp = a->limb[7] >> 56;
a->limb[4] += tmp;
for (unsigned int i=7; i>0; i--) {
a->limb[i] = (a->limb[i] & mask) + (a->limb[i-1]>>56);
}
a->limb[0] = (a->limb[0] & mask) + tmp;
}
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