1 /* crypto/ec/ec_lib.c */
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/err.h>
67 #include <openssl/opensslv.h>
68
69 #include "ec_lcl.h"
70
EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP * group,EC_POINT * point,const BIGNUM * x,int y_bit,BN_CTX * ctx)71 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
72 const BIGNUM *x, int y_bit, BN_CTX *ctx)
73 {
74 if (group->meth->point_set_compressed_coordinates == 0
75 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
76 {
77 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
78 return 0;
79 }
80 if (group->meth != point->meth)
81 {
82 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
83 return 0;
84 }
85 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
86 {
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 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, 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 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
102 }
103
104 #ifndef OPENSSL_NO_EC2M
EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP * group,EC_POINT * point,const BIGNUM * x,int y_bit,BN_CTX * ctx)105 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
106 const BIGNUM *x, int y_bit, BN_CTX *ctx)
107 {
108 if (group->meth->point_set_compressed_coordinates == 0
109 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
110 {
111 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
112 return 0;
113 }
114 if (group->meth != point->meth)
115 {
116 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
117 return 0;
118 }
119 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
120 {
121 if (group->meth->field_type == NID_X9_62_prime_field)
122 return ec_GFp_simple_set_compressed_coordinates(
123 group, point, x, y_bit, ctx);
124 else
125 return ec_GF2m_simple_set_compressed_coordinates(
126 group, point, x, y_bit, ctx);
127 }
128 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
129 }
130 #endif
131
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)132 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
133 unsigned char *buf, size_t len, BN_CTX *ctx)
134 {
135 if (group->meth->point2oct == 0
136 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
137 {
138 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
139 return 0;
140 }
141 if (group->meth != point->meth)
142 {
143 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
144 return 0;
145 }
146 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
147 {
148 if (group->meth->field_type == NID_X9_62_prime_field)
149 return ec_GFp_simple_point2oct(group, point,
150 form, buf, len, ctx);
151 else
152 #ifdef OPENSSL_NO_EC2M
153 {
154 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
155 return 0;
156 }
157 #else
158 return ec_GF2m_simple_point2oct(group, point,
159 form, buf, len, ctx);
160 #endif
161 }
162
163 return group->meth->point2oct(group, point, form, buf, len, ctx);
164 }
165
166
EC_POINT_oct2point(const EC_GROUP * group,EC_POINT * point,const unsigned char * buf,size_t len,BN_CTX * ctx)167 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
168 const unsigned char *buf, size_t len, BN_CTX *ctx)
169 {
170 if (group->meth->oct2point == 0
171 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
172 {
173 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
174 return 0;
175 }
176 if (group->meth != point->meth)
177 {
178 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
179 return 0;
180 }
181 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
182 {
183 if (group->meth->field_type == NID_X9_62_prime_field)
184 return ec_GFp_simple_oct2point(group, point,
185 buf, len, ctx);
186 else
187 #ifdef OPENSSL_NO_EC2M
188 {
189 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
190 return 0;
191 }
192 #else
193 return ec_GF2m_simple_oct2point(group, point,
194 buf, len, ctx);
195 #endif
196 }
197 return group->meth->oct2point(group, point, buf, len, ctx);
198 }
199
200