DH_set0_pqg
DH_set0_pqg(dh, p, NULL, g);
DH_set0_pqg(dh_server, BN_dup(p), BN_dup(g), BN_dup(q));
DH_set0_pqg(dh, params->p, params->q, params->g);
DH_set0_pqg(dh, p, q, g);
int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);