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 Apache License 2.0 (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_local.h"
17
18int 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#ifndef OPENSSL_NO_DEPRECATED_3_0
53int 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
61int 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
70size_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
101int 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
129size_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}
151