/* * Copyright 2017 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; }