1/*
2 * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * Suppress deprecation warnings for EC low level implementations that are
12 * kept until removal.
13 */
14#define OPENSSL_SUPPRESS_DEPRECATED
15
16#include <openssl/crypto.h>
17#include <openssl/err.h>
18#include <openssl/ec.h>
19
20#ifndef OPENSSL_NO_DEPRECATED_3_0
21BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
22                          const EC_POINT *point,
23                          point_conversion_form_t form,
24                          BIGNUM *ret, BN_CTX *ctx)
25{
26    size_t buf_len = 0;
27    unsigned char *buf;
28
29    buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
30
31    if (buf_len == 0)
32        return NULL;
33
34    ret = BN_bin2bn(buf, buf_len, ret);
35
36    OPENSSL_free(buf);
37
38    return ret;
39}
40
41EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
42                            const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
43{
44    size_t buf_len = 0;
45    unsigned char *buf;
46    EC_POINT *ret;
47
48    if ((buf_len = BN_num_bytes(bn)) == 0)
49        buf_len = 1;
50    if ((buf = OPENSSL_malloc(buf_len)) == NULL) {
51        ECerr(EC_F_EC_POINT_BN2POINT, ERR_R_MALLOC_FAILURE);
52        return NULL;
53    }
54
55    if (BN_bn2binpad(bn, buf, buf_len) < 0) {
56        OPENSSL_free(buf);
57        return NULL;
58    }
59
60    if (point == NULL) {
61        if ((ret = EC_POINT_new(group)) == NULL) {
62            OPENSSL_free(buf);
63            return NULL;
64        }
65    } else
66        ret = point;
67
68    if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
69        if (ret != point)
70            EC_POINT_clear_free(ret);
71        OPENSSL_free(buf);
72        return NULL;
73    }
74
75    OPENSSL_free(buf);
76    return ret;
77}
78#endif /* OPENSSL_NO_DEPRECATED_3_0 */
79