cb5ed32665
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/5105)
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/*
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* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2014 Cryptography Research, Inc.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*
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* Originally written by Mike Hamburg
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*/
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#include "field.h"
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void gf_mul(gf_s * RESTRICT cs, const gf as, const gf bs)
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{
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const uint32_t *a = as->limb, *b = bs->limb;
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uint32_t *c = cs->limb;
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uint64_t accum0 = 0, accum1 = 0, accum2 = 0;
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uint32_t mask = (1 << 28) - 1;
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uint32_t aa[8], bb[8];
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int i, j;
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for (i = 0; i < 8; i++) {
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aa[i] = a[i] + a[i + 8];
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bb[i] = b[i] + b[i + 8];
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}
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for (j = 0; j < 8; j++) {
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accum2 = 0;
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for (i = 0; i < j + 1; i++) {
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accum2 += widemul(a[j - i], b[i]);
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accum1 += widemul(aa[j - i], bb[i]);
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accum0 += widemul(a[8 + j - i], b[8 + i]);
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}
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accum1 -= accum2;
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accum0 += accum2;
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accum2 = 0;
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for (i = j + 1; i < 8; i++) {
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accum0 -= widemul(a[8 + j - i], b[i]);
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accum2 += widemul(aa[8 + j - i], bb[i]);
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accum1 += widemul(a[16 + j - i], b[8 + i]);
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}
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accum1 += accum2;
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accum0 += accum2;
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c[j] = ((uint32_t)(accum0)) & mask;
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c[j + 8] = ((uint32_t)(accum1)) & mask;
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accum0 >>= 28;
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accum1 >>= 28;
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}
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accum0 += accum1;
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accum0 += c[8];
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accum1 += c[0];
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c[8] = ((uint32_t)(accum0)) & mask;
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c[0] = ((uint32_t)(accum1)) & mask;
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accum0 >>= 28;
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accum1 >>= 28;
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c[9] += ((uint32_t)(accum0));
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c[1] += ((uint32_t)(accum1));
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}
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void gf_mulw_unsigned(gf_s * RESTRICT cs, const gf as, uint32_t b)
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{
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const uint32_t *a = as->limb;
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uint32_t *c = cs->limb;
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uint64_t accum0 = 0, accum8 = 0;
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uint32_t mask = (1 << 28) - 1;
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int i;
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assert(b < 1 << 28);
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for (i = 0; i < 8; i++) {
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accum0 += widemul(b, a[i]);
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accum8 += widemul(b, a[i + 8]);
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c[i] = accum0 & mask;
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accum0 >>= 28;
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c[i + 8] = accum8 & mask;
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accum8 >>= 28;
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}
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accum0 += accum8 + c[8];
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c[8] = ((uint32_t)accum0) & mask;
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c[9] += (uint32_t)(accum0 >> 28);
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accum8 += c[0];
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c[0] = ((uint32_t)accum8) & mask;
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c[1] += (uint32_t)(accum8 >> 28);
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}
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void gf_sqr(gf_s * RESTRICT cs, const gf as)
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{
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gf_mul(cs, as, as); /* Performs better with a dedicated square */
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}
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