From f6ecb6c895879ee4b5db3061593feaad3456d1c8 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sat, 25 Dec 2021 15:39:01 +0100
Subject: -eliminate redundant hash operation on link signatures

---
 src/include/taler_crypto_lib.h        |  6 ++----
 src/include/taler_exchangedb_plugin.h | 16 +++++++++++-----
 2 files changed, 13 insertions(+), 9 deletions(-)

(limited to 'src/include')

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index db38c0c22..e6c5e2a4d 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -1788,8 +1788,7 @@ TALER_wallet_link_sign (const struct TALER_DenominationHash *h_denom_pub,
  *
  * @param h_denom_pub hash of the denomiantion public key of the new coin
  * @param transfer_pub transfer public key
- * @param coin_ev coin envelope
- * @param coin_ev_size number of bytes in @a coin_ev
+ * @param h_coin_ev hash of the coin envelope
  * @param old_coin_pub old coin key that the link signature is for
  * @param coin_sig resulting signature
  * @return #GNUNET_OK if the signature is valid
@@ -1798,8 +1797,7 @@ enum GNUNET_GenericReturnValue
 TALER_wallet_link_verify (
   const struct TALER_DenominationHash *h_denom_pub,
   const struct TALER_TransferPublicKeyP *transfer_pub,
-  const void *coin_ev,
-  size_t coin_ev_size,
+  const struct TALER_BlindedCoinHash *h_coin_ev,
   const struct TALER_CoinSpendPublicKeyP *old_coin_pub,
   const struct TALER_CoinSpendSignatureP *coin_sig);
 
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 357d9f073..3c7840ef0 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1635,6 +1635,16 @@ struct TALER_EXCHANGEDB_RefreshRevealedCoin
    */
   struct TALER_CoinSpendSignatureP orig_coin_link_sig;
 
+  /**
+   * Hash of the blinded new coin, that is @e coin_ev.
+   */
+  struct TALER_BlindedCoinHash coin_envelope_hash;
+
+  /**
+   * Signature generated by the exchange over the coin (in blinded format).
+   */
+  struct TALER_BlindedDenominationSignature coin_sig;
+
   /**
    * Blinded message to be signed (in envelope), with @e coin_env_size bytes.
    */
@@ -1645,10 +1655,6 @@ struct TALER_EXCHANGEDB_RefreshRevealedCoin
    */
   size_t coin_ev_size;
 
-  /**
-   * Signature generated by the exchange over the coin (in blinded format).
-   */
-  struct TALER_BlindedDenominationSignature coin_sig;
 };
 
 
@@ -2972,7 +2978,7 @@ struct TALER_EXCHANGEDB_Plugin
 
 
   /**
-   * Lookup in the database for the @a num_freshcoins coins that we
+   * Lookup in the database for the fresh coins that we
    * created in the given refresh operation.
    *
    * @param cls the @e cls of this struct with the plugin-specific state
-- 
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