xref: /openssl/crypto/ec/ec_deprecated.c (revision e077455e)
1 /*
2  * Copyright 2002-2020 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
EC_POINT_point2bn(const EC_GROUP * group,const EC_POINT * point,point_conversion_form_t form,BIGNUM * ret,BN_CTX * ctx)21 BIGNUM *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 
EC_POINT_bn2point(const EC_GROUP * group,const BIGNUM * bn,EC_POINT * point,BN_CTX * ctx)41 EC_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         return NULL;
52 
53     if (BN_bn2binpad(bn, buf, buf_len) < 0) {
54         OPENSSL_free(buf);
55         return NULL;
56     }
57 
58     if (point == NULL) {
59         if ((ret = EC_POINT_new(group)) == NULL) {
60             OPENSSL_free(buf);
61             return NULL;
62         }
63     } else
64         ret = point;
65 
66     if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
67         if (ret != point)
68             EC_POINT_clear_free(ret);
69         OPENSSL_free(buf);
70         return NULL;
71     }
72 
73     OPENSSL_free(buf);
74     return ret;
75 }
76 #endif /* OPENSSL_NO_DEPRECATED_3_0 */
77