DH_compute_key_padded
ret = DH_compute_key_padded(key, dhpubbn, dh);
if (DH_compute_key_padded(Z, dhpubbn, dh) <= 0)
OSSL_DEPRECATEDIN_3_0 int DH_compute_key_padded(unsigned char *key,
ret = DH_compute_key_padded(secret, pub_key, pdhctx->dh);