mirror of
https://github.com/zerotier/ZeroTierOne.git
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117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/* Copyright (c) 2020, Google Inc.
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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_CURVE25519_INTERNAL_H
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#define OPENSSL_HEADER_CURVE25519_INTERNAL_H
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#include <GFp/base.h>
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#include "../internal.h"
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#if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_APPLE)
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#define BORINGSSL_X25519_NEON
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// x25519_NEON is defined in asm/x25519-arm.S.
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void GFp_x25519_NEON(uint8_t out[32], const uint8_t scalar[32],
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const uint8_t point[32]);
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#endif
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#if defined(BORINGSSL_HAS_UINT128)
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#define BORINGSSL_CURVE25519_64BIT
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#endif
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#if defined(BORINGSSL_CURVE25519_64BIT)
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// An element t,
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// entries t[0]...t[4], represents the integer t[0]+2^51 t[1]+2^102 t[2]+2^153
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// t[3]+2^204 t[4].
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// fe limbs are bounded by 1.125*2^51.
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// fe_loose limbs are bounded by 3.375*2^51.
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typedef uint64_t fe_limb_t;
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#define FE_NUM_LIMBS 5
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#else
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// An element t,
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// entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
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// t[3]+2^102 t[4]+...+2^230 t[9].
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// fe limbs are bounded by 1.125*2^26,1.125*2^25,1.125*2^26,1.125*2^25,etc.
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// fe_loose limbs are bounded by 3.375*2^26,3.375*2^25,3.375*2^26,3.375*2^25,etc.
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typedef uint32_t fe_limb_t;
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#define FE_NUM_LIMBS 10
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#endif
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// fe means field element. Here the field is \Z/(2^255-19).
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// Multiplication and carrying produce fe from fe_loose.
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// Keep in sync with `Elem` and `ELEM_LIMBS` in curve25519/ops.rs.
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typedef struct fe { fe_limb_t v[FE_NUM_LIMBS]; } fe;
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// Addition and subtraction produce fe_loose from (fe, fe).
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// Keep in sync with `Elem` and `ELEM_LIMBS` in curve25519/ops.rs.
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typedef struct fe_loose { fe_limb_t v[FE_NUM_LIMBS]; } fe_loose;
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static inline void fe_limbs_copy(fe_limb_t r[], const fe_limb_t a[]) {
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for (size_t i = 0; i < FE_NUM_LIMBS; ++i) {
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r[i] = a[i];
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}
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}
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// ge means group element.
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//
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// Here the group is the set of pairs (x,y) of field elements (see fe.h)
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// satisfying -x^2 + y^2 = 1 + d x^2y^2
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// where d = -121665/121666.
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//
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// Representations:
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// ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
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// ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
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// ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
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// ge_precomp (Duif): (y+x,y-x,2dxy)
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// Keep in sync with `Point` in curve25519/ops.rs.
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typedef struct {
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fe X;
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fe Y;
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fe Z;
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} ge_p2;
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// Keep in sync with `ExtPoint` in curve25519/ops.rs.
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typedef struct {
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fe X;
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fe Y;
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fe Z;
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fe T;
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} ge_p3;
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typedef struct {
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fe_loose X;
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fe_loose Y;
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fe_loose Z;
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fe_loose T;
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} ge_p1p1;
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typedef struct {
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fe_loose yplusx;
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fe_loose yminusx;
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fe_loose xy2d;
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} ge_precomp;
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typedef struct {
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fe_loose YplusX;
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fe_loose YminusX;
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fe_loose Z;
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fe_loose T2d;
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} ge_cached;
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#endif // OPENSSL_HEADER_CURVE25519_INTERNAL_H
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