From 3a2f72b4aad3c2719e4326d30a97e49e26b5d797 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Wed, 26 Jun 2019 15:34:14 +0200
Subject: implement /link signatures

---
 src/include/taler_signatures.h | 46 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

(limited to 'src/include/taler_signatures.h')

diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h
index bff73f737..b738e3156 100644
--- a/src/include/taler_signatures.h
+++ b/src/include/taler_signatures.h
@@ -130,9 +130,9 @@
 #define TALER_SIGNATURE_EXCHANGE_RESERVE_CLOSED 1040
 
 
-/*********************/
-/* Wallet signatures */
-/*********************/
+/**********************/
+/* Auditor signatures */
+/**********************/
 
 /**
  * Signature where the auditor confirms that he is
@@ -209,6 +209,11 @@
  */
 #define TALER_SIGNATURE_WALLET_COIN_PAYBACK 1203
 
+/**
+ * Signature using a coin key authenticating link data.
+ */
+#define TALER_SIGNATURE_WALLET_COIN_LINK 1204
+
 
 /*******************/
 /* Test signatures */
@@ -228,6 +233,41 @@
 
 GNUNET_NETWORK_STRUCT_BEGIN
 
+/**
+ * @brief Format used for to allow the wallet to authenticate
+ * link data provided by the exchange.
+ */
+struct TALER_LinkDataPS
+{
+
+  /**
+   * Purpose must be #TALER_SIGNATURE_WALLET_COIN_LINK.
+   * Used with an EdDSA signature of a `struct TALER_CoinPublicKeyP`.
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+  /**
+   * Hash of the denomination public key of the new coin.
+   */
+  struct GNUNET_HashCode h_denom_pub;
+
+  /**
+   * Public key of the old coin being refreshed.
+   */
+  struct TALER_CoinSpendPublicKeyP old_coin_pub;
+
+  /**
+   * Transfer public key (for which the private key was not revealed)
+   */
+  struct TALER_TransferPublicKeyP transfer_pub;
+
+  /**
+   * Hash of the blinded new coin.
+   */
+  struct GNUNET_HashCode coin_envelope_hash;
+};
+
+
 /**
  * @brief Format used for to generate the signature on a request to withdraw
  * coins from a reserve.
-- 
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