e907ed4c4b
This reverts commit 3d450d2844. It fails
SDE, looks like a missing CPUID check before using vector instructions.
Change-Id: I6b7dd71d9e5b1f509d2e018bd8be38c973476b4e
Reviewed-on: https://boringssl-review.googlesource.com/c/32864
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
136 lines
4.8 KiB
C
136 lines
4.8 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 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 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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*/
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#ifndef OPENSSL_HEADER_EC_P256_X86_64_H
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#define OPENSSL_HEADER_EC_P256_X86_64_H
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#include <openssl/base.h>
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#include <openssl/bn.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64) && \
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!defined(OPENSSL_SMALL)
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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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// ecp_nistz256_neg sets |res| to -|a| mod P.
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void ecp_nistz256_neg(BN_ULONG res[P256_LIMBS], const BN_ULONG a[P256_LIMBS]);
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// ecp_nistz256_mul_mont sets |res| to |a| * |b| * 2^-256 mod P.
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void ecp_nistz256_mul_mont(BN_ULONG res[P256_LIMBS],
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const BN_ULONG a[P256_LIMBS],
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const BN_ULONG b[P256_LIMBS]);
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// ecp_nistz256_sqr_mont sets |res| to |a| * |a| * 2^-256 mod P.
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void ecp_nistz256_sqr_mont(BN_ULONG res[P256_LIMBS],
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const BN_ULONG a[P256_LIMBS]);
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// ecp_nistz256_from_mont sets |res| to |in|, converted from Montgomery domain
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// by multiplying with 1.
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static inline void ecp_nistz256_from_mont(BN_ULONG res[P256_LIMBS],
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const BN_ULONG in[P256_LIMBS]) {
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static const BN_ULONG ONE[P256_LIMBS] = { 1 };
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ecp_nistz256_mul_mont(res, in, ONE);
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}
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// P-256 scalar operations.
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//
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// The following functions compute modulo N, where N is the order of P-256. They
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// take fully-reduced inputs and give fully-reduced outputs.
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// ecp_nistz256_ord_mul_mont sets |res| to |a| * |b| where inputs and outputs
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// are in Montgomery form. That is, |res| is |a| * |b| * 2^-256 mod N.
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void ecp_nistz256_ord_mul_mont(BN_ULONG res[P256_LIMBS],
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const BN_ULONG a[P256_LIMBS],
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const BN_ULONG b[P256_LIMBS]);
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// ecp_nistz256_ord_sqr_mont sets |res| to |a|^(2*|rep|) where inputs and
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// outputs are in Montgomery form. That is, |res| is
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// (|a| * 2^-256)^(2*|rep|) * 2^256 mod N.
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void ecp_nistz256_ord_sqr_mont(BN_ULONG res[P256_LIMBS],
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const BN_ULONG a[P256_LIMBS], int rep);
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// P-256 point operations.
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//
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// The following functions may be used in-place. All coordinates are in the
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// Montgomery domain.
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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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// A P256_POINT_AFFINE represents a P-256 point in affine coordinates. Infinity
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// is encoded as (0, 0).
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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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} P256_POINT_AFFINE;
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// ecp_nistz256_select_w5 sets |*val| to |in_t[index-1]| if 1 <= |index| <= 16
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// and all zeros (the point at infinity) if |index| is 0. This is done in
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// constant time.
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void ecp_nistz256_select_w5(P256_POINT *val, const P256_POINT in_t[16],
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int index);
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// ecp_nistz256_select_w7 sets |*val| to |in_t[index-1]| if 1 <= |index| <= 64
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// and all zeros (the point at infinity) if |index| is 0. This is done in
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// constant time.
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void ecp_nistz256_select_w7(P256_POINT_AFFINE *val,
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const P256_POINT_AFFINE in_t[64], int index);
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// ecp_nistz256_point_double sets |r| to |a| doubled.
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void ecp_nistz256_point_double(P256_POINT *r, const P256_POINT *a);
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// ecp_nistz256_point_add adds |a| to |b| and places the result in |r|.
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void ecp_nistz256_point_add(P256_POINT *r, const P256_POINT *a,
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const P256_POINT *b);
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// ecp_nistz256_point_add_affine adds |a| to |b| and places the result in
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// |r|. |a| and |b| must not represent the same point unless they are both
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// infinity.
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void ecp_nistz256_point_add_affine(P256_POINT *r, const P256_POINT *a,
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const P256_POINT_AFFINE *b);
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#endif /* !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64) && \
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!defined(OPENSSL_SMALL) */
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#if defined(__cplusplus)
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} // extern C++
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#endif
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#endif // OPENSSL_HEADER_EC_P256_X86_64_H
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