make code build against revised GNUnet blind signing API

2 files changed, 42 insertions, 13 deletions

diff --git a/src/exchange-lib/exchange_api_refresh.c b/src/exchange-lib/exchange_api_refresh.c
index b86e58362..8331f5e78 100644
--- a/src/exchange-lib/exchange_api_refresh.c
+++ b/src/exchange-lib/exchange_api_refresh.c
@@ -851,10 +851,18 @@ TALER_EXCHANGE_refresh_prepare (const struct TALER_CoinSpendPrivateKeyP *melt_pr
       GNUNET_CRYPTO_hash (&coin_pub.eddsa_pub,
                           sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
                           &coin_hash);
-      coin_ev_size = GNUNET_CRYPTO_rsa_blind (&coin_hash,
-                                              &fc->blinding_key.bks,
-                                              md.fresh_pks[j].rsa_public_key,
-                                              &coin_ev);
+      if (GNUNET_YES !=
+          GNUNET_CRYPTO_rsa_blind (&coin_hash,
+                                   &fc->blinding_key.bks,
+                                   md.fresh_pks[j].rsa_public_key,
+                                   &coin_ev,
+                                   &coin_ev_size))
+      {
+        GNUNET_break_op (0);
+        GNUNET_CRYPTO_hash_context_abort (hash_context);
+        free_melt_data (&md);
+        return NULL;
+      }
       GNUNET_CRYPTO_hash_context_read (hash_context,
                                        coin_ev,
                                        coin_ev_size);
@@ -1378,10 +1386,24 @@ TALER_EXCHANGE_refresh_melt (struct TALER_EXCHANGE_Handle *exchange,
       GNUNET_CRYPTO_hash (&coin_pub.eddsa_pub,
                           sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
                           &coin_hash);
-      coin_ev_size = GNUNET_CRYPTO_rsa_blind (&coin_hash,
-                                              &fc->blinding_key.bks,
-                                              md->fresh_pks[i].rsa_public_key,
-                                              &coin_ev);
+      if (GNUNET_YES !=
+          GNUNET_CRYPTO_rsa_blind (&coin_hash,
+                                   &fc->blinding_key.bks,
+                                   md->fresh_pks[i].rsa_public_key,
+                                   &coin_ev,
+                                   &coin_ev_size))
+      {
+        /* This should have been noticed during the preparation stage. */
+        GNUNET_break (0);
+        json_decref (new_denoms);
+        json_decref (tmp);
+        json_decref (coin_evs);
+        json_decref (melt_coin);
+        json_decref (transfer_pubs);
+        json_decref (secret_encs);
+        json_decref (link_encs);
+        return NULL;
+      }
       json_array_append (tmp,
                          GNUNET_JSON_from_data (coin_ev,
                                                 coin_ev_size));
diff --git a/src/exchange-lib/exchange_api_reserve.c b/src/exchange-lib/exchange_api_reserve.c
index 82e602a46..2b07223af 100644
--- a/src/exchange-lib/exchange_api_reserve.c
+++ b/src/exchange-lib/exchange_api_reserve.c
@@ -784,7 +784,7 @@ handle_reserve_withdraw_finished (void *cls,
  *        caller must have committed this value to disk before the call (with @a pk)
  * @param res_cb the callback to call when the final result for this request is available
  * @param res_cb_cls closure for the above callback
- * @return #GNUNET_OK on success, #GNUNET_SYSERR
+ * @return handle for the operation on success, NULL on error, i.e.
  *         if the inputs are invalid (i.e. denomination key not with this exchange).
  *         In this case, the callback is not called.
  */
@@ -819,10 +819,17 @@ TALER_EXCHANGE_reserve_withdraw (struct TALER_EXCHANGE_Handle *exchange,
   GNUNET_CRYPTO_hash (&coin_pub.eddsa_pub,
                       sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
                       &wsh->c_hash);
-  coin_ev_size = GNUNET_CRYPTO_rsa_blind (&wsh->c_hash,
-                                          &blinding_key->bks,
-                                          pk->key.rsa_public_key,
-                                          &coin_ev);
+  if (GNUNET_YES !=
+      GNUNET_CRYPTO_rsa_blind (&wsh->c_hash,
+                               &blinding_key->bks,
+                               pk->key.rsa_public_key,
+                               &coin_ev,
+                               &coin_ev_size))
+  {
+    GNUNET_break_op (0);
+    GNUNET_free (wsh);
+    return NULL;
+  }
   GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
                                       &wsh->reserve_pub.eddsa_pub);
   req.purpose.size = htonl (sizeof (struct TALER_WithdrawRequestPS));