mirror of https://github.com/openssl/openssl
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright 2017-2022 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 Apache License 2.0 (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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#ifndef OSSL_CRYPTO_EC_CURVE448_ARCH_64_F_IMPL_H
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# define OSSL_CRYPTO_EC_CURVE448_ARCH_64_F_IMPL_H
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# define GF_HEADROOM 9999 /* Everything is reduced anyway */
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# define FIELD_LITERAL(a,b,c,d,e,f,g,h) {{a,b,c,d,e,f,g,h}}
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# define LIMB_PLACE_VALUE(i) 56
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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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gf_weak_reduce(out);
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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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uint64_t co1 = ((1ULL << 56) - 1) * 2, co2 = co1 - 2;
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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] + ((i == NLIMBS / 2) ? co2 : co1);
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gf_weak_reduce(out);
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}
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void gf_bias(gf a, int amt)
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{
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}
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void gf_weak_reduce(gf a)
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{
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uint64_t mask = (1ULL << 56) - 1;
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uint64_t tmp = a->limb[NLIMBS - 1] >> 56;
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unsigned int i;
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a->limb[NLIMBS / 2] += tmp;
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for (i = NLIMBS - 1; i > 0; i--)
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a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 56);
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a->limb[0] = (a->limb[0] & mask) + tmp;
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}
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#endif /* OSSL_CRYPTO_EC_CURVE448_ARCH_64_F_IMPL_H */
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