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/* $OpenBSD: math_ec2n.h,v 1.7 2004/05/23 18:17:56 hshoexer Exp $ */
/* $EOM: math_ec2n.h,v 1.4 1999/04/17 23:20:37 niklas 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.
*
* 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) do \
{ \
int _i_; \
\
_i_ = (k)->inf; \
(k)->inf = (n)->inf; \
(n)->inf = _i_; \
B2N_SWAP ((k)->x, (n)->x); \
B2N_SWAP ((k)->y, (n)->y); \
} \
while (0)
void ec2np_init(ec2np_ptr);
void ec2np_clear(ec2np_ptr);
int 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);
int 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. */
int ec2np_add(ec2np_ptr, ec2np_ptr, ec2np_ptr, ec2ng_ptr);
int ec2np_find_y(ec2np_ptr, ec2ng_ptr);
int ec2np_ison(ec2np_ptr, ec2ng_ptr);
int ec2np_mul(ec2np_ptr, ec2np_ptr, b2n_ptr, ec2ng_ptr);
int ec2np_right(b2n_ptr n, ec2np_ptr, ec2ng_ptr);
#endif /* _MATH_2N_H_ */
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