replace denom_pub with denom_pub_hash in exchange API to reduce bandwidth

2 files changed, 11 insertions, 8 deletions

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index f12516177..18c214e19 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -354,10 +354,10 @@ struct TALER_CoinPublicInfo
   struct TALER_CoinSpendPublicKeyP coin_pub;
 
   /**
-   * Public key representing the denomination of the coin
-   * that is being deposited.
+   * Hash of the public key representing the denomination of the coin that is
+   * being deposited.
    */
-  struct TALER_DenominationPublicKey denom_pub;
+  struct GNUNET_HashCode denom_pub_hash;
 
   /**
    * (Unblinded) signature over @e coin_pub with @e denom_pub,
@@ -401,12 +401,14 @@ struct TALER_TrackTransferDetails
  * is not expired, and the signature is correct.
  *
  * @param coin_public_info the coin public info to check for validity
+ * @param denom_pub denomination key, must match @a coin_public_info's `denom_pub_hash`
  * @return #GNUNET_YES if the coin is valid,
  *         #GNUNET_NO if it is invalid
  *         #GNUNET_SYSERR if an internal error occured
  */
 int
-TALER_test_coin_valid (const struct TALER_CoinPublicInfo *coin_public_info);
+TALER_test_coin_valid (const struct TALER_CoinPublicInfo *coin_public_info,
+                       const struct TALER_DenominationPublicKey *denom_pub);
 
 
 GNUNET_NETWORK_STRUCT_BEGIN
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 2d9f14208..0a46c7264 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -147,9 +147,9 @@ struct TALER_EXCHANGEDB_CollectableBlindcoin
   struct TALER_DenominationSignature sig;
 
   /**
-   * Denomination key (which coin was generated).
+   * Hash of the denomination key (which coin was generated).
    */
-  struct TALER_DenominationPublicKey denom_pub;
+  struct GNUNET_HashCode denom_pub_hash;
 
   /**
    * Value of the coin being exchangeed (matching the denomination key)
@@ -1045,6 +1045,7 @@ typedef int
                                     const struct TALER_Amount *amount,
                                     const struct TALER_ReservePublicKeyP *reserve_pub,
                                     const struct TALER_CoinPublicInfo *coin,
+                                    const struct TALER_DenominationPublicKey *denom_pub,
                                     const struct TALER_CoinSpendSignatureP *coin_sig,
                                     const struct TALER_DenominationBlindingKeyP *coin_blind);
 
@@ -1274,14 +1275,14 @@ struct TALER_EXCHANGEDB_Plugin
    *
    * @param cls the @e cls of this struct with the plugin-specific state
    * @param session connection to use
-   * @param denom_pub the public key used for signing coins of this denomination
+   * @param denom_pub_hash hash of the public key used for signing coins of this denomination
    * @param[out] issue set to issue information with value, fees and other info about the coin
    * @return transaction status code
    */
   enum GNUNET_DB_QueryStatus
   (*get_denomination_info) (void *cls,
                             struct TALER_EXCHANGEDB_Session *session,
-                            const struct TALER_DenominationPublicKey *denom_pub,
+                            const struct GNUNET_HashCode *denom_pub_hash,
                             struct TALER_EXCHANGEDB_DenominationKeyInformationP *issue);