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/*
* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2014-2016 Cryptography Research, Inc.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
* Originally written by Mike Hamburg
*/
#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 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];
gf_weak_reduce(out);
}
void 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);
gf_weak_reduce(out);
}
void gf_bias(gf a, int amt)
{
(void)a;
(void)amt;
}
void 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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