/* crypto/ec/ec_lib.c */
/*
 * Originally written by Bodo Moeller for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * Binary polynomial ECC support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#include <string.h>

#include "ec/ec_lcl.h"
#include "sec_alloc.h"


/* functions for EC_GROUP objects */

EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
{
	EC_GROUP *ret;

	if (meth == NULL) {
		//ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
		return NULL;
	}
	if (meth->group_init == 0) {
		//ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return NULL;
	}

	ret = sec_malloc(sizeof *ret);
	if (ret == NULL) {
		//ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
		return NULL;
	}

	ret->meth = meth;

	ret->extra_data = NULL;

	ret->generator = NULL;
	BN_init(&ret->order);
	BN_init(&ret->cofactor);

	ret->curve_name = 0;
	ret->asn1_flag  = 0;
	ret->asn1_form  = POINT_CONVERSION_UNCOMPRESSED;

	ret->seed = NULL;
	ret->seed_len = 0;

	if (!meth->group_init(ret)) {
		sec_free(ret);
		return NULL;
	}

	return ret;
}

void EC_GROUP_free(EC_GROUP *group)
{
	if (!group) return;

	if (group->meth->group_finish != 0)
		group->meth->group_finish(group);

	EC_EX_DATA_free_all_data(&group->extra_data);

	if (group->generator != NULL)
		EC_POINT_free(group->generator);
	BN_free(&group->order);
	BN_free(&group->cofactor);

	if (group->seed)
		sec_free(group->seed);

	sec_free(group);
}

void EC_GROUP_clear_free(EC_GROUP *group)
{
	if (!group) return;

	if (group->meth->group_clear_finish != 0)
		group->meth->group_clear_finish(group);
	else if (group->meth->group_finish != 0)
		group->meth->group_finish(group);

	EC_EX_DATA_clear_free_all_data(&group->extra_data);

	if (group->generator != NULL)
		EC_POINT_clear_free(group->generator);
	BN_clear_free(&group->order);
	BN_clear_free(&group->cofactor);

	if (group->seed) {
		sec_cleanse(group->seed, group->seed_len);
		sec_free(group->seed);
	}

	sec_cleanse(group, sizeof *group);
	sec_free(group);
}

int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
{
	if (generator == NULL) {
		//ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
		return 0   ;
	}

	if (group->generator == NULL) {
		group->generator = EC_POINT_new(group);
		if (group->generator == NULL) return 0;
	}
	if (!EC_POINT_copy(group->generator, generator)) return 0;

	if (order != NULL) {
		if (!BN_copy(&group->order, order))
			return 0;
	} else
		BN_zero(&group->order);

	if (cofactor != NULL) {
		if (!BN_copy(&group->cofactor, cofactor))
			return 0;
	} else
		BN_zero(&group->cofactor);

	return 1;
}

const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
{
	return group->generator;
}


int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
{
	ctx = ctx; // SURC warning fix
	if (!BN_copy(order, &group->order))
		return 0;

	return !BN_is_zero(order);
}

int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
{
	ctx = ctx; // SURC warning fix
	if (!BN_copy(cofactor, &group->cofactor))
		return 0;

	return !BN_is_zero(&group->cofactor);
}


void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
{
	group->curve_name = nid;
}

size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
{
	if (group->seed) {
		sec_free(group->seed);
		group->seed = NULL;
		group->seed_len = 0;
	}

	if (!len || !p)
		return 1;

	if ((group->seed = sec_malloc(len)) == NULL)
		return 0;
	memcpy(group->seed, p, len);
	group->seed_len = len;

	return len;
}

int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
	if (group->meth->group_set_curve == 0) {
		//ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	return group->meth->group_set_curve(group, p, a, b, ctx);
}

#ifndef OPENSSL_NO_EC2M
int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
	if (group->meth->group_set_curve == 0) {
		//ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	return group->meth->group_set_curve(group, p, a, b, ctx);
}
#endif

/* this has 'package' visibility */
void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data, void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
{
	const EC_EXTRA_DATA *d;

	for (d = ex_data; d != NULL; d = d->next) {
		if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
			return d->data;
	}

	return NULL;
}

/* this has 'package' visibility */
void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data, void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
{
	EC_EXTRA_DATA **p;

	if (ex_data == NULL)
		return;

	for (p = ex_data; *p != NULL; p = &((*p)->next)) {
		if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func) {
			EC_EXTRA_DATA *next = (*p)->next;

			(*p)->free_func((*p)->data);
			sec_free(*p);

			*p = next;
			return;
		}
	}
}

/* this has 'package' visibility */
void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data, void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
{
	EC_EXTRA_DATA **p;

	if (ex_data == NULL)
		return;

	for (p = ex_data; *p != NULL; p = &((*p)->next)) {
		if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func) {
			EC_EXTRA_DATA *next = (*p)->next;

			(*p)->clear_free_func((*p)->data);
			sec_free(*p);

			*p = next;
			return;
		}
	}
}

/* this has 'package' visibility */
void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data)
{
	EC_EXTRA_DATA *d;

	if (ex_data == NULL)
		return;

	d = *ex_data;
	while (d) {
		EC_EXTRA_DATA *next = d->next;

		d->free_func(d->data);
		sec_free(d);

		d = next;
	}
	*ex_data = NULL;
}

/* this has 'package' visibility */
void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data)
{
	EC_EXTRA_DATA *d;

	if (ex_data == NULL)
		return;

	d = *ex_data;
	while (d) {
		EC_EXTRA_DATA *next = d->next;

		d->clear_free_func(d->data);
		sec_free(d);

		d = next;
	}
	*ex_data = NULL;
}

/* functions for EC_POINT objects */

EC_POINT *EC_POINT_new(const EC_GROUP *group)
{
	EC_POINT *ret;

	if (group == NULL) {
		//ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
		return NULL;
	}
	if (group->meth->point_init == 0) {
		//ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return NULL;
	}

	ret = sec_malloc(sizeof *ret);
	if (ret == NULL) {
		//ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
		return NULL;
	}

	ret->meth = group->meth;

	if (!ret->meth->point_init(ret)) {
		sec_free(ret);
		return NULL;
	}

	return ret;
}

void EC_POINT_free(EC_POINT *point)
{
	if (!point) return;

	if (point->meth->point_finish != 0)
		point->meth->point_finish(point);
	sec_free(point);
}

void EC_POINT_clear_free(EC_POINT *point)
{
	if (!point) return;

	if (point->meth->point_clear_finish != 0)
		point->meth->point_clear_finish(point);
	else if (point->meth->point_finish != 0)
		point->meth->point_finish(point);
	sec_cleanse(point, sizeof *point);
	sec_free(point);
}

int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
{
	if (dest->meth->point_copy == 0) {
		//ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (dest->meth != src->meth) {
		//ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	if (dest == src)
		return 1;
	return dest->meth->point_copy(dest, src);
}

int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
{
	if (group->meth->point_set_to_infinity == 0) {
		//ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->point_set_to_infinity(group, point);
}


int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
{
	if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
		//ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
}

int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
{
	if (group->meth->point_set_affine_coordinates == 0) {
		//ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
}

int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point, BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
{
	if (group->meth->point_get_affine_coordinates == 0) {
		//LOGE("EC_POINT_get_affine_coordinates_GFp: ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED");
		return 0;
	}
	if (group->meth != point->meth) {
		//LOGE("EC_POINT_get_affine_coordinates_GFp: EC_R_INCOMPATIBLE_OBJECTS");
		return 0;
	}
	return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
}

int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
{
	if (group->meth->add == 0) {
		//ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth)) {
		//ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->add(group, r, a, b, ctx);
}

int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
{
	if (group->meth->dbl == 0) {
		//ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if ((group->meth != r->meth) || (r->meth != a->meth)) {
		//ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->dbl(group, r, a, ctx);
}

int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
{
	if (group->meth->dbl == 0) {
		//ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != a->meth) {
		//ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->invert(group, a, ctx);
}

int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
{
	if (group->meth->is_at_infinity == 0) {
		//ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->is_at_infinity(group, point);
}

int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
{
	if (group->meth->is_on_curve == 0) {
		//ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->is_on_curve(group, point, ctx);
}

int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
{
	if (group->meth->point_cmp == 0) {
		//ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if ((group->meth != a->meth) || (a->meth != b->meth)) {
		//ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->point_cmp(group, a, b, ctx);
}

int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
{
	if (group->meth->make_affine == 0) {
		//ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	if (group->meth != point->meth) {
		//ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
		return 0;
	}
	return group->meth->make_affine(group, point, ctx);
}

int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
{
	size_t i;

	if (group->meth->points_make_affine == 0) {
		//ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
	}
	for (i = 0; i < num; i++) {
		if (group->meth != points[i]->meth) {
			//ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
			return 0;
		}
	}
	return group->meth->points_make_affine(group, num, points, ctx);
}

/* Functions for point multiplication.
 *
 * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
 * otherwise we dispatch through methods.
 */
int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
{
	if (group->meth->mul == 0)
		/* use default */
		return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);

	return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
}

int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
{
	/* just a convenient interface to EC_POINTs_mul() */

	const EC_POINT *points[1];
	const BIGNUM *scalars[1];

	points[0] = point;
	scalars[0] = p_scalar;

	return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
}