63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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// Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
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// Copyright (c) 2014, Intel Corporation. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Originally written by Shay Gueron (1, 2), and Vlad Krasnov (1)
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// (1) Intel Corporation, Israel Development Center, Haifa, Israel
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// (2) University of Haifa, Israel
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//
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// Reference:
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// S.Gueron and V.Krasnov, "Fast Prime Field Elliptic Curve Cryptography with
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// 256 Bit Primes"
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#ifndef OPENSSL_HEADER_EC_P256_SHARED_H
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#define OPENSSL_HEADER_EC_P256_SHARED_H
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#include "ring-core/base.h"
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#include "../bn/internal.h"
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#if !defined(OPENSSL_NO_ASM) && \
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(defined(OPENSSL_X86_64) || defined(OPENSSL_AARCH64)) && \
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!defined(OPENSSL_SMALL)
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# define OPENSSL_USE_NISTZ256
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#endif
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// P-256 field operations.
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//
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// An element mod P in P-256 is represented as a little-endian array of
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// |P256_LIMBS| |BN_ULONG|s, spanning the full range of values.
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//
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// The following functions take fully-reduced inputs mod P and give
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// fully-reduced outputs. They may be used in-place.
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#define P256_LIMBS (256 / BN_BITS2)
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// A P256_POINT represents a P-256 point in Jacobian coordinates.
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typedef struct {
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BN_ULONG X[P256_LIMBS];
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BN_ULONG Y[P256_LIMBS];
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BN_ULONG Z[P256_LIMBS];
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} P256_POINT;
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typedef unsigned char P256_SCALAR_BYTES[33];
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static inline void p256_scalar_bytes_from_limbs(
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P256_SCALAR_BYTES bytes_out, const BN_ULONG limbs[P256_LIMBS]) {
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OPENSSL_memcpy(bytes_out, limbs, 32);
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bytes_out[32] = 0;
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}
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#endif /* !defined(OPENSSL_USE_NISTZ256) */
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