crypto/ec/ec_deprecated.c

   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
  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
  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         ECerr(EC_F_EC_POINT_BN2POINT, ERR_R_MALLOC_FAILURE);
  52         return NULL;
  53     }
  54
  55     if (!BN_bn2binpad(bn, buf, buf_len)) {
  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 */