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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 2
#define LIMB(x) (x##ull)&((1ull<<28)-1), (x##ull)>>28
#define FIELD_LITERAL(a,b,c,d,e,f,g,h) \
{{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}}
#define LIMB_PLACE_VALUE(i) 28
void gf_add_RAW(gf out, const gf a, const gf b)
{
for (unsigned int i = 0; i < sizeof(*out) / sizeof(uint32xn_t); i++) {
((uint32xn_t *) out)[i] =
((const uint32xn_t *)a)[i] + ((const uint32xn_t *)b)[i];
}
}
void gf_sub_RAW(gf out, const gf a, const gf b)
{
for (unsigned int i = 0; i < sizeof(*out) / sizeof(uint32xn_t); i++) {
((uint32xn_t *) out)[i] =
((const uint32xn_t *)a)[i] - ((const uint32xn_t *)b)[i];
}
}
void gf_bias(gf a, int amt)
{
uint32_t co1 = ((1ull << 28) - 1) * amt, co2 = co1 - amt;
uint32x4_t lo = { co1, co1, co1, co1 }, hi = {
co2, co1, co1, co1};
uint32x4_t *aa = (uint32x4_t *) a;
aa[0] += lo;
aa[1] += lo;
aa[2] += hi;
aa[3] += lo;
}
void gf_weak_reduce(gf a)
{
uint64_t mask = (1ull << 28) - 1;
uint64_t tmp = a->limb[15] >> 28;
a->limb[8] += tmp;
for (unsigned int i = 15; i > 0; i--) {
a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28);
}
a->limb[0] = (a->limb[0] & mask) + tmp;
}
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