text: /*
   * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <openssl/bn.h>
  #include <stdio.h>
  
  #include "dh_locl.h"
  #include "internal/bn_dh.h"
  #include "internal/cryptlib.h"
  
  /*
   * Macro to make a DH structure from BIGNUM data. NB: although just copying
   * the BIGNUM static pointers would be more efficient, we can't do that
   * because they get wiped using BN_clear_free() when DH_free() is called.
   */
  
  #define make_dh(x)                                                             \
      DH* DH_get_##x(void)                                                       \
      {                                                                          \
          DH* dh = DH_new();                                                     \
                                                                                 \
          if (dh == NULL)                                                        \
              return NULL;                                                       \
          dh->p = BN_dup(&_bignum_dh##x##_p);                                    \
          dh->g = BN_dup(&_bignum_dh##x##_g);                                    \
          dh->q = BN_dup(&_bignum_dh##x##_q);                                    \
          if (dh->p == NULL || dh->q == NULL || dh->g == NULL)                   \
          {                                                                      \
              DH_free(dh);                                                       \
              return NULL;                                                       \
          }                                                                      \
          return dh;                                                             \
      }
  
  make_dh(1024_160) make_dh(2048_224) make_dh(2048_256)
  