int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
- /* q is optional */
- if (p == NULL || g == NULL)
+ /* If the fields p and g in d are NULL, the corresponding input
+ * parameters MUST be non-NULL. q may remain NULL.
+ *
+ * It is an error to give the results from get0 on d
+ * as input parameters.
+ */
+ if (p == dh->p || (dh->q != NULL && q == dh->q) || g == dh->g)
return 0;
- BN_free(dh->p);
- BN_free(dh->q);
- BN_free(dh->g);
- dh->p = p;
- dh->q = q;
- dh->g = g;
+
+ if (p != NULL) {
+ BN_free(dh->p);
+ dh->p = p;
+ }
+ if (q != NULL) {
+ BN_free(dh->q);
+ dh->q = q;
+ }
+ if (g != NULL) {
+ BN_free(dh->g);
+ dh->g = g;
+ }
if (q != NULL) {
dh->length = BN_num_bits(q);
int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
{
- /* Note that it is valid for priv_key to be NULL */
- if (pub_key == NULL)
+ /* If the pub_key in dh is NULL, the corresponding input
+ * parameters MUST be non-NULL. The priv_key field may
+ * be left NULL.
+ *
+ * It is an error to give the results from get0 on dh
+ * as input parameters.
+ */
+ if (dh->pub_key == pub_key
+ || (dh->priv_key != NULL && priv_key != dh->priv_key))
return 0;
- BN_free(dh->pub_key);
- BN_free(dh->priv_key);
- dh->pub_key = pub_key;
- dh->priv_key = priv_key;
+ if (pub_key != NULL) {
+ BN_free(dh->pub_key);
+ dh->pub_key = pub_key;
+ }
+ if (priv_key != NULL) {
+ BN_free(dh->priv_key);
+ dh->priv_key = priv_key;
+ }
return 1;
}