Provide EC functions that are not curve type specific
[openssl.git] / crypto / ec / ec_oct.c
1 /*
2  * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4  *
5  * Licensed under the OpenSSL license (the "License").  You may not use
6  * this file except in compliance with the License.  You can obtain a copy
7  * in the file LICENSE in the source distribution or at
8  * https://www.openssl.org/source/license.html
9  */
10
11 #include <string.h>
12
13 #include <openssl/err.h>
14 #include <openssl/opensslv.h>
15
16 #include "ec_lcl.h"
17
18 int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point,
19                                         const BIGNUM *x, int y_bit, BN_CTX *ctx)
20 {
21     if (group->meth->point_set_compressed_coordinates == NULL
22         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
23         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
24               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
25         return 0;
26     }
27     if (!ec_point_is_compat(point, group)) {
28         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
29               EC_R_INCOMPATIBLE_OBJECTS);
30         return 0;
31     }
32     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
33         if (group->meth->field_type == NID_X9_62_prime_field)
34             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
35                                                             y_bit, ctx);
36         else
37 #ifdef OPENSSL_NO_EC2M
38         {
39             ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
40                   EC_R_GF2M_NOT_SUPPORTED);
41             return 0;
42         }
43 #else
44             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
45                                                              y_bit, ctx);
46 #endif
47     }
48     return group->meth->point_set_compressed_coordinates(group, point, x,
49                                                          y_bit, ctx);
50 }
51
52 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
53                                             EC_POINT *point, const BIGNUM *x,
54                                             int y_bit, BN_CTX *ctx)
55 {
56     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
57 }
58
59 #ifndef OPENSSL_NO_EC2M
60 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
61                                              EC_POINT *point, const BIGNUM *x,
62                                              int y_bit, BN_CTX *ctx)
63 {
64     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
65 }
66 #endif
67
68 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
69                           point_conversion_form_t form, unsigned char *buf,
70                           size_t len, BN_CTX *ctx)
71 {
72     if (group->meth->point2oct == 0
73         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
74         ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
75         return 0;
76     }
77     if (!ec_point_is_compat(point, group)) {
78         ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
79         return 0;
80     }
81     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
82         if (group->meth->field_type == NID_X9_62_prime_field)
83             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
84         else
85 #ifdef OPENSSL_NO_EC2M
86         {
87             ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
88             return 0;
89         }
90 #else
91             return ec_GF2m_simple_point2oct(group, point,
92                                             form, buf, len, ctx);
93 #endif
94     }
95
96     return group->meth->point2oct(group, point, form, buf, len, ctx);
97 }
98
99 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
100                        const unsigned char *buf, size_t len, BN_CTX *ctx)
101 {
102     if (group->meth->oct2point == 0
103         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
104         ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
105         return 0;
106     }
107     if (!ec_point_is_compat(point, group)) {
108         ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
109         return 0;
110     }
111     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
112         if (group->meth->field_type == NID_X9_62_prime_field)
113             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
114         else
115 #ifdef OPENSSL_NO_EC2M
116         {
117             ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
118             return 0;
119         }
120 #else
121             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
122 #endif
123     }
124     return group->meth->oct2point(group, point, buf, len, ctx);
125 }
126
127 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
128                           point_conversion_form_t form,
129                           unsigned char **pbuf, BN_CTX *ctx)
130 {
131     size_t len;
132     unsigned char *buf;
133
134     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
135     if (len == 0)
136         return 0;
137     if ((buf = OPENSSL_malloc(len)) == NULL) {
138         ECerr(EC_F_EC_POINT_POINT2BUF, ERR_R_MALLOC_FAILURE);
139         return 0;
140     }
141     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
142     if (len == 0) {
143         OPENSSL_free(buf);
144         return 0;
145     }
146     *pbuf = buf;
147     return len;
148 }