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/* $OpenBSD: math_ec2n.h,v 1.3 1998/11/17 11:10:16 niklas Exp $ */
/* $EOM: math_ec2n.h,v 1.3 1998/07/17 16:32:16 provos Exp $ */
/*
* Copyright (c) 1998 Niels Provos. 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 acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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 code was written under funding by Ericsson Radio Systems.
*/
#ifndef _MATH_EC2N_H
#define _MATH_EC2N_H_
/* Definitions for points on an elliptic curve */
typedef struct {
int inf; /* Are we the point at infinity ? */
b2n_t x, y;
} _ec2n_point;
typedef _ec2n_point *ec2np_ptr;
typedef _ec2n_point ec2np_t[1];
#define EC2NP_SWAP(k,n) {int _i_; _i_ = (k)->inf; (k)->inf = (n)->inf; \
(n)->inf = _i_; B2N_SWAP ((k)->x, (n)->x); B2N_SWAP ((k)->y, (n)->y);}
void ec2np_init (ec2np_ptr);
void ec2np_clear (ec2np_ptr);
void ec2np_set (ec2np_ptr, ec2np_ptr);
#define ec2np_set_x_ui(n, y) b2n_set_ui ((n)->x, y)
#define ec2np_set_y_ui(n, x) b2n_set_ui ((n)->y, x)
#define ec2np_set_x_str(n, y) b2n_set_str ((n)->x, y)
#define ec2np_set_y_str(n, x) b2n_set_str ((n)->y, x)
/* Definitions for the group to which the points to belong to */
typedef struct {
b2n_t a, b, p;
} _ec2n_group;
typedef _ec2n_group *ec2ng_ptr;
typedef _ec2n_group ec2ng_t[1];
void ec2ng_init (ec2ng_ptr);
void ec2ng_clear (ec2ng_ptr);
void ec2ng_set (ec2ng_ptr, ec2ng_ptr);
#define ec2ng_set_a_ui(n, x) b2n_set_ui ((n)->a, x)
#define ec2ng_set_b_ui(n, x) b2n_set_ui ((n)->b, x)
#define ec2ng_set_p_ui(n, x) b2n_set_ui ((n)->p, x)
#define ec2ng_set_a_str(n, x) b2n_set_str ((n)->a, x)
#define ec2ng_set_b_str(n, x) b2n_set_str ((n)->b, x)
#define ec2ng_set_p_str(n, x) b2n_set_str ((n)->p, x)
/* Functions for computing on the elliptic group */
void ec2np_right (b2n_ptr n, ec2np_ptr, ec2ng_ptr);
int ec2np_ison (ec2np_ptr, ec2ng_ptr);
int ec2np_find_y (ec2np_ptr, ec2ng_ptr);
void ec2np_add (ec2np_ptr, ec2np_ptr, ec2np_ptr, ec2ng_ptr);
void ec2np_mul (ec2np_ptr, ec2np_ptr, b2n_ptr, ec2ng_ptr);
#endif /* _MATH_2N_H_ */
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