| /* |
| * 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 |
| */ |
| |
| #ifndef HEADER_ARCH_32_F_IMPL_H |
| # define HEADER_ARCH_32_F_IMPL_H |
| |
| # define GF_HEADROOM 2 |
| # define LIMB(x) ((x) & ((1 << 28) - 1)), ((x) >> 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) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < NLIMBS; i++) |
| out->limb[i] = a->limb[i] + b->limb[i]; |
| } |
| |
| void gf_sub_RAW(gf out, const gf a, const gf b) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < NLIMBS; i++) |
| out->limb[i] = a->limb[i] - b->limb[i]; |
| } |
| |
| void gf_bias(gf a, int amt) |
| { |
| unsigned int i; |
| uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt; |
| |
| for (i = 0; i < NLIMBS; i++) |
| a->limb[i] += (i == NLIMBS / 2) ? co2 : co1; |
| } |
| |
| void gf_weak_reduce(gf a) |
| { |
| uint32_t mask = (1 << 28) - 1; |
| uint32_t tmp = a->limb[NLIMBS - 1] >> 28; |
| unsigned int i; |
| |
| a->limb[NLIMBS / 2] += tmp; |
| for (i = NLIMBS - 1; i > 0; i--) |
| a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28); |
| a->limb[0] = (a->limb[0] & mask) + tmp; |
| } |
| |
| #endif /* HEADER_ARCH_32_F_IMPL_H */ |