text: #include <openssl/ecdsa.h>
  #include <openssl/objects.h>
  int main()
  {
          EC_KEY *ec256, *ec384, *ec521;
  
          ec256 = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
          ec384 = EC_KEY_new_by_curve_name(NID_secp384r1);
          ec521 = EC_KEY_new_by_curve_name(NID_secp521r1);
          if (ec256 == NULL || ec384 == NULL || ec521 == NULL)
                  return 1;
          return 0;
  }
  