55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* Copyright (c) 2014, Intel Corporation.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#ifndef OPENSSL_HEADER_EC_ECP_NISTZ256_H
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#define OPENSSL_HEADER_EC_ECP_NISTZ256_H
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#include "../../limbs/limbs.h"
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// Keep this in sync with p256.rs.
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#if defined(OPENSSL_AARCH64) || defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
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#define GFp_USE_LARGE_TABLE
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#endif
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#define P256_LIMBS (256u / LIMB_BITS)
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typedef struct {
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Limb X[P256_LIMBS];
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Limb Y[P256_LIMBS];
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Limb Z[P256_LIMBS];
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} P256_POINT;
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#if defined(GFp_USE_LARGE_TABLE)
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typedef struct {
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Limb X[P256_LIMBS];
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Limb Y[P256_LIMBS];
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} P256_POINT_AFFINE;
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#endif
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typedef Limb PRECOMP256_ROW[64 * 2 * P256_LIMBS]; // 64 (x, y) entries.
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void GFp_nistz256_mul_mont(Limb res[P256_LIMBS], const Limb a[P256_LIMBS],
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const Limb b[P256_LIMBS]);
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void GFp_nistz256_sqr_mont(Limb res[P256_LIMBS], const Limb a[P256_LIMBS]);
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/* Functions that perform constant time access to the precomputed tables */
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void GFp_nistz256_select_w5(P256_POINT *out, const P256_POINT table[16],
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crypto_word index);
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#if defined(GFp_USE_LARGE_TABLE)
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void GFp_nistz256_select_w7(P256_POINT_AFFINE *out, const PRECOMP256_ROW table, crypto_word index);
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#endif
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#endif /* OPENSSL_HEADER_EC_ECP_NISTZ256_H */
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