From 2c14d338704f4574055c4b5c51d8a79dd2e22345 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Tue, 21 Dec 2021 16:16:10 +0100
Subject: deduplicate melt signing logic, remove coin_pub from data being
 signed over

---
 src/util/wallet_signatures.c | 54 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'src/util/wallet_signatures.c')

diff --git a/src/util/wallet_signatures.c b/src/util/wallet_signatures.c
index 81ce9cc5f..f686b765c 100644
--- a/src/util/wallet_signatures.c
+++ b/src/util/wallet_signatures.c
@@ -202,4 +202,58 @@ TALER_wallet_recoup_sign (
 }
 
 
+void
+TALER_wallet_melt_sign (
+  const struct TALER_Amount *amount_with_fee,
+  const struct TALER_Amount *melt_fee,
+  const struct TALER_RefreshCommitmentP *rc,
+  const struct TALER_DenominationHash *h_denom_pub,
+  const struct TALER_CoinSpendPrivateKeyP *coin_priv,
+  struct TALER_CoinSpendSignatureP *coin_sig)
+{
+  struct TALER_RefreshMeltCoinAffirmationPS melt = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_MELT),
+    .purpose.size = htonl (sizeof (melt)),
+    .rc = *rc,
+    .h_denom_pub = *h_denom_pub
+  };
+
+  TALER_amount_hton (&melt.amount_with_fee,
+                     amount_with_fee);
+  TALER_amount_hton (&melt.melt_fee,
+                     melt_fee);
+  GNUNET_CRYPTO_eddsa_sign (&coin_priv->eddsa_priv,
+                            &melt,
+                            &coin_sig->eddsa_signature);
+}
+
+
+enum GNUNET_GenericReturnValue
+TALER_wallet_melt_verify (
+  const struct TALER_Amount *amount_with_fee,
+  const struct TALER_Amount *melt_fee,
+  const struct TALER_RefreshCommitmentP *rc,
+  const struct TALER_DenominationHash *h_denom_pub,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_CoinSpendSignatureP *coin_sig)
+{
+  struct TALER_RefreshMeltCoinAffirmationPS melt = {
+    .purpose.size = htonl (sizeof (melt)),
+    .purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_MELT),
+    .rc = *rc,
+    .h_denom_pub = *h_denom_pub
+  };
+
+  TALER_amount_hton (&melt.amount_with_fee,
+                     amount_with_fee);
+  TALER_amount_hton (&melt.melt_fee,
+                     melt_fee);
+  return GNUNET_CRYPTO_eddsa_verify (
+    TALER_SIGNATURE_WALLET_COIN_MELT,
+    &melt,
+    &coin_sig->eddsa_signature,
+    &coin_pub->eddsa_pub);
+}
+
+
 /* end of wallet_signatures.c */
-- 
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