ec_oct.c revision 1.12 
1/* $OpenBSD: ec_oct.c,v 1.12 2023/04/25 19:53:30 tb Exp $ */
2/*
3 * Originally written by Bodo Moeller for the OpenSSL project.
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    openssl-core@openssl.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58/* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60 * Binary polynomial ECC support in OpenSSL originally developed by
61 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62 */
63
64#include <string.h>
65
66#include <openssl/opensslconf.h>
67
68#include <openssl/err.h>
69#include <openssl/opensslv.h>
70
71#include "ec_local.h"
72
73int
74EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point,
75    const BIGNUM *x, int y_bit, BN_CTX *ctx_in)
76{
77	BN_CTX *ctx;
78	int ret = 0;
79
80	if ((ctx = ctx_in) == NULL)
81		ctx = BN_CTX_new();
82	if (ctx == NULL)
83		goto err;
84
85	if (group->meth->point_set_compressed_coordinates == NULL) {
86		ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
87		goto err;
88	}
89	if (group->meth != point->meth) {
90		ECerror(EC_R_INCOMPATIBLE_OBJECTS);
91		goto err;
92	}
93	ret = group->meth->point_set_compressed_coordinates(group, point,
94	    x, y_bit, ctx);
95
96 err:
97	if (ctx != ctx_in)
98		BN_CTX_free(ctx);
99
100	return ret;
101}
102
103int
104EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
105    const BIGNUM *x, int y_bit, BN_CTX *ctx)
106{
107	return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
108}
109
110size_t
111EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
112    point_conversion_form_t form, unsigned char *buf, size_t len,
113    BN_CTX *ctx_in)
114{
115	BN_CTX *ctx;
116	int ret = 0;
117
118	if ((ctx = ctx_in) == NULL)
119		ctx = BN_CTX_new();
120	if (ctx == NULL)
121		goto err;
122
123	if (group->meth->point2oct == NULL) {
124		ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
125		goto err;
126	}
127	if (group->meth != point->meth) {
128		ECerror(EC_R_INCOMPATIBLE_OBJECTS);
129		goto err;
130	}
131	ret = group->meth->point2oct(group, point, form, buf, len, ctx);
132
133 err:
134	if (ctx != ctx_in)
135		BN_CTX_free(ctx);
136
137	return ret;
138}
139
140int
141EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
142    const unsigned char *buf, size_t len, BN_CTX *ctx_in)
143{
144	BN_CTX *ctx;
145	int ret = 0;
146
147	if ((ctx = ctx_in) == NULL)
148		ctx = BN_CTX_new();
149	if (ctx == NULL)
150		goto err;
151
152	if (group->meth->oct2point == NULL) {
153		ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
154		goto err;
155	}
156	if (group->meth != point->meth) {
157		ECerror(EC_R_INCOMPATIBLE_OBJECTS);
158		goto err;
159	}
160	ret = group->meth->oct2point(group, point, buf, len, ctx);
161
162 err:
163	if (ctx != ctx_in)
164		BN_CTX_free(ctx);
165
166	return ret;
167}
168