From ca66a1d1af2412e3ad04c18150db7a259dc69b5e Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 10 Jan 2021 00:54:12 +0100
Subject: fix major bug with SQL statement missing ORDER BY freshcoin_index
 resulting in possible link failures (but usually lucky with old DB schema)

---
 src/include/taler_crypto_lib.h        | 41 +++++++++++++++++++++++++++++++++++
 src/include/taler_exchangedb_plugin.h |  1 +
 2 files changed, 42 insertions(+)

(limited to 'src/include')

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 70e49697c..4ea845b49 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -1050,6 +1050,47 @@ TALER_CRYPTO_helper_esign_disconnect (
   struct TALER_CRYPTO_ExchangeSignHelper *esh);
 
 
+/* ********************* wallet signing ************************** */
+
+/**
+ * Sign link data.
+ *
+ * @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 old_coin_priv private key to sign with
+ * @param[out] coin_sig resulting signature
+ */
+void
+TALER_wallet_link_sign (const struct GNUNET_HashCode *h_denom_pub,
+                        const struct TALER_TransferPublicKeyP *transfer_pub,
+                        const void *coin_ev,
+                        size_t coin_ev_size,
+                        const struct TALER_CoinSpendPrivateKeyP *old_coin_priv,
+                        struct TALER_CoinSpendSignatureP *coin_sig);
+
+
+/**
+ * Verify link signature.
+ *
+ * @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 old_coin_priv private key to sign with
+ * @param coin_sig resulting signature
+ * @return #GNUNET_OK if the signature is valid
+ */
+enum GNUNET_GenericReturnValue
+TALER_wallet_link_verify (
+  const struct GNUNET_HashCode *h_denom_pub,
+  const struct TALER_TransferPublicKeyP *transfer_pub,
+  const void *coin_ev,
+  size_t coin_ev_size,
+  const struct TALER_CoinSpendPublicKeyP *old_coin_pub,
+  const struct TALER_CoinSpendSignatureP *coin_sig);
+
 /* ********************* offline signing ************************** */
 
 
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 83d283401..da320d39c 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1274,6 +1274,7 @@ struct TALER_EXCHANGEDB_LinkList
    * link data, of type #TALER_SIGNATURE_WALLET_COIN_LINK
    */
   struct TALER_CoinSpendSignatureP orig_coin_link_sig;
+
 };
 
 
-- 
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