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Other example for DH and ECC from:
https://github.com/bumptech/stud/blob/master/stud.c
#ifndef OPENSSL_NO_DH
static int init_dh(SSL_CTX *ctx, const char *cert) {
 DH *dh;
 BIO *bio;
 assert(cert);
 bio = BIO_new_file(cert, "r");
 if (!bio) {
 ERR_print_errors_fp(stderr);
 return -1;
 }
 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 BIO_free(bio);
 if (!dh) {
 ERR("{core} Note: no DH parameters found in %s\n", cert);
 return -1;
 }
 LOG("{core} Using DH parameters from %s\n", cert);
 SSL_CTX_set_tmp_dh(ctx, dh);
 LOG("{core} DH initialized with %d bit key\n", 8*DH_size(dh));
 DH_free(dh);
#ifdef NID_X9_62_prime256v1
 EC_KEY *ecdh = NULL;
 ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
 SSL_CTX_set_tmp_ecdh(ctx,ecdh);
 EC_KEY_free(ecdh);
 LOG("{core} ECDH Initialized with NIST P-256\n");
#endif
 return 0;
}
#endif /* OPENSSL_NO_DH */