DH_get0_priv_key
const BIGNUM *DH_get0_priv_key(const DH *dh);
LCRYPTO_ALIAS(DH_get0_priv_key);
LCRYPTO_USED(DH_get0_priv_key);
if (!BN_print_fp(stdout, DH_get0_priv_key(dh)))