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/* $OpenBSD: ec_internal.h,v 1.1 2025/05/25 05:12:05 jsing Exp $ */
/*
* Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and 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.
*/
#include <openssl/bn.h>
#ifndef HEADER_EC_INTERNAL_H
#define HEADER_EC_INTERNAL_H
#define EC_FIELD_ELEMENT_MAX_BITS 521
#define EC_FIELD_ELEMENT_MAX_BYTES \
(EC_FIELD_ELEMENT_MAX_BITS + 7) / 8
#define EC_FIELD_ELEMENT_MAX_WORDS \
((EC_FIELD_ELEMENT_MAX_BYTES + BN_BYTES - 1) / BN_BYTES)
typedef struct {
BN_ULONG w[EC_FIELD_ELEMENT_MAX_WORDS];
} EC_FIELD_ELEMENT;
typedef struct {
size_t n;
EC_FIELD_ELEMENT m;
EC_FIELD_ELEMENT rr;
BN_ULONG minv0;
} EC_FIELD_MODULUS;
int ec_field_modulus_from_bn(EC_FIELD_MODULUS *fm, const BIGNUM *bn,
BN_CTX *ctx);
int ec_field_element_from_bn(const EC_FIELD_MODULUS *fm, const EC_GROUP *group,
EC_FIELD_ELEMENT *fe, const BIGNUM *bn, BN_CTX *ctx);
int ec_field_element_to_bn(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *fe,
BIGNUM *bn, BN_CTX *ctx);
void ec_field_element_copy(EC_FIELD_ELEMENT *dst, const EC_FIELD_ELEMENT *src);
int ec_field_element_equal(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *a,
const EC_FIELD_ELEMENT *b);
int ec_field_element_is_zero(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *fe);
void ec_field_element_add(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
void ec_field_element_sub(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
void ec_field_element_mul(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
void ec_field_element_sqr(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
const EC_FIELD_ELEMENT *a);
#endif
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