+{
+ int i;
+
+ if (r == NULL)
+ return;
+
+ CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
+ REF_PRINT_COUNT("DH", r);
+ if (i > 0)
+ return;
+ REF_ASSERT_ISNT(i < 0);
+
+ if (r->meth->finish)
+ r->meth->finish(r);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(r->engine);
+#endif
+
+ CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
+
+ CRYPTO_THREAD_lock_free(r->lock);
+
+ BN_clear_free(r->p);
+ BN_clear_free(r->g);
+ BN_clear_free(r->q);
+ BN_clear_free(r->j);
+ OPENSSL_free(r->seed);
+ BN_clear_free(r->counter);
+ BN_clear_free(r->pub_key);
+ BN_clear_free(r->priv_key);
+ OPENSSL_free(r);
+}
+
+int DH_up_ref(DH *r)
+{
+ int i;
+
+ if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
+ return 0;
+
+ REF_PRINT_COUNT("DH", r);
+ REF_ASSERT_ISNT(i < 2);
+ return ((i > 1) ? 1 : 0);
+}
+
+int DH_set_ex_data(DH *d, int idx, void *arg)
+{
+ return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
+}
+
+void *DH_get_ex_data(DH *d, int idx)
+{
+ return (CRYPTO_get_ex_data(&d->ex_data, idx));
+}
+
+int DH_bits(const DH *dh)
+{
+ return BN_num_bits(dh->p);
+}
+
+int DH_size(const DH *dh)
+{
+ return (BN_num_bytes(dh->p));
+}
+
+int DH_security_bits(const DH *dh)
+{
+ int N;
+ if (dh->q)
+ N = BN_num_bits(dh->q);
+ else if (dh->length)
+ N = dh->length;
+ else
+ N = -1;
+ return BN_security_bits(BN_num_bits(dh->p), N);
+}
+
+
+void DH_get0_pqg(const DH *dh, BIGNUM **p, BIGNUM **q, BIGNUM **g)
+{
+ if (p != NULL)
+ *p = dh->p;
+ if (q != NULL)
+ *q = dh->q;
+ if (g != NULL)
+ *g = dh->g;
+}
+
+int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
+{
+ /* 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;
+
+ 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);
+ }
+
+ return 1;
+}
+
+long DH_get_length(const DH *dh)
+{
+ return dh->length;
+}
+
+int DH_set_length(DH *dh, long length)
+{
+ dh->length = length;
+ return 1;
+}
+
+void DH_get0_key(const DH *dh, BIGNUM **pub_key, BIGNUM **priv_key)
+{
+ if (pub_key != NULL)
+ *pub_key = dh->pub_key;
+ if (priv_key != NULL)
+ *priv_key = dh->priv_key;
+}
+
+int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
+{
+ /* 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;
+
+ 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;
+}
+
+void DH_clear_flags(DH *dh, int flags)
+{
+ dh->flags &= ~flags;
+}
+
+int DH_test_flags(const DH *dh, int flags)
+{
+ return dh->flags & flags;
+}
+
+void DH_set_flags(DH *dh, int flags)
+{
+ dh->flags |= flags;
+}
+
+ENGINE *DH_get0_engine(DH *dh)
+{
+ return dh->engine;
+}