add missing file

1 files changed, 69 insertions, 0 deletions

diff --git a/src/util/exchange_signatures.c b/src/util/exchange_signatures.c
new file mode 100644
index 000000000..2e71a33c1
--- /dev/null
+++ b/src/util/exchange_signatures.c
@@ -0,0 +1,69 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2021 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 exchange_signatures.c
+ * @brief Utility functions for Taler security module signatures
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_util.h"
+#include "taler_signatures.h"
+
+
+enum GNUNET_GenericReturnValue
+TALER_exchange_deposit_confirm_verify (
+  const struct TALER_PrivateContractHash *h_contract_terms,
+  const struct TALER_MerchantWireHash *h_wire,
+  const struct TALER_ExtensionContractHash *h_extensions,
+  struct GNUNET_TIME_Absolute exchange_timestamp,
+  struct GNUNET_TIME_Absolute wire_deadline,
+  struct GNUNET_TIME_Absolute refund_deadline,
+  const struct TALER_Amount *amount_without_fee,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_MerchantPublicKeyP *merchant_pub,
+  const struct TALER_ExchangePublicKeyP *exchange_pub,
+  const struct TALER_ExchangeSignatureP *exchange_sig)
+{
+  struct TALER_DepositConfirmationPS dcs = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT),
+    .purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS)),
+    .h_contract_terms = *h_contract_terms,
+    .h_wire = *h_wire,
+    .exchange_timestamp = GNUNET_TIME_absolute_hton (exchange_timestamp),
+    .wire_deadline = GNUNET_TIME_absolute_hton (wire_deadline),
+    .refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline),
+    .coin_pub = *coin_pub,
+    .merchant_pub = *merchant_pub
+  };
+
+  if (NULL != h_extensions)
+    dcs.h_extensions = *h_extensions;
+  TALER_amount_hton (&dcs.amount_without_fee,
+                     amount_without_fee);
+  if (GNUNET_OK !=
+      GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
+                                  &dcs,
+                                  &exchange_sig->eddsa_signature,
+                                  &exchange_pub->eddsa_pub))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
+/* end of exchange_signatures.c */