7114a5a17a
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/5105)
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2014-2016 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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#define GF_HEADROOM 2
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#define LIMB(x) (x)&((1<<28)-1), (x)>>28
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#define FIELD_LITERAL(a,b,c,d,e,f,g,h) \
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{{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}}
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#define LIMB_PLACE_VALUE(i) 28
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void gf_add_RAW(gf out, const gf a, const gf b)
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{
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unsigned int i;
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for (i = 0; i < NLIMBS; i++) {
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out->limb[i] = a->limb[i] + b->limb[i];
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}
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}
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void gf_sub_RAW(gf out, const gf a, const gf b)
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{
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unsigned int i;
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for (i = 0; i < sizeof(*out) / sizeof(out->limb[0]); i++) {
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out->limb[i] = a->limb[i] - b->limb[i];
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}
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}
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void gf_bias(gf a, int amt)
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{
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unsigned int i;
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uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt;
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for (i = 0; i < sizeof(*a) / sizeof(a->limb[0]); i++)
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a->limb[i] += (i == sizeof(*a) / sizeof(a->limb[0]) / 2) ? co2 : co1;
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}
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void gf_weak_reduce(gf a)
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{
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uint32_t mask = (1 << 28) - 1;
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uint32_t tmp = a->limb[15] >> 28;
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unsigned int i;
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a->limb[8] += tmp;
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for (i = 15; i > 0; i--)
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a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28);
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a->limb[0] = (a->limb[0] & mask) + tmp;
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}
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