ref: 2bbc75bddc6f2a07056ff017108e35f14061041b
dir: /third_party/boringssl/src/crypto/curve25519/internal.h/
/* Copyright (c) 2020, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#ifndef OPENSSL_HEADER_CURVE25519_INTERNAL_H
#define OPENSSL_HEADER_CURVE25519_INTERNAL_H
#if defined(__cplusplus)
extern "C" {
#endif
#include <openssl/base.h>
#include "../internal.h"
#if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_APPLE)
#define BORINGSSL_X25519_NEON
// x25519_NEON is defined in asm/x25519-arm.S.
void x25519_NEON(uint8_t out[32], const uint8_t scalar[32],
const uint8_t point[32]);
#endif
#if defined(BORINGSSL_HAS_UINT128)
#define BORINGSSL_CURVE25519_64BIT
#endif
#if defined(BORINGSSL_CURVE25519_64BIT)
// fe means field element. Here the field is \Z/(2^255-19). An element t,
// entries t[0]...t[4], represents the integer t[0]+2^51 t[1]+2^102 t[2]+2^153
// t[3]+2^204 t[4].
// fe limbs are bounded by 1.125*2^51.
// Multiplication and carrying produce fe from fe_loose.
typedef struct fe { uint64_t v[5]; } fe;
// fe_loose limbs are bounded by 3.375*2^51.
// Addition and subtraction produce fe_loose from (fe, fe).
typedef struct fe_loose { uint64_t v[5]; } fe_loose;
#else
// fe means field element. Here the field is \Z/(2^255-19). An element t,
// entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
// t[3]+2^102 t[4]+...+2^230 t[9].
// fe limbs are bounded by 1.125*2^26,1.125*2^25,1.125*2^26,1.125*2^25,etc.
// Multiplication and carrying produce fe from fe_loose.
typedef struct fe { uint32_t v[10]; } fe;
// fe_loose limbs are bounded by 3.375*2^26,3.375*2^25,3.375*2^26,3.375*2^25,etc.
// Addition and subtraction produce fe_loose from (fe, fe).
typedef struct fe_loose { uint32_t v[10]; } fe_loose;
#endif
// ge means group element.
//
// Here the group is the set of pairs (x,y) of field elements (see fe.h)
// satisfying -x^2 + y^2 = 1 + d x^2y^2
// where d = -121665/121666.
//
// Representations:
// ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
// ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
// ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
// ge_precomp (Duif): (y+x,y-x,2dxy)
typedef struct {
fe X;
fe Y;
fe Z;
} ge_p2;
typedef struct {
fe X;
fe Y;
fe Z;
fe T;
} ge_p3;
typedef struct {
fe_loose X;
fe_loose Y;
fe_loose Z;
fe_loose T;
} ge_p1p1;
typedef struct {
fe_loose yplusx;
fe_loose yminusx;
fe_loose xy2d;
} ge_precomp;
typedef struct {
fe_loose YplusX;
fe_loose YminusX;
fe_loose Z;
fe_loose T2d;
} ge_cached;
void x25519_ge_tobytes(uint8_t s[32], const ge_p2 *h);
int x25519_ge_frombytes_vartime(ge_p3 *h, const uint8_t s[32]);
void x25519_ge_p3_to_cached(ge_cached *r, const ge_p3 *p);
void x25519_ge_p1p1_to_p2(ge_p2 *r, const ge_p1p1 *p);
void x25519_ge_p1p1_to_p3(ge_p3 *r, const ge_p1p1 *p);
void x25519_ge_add(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
void x25519_ge_sub(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
void x25519_ge_scalarmult_small_precomp(
ge_p3 *h, const uint8_t a[32], const uint8_t precomp_table[15 * 2 * 32]);
void x25519_ge_scalarmult_base(ge_p3 *h, const uint8_t a[32]);
void x25519_ge_scalarmult(ge_p2 *r, const uint8_t *scalar, const ge_p3 *A);
void x25519_sc_reduce(uint8_t s[64]);
enum spake2_state_t {
spake2_state_init = 0,
spake2_state_msg_generated,
spake2_state_key_generated,
};
struct spake2_ctx_st {
uint8_t private_key[32];
uint8_t my_msg[32];
uint8_t password_scalar[32];
uint8_t password_hash[64];
uint8_t *my_name;
size_t my_name_len;
uint8_t *their_name;
size_t their_name_len;
enum spake2_role_t my_role;
enum spake2_state_t state;
char disable_password_scalar_hack;
};
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_CURVE25519_INTERNAL_H