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[openssl.git] / crypto / ec / ec_oct.c
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
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
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
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
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