1 /* $OpenBSD: ec_oct.c,v 1.8 2021/04/20 17:34:33 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_lcl.h"
72
73 int
EC_POINT_set_compressed_coordinates(const EC_GROUP * group,EC_POINT * point,const BIGNUM * x,int y_bit,BN_CTX * ctx)74 EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point,
75 const BIGNUM *x, int y_bit, BN_CTX *ctx)
76 {
77 if (group->meth->point_set_compressed_coordinates == NULL &&
78 !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
79 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
80 return 0;
81 }
82 if (group->meth != point->meth) {
83 ECerror(EC_R_INCOMPATIBLE_OBJECTS);
84 return 0;
85 }
86 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
87 if (group->meth->field_type == NID_X9_62_prime_field)
88 return ec_GFp_simple_set_compressed_coordinates(
89 group, point, x, y_bit, ctx);
90 else
91 #ifdef OPENSSL_NO_EC2M
92 {
93 ECerror(EC_R_GF2M_NOT_SUPPORTED);
94 return 0;
95 }
96 #else
97 return ec_GF2m_simple_set_compressed_coordinates(
98 group, point, x, y_bit, ctx);
99 #endif
100 }
101 if (!group->meth->point_set_compressed_coordinates(group, point, x,
102 y_bit, ctx))
103 return 0;
104 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
105 ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
106 return 0;
107 }
108 return 1;
109 }
110
111 int
EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP * group,EC_POINT * point,const BIGNUM * x,int y_bit,BN_CTX * ctx)112 EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
113 const BIGNUM *x, int y_bit, BN_CTX *ctx)
114 {
115 return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
116 }
117
118 #ifndef OPENSSL_NO_EC2M
119 int
EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP * group,EC_POINT * point,const BIGNUM * x,int y_bit,BN_CTX * ctx)120 EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
121 const BIGNUM *x, int y_bit, BN_CTX *ctx)
122 {
123 return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
124 }
125 #endif
126
127 size_t
EC_POINT_point2oct(const EC_GROUP * group,const EC_POINT * point,point_conversion_form_t form,unsigned char * buf,size_t len,BN_CTX * ctx)128 EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
129 point_conversion_form_t form,
130 unsigned char *buf, size_t len, BN_CTX *ctx)
131 {
132 if (group->meth->point2oct == 0
133 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
134 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
135 return 0;
136 }
137 if (group->meth != point->meth) {
138 ECerror(EC_R_INCOMPATIBLE_OBJECTS);
139 return 0;
140 }
141 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
142 if (group->meth->field_type == NID_X9_62_prime_field)
143 return ec_GFp_simple_point2oct(group, point,
144 form, buf, len, ctx);
145 else
146 #ifdef OPENSSL_NO_EC2M
147 {
148 ECerror(EC_R_GF2M_NOT_SUPPORTED);
149 return 0;
150 }
151 #else
152 return ec_GF2m_simple_point2oct(group, point,
153 form, buf, len, ctx);
154 #endif
155 }
156 return group->meth->point2oct(group, point, form, buf, len, ctx);
157 }
158
159 int
EC_POINT_oct2point(const EC_GROUP * group,EC_POINT * point,const unsigned char * buf,size_t len,BN_CTX * ctx)160 EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
161 const unsigned char *buf, size_t len, BN_CTX *ctx)
162 {
163 if (group->meth->oct2point == 0 &&
164 !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
165 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
166 return 0;
167 }
168 if (group->meth != point->meth) {
169 ECerror(EC_R_INCOMPATIBLE_OBJECTS);
170 return 0;
171 }
172 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
173 if (group->meth->field_type == NID_X9_62_prime_field)
174 return ec_GFp_simple_oct2point(group, point,
175 buf, len, ctx);
176 else
177 #ifdef OPENSSL_NO_EC2M
178 {
179 ECerror(EC_R_GF2M_NOT_SUPPORTED);
180 return 0;
181 }
182 #else
183 return ec_GF2m_simple_oct2point(group, point,
184 buf, len, ctx);
185 #endif
186 }
187 return group->meth->oct2point(group, point, buf, len, ctx);
188 }
189