From 70b08396445c7d9f709ad020a608acbf812433bd Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 6 Dec 2020 00:05:45 +0100
Subject: implement new taler-auditor-offline tool

---
 src/util/auditor_signatures.c | 122 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 src/util/auditor_signatures.c

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

diff --git a/src/util/auditor_signatures.c b/src/util/auditor_signatures.c
new file mode 100644
index 000000000..837b31c6c
--- /dev/null
+++ b/src/util/auditor_signatures.c
@@ -0,0 +1,122 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file auditor_signatures.c
+ * @brief Utility functions for Taler auditor signatures
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_util.h"
+#include "taler_signatures.h"
+
+
+void
+TALER_auditor_denom_validity_sign (
+  const char *auditor_url,
+  const struct GNUNET_HashCode *h_denom_pub,
+  const struct TALER_MasterPublicKeyP *master_pub,
+  struct GNUNET_TIME_Absolute stamp_start,
+  struct GNUNET_TIME_Absolute stamp_expire_withdraw,
+  struct GNUNET_TIME_Absolute stamp_expire_deposit,
+  struct GNUNET_TIME_Absolute stamp_expire_legal,
+  const struct TALER_Amount *coin_value,
+  const struct TALER_Amount *fee_withdraw,
+  const struct TALER_Amount *fee_deposit,
+  const struct TALER_Amount *fee_refresh,
+  const struct TALER_Amount *fee_refund,
+  const struct TALER_AuditorPrivateKeyP *auditor_priv,
+  struct TALER_AuditorSignatureP *auditor_sig)
+{
+  struct TALER_ExchangeKeyValidityPS kv = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS),
+    .purpose.size = htonl (sizeof (kv)),
+    .start = GNUNET_TIME_absolute_hton (stamp_start),
+    .expire_withdraw = GNUNET_TIME_absolute_hton (stamp_expire_withdraw),
+    .expire_deposit = GNUNET_TIME_absolute_hton (stamp_expire_deposit),
+    .expire_legal = GNUNET_TIME_absolute_hton (stamp_expire_legal),
+    .denom_hash = *h_denom_pub,
+    .master = *master_pub,
+  };
+
+  TALER_amount_hton (&kv.value,
+                     coin_value);
+  TALER_amount_hton (&kv.fee_withdraw,
+                     fee_withdraw);
+  TALER_amount_hton (&kv.fee_deposit,
+                     fee_deposit);
+  TALER_amount_hton (&kv.fee_refresh,
+                     fee_refresh);
+  TALER_amount_hton (&kv.fee_refund,
+                     fee_refund);
+  GNUNET_CRYPTO_hash (auditor_url,
+                      strlen (auditor_url) + 1,
+                      &kv.auditor_url_hash);
+  GNUNET_CRYPTO_eddsa_sign (&auditor_priv->eddsa_priv,
+                            &kv,
+                            &auditor_sig->eddsa_sig);
+}
+
+
+int
+TALER_auditor_denom_validity_verify (
+  const char *auditor_url,
+  const struct GNUNET_HashCode *h_denom_pub,
+  const struct TALER_MasterPublicKeyP *master_pub,
+  struct GNUNET_TIME_Absolute stamp_start,
+  struct GNUNET_TIME_Absolute stamp_expire_withdraw,
+  struct GNUNET_TIME_Absolute stamp_expire_deposit,
+  struct GNUNET_TIME_Absolute stamp_expire_legal,
+  const struct TALER_Amount *coin_value,
+  const struct TALER_Amount *fee_withdraw,
+  const struct TALER_Amount *fee_deposit,
+  const struct TALER_Amount *fee_refresh,
+  const struct TALER_Amount *fee_refund,
+  const struct TALER_AuditorPublicKeyP *auditor_pub,
+  const struct TALER_AuditorSignatureP *auditor_sig)
+{
+  struct TALER_ExchangeKeyValidityPS kv = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS),
+    .purpose.size = htonl (sizeof (kv)),
+    .start = GNUNET_TIME_absolute_hton (stamp_start),
+    .expire_withdraw = GNUNET_TIME_absolute_hton (stamp_expire_withdraw),
+    .expire_deposit = GNUNET_TIME_absolute_hton (stamp_expire_deposit),
+    .expire_legal = GNUNET_TIME_absolute_hton (stamp_expire_legal),
+    .denom_hash = *h_denom_pub,
+    .master = *master_pub,
+  };
+
+  TALER_amount_hton (&kv.value,
+                     coin_value);
+  TALER_amount_hton (&kv.fee_withdraw,
+                     fee_withdraw);
+  TALER_amount_hton (&kv.fee_deposit,
+                     fee_deposit);
+  TALER_amount_hton (&kv.fee_refresh,
+                     fee_refresh);
+  TALER_amount_hton (&kv.fee_refund,
+                     fee_refund);
+  GNUNET_CRYPTO_hash (auditor_url,
+                      strlen (auditor_url) + 1,
+                      &kv.auditor_url_hash);
+  return
+    GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS,
+                                &kv,
+                                &auditor_sig->eddsa_sig,
+                                &auditor_pub->eddsa_pub);
+}
+
+
+/* end of auditor_signatures.c */
-- 
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