Android build: fix usage of NDK home variable ($ndk_var)
[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 #if OPENSSL_API_COMPAT < 0x10200000L
53 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
54                                             EC_POINT *point, const BIGNUM *x,
55                                             int y_bit, BN_CTX *ctx)
56 {
57     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
58 }
59
60 # ifndef OPENSSL_NO_EC2M
61 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
62                                              EC_POINT *point, const BIGNUM *x,
63                                              int y_bit, BN_CTX *ctx)
64 {
65     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
66 }
67 # endif
68 #endif
69
70 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
71                           point_conversion_form_t form, unsigned char *buf,
72                           size_t len, BN_CTX *ctx)
73 {
74     if (group->meth->point2oct == 0
75         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
76         ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
77         return 0;
78     }
79     if (!ec_point_is_compat(point, group)) {
80         ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
81         return 0;
82     }
83     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
84         if (group->meth->field_type == NID_X9_62_prime_field)
85             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
86         else
87 #ifdef OPENSSL_NO_EC2M
88         {
89             ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
90             return 0;
91         }
92 #else
93             return ec_GF2m_simple_point2oct(group, point,
94                                             form, buf, len, ctx);
95 #endif
96     }
97
98     return group->meth->point2oct(group, point, form, buf, len, ctx);
99 }
100
101 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
102                        const unsigned char *buf, size_t len, BN_CTX *ctx)
103 {
104     if (group->meth->oct2point == 0
105         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
106         ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
107         return 0;
108     }
109     if (!ec_point_is_compat(point, group)) {
110         ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
111         return 0;
112     }
113     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
114         if (group->meth->field_type == NID_X9_62_prime_field)
115             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
116         else
117 #ifdef OPENSSL_NO_EC2M
118         {
119             ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
120             return 0;
121         }
122 #else
123             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
124 #endif
125     }
126     return group->meth->oct2point(group, point, buf, len, ctx);
127 }
128
129 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
130                           point_conversion_form_t form,
131                           unsigned char **pbuf, BN_CTX *ctx)
132 {
133     size_t len;
134     unsigned char *buf;
135
136     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
137     if (len == 0)
138         return 0;
139     if ((buf = OPENSSL_malloc(len)) == NULL) {
140         ECerr(EC_F_EC_POINT_POINT2BUF, ERR_R_MALLOC_FAILURE);
141         return 0;
142     }
143     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
144     if (len == 0) {
145         OPENSSL_free(buf);
146         return 0;
147     }
148     *pbuf = buf;
149     return len;
150 }